1 /****************************************************************************
2 * RRDtool 1.2rc6 Copyright by Tobi Oetiker, 1997-2005
3 ****************************************************************************
4 * rrd__graph.c produce graphs from data in rrdfiles
5 ****************************************************************************/
12 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
25 #include "rrd_graph.h"
27 /* some constant definitions */
31 #ifndef RRD_DEFAULT_FONT
32 /* there is special code later to pick Cour.ttf when running on windows */
33 #define RRD_DEFAULT_FONT "VeraMono.ttf"
36 text_prop_t text_prop[] = {
37 { 9.0, RRD_DEFAULT_FONT }, /* default */
38 { 11.0, RRD_DEFAULT_FONT }, /* title */
39 { 8.0, RRD_DEFAULT_FONT }, /* axis */
40 { 9.0, RRD_DEFAULT_FONT }, /* unit */
41 { 9.0, RRD_DEFAULT_FONT } /* legend */
45 {0, TMT_SECOND,30, TMT_MINUTE,5, TMT_MINUTE,5, 0,"%H:%M"},
46 {2, TMT_MINUTE,1, TMT_MINUTE,5, TMT_MINUTE,5, 0,"%H:%M"},
47 {5, TMT_MINUTE,2, TMT_MINUTE,10, TMT_MINUTE,10, 0,"%H:%M"},
48 {10, TMT_MINUTE,5, TMT_MINUTE,20, TMT_MINUTE,20, 0,"%H:%M"},
49 {30, TMT_MINUTE,10, TMT_HOUR,1, TMT_HOUR,1, 0,"%H:%M"},
50 {60, TMT_MINUTE,30, TMT_HOUR,2, TMT_HOUR,2, 0,"%H:%M"},
51 {180, TMT_HOUR,1, TMT_HOUR,6, TMT_HOUR,6, 0,"%H:%M"},
52 /*{300, TMT_HOUR,3, TMT_HOUR,12, TMT_HOUR,12, 12*3600,"%a %p"}, this looks silly*/
53 {600, TMT_HOUR,6, TMT_DAY,1, TMT_DAY,1, 24*3600,"%a"},
54 {1800, TMT_HOUR,12, TMT_DAY,1, TMT_DAY,2, 24*3600,"%a"},
55 {3600, TMT_DAY,1, TMT_WEEK,1, TMT_WEEK,1, 7*24*3600,"Week %V"},
56 {3*3600, TMT_WEEK,1, TMT_MONTH,1, TMT_WEEK,2, 7*24*3600,"Week %V"},
57 {6*3600, TMT_MONTH,1, TMT_MONTH,1, TMT_MONTH,1, 30*24*3600,"%b"},
58 {48*3600, TMT_MONTH,1, TMT_MONTH,3, TMT_MONTH,3, 30*24*3600,"%b"},
59 {10*24*3600, TMT_YEAR,1, TMT_YEAR,1, TMT_YEAR,1, 365*24*3600,"%y"},
60 {-1,TMT_MONTH,0,TMT_MONTH,0,TMT_MONTH,0,0,""}
63 /* sensible logarithmic y label intervals ...
64 the first element of each row defines the possible starting points on the
65 y axis ... the other specify the */
67 double yloglab[][12]= {{ 1e9, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
68 { 1e3, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
69 { 1e1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
70 /* { 1e1, 1, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, */
71 { 1e1, 1, 2.5, 5, 7.5, 0, 0, 0, 0, 0, 0, 0 },
72 { 1e1, 1, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0 },
73 { 1e1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0 },
74 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }};
76 /* sensible y label intervals ...*/
94 gfx_color_t graph_col[] = /* default colors */
95 { 0xFFFFFFFF, /* canvas */
96 0xF0F0F0FF, /* background */
97 0xD0D0D0FF, /* shade A */
98 0xA0A0A0FF, /* shade B */
99 0x90909080, /* grid */
100 0xE0505080, /* major grid */
101 0x000000FF, /* font */
102 0x802020FF, /* arrow */
103 0x202020FF /* axis */
110 # define DPRINT(x) (void)(printf x, printf("\n"))
116 /* initialize with xtr(im,0); */
118 xtr(image_desc_t *im,time_t mytime){
121 pixie = (double) im->xsize / (double)(im->end - im->start);
124 return (int)((double)im->xorigin
125 + pixie * ( mytime - im->start ) );
128 /* translate data values into y coordinates */
130 ytr(image_desc_t *im, double value){
135 pixie = (double) im->ysize / (im->maxval - im->minval);
137 pixie = (double) im->ysize / (log10(im->maxval) - log10(im->minval));
139 } else if(!im->logarithmic) {
140 yval = im->yorigin - pixie * (value - im->minval);
142 if (value < im->minval) {
145 yval = im->yorigin - pixie * (log10(value) - log10(im->minval));
148 /* make sure we don't return anything too unreasonable. GD lib can
149 get terribly slow when drawing lines outside its scope. This is
150 especially problematic in connection with the rigid option */
152 /* keep yval as-is */
153 } else if (yval > im->yorigin) {
154 yval = im->yorigin+2;
155 } else if (yval < im->yorigin - im->ysize){
156 yval = im->yorigin - im->ysize - 2;
163 /* conversion function for symbolic entry names */
166 #define conv_if(VV,VVV) \
167 if (strcmp(#VV, string) == 0) return VVV ;
169 enum gf_en gf_conv(char *string){
171 conv_if(PRINT,GF_PRINT)
172 conv_if(GPRINT,GF_GPRINT)
173 conv_if(COMMENT,GF_COMMENT)
174 conv_if(HRULE,GF_HRULE)
175 conv_if(VRULE,GF_VRULE)
176 conv_if(LINE,GF_LINE)
177 conv_if(AREA,GF_AREA)
178 conv_if(STACK,GF_STACK)
179 conv_if(TICK,GF_TICK)
181 conv_if(CDEF,GF_CDEF)
182 conv_if(VDEF,GF_VDEF)
184 conv_if(PART,GF_PART)
186 conv_if(XPORT,GF_XPORT)
187 conv_if(SHIFT,GF_SHIFT)
192 enum gfx_if_en if_conv(char *string){
202 enum tmt_en tmt_conv(char *string){
204 conv_if(SECOND,TMT_SECOND)
205 conv_if(MINUTE,TMT_MINUTE)
206 conv_if(HOUR,TMT_HOUR)
208 conv_if(WEEK,TMT_WEEK)
209 conv_if(MONTH,TMT_MONTH)
210 conv_if(YEAR,TMT_YEAR)
214 enum grc_en grc_conv(char *string){
216 conv_if(BACK,GRC_BACK)
217 conv_if(CANVAS,GRC_CANVAS)
218 conv_if(SHADEA,GRC_SHADEA)
219 conv_if(SHADEB,GRC_SHADEB)
220 conv_if(GRID,GRC_GRID)
221 conv_if(MGRID,GRC_MGRID)
222 conv_if(FONT,GRC_FONT)
223 conv_if(ARROW,GRC_ARROW)
224 conv_if(AXIS,GRC_AXIS)
229 enum text_prop_en text_prop_conv(char *string){
231 conv_if(DEFAULT,TEXT_PROP_DEFAULT)
232 conv_if(TITLE,TEXT_PROP_TITLE)
233 conv_if(AXIS,TEXT_PROP_AXIS)
234 conv_if(UNIT,TEXT_PROP_UNIT)
235 conv_if(LEGEND,TEXT_PROP_LEGEND)
243 im_free(image_desc_t *im)
247 if (im == NULL) return 0;
248 for(i=0;i<(unsigned)im->gdes_c;i++){
249 if (im->gdes[i].data_first){
250 /* careful here, because a single pointer can occur several times */
251 free (im->gdes[i].data);
252 if (im->gdes[i].ds_namv){
253 for (ii=0;ii<im->gdes[i].ds_cnt;ii++)
254 free(im->gdes[i].ds_namv[ii]);
255 free(im->gdes[i].ds_namv);
258 free (im->gdes[i].p_data);
259 free (im->gdes[i].rpnp);
262 gfx_destroy(im->canvas);
266 /* find SI magnitude symbol for the given number*/
269 image_desc_t *im, /* image description */
276 char *symbol[] = {"a", /* 10e-18 Atto */
277 "f", /* 10e-15 Femto */
278 "p", /* 10e-12 Pico */
279 "n", /* 10e-9 Nano */
280 "u", /* 10e-6 Micro */
281 "m", /* 10e-3 Milli */
286 "T", /* 10e12 Tera */
287 "P", /* 10e15 Peta */
293 if (*value == 0.0 || isnan(*value) ) {
297 sindex = floor(log(fabs(*value))/log((double)im->base));
298 *magfact = pow((double)im->base, (double)sindex);
299 (*value) /= (*magfact);
301 if ( sindex <= symbcenter && sindex >= -symbcenter) {
302 (*symb_ptr) = symbol[sindex+symbcenter];
310 /* find SI magnitude symbol for the numbers on the y-axis*/
313 image_desc_t *im /* image description */
317 char symbol[] = {'a', /* 10e-18 Atto */
318 'f', /* 10e-15 Femto */
319 'p', /* 10e-12 Pico */
320 'n', /* 10e-9 Nano */
321 'u', /* 10e-6 Micro */
322 'm', /* 10e-3 Milli */
327 'T', /* 10e12 Tera */
328 'P', /* 10e15 Peta */
334 if (im->unitsexponent != 9999) {
335 /* unitsexponent = 9, 6, 3, 0, -3, -6, -9, etc */
336 digits = floor(im->unitsexponent / 3);
338 digits = floor( log( max( fabs(im->minval),fabs(im->maxval)))/log((double)im->base));
340 im->magfact = pow((double)im->base , digits);
343 printf("digits %6.3f im->magfact %6.3f\n",digits,im->magfact);
346 if ( ((digits+symbcenter) < sizeof(symbol)) &&
347 ((digits+symbcenter) >= 0) )
348 im->symbol = symbol[(int)digits+symbcenter];
353 /* move min and max values around to become sensible */
356 expand_range(image_desc_t *im)
358 double sensiblevalues[] ={1000.0,900.0,800.0,750.0,700.0,
359 600.0,500.0,400.0,300.0,250.0,
360 200.0,125.0,100.0,90.0,80.0,
361 75.0,70.0,60.0,50.0,40.0,30.0,
362 25.0,20.0,10.0,9.0,8.0,
363 7.0,6.0,5.0,4.0,3.5,3.0,
364 2.5,2.0,1.8,1.5,1.2,1.0,
365 0.8,0.7,0.6,0.5,0.4,0.3,0.2,0.1,0.0,-1};
367 double scaled_min,scaled_max;
374 printf("Min: %6.2f Max: %6.2f MagFactor: %6.2f\n",
375 im->minval,im->maxval,im->magfact);
378 if (isnan(im->ygridstep)){
379 if(im->extra_flags & ALTAUTOSCALE) {
380 /* measure the amplitude of the function. Make sure that
381 graph boundaries are slightly higher then max/min vals
382 so we can see amplitude on the graph */
385 delt = im->maxval - im->minval;
387 fact = 2.0 * pow(10.0,
388 floor(log10(max(fabs(im->minval), fabs(im->maxval)))) - 2);
390 adj = (fact - delt) * 0.55;
392 printf("Min: %6.2f Max: %6.2f delt: %6.2f fact: %6.2f adj: %6.2f\n", im->minval, im->maxval, delt, fact, adj);
398 else if(im->extra_flags & ALTAUTOSCALE_MAX) {
399 /* measure the amplitude of the function. Make sure that
400 graph boundaries are slightly higher than max vals
401 so we can see amplitude on the graph */
402 adj = (im->maxval - im->minval) * 0.1;
406 scaled_min = im->minval / im->magfact;
407 scaled_max = im->maxval / im->magfact;
409 for (i=1; sensiblevalues[i] > 0; i++){
410 if (sensiblevalues[i-1]>=scaled_min &&
411 sensiblevalues[i]<=scaled_min)
412 im->minval = sensiblevalues[i]*(im->magfact);
414 if (-sensiblevalues[i-1]<=scaled_min &&
415 -sensiblevalues[i]>=scaled_min)
416 im->minval = -sensiblevalues[i-1]*(im->magfact);
418 if (sensiblevalues[i-1] >= scaled_max &&
419 sensiblevalues[i] <= scaled_max)
420 im->maxval = sensiblevalues[i-1]*(im->magfact);
422 if (-sensiblevalues[i-1]<=scaled_max &&
423 -sensiblevalues[i] >=scaled_max)
424 im->maxval = -sensiblevalues[i]*(im->magfact);
426 /* no sensiblevalues found. we switch to ALTYGRID mode */
427 if (sensiblevalues[i] == 0){
428 im->extra_flags |= ALTYGRID;
432 /* adjust min and max to the grid definition if there is one */
433 im->minval = (double)im->ylabfact * im->ygridstep *
434 floor(im->minval / ((double)im->ylabfact * im->ygridstep));
435 im->maxval = (double)im->ylabfact * im->ygridstep *
436 ceil(im->maxval /( (double)im->ylabfact * im->ygridstep));
440 fprintf(stderr,"SCALED Min: %6.2f Max: %6.2f Factor: %6.2f\n",
441 im->minval,im->maxval,im->magfact);
446 apply_gridfit(image_desc_t *im)
448 if (isnan(im->minval) || isnan(im->maxval))
451 if (im->logarithmic) {
452 double ya, yb, ypix, ypixfrac;
453 double log10_range = log10(im->maxval) - log10(im->minval);
454 ya = pow((double)10, floor(log10(im->minval)));
455 while (ya < im->minval)
458 return; /* don't have y=10^x gridline */
460 if (yb <= im->maxval) {
461 /* we have at least 2 y=10^x gridlines.
462 Make sure distance between them in pixels
463 are an integer by expanding im->maxval */
464 double y_pixel_delta = ytr(im, ya) - ytr(im, yb);
465 double factor = y_pixel_delta / floor(y_pixel_delta);
466 double new_log10_range = factor * log10_range;
467 double new_ymax_log10 = log10(im->minval) + new_log10_range;
468 im->maxval = pow(10, new_ymax_log10);
469 ytr(im, DNAN); /* reset precalc */
470 log10_range = log10(im->maxval) - log10(im->minval);
472 /* make sure first y=10^x gridline is located on
473 integer pixel position by moving scale slightly
474 downwards (sub-pixel movement) */
475 ypix = ytr(im, ya) + im->ysize; /* add im->ysize so it always is positive */
476 ypixfrac = ypix - floor(ypix);
477 if (ypixfrac > 0 && ypixfrac < 1) {
478 double yfrac = ypixfrac / im->ysize;
479 im->minval = pow(10, log10(im->minval) - yfrac * log10_range);
480 im->maxval = pow(10, log10(im->maxval) - yfrac * log10_range);
481 ytr(im, DNAN); /* reset precalc */
484 /* Make sure we have an integer pixel distance between
485 each minor gridline */
486 double ypos1 = ytr(im, im->minval);
487 double ypos2 = ytr(im, im->minval + im->ygrid_scale.gridstep);
488 double y_pixel_delta = ypos1 - ypos2;
489 double factor = y_pixel_delta / floor(y_pixel_delta);
490 double new_range = factor * (im->maxval - im->minval);
491 double gridstep = im->ygrid_scale.gridstep;
492 double minor_y, minor_y_px, minor_y_px_frac;
493 im->maxval = im->minval + new_range;
494 ytr(im, DNAN); /* reset precalc */
495 /* make sure first minor gridline is on integer pixel y coord */
496 minor_y = gridstep * floor(im->minval / gridstep);
497 while (minor_y < im->minval)
499 minor_y_px = ytr(im, minor_y) + im->ysize; /* ensure > 0 by adding ysize */
500 minor_y_px_frac = minor_y_px - floor(minor_y_px);
501 if (minor_y_px_frac > 0 && minor_y_px_frac < 1) {
502 double yfrac = minor_y_px_frac / im->ysize;
503 double range = im->maxval - im->minval;
504 im->minval = im->minval - yfrac * range;
505 im->maxval = im->maxval - yfrac * range;
506 ytr(im, DNAN); /* reset precalc */
508 calc_horizontal_grid(im); /* recalc with changed im->maxval */
512 /* reduce data reimplementation by Alex */
516 enum cf_en cf, /* which consolidation function ?*/
517 unsigned long cur_step, /* step the data currently is in */
518 time_t *start, /* start, end and step as requested ... */
519 time_t *end, /* ... by the application will be ... */
520 unsigned long *step, /* ... adjusted to represent reality */
521 unsigned long *ds_cnt, /* number of data sources in file */
522 rrd_value_t **data) /* two dimensional array containing the data */
524 int i,reduce_factor = ceil((double)(*step) / (double)cur_step);
525 unsigned long col,dst_row,row_cnt,start_offset,end_offset,skiprows=0;
526 rrd_value_t *srcptr,*dstptr;
528 (*step) = cur_step*reduce_factor; /* set new step size for reduced data */
531 row_cnt = ((*end)-(*start))/cur_step;
537 printf("Reducing %lu rows with factor %i time %lu to %lu, step %lu\n",
538 row_cnt,reduce_factor,*start,*end,cur_step);
539 for (col=0;col<row_cnt;col++) {
540 printf("time %10lu: ",*start+(col+1)*cur_step);
541 for (i=0;i<*ds_cnt;i++)
542 printf(" %8.2e",srcptr[*ds_cnt*col+i]);
547 /* We have to combine [reduce_factor] rows of the source
548 ** into one row for the destination. Doing this we also
549 ** need to take care to combine the correct rows. First
550 ** alter the start and end time so that they are multiples
551 ** of the new step time. We cannot reduce the amount of
552 ** time so we have to move the end towards the future and
553 ** the start towards the past.
555 end_offset = (*end) % (*step);
556 start_offset = (*start) % (*step);
558 /* If there is a start offset (which cannot be more than
559 ** one destination row), skip the appropriate number of
560 ** source rows and one destination row. The appropriate
561 ** number is what we do know (start_offset/cur_step) of
562 ** the new interval (*step/cur_step aka reduce_factor).
565 printf("start_offset: %lu end_offset: %lu\n",start_offset,end_offset);
566 printf("row_cnt before: %lu\n",row_cnt);
569 (*start) = (*start)-start_offset;
570 skiprows=reduce_factor-start_offset/cur_step;
571 srcptr+=skiprows* *ds_cnt;
572 for (col=0;col<(*ds_cnt);col++) *dstptr++ = DNAN;
576 printf("row_cnt between: %lu\n",row_cnt);
579 /* At the end we have some rows that are not going to be
580 ** used, the amount is end_offset/cur_step
583 (*end) = (*end)-end_offset+(*step);
584 skiprows = end_offset/cur_step;
588 printf("row_cnt after: %lu\n",row_cnt);
591 /* Sanity check: row_cnt should be multiple of reduce_factor */
592 /* if this gets triggered, something is REALLY WRONG ... we die immediately */
594 if (row_cnt%reduce_factor) {
595 printf("SANITY CHECK: %lu rows cannot be reduced by %i \n",
596 row_cnt,reduce_factor);
597 printf("BUG in reduce_data()\n");
601 /* Now combine reduce_factor intervals at a time
602 ** into one interval for the destination.
605 for (dst_row=0;(long int)row_cnt>=reduce_factor;dst_row++) {
606 for (col=0;col<(*ds_cnt);col++) {
607 rrd_value_t newval=DNAN;
608 unsigned long validval=0;
610 for (i=0;i<reduce_factor;i++) {
611 if (isnan(srcptr[i*(*ds_cnt)+col])) {
615 if (isnan(newval)) newval = srcptr[i*(*ds_cnt)+col];
623 newval += srcptr[i*(*ds_cnt)+col];
626 newval = min (newval,srcptr[i*(*ds_cnt)+col]);
629 /* an interval contains a failure if any subintervals contained a failure */
631 newval = max (newval,srcptr[i*(*ds_cnt)+col]);
634 newval = srcptr[i*(*ds_cnt)+col];
639 if (validval == 0){newval = DNAN;} else{
657 srcptr+=(*ds_cnt)*reduce_factor;
658 row_cnt-=reduce_factor;
660 /* If we had to alter the endtime, we didn't have enough
661 ** source rows to fill the last row. Fill it with NaN.
663 if (end_offset) for (col=0;col<(*ds_cnt);col++) *dstptr++ = DNAN;
665 row_cnt = ((*end)-(*start))/ *step;
667 printf("Done reducing. Currently %lu rows, time %lu to %lu, step %lu\n",
668 row_cnt,*start,*end,*step);
669 for (col=0;col<row_cnt;col++) {
670 printf("time %10lu: ",*start+(col+1)*(*step));
671 for (i=0;i<*ds_cnt;i++)
672 printf(" %8.2e",srcptr[*ds_cnt*col+i]);
679 /* get the data required for the graphs from the
683 data_fetch(image_desc_t *im )
688 /* pull the data from the log files ... */
689 for (i=0;i< (int)im->gdes_c;i++){
690 /* only GF_DEF elements fetch data */
691 if (im->gdes[i].gf != GF_DEF)
695 /* do we have it already ?*/
696 for (ii=0;ii<i;ii++) {
697 if (im->gdes[ii].gf != GF_DEF)
699 if ((strcmp(im->gdes[i].rrd, im->gdes[ii].rrd) == 0)
700 && (im->gdes[i].cf == im->gdes[ii].cf)
701 && (im->gdes[i].cf_reduce == im->gdes[ii].cf_reduce)
702 && (im->gdes[i].start == im->gdes[ii].start)
703 && (im->gdes[i].end == im->gdes[ii].end)
704 && (im->gdes[i].step == im->gdes[ii].step)) {
705 /* OK, the data is already there.
706 ** Just copy the header portion
708 im->gdes[i].start = im->gdes[ii].start;
709 im->gdes[i].end = im->gdes[ii].end;
710 im->gdes[i].step = im->gdes[ii].step;
711 im->gdes[i].ds_cnt = im->gdes[ii].ds_cnt;
712 im->gdes[i].ds_namv = im->gdes[ii].ds_namv;
713 im->gdes[i].data = im->gdes[ii].data;
714 im->gdes[i].data_first = 0;
721 unsigned long ft_step = im->gdes[i].step ;
723 if((rrd_fetch_fn(im->gdes[i].rrd,
729 &im->gdes[i].ds_namv,
730 &im->gdes[i].data)) == -1){
733 im->gdes[i].data_first = 1;
734 im->gdes[i].step = im->step;
736 if (ft_step < im->gdes[i].step) {
737 reduce_data(im->gdes[i].cf_reduce,
745 im->gdes[i].step = ft_step;
749 /* lets see if the required data source is really there */
750 for(ii=0;ii<(int)im->gdes[i].ds_cnt;ii++){
751 if(strcmp(im->gdes[i].ds_namv[ii],im->gdes[i].ds_nam) == 0){
754 if (im->gdes[i].ds== -1){
755 rrd_set_error("No DS called '%s' in '%s'",
756 im->gdes[i].ds_nam,im->gdes[i].rrd);
764 /* evaluate the expressions in the CDEF functions */
766 /*************************************************************
768 *************************************************************/
771 find_var_wrapper(void *arg1, char *key)
773 return find_var((image_desc_t *) arg1, key);
776 /* find gdes containing var*/
778 find_var(image_desc_t *im, char *key){
780 for(ii=0;ii<im->gdes_c-1;ii++){
781 if((im->gdes[ii].gf == GF_DEF
782 || im->gdes[ii].gf == GF_VDEF
783 || im->gdes[ii].gf == GF_CDEF)
784 && (strcmp(im->gdes[ii].vname,key) == 0)){
791 /* find the largest common denominator for all the numbers
792 in the 0 terminated num array */
797 for (i=0;num[i+1]!=0;i++){
799 rest=num[i] % num[i+1];
800 num[i]=num[i+1]; num[i+1]=rest;
804 /* return i==0?num[i]:num[i-1]; */
808 /* run the rpn calculator on all the VDEF and CDEF arguments */
810 data_calc( image_desc_t *im){
814 long *steparray, rpi;
819 rpnstack_init(&rpnstack);
821 for (gdi=0;gdi<im->gdes_c;gdi++){
822 /* Look for GF_VDEF and GF_CDEF in the same loop,
823 * so CDEFs can use VDEFs and vice versa
825 switch (im->gdes[gdi].gf) {
829 graph_desc_t *vdp = &im->gdes[im->gdes[gdi].vidx];
831 /* remove current shift */
832 vdp->start -= vdp->shift;
833 vdp->end -= vdp->shift;
836 if (im->gdes[gdi].shidx >= 0)
837 vdp->shift = im->gdes[im->gdes[gdi].shidx].vf.val;
840 vdp->shift = im->gdes[gdi].shval;
842 /* normalize shift to multiple of consolidated step */
843 vdp->shift = (vdp->shift / (long)vdp->step) * (long)vdp->step;
846 vdp->start += vdp->shift;
847 vdp->end += vdp->shift;
851 /* A VDEF has no DS. This also signals other parts
852 * of rrdtool that this is a VDEF value, not a CDEF.
854 im->gdes[gdi].ds_cnt = 0;
855 if (vdef_calc(im,gdi)) {
856 rrd_set_error("Error processing VDEF '%s'"
859 rpnstack_free(&rpnstack);
864 im->gdes[gdi].ds_cnt = 1;
865 im->gdes[gdi].ds = 0;
866 im->gdes[gdi].data_first = 1;
867 im->gdes[gdi].start = 0;
868 im->gdes[gdi].end = 0;
873 /* Find the variables in the expression.
874 * - VDEF variables are substituted by their values
875 * and the opcode is changed into OP_NUMBER.
876 * - CDEF variables are analized for their step size,
877 * the lowest common denominator of all the step
878 * sizes of the data sources involved is calculated
879 * and the resulting number is the step size for the
880 * resulting data source.
882 for(rpi=0;im->gdes[gdi].rpnp[rpi].op != OP_END;rpi++){
883 if(im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
884 im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER){
885 long ptr = im->gdes[gdi].rpnp[rpi].ptr;
886 if (im->gdes[ptr].ds_cnt == 0) {
888 printf("DEBUG: inside CDEF '%s' processing VDEF '%s'\n",
890 im->gdes[ptr].vname);
891 printf("DEBUG: value from vdef is %f\n",im->gdes[ptr].vf.val);
893 im->gdes[gdi].rpnp[rpi].val = im->gdes[ptr].vf.val;
894 im->gdes[gdi].rpnp[rpi].op = OP_NUMBER;
897 rrd_realloc(steparray,
898 (++stepcnt+1)*sizeof(*steparray)))==NULL){
899 rrd_set_error("realloc steparray");
900 rpnstack_free(&rpnstack);
904 steparray[stepcnt-1] = im->gdes[ptr].step;
906 /* adjust start and end of cdef (gdi) so
907 * that it runs from the latest start point
908 * to the earliest endpoint of any of the
909 * rras involved (ptr)
911 if(im->gdes[gdi].start < im->gdes[ptr].start)
912 im->gdes[gdi].start = im->gdes[ptr].start;
914 if(im->gdes[gdi].end == 0 ||
915 im->gdes[gdi].end > im->gdes[ptr].end)
916 im->gdes[gdi].end = im->gdes[ptr].end;
918 /* store pointer to the first element of
919 * the rra providing data for variable,
920 * further save step size and data source
923 im->gdes[gdi].rpnp[rpi].data = im->gdes[ptr].data + im->gdes[ptr].ds;
924 im->gdes[gdi].rpnp[rpi].step = im->gdes[ptr].step;
925 im->gdes[gdi].rpnp[rpi].ds_cnt = im->gdes[ptr].ds_cnt;
927 /* backoff the *.data ptr; this is done so
928 * rpncalc() function doesn't have to treat
929 * the first case differently
931 } /* if ds_cnt != 0 */
932 } /* if OP_VARIABLE */
933 } /* loop through all rpi */
935 /* move the data pointers to the correct period */
936 for(rpi=0;im->gdes[gdi].rpnp[rpi].op != OP_END;rpi++){
937 if(im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
938 im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER){
939 long ptr = im->gdes[gdi].rpnp[rpi].ptr;
940 long diff = im->gdes[gdi].start - im->gdes[ptr].start;
943 im->gdes[gdi].rpnp[rpi].data += (diff / im->gdes[ptr].step) * im->gdes[ptr].ds_cnt;
947 if(steparray == NULL){
948 rrd_set_error("rpn expressions without DEF"
949 " or CDEF variables are not supported");
950 rpnstack_free(&rpnstack);
953 steparray[stepcnt]=0;
954 /* Now find the resulting step. All steps in all
955 * used RRAs have to be visited
957 im->gdes[gdi].step = lcd(steparray);
959 if((im->gdes[gdi].data = malloc((
960 (im->gdes[gdi].end-im->gdes[gdi].start)
961 / im->gdes[gdi].step)
962 * sizeof(double)))==NULL){
963 rrd_set_error("malloc im->gdes[gdi].data");
964 rpnstack_free(&rpnstack);
968 /* Step through the new cdef results array and
969 * calculate the values
971 for (now = im->gdes[gdi].start + im->gdes[gdi].step;
972 now<=im->gdes[gdi].end;
973 now += im->gdes[gdi].step)
975 rpnp_t *rpnp = im -> gdes[gdi].rpnp;
977 /* 3rd arg of rpn_calc is for OP_VARIABLE lookups;
978 * in this case we are advancing by timesteps;
979 * we use the fact that time_t is a synonym for long
981 if (rpn_calc(rpnp,&rpnstack,(long) now,
982 im->gdes[gdi].data,++dataidx) == -1) {
983 /* rpn_calc sets the error string */
984 rpnstack_free(&rpnstack);
987 } /* enumerate over time steps within a CDEF */
992 } /* enumerate over CDEFs */
993 rpnstack_free(&rpnstack);
997 /* massage data so, that we get one value for each x coordinate in the graph */
999 data_proc( image_desc_t *im ){
1001 double pixstep = (double)(im->end-im->start)
1002 /(double)im->xsize; /* how much time
1003 passes in one pixel */
1005 double minval=DNAN,maxval=DNAN;
1007 unsigned long gr_time;
1009 /* memory for the processed data */
1010 for(i=0;i<im->gdes_c;i++) {
1011 if((im->gdes[i].gf==GF_LINE) ||
1012 (im->gdes[i].gf==GF_AREA) ||
1013 (im->gdes[i].gf==GF_TICK) ||
1014 (im->gdes[i].gf==GF_STACK)) {
1015 if((im->gdes[i].p_data = malloc((im->xsize +1)
1016 * sizeof(rrd_value_t)))==NULL){
1017 rrd_set_error("malloc data_proc");
1023 for (i=0;i<im->xsize;i++) { /* for each pixel */
1025 gr_time = im->start+pixstep*i; /* time of the current step */
1028 for (ii=0;ii<im->gdes_c;ii++) {
1030 switch (im->gdes[ii].gf) {
1034 if (!im->gdes[ii].stack)
1037 value = im->gdes[ii].yrule;
1038 if (isnan(value) || (im->gdes[ii].gf == GF_TICK)) {
1039 /* The time of the data doesn't necessarily match
1040 ** the time of the graph. Beware.
1042 vidx = im->gdes[ii].vidx;
1043 if (im->gdes[vidx].gf == GF_VDEF) {
1044 value = im->gdes[vidx].vf.val;
1045 } else if (((long int)gr_time >= (long int)im->gdes[vidx].start) &&
1046 ((long int)gr_time <= (long int)im->gdes[vidx].end) ) {
1047 value = im->gdes[vidx].data[
1048 (unsigned long) floor(
1049 (double)(gr_time - im->gdes[vidx].start)
1050 / im->gdes[vidx].step)
1051 * im->gdes[vidx].ds_cnt
1059 if (! isnan(value)) {
1061 im->gdes[ii].p_data[i] = paintval;
1062 /* GF_TICK: the data values are not
1063 ** relevant for min and max
1065 if (finite(paintval) && im->gdes[ii].gf != GF_TICK ) {
1066 if (isnan(minval) || paintval < minval)
1068 if (isnan(maxval) || paintval > maxval)
1072 im->gdes[ii].p_data[i] = DNAN;
1081 /* if min or max have not been asigned a value this is because
1082 there was no data in the graph ... this is not good ...
1083 lets set these to dummy values then ... */
1085 if (isnan(minval)) minval = 0.0;
1086 if (isnan(maxval)) maxval = 1.0;
1088 /* adjust min and max values */
1089 if (isnan(im->minval)
1090 /* don't adjust low-end with log scale */
1091 || ((!im->logarithmic && !im->rigid) && im->minval > minval)
1093 im->minval = minval;
1094 if (isnan(im->maxval)
1095 || (!im->rigid && im->maxval < maxval)
1097 if (im->logarithmic)
1098 im->maxval = maxval * 1.1;
1100 im->maxval = maxval;
1102 /* make sure min is smaller than max */
1103 if (im->minval > im->maxval) {
1104 im->minval = 0.99 * im->maxval;
1107 /* make sure min and max are not equal */
1108 if (im->minval == im->maxval) {
1110 if (! im->logarithmic) {
1113 /* make sure min and max are not both zero */
1114 if (im->maxval == 0.0) {
1123 /* identify the point where the first gridline, label ... gets placed */
1127 time_t start, /* what is the initial time */
1128 enum tmt_en baseint, /* what is the basic interval */
1129 long basestep /* how many if these do we jump a time */
1133 localtime_r(&start, &tm);
1136 tm.tm_sec -= tm.tm_sec % basestep; break;
1139 tm.tm_min -= tm.tm_min % basestep;
1144 tm.tm_hour -= tm.tm_hour % basestep; break;
1146 /* we do NOT look at the basestep for this ... */
1149 tm.tm_hour = 0; break;
1151 /* we do NOT look at the basestep for this ... */
1155 tm.tm_mday -= tm.tm_wday -1; /* -1 because we want the monday */
1156 if (tm.tm_wday==0) tm.tm_mday -= 7; /* we want the *previous* monday */
1163 tm.tm_mon -= tm.tm_mon % basestep; break;
1171 tm.tm_year -= (tm.tm_year+1900) % basestep;
1176 /* identify the point where the next gridline, label ... gets placed */
1179 time_t current, /* what is the initial time */
1180 enum tmt_en baseint, /* what is the basic interval */
1181 long basestep /* how many if these do we jump a time */
1186 localtime_r(¤t, &tm);
1190 tm.tm_sec += basestep; break;
1192 tm.tm_min += basestep; break;
1194 tm.tm_hour += basestep; break;
1196 tm.tm_mday += basestep; break;
1198 tm.tm_mday += 7*basestep; break;
1200 tm.tm_mon += basestep; break;
1202 tm.tm_year += basestep;
1204 madetime = mktime(&tm);
1205 } while (madetime == -1); /* this is necessary to skip impssible times
1206 like the daylight saving time skips */
1212 /* calculate values required for PRINT and GPRINT functions */
1215 print_calc(image_desc_t *im, char ***prdata)
1217 long i,ii,validsteps;
1220 int graphelement = 0;
1223 double magfact = -1;
1227 if (im->imginfo) prlines++;
1228 for(i=0;i<im->gdes_c;i++){
1229 switch(im->gdes[i].gf){
1232 if(((*prdata) = rrd_realloc((*prdata),prlines*sizeof(char *)))==NULL){
1233 rrd_set_error("realloc prdata");
1237 /* PRINT and GPRINT can now print VDEF generated values.
1238 * There's no need to do any calculations on them as these
1239 * calculations were already made.
1241 vidx = im->gdes[i].vidx;
1242 if (im->gdes[vidx].gf==GF_VDEF) { /* simply use vals */
1243 printval = im->gdes[vidx].vf.val;
1244 printtime = im->gdes[vidx].vf.when;
1245 } else { /* need to calculate max,min,avg etcetera */
1246 max_ii =((im->gdes[vidx].end
1247 - im->gdes[vidx].start)
1248 / im->gdes[vidx].step
1249 * im->gdes[vidx].ds_cnt);
1252 for( ii=im->gdes[vidx].ds;
1254 ii+=im->gdes[vidx].ds_cnt){
1255 if (! finite(im->gdes[vidx].data[ii]))
1257 if (isnan(printval)){
1258 printval = im->gdes[vidx].data[ii];
1263 switch (im->gdes[i].cf){
1266 case CF_DEVSEASONAL:
1270 printval += im->gdes[vidx].data[ii];
1273 printval = min( printval, im->gdes[vidx].data[ii]);
1277 printval = max( printval, im->gdes[vidx].data[ii]);
1280 printval = im->gdes[vidx].data[ii];
1283 if (im->gdes[i].cf==CF_AVERAGE || im->gdes[i].cf > CF_LAST) {
1284 if (validsteps > 1) {
1285 printval = (printval / validsteps);
1288 } /* prepare printval */
1290 if (!strcmp(im->gdes[i].format,"%c")) { /* VDEF time print */
1291 char ctime_buf[128]; /* PS: for ctime_r, must be >= 26 chars */
1292 if (im->gdes[i].gf == GF_PRINT){
1293 (*prdata)[prlines-2] = malloc((FMT_LEG_LEN+2)*sizeof(char));
1294 sprintf((*prdata)[prlines-2],"%s (%lu)",
1295 ctime_r(&printtime,ctime_buf),printtime);
1296 (*prdata)[prlines-1] = NULL;
1298 sprintf(im->gdes[i].legend,"%s (%lu)",
1299 ctime_r(&printtime,ctime_buf),printtime);
1303 if ((percent_s = strstr(im->gdes[i].format,"%S")) != NULL) {
1304 /* Magfact is set to -1 upon entry to print_calc. If it
1305 * is still less than 0, then we need to run auto_scale.
1306 * Otherwise, put the value into the correct units. If
1307 * the value is 0, then do not set the symbol or magnification
1308 * so next the calculation will be performed again. */
1309 if (magfact < 0.0) {
1310 auto_scale(im,&printval,&si_symb,&magfact);
1311 if (printval == 0.0)
1314 printval /= magfact;
1316 *(++percent_s) = 's';
1317 } else if (strstr(im->gdes[i].format,"%s") != NULL) {
1318 auto_scale(im,&printval,&si_symb,&magfact);
1321 if (im->gdes[i].gf == GF_PRINT){
1322 (*prdata)[prlines-2] = malloc((FMT_LEG_LEN+2)*sizeof(char));
1323 (*prdata)[prlines-1] = NULL;
1324 if (bad_format(im->gdes[i].format)) {
1325 rrd_set_error("bad format for PRINT in '%s'", im->gdes[i].format);
1328 #ifdef HAVE_SNPRINTF
1329 snprintf((*prdata)[prlines-2],FMT_LEG_LEN,im->gdes[i].format,printval,si_symb);
1331 sprintf((*prdata)[prlines-2],im->gdes[i].format,printval,si_symb);
1336 if (bad_format(im->gdes[i].format)) {
1337 rrd_set_error("bad format for GPRINT in '%s'", im->gdes[i].format);
1340 #ifdef HAVE_SNPRINTF
1341 snprintf(im->gdes[i].legend,FMT_LEG_LEN-2,im->gdes[i].format,printval,si_symb);
1343 sprintf(im->gdes[i].legend,im->gdes[i].format,printval,si_symb);
1361 #ifdef WITH_PIECHART
1369 return graphelement;
1373 /* place legends with color spots */
1375 leg_place(image_desc_t *im)
1378 int interleg = im->text_prop[TEXT_PROP_LEGEND].size*2.0;
1379 int border = im->text_prop[TEXT_PROP_LEGEND].size*2.0;
1380 int fill=0, fill_last;
1382 int leg_x = border, leg_y = im->yimg;
1386 char prt_fctn; /*special printfunctions */
1389 if( !(im->extra_flags & NOLEGEND) & !(im->extra_flags & ONLY_GRAPH) ) {
1390 if ((legspace = malloc(im->gdes_c*sizeof(int)))==NULL){
1391 rrd_set_error("malloc for legspace");
1395 for(i=0;i<im->gdes_c;i++){
1398 /* hid legends for rules which are not displayed */
1400 if(!(im->extra_flags & FORCE_RULES_LEGEND)) {
1401 if (im->gdes[i].gf == GF_HRULE &&
1402 (im->gdes[i].yrule < im->minval || im->gdes[i].yrule > im->maxval))
1403 im->gdes[i].legend[0] = '\0';
1405 if (im->gdes[i].gf == GF_VRULE &&
1406 (im->gdes[i].xrule < im->start || im->gdes[i].xrule > im->end))
1407 im->gdes[i].legend[0] = '\0';
1410 leg_cc = strlen(im->gdes[i].legend);
1412 /* is there a controle code ant the end of the legend string ? */
1413 /* and it is not a tab \\t */
1414 if (leg_cc >= 2 && im->gdes[i].legend[leg_cc-2] == '\\' && im->gdes[i].legend[leg_cc-1] != 't') {
1415 prt_fctn = im->gdes[i].legend[leg_cc-1];
1417 im->gdes[i].legend[leg_cc] = '\0';
1421 /* remove exess space */
1422 while (prt_fctn=='g' &&
1424 im->gdes[i].legend[leg_cc-1]==' '){
1426 im->gdes[i].legend[leg_cc]='\0';
1429 legspace[i]=(prt_fctn=='g' ? 0 : interleg);
1432 /* no interleg space if string ends in \g */
1433 fill += legspace[i];
1435 fill += gfx_get_text_width(im->canvas, fill+border,
1436 im->text_prop[TEXT_PROP_LEGEND].font,
1437 im->text_prop[TEXT_PROP_LEGEND].size,
1439 im->gdes[i].legend, 0);
1444 /* who said there was a special tag ... ?*/
1445 if (prt_fctn=='g') {
1448 if (prt_fctn == '\0') {
1449 if (i == im->gdes_c -1 ) prt_fctn ='l';
1451 /* is it time to place the legends ? */
1452 if (fill > im->ximg - 2*border){
1467 if (prt_fctn != '\0'){
1469 if (leg_c >= 2 && prt_fctn == 'j') {
1470 glue = (im->ximg - fill - 2* border) / (leg_c-1);
1474 if (prt_fctn =='c') leg_x = (im->ximg - fill) / 2.0;
1475 if (prt_fctn =='r') leg_x = im->ximg - fill - border;
1477 for(ii=mark;ii<=i;ii++){
1478 if(im->gdes[ii].legend[0]=='\0')
1479 continue; /* skip empty legends */
1480 im->gdes[ii].leg_x = leg_x;
1481 im->gdes[ii].leg_y = leg_y;
1483 gfx_get_text_width(im->canvas, leg_x,
1484 im->text_prop[TEXT_PROP_LEGEND].font,
1485 im->text_prop[TEXT_PROP_LEGEND].size,
1487 im->gdes[ii].legend, 0)
1491 leg_y += im->text_prop[TEXT_PROP_LEGEND].size*1.7;
1492 if (prt_fctn == 's') leg_y -= im->text_prop[TEXT_PROP_LEGEND].size;
1504 /* create a grid on the graph. it determines what to do
1505 from the values of xsize, start and end */
1507 /* the xaxis labels are determined from the number of seconds per pixel
1508 in the requested graph */
1513 calc_horizontal_grid(image_desc_t *im)
1519 int decimals, fractionals;
1521 im->ygrid_scale.labfact=2;
1523 range = im->maxval - im->minval;
1524 scaledrange = range / im->magfact;
1526 /* does the scale of this graph make it impossible to put lines
1527 on it? If so, give up. */
1528 if (isnan(scaledrange)) {
1532 /* find grid spaceing */
1534 if(isnan(im->ygridstep)){
1535 if(im->extra_flags & ALTYGRID) {
1536 /* find the value with max number of digits. Get number of digits */
1537 decimals = ceil(log10(max(fabs(im->maxval), fabs(im->minval))));
1538 if(decimals <= 0) /* everything is small. make place for zero */
1541 fractionals = floor(log10(range));
1542 if(fractionals < 0) { /* small amplitude. */
1543 int len = decimals - fractionals + 1;
1544 if (im->unitslength < len) im->unitslength = len;
1545 sprintf(im->ygrid_scale.labfmt, "%%%d.%df", len, -fractionals + 1);
1547 int len = decimals + 1;
1548 if (im->unitslength < len) im->unitslength = len;
1549 sprintf(im->ygrid_scale.labfmt, "%%%d.1f", len);
1551 im->ygrid_scale.gridstep = pow((double)10, (double)fractionals);
1552 if(im->ygrid_scale.gridstep == 0) /* range is one -> 0.1 is reasonable scale */
1553 im->ygrid_scale.gridstep = 0.1;
1554 /* should have at least 5 lines but no more then 15 */
1555 if(range/im->ygrid_scale.gridstep < 5)
1556 im->ygrid_scale.gridstep /= 10;
1557 if(range/im->ygrid_scale.gridstep > 15)
1558 im->ygrid_scale.gridstep *= 10;
1559 if(range/im->ygrid_scale.gridstep > 5) {
1560 im->ygrid_scale.labfact = 1;
1561 if(range/im->ygrid_scale.gridstep > 8)
1562 im->ygrid_scale.labfact = 2;
1565 im->ygrid_scale.gridstep /= 5;
1566 im->ygrid_scale.labfact = 5;
1570 for(i=0;ylab[i].grid > 0;i++){
1571 pixel = im->ysize / (scaledrange / ylab[i].grid);
1579 if (pixel * ylab[gridind].lfac[i] >= 2 * im->text_prop[TEXT_PROP_AXIS].size) {
1580 im->ygrid_scale.labfact = ylab[gridind].lfac[i];
1585 im->ygrid_scale.gridstep = ylab[gridind].grid * im->magfact;
1588 im->ygrid_scale.gridstep = im->ygridstep;
1589 im->ygrid_scale.labfact = im->ylabfact;
1594 int draw_horizontal_grid(image_desc_t *im)
1598 char graph_label[100];
1599 double X0=im->xorigin;
1600 double X1=im->xorigin+im->xsize;
1602 int sgrid = (int)( im->minval / im->ygrid_scale.gridstep - 1);
1603 int egrid = (int)( im->maxval / im->ygrid_scale.gridstep + 1);
1604 scaledstep = im->ygrid_scale.gridstep/im->magfact;
1605 for (i = sgrid; i <= egrid; i++){
1606 double Y0=ytr(im,im->ygrid_scale.gridstep*i);
1607 if ( Y0 >= im->yorigin-im->ysize
1608 && Y0 <= im->yorigin){
1609 if(i % im->ygrid_scale.labfact == 0){
1610 if (i==0 || im->symbol == ' ') {
1612 if(im->extra_flags & ALTYGRID) {
1613 sprintf(graph_label,im->ygrid_scale.labfmt,scaledstep*i);
1616 sprintf(graph_label,"%4.1f",scaledstep*i);
1619 sprintf(graph_label,"%4.0f",scaledstep*i);
1623 sprintf(graph_label,"%4.1f %c",scaledstep*i, im->symbol);
1625 sprintf(graph_label,"%4.0f %c",scaledstep*i, im->symbol);
1629 gfx_new_text ( im->canvas,
1630 X0-im->text_prop[TEXT_PROP_AXIS].size, Y0,
1631 im->graph_col[GRC_FONT],
1632 im->text_prop[TEXT_PROP_AXIS].font,
1633 im->text_prop[TEXT_PROP_AXIS].size,
1634 im->tabwidth, 0.0, GFX_H_RIGHT, GFX_V_CENTER,
1636 gfx_new_dashed_line ( im->canvas,
1639 MGRIDWIDTH, im->graph_col[GRC_MGRID],
1640 im->grid_dash_on, im->grid_dash_off);
1642 } else if (!(im->extra_flags & NOMINOR)) {
1643 gfx_new_dashed_line ( im->canvas,
1646 GRIDWIDTH, im->graph_col[GRC_GRID],
1647 im->grid_dash_on, im->grid_dash_off);
1655 /* logaritmic horizontal grid */
1657 horizontal_log_grid(image_desc_t *im)
1661 int minoridx=0, majoridx=0;
1662 char graph_label[100];
1664 double value, pixperstep, minstep;
1666 /* find grid spaceing */
1667 pixpex= (double)im->ysize / (log10(im->maxval) - log10(im->minval));
1669 if (isnan(pixpex)) {
1673 for(i=0;yloglab[i][0] > 0;i++){
1674 minstep = log10(yloglab[i][0]);
1675 for(ii=1;yloglab[i][ii+1] > 0;ii++){
1676 if(yloglab[i][ii+2]==0){
1677 minstep = log10(yloglab[i][ii+1])-log10(yloglab[i][ii]);
1681 pixperstep = pixpex * minstep;
1682 if(pixperstep > 5){minoridx = i;}
1683 if(pixperstep > 2 * im->text_prop[TEXT_PROP_LEGEND].size){majoridx = i;}
1687 X1=im->xorigin+im->xsize;
1688 /* paint minor grid */
1689 for (value = pow((double)10, log10(im->minval)
1690 - fmod(log10(im->minval),log10(yloglab[minoridx][0])));
1691 value <= im->maxval;
1692 value *= yloglab[minoridx][0]){
1693 if (value < im->minval) continue;
1695 while(yloglab[minoridx][++i] > 0){
1696 Y0 = ytr(im,value * yloglab[minoridx][i]);
1697 if (Y0 <= im->yorigin - im->ysize) break;
1698 gfx_new_dashed_line ( im->canvas,
1701 GRIDWIDTH, im->graph_col[GRC_GRID],
1702 im->grid_dash_on, im->grid_dash_off);
1706 /* paint major grid and labels*/
1707 for (value = pow((double)10, log10(im->minval)
1708 - fmod(log10(im->minval),log10(yloglab[majoridx][0])));
1709 value <= im->maxval;
1710 value *= yloglab[majoridx][0]){
1711 if (value < im->minval) continue;
1713 while(yloglab[majoridx][++i] > 0){
1714 Y0 = ytr(im,value * yloglab[majoridx][i]);
1715 if (Y0 <= im->yorigin - im->ysize) break;
1716 gfx_new_dashed_line ( im->canvas,
1719 MGRIDWIDTH, im->graph_col[GRC_MGRID],
1720 im->grid_dash_on, im->grid_dash_off);
1722 sprintf(graph_label,"%3.0e",value * yloglab[majoridx][i]);
1723 gfx_new_text ( im->canvas,
1724 X0-im->text_prop[TEXT_PROP_AXIS].size, Y0,
1725 im->graph_col[GRC_FONT],
1726 im->text_prop[TEXT_PROP_AXIS].font,
1727 im->text_prop[TEXT_PROP_AXIS].size,
1728 im->tabwidth,0.0, GFX_H_RIGHT, GFX_V_CENTER,
1740 int xlab_sel; /* which sort of label and grid ? */
1741 time_t ti, tilab, timajor;
1743 char graph_label[100];
1744 double X0,Y0,Y1; /* points for filled graph and more*/
1747 /* the type of time grid is determined by finding
1748 the number of seconds per pixel in the graph */
1751 if(im->xlab_user.minsec == -1){
1752 factor=(im->end - im->start)/im->xsize;
1754 while ( xlab[xlab_sel+1].minsec != -1
1755 && xlab[xlab_sel+1].minsec <= factor){ xlab_sel++; }
1756 im->xlab_user.gridtm = xlab[xlab_sel].gridtm;
1757 im->xlab_user.gridst = xlab[xlab_sel].gridst;
1758 im->xlab_user.mgridtm = xlab[xlab_sel].mgridtm;
1759 im->xlab_user.mgridst = xlab[xlab_sel].mgridst;
1760 im->xlab_user.labtm = xlab[xlab_sel].labtm;
1761 im->xlab_user.labst = xlab[xlab_sel].labst;
1762 im->xlab_user.precis = xlab[xlab_sel].precis;
1763 im->xlab_user.stst = xlab[xlab_sel].stst;
1766 /* y coords are the same for every line ... */
1768 Y1 = im->yorigin-im->ysize;
1771 /* paint the minor grid */
1772 if (!(im->extra_flags & NOMINOR))
1774 for(ti = find_first_time(im->start,
1775 im->xlab_user.gridtm,
1776 im->xlab_user.gridst),
1777 timajor = find_first_time(im->start,
1778 im->xlab_user.mgridtm,
1779 im->xlab_user.mgridst);
1781 ti = find_next_time(ti,im->xlab_user.gridtm,im->xlab_user.gridst)
1783 /* are we inside the graph ? */
1784 if (ti < im->start || ti > im->end) continue;
1785 while (timajor < ti) {
1786 timajor = find_next_time(timajor,
1787 im->xlab_user.mgridtm, im->xlab_user.mgridst);
1789 if (ti == timajor) continue; /* skip as falls on major grid line */
1791 gfx_new_dashed_line(im->canvas,X0,Y0+1, X0,Y1-1,GRIDWIDTH,
1792 im->graph_col[GRC_GRID],
1793 im->grid_dash_on, im->grid_dash_off);
1798 /* paint the major grid */
1799 for(ti = find_first_time(im->start,
1800 im->xlab_user.mgridtm,
1801 im->xlab_user.mgridst);
1803 ti = find_next_time(ti,im->xlab_user.mgridtm,im->xlab_user.mgridst)
1805 /* are we inside the graph ? */
1806 if (ti < im->start || ti > im->end) continue;
1808 gfx_new_dashed_line(im->canvas,X0,Y0+3, X0,Y1-2,MGRIDWIDTH,
1809 im->graph_col[GRC_MGRID],
1810 im->grid_dash_on, im->grid_dash_off);
1813 /* paint the labels below the graph */
1814 for(ti = find_first_time(im->start - im->xlab_user.precis/2,
1815 im->xlab_user.labtm,
1816 im->xlab_user.labst);
1817 ti <= im->end - im->xlab_user.precis/2;
1818 ti = find_next_time(ti,im->xlab_user.labtm,im->xlab_user.labst)
1820 tilab= ti + im->xlab_user.precis/2; /* correct time for the label */
1821 /* are we inside the graph ? */
1822 if (tilab < im->start || tilab > im->end) continue;
1825 localtime_r(&tilab, &tm);
1826 strftime(graph_label,99,im->xlab_user.stst, &tm);
1828 # error "your libc has no strftime I guess we'll abort the exercise here."
1830 gfx_new_text ( im->canvas,
1831 xtr(im,tilab), Y0+im->text_prop[TEXT_PROP_AXIS].size,
1832 im->graph_col[GRC_FONT],
1833 im->text_prop[TEXT_PROP_AXIS].font,
1834 im->text_prop[TEXT_PROP_AXIS].size,
1835 im->tabwidth, 0.0, GFX_H_CENTER, GFX_V_TOP,
1848 /* draw x and y axis */
1849 /* gfx_new_line ( im->canvas, im->xorigin+im->xsize,im->yorigin,
1850 im->xorigin+im->xsize,im->yorigin-im->ysize,
1851 GRIDWIDTH, im->graph_col[GRC_AXIS]);
1853 gfx_new_line ( im->canvas, im->xorigin,im->yorigin-im->ysize,
1854 im->xorigin+im->xsize,im->yorigin-im->ysize,
1855 GRIDWIDTH, im->graph_col[GRC_AXIS]); */
1857 gfx_new_line ( im->canvas, im->xorigin-4,im->yorigin,
1858 im->xorigin+im->xsize+4,im->yorigin,
1859 MGRIDWIDTH, im->graph_col[GRC_AXIS]);
1861 gfx_new_line ( im->canvas, im->xorigin,im->yorigin+4,
1862 im->xorigin,im->yorigin-im->ysize-4,
1863 MGRIDWIDTH, im->graph_col[GRC_AXIS]);
1866 /* arrow for X and Y axis direction */
1867 gfx_new_area ( im->canvas,
1868 im->xorigin+im->xsize+2, im->yorigin-2,
1869 im->xorigin+im->xsize+2, im->yorigin+3,
1870 im->xorigin+im->xsize+7, im->yorigin+0.5, /* LINEOFFSET */
1871 im->graph_col[GRC_ARROW]);
1873 gfx_new_area ( im->canvas,
1874 im->xorigin-2, im->yorigin-im->ysize-2,
1875 im->xorigin+3, im->yorigin-im->ysize-2,
1876 im->xorigin+0.5, im->yorigin-im->ysize-7, /* LINEOFFSET */
1877 im->graph_col[GRC_ARROW]);
1882 grid_paint(image_desc_t *im)
1886 double X0,Y0; /* points for filled graph and more*/
1889 /* draw 3d border */
1890 node = gfx_new_area (im->canvas, 0,im->yimg,
1892 2,2,im->graph_col[GRC_SHADEA]);
1893 gfx_add_point( node , im->ximg - 2, 2 );
1894 gfx_add_point( node , im->ximg, 0 );
1895 gfx_add_point( node , 0,0 );
1896 /* gfx_add_point( node , 0,im->yimg ); */
1898 node = gfx_new_area (im->canvas, 2,im->yimg-2,
1899 im->ximg-2,im->yimg-2,
1901 im->graph_col[GRC_SHADEB]);
1902 gfx_add_point( node , im->ximg,0);
1903 gfx_add_point( node , im->ximg,im->yimg);
1904 gfx_add_point( node , 0,im->yimg);
1905 /* gfx_add_point( node , 0,im->yimg ); */
1908 if (im->draw_x_grid == 1 )
1911 if (im->draw_y_grid == 1){
1912 if(im->logarithmic){
1913 res = horizontal_log_grid(im);
1915 res = draw_horizontal_grid(im);
1918 /* dont draw horizontal grid if there is no min and max val */
1920 char *nodata = "No Data found";
1921 gfx_new_text(im->canvas,im->ximg/2, (2*im->yorigin-im->ysize) / 2,
1922 im->graph_col[GRC_FONT],
1923 im->text_prop[TEXT_PROP_AXIS].font,
1924 im->text_prop[TEXT_PROP_AXIS].size,
1925 im->tabwidth, 0.0, GFX_H_CENTER, GFX_V_CENTER,
1930 /* yaxis unit description */
1931 gfx_new_text( im->canvas,
1932 7, (im->yorigin - im->ysize/2),
1933 im->graph_col[GRC_FONT],
1934 im->text_prop[TEXT_PROP_UNIT].font,
1935 im->text_prop[TEXT_PROP_UNIT].size, im->tabwidth,
1936 RRDGRAPH_YLEGEND_ANGLE,
1937 GFX_H_LEFT, GFX_V_CENTER,
1941 gfx_new_text( im->canvas,
1942 im->ximg/2, im->text_prop[TEXT_PROP_TITLE].size*1.2,
1943 im->graph_col[GRC_FONT],
1944 im->text_prop[TEXT_PROP_TITLE].font,
1945 im->text_prop[TEXT_PROP_TITLE].size, im->tabwidth, 0.0,
1946 GFX_H_CENTER, GFX_V_CENTER,
1950 if( !(im->extra_flags & NOLEGEND) & !(im->extra_flags & ONLY_GRAPH) ) {
1951 for(i=0;i<im->gdes_c;i++){
1952 if(im->gdes[i].legend[0] =='\0')
1955 /* im->gdes[i].leg_y is the bottom of the legend */
1956 X0 = im->gdes[i].leg_x;
1957 Y0 = im->gdes[i].leg_y;
1958 gfx_new_text ( im->canvas, X0, Y0,
1959 im->graph_col[GRC_FONT],
1960 im->text_prop[TEXT_PROP_LEGEND].font,
1961 im->text_prop[TEXT_PROP_LEGEND].size,
1962 im->tabwidth,0.0, GFX_H_LEFT, GFX_V_BOTTOM,
1963 im->gdes[i].legend );
1964 /* The legend for GRAPH items starts with "M " to have
1965 enough space for the box */
1966 if ( im->gdes[i].gf != GF_PRINT &&
1967 im->gdes[i].gf != GF_GPRINT &&
1968 im->gdes[i].gf != GF_COMMENT) {
1971 boxH = gfx_get_text_width(im->canvas, 0,
1972 im->text_prop[TEXT_PROP_LEGEND].font,
1973 im->text_prop[TEXT_PROP_LEGEND].size,
1974 im->tabwidth,"M", 0)*1.2;
1977 /* make sure transparent colors show up all the same */
1978 node = gfx_new_area(im->canvas,
1982 im->graph_col[GRC_CANVAS]);
1983 gfx_add_point ( node, X0+boxH, Y0-boxV );
1985 node = gfx_new_area(im->canvas,
1990 gfx_add_point ( node, X0+boxH, Y0-boxV );
1991 node = gfx_new_line(im->canvas,
1993 1,im->graph_col[GRC_FONT]);
1994 gfx_add_point(node,X0+boxH,Y0);
1995 gfx_add_point(node,X0+boxH,Y0-boxV);
1996 gfx_close_path(node);
2003 /*****************************************************
2004 * lazy check make sure we rely need to create this graph
2005 *****************************************************/
2007 int lazy_check(image_desc_t *im){
2010 struct stat imgstat;
2012 if (im->lazy == 0) return 0; /* no lazy option */
2013 if (stat(im->graphfile,&imgstat) != 0)
2014 return 0; /* can't stat */
2015 /* one pixel in the existing graph is more then what we would
2017 if (time(NULL) - imgstat.st_mtime >
2018 (im->end - im->start) / im->xsize)
2020 if ((fd = fopen(im->graphfile,"rb")) == NULL)
2021 return 0; /* the file does not exist */
2022 switch (im->canvas->imgformat) {
2024 size = PngSize(fd,&(im->ximg),&(im->yimg));
2033 #ifdef WITH_PIECHART
2035 pie_part(image_desc_t *im, gfx_color_t color,
2036 double PieCenterX, double PieCenterY, double Radius,
2037 double startangle, double endangle)
2041 double step=M_PI/50; /* Number of iterations for the circle;
2042 ** 10 is definitely too low, more than
2043 ** 50 seems to be overkill
2046 /* Strange but true: we have to work clockwise or else
2047 ** anti aliasing nor transparency don't work.
2049 ** This test is here to make sure we do it right, also
2050 ** this makes the for...next loop more easy to implement.
2051 ** The return will occur if the user enters a negative number
2052 ** (which shouldn't be done according to the specs) or if the
2053 ** programmers do something wrong (which, as we all know, never
2054 ** happens anyway :)
2056 if (endangle<startangle) return;
2058 /* Hidden feature: Radius decreases each full circle */
2060 while (angle>=2*M_PI) {
2065 node=gfx_new_area(im->canvas,
2066 PieCenterX+sin(startangle)*Radius,
2067 PieCenterY-cos(startangle)*Radius,
2070 PieCenterX+sin(endangle)*Radius,
2071 PieCenterY-cos(endangle)*Radius,
2073 for (angle=endangle;angle-startangle>=step;angle-=step) {
2075 PieCenterX+sin(angle)*Radius,
2076 PieCenterY-cos(angle)*Radius );
2083 graph_size_location(image_desc_t *im, int elements
2085 #ifdef WITH_PIECHART
2091 /* The actual size of the image to draw is determined from
2092 ** several sources. The size given on the command line is
2093 ** the graph area but we need more as we have to draw labels
2094 ** and other things outside the graph area
2097 /* +-+-------------------------------------------+
2098 ** |l|.................title.....................|
2099 ** |e+--+-------------------------------+--------+
2102 ** |l| l| main graph area | chart |
2105 ** |r+--+-------------------------------+--------+
2106 ** |e| | x-axis labels | |
2107 ** |v+--+-------------------------------+--------+
2108 ** | |..............legends......................|
2109 ** +-+-------------------------------------------+
2111 int Xvertical=0, Yvertical=0,
2112 Xtitle =0, Ytitle =0,
2115 #ifdef WITH_PIECHART
2120 Xlegend =0, Ylegend =0,
2122 Xspacing =15, Yspacing =15;
2124 if (im->extra_flags & ONLY_GRAPH) {
2126 im->ximg = im->xsize;
2127 im->yimg = im->ysize;
2128 im->yorigin = im->ysize;
2132 if (im->ylegend[0] != '\0' ) {
2133 Xvertical = im->text_prop[TEXT_PROP_UNIT].size *2;
2134 Yvertical = gfx_get_text_width(im->canvas, 0,
2135 im->text_prop[TEXT_PROP_UNIT].font,
2136 im->text_prop[TEXT_PROP_UNIT].size,
2137 im->tabwidth,im->ylegend, 0);
2141 if (im->title[0] != '\0') {
2142 /* The title is placed "inbetween" two text lines so it
2143 ** automatically has some vertical spacing. The horizontal
2144 ** spacing is added here, on each side.
2146 Xtitle = gfx_get_text_width(im->canvas, 0,
2147 im->text_prop[TEXT_PROP_TITLE].font,
2148 im->text_prop[TEXT_PROP_TITLE].size,
2150 im->title, 0) + 2*Xspacing;
2151 Ytitle = im->text_prop[TEXT_PROP_TITLE].size*2.5;
2157 if (im->draw_x_grid) {
2158 Yxlabel=im->text_prop[TEXT_PROP_AXIS].size *2.5;
2160 if (im->draw_y_grid) {
2161 Xylabel=gfx_get_text_width(im->canvas, 0,
2162 im->text_prop[TEXT_PROP_AXIS].font,
2163 im->text_prop[TEXT_PROP_AXIS].size,
2165 "0", 0) * im->unitslength + im->text_prop[TEXT_PROP_AXIS].size * 2;
2169 #ifdef WITH_PIECHART
2171 im->piesize=im->xsize<im->ysize?im->xsize:im->ysize;
2177 /* Now calculate the total size. Insert some spacing where
2178 desired. im->xorigin and im->yorigin need to correspond
2179 with the lower left corner of the main graph area or, if
2180 this one is not set, the imaginary box surrounding the
2183 /* The legend width cannot yet be determined, as a result we
2184 ** have problems adjusting the image to it. For now, we just
2185 ** forget about it at all; the legend will have to fit in the
2186 ** size already allocated.
2188 im->ximg = Xylabel + Xmain + 2 * Xspacing;
2190 #ifdef WITH_PIECHART
2194 if (Xmain) im->ximg += Xspacing;
2195 #ifdef WITH_PIECHART
2196 if (Xpie) im->ximg += Xspacing;
2199 im->xorigin = Xspacing + Xylabel;
2201 if (Xtitle > im->ximg) im->ximg = Xtitle;
2203 if (Xvertical) { /* unit description */
2204 im->ximg += Xvertical;
2205 im->xorigin += Xvertical;
2209 /* The vertical size is interesting... we need to compare
2210 ** the sum of {Ytitle, Ymain, Yxlabel, Ylegend} with Yvertical
2211 ** however we need to know {Ytitle+Ymain+Yxlabel} in order to
2212 ** start even thinking about Ylegend.
2214 ** Do it in three portions: First calculate the inner part,
2215 ** then do the legend, then adjust the total height of the img.
2218 /* reserve space for main and/or pie */
2220 im->yimg = Ymain + Yxlabel;
2222 #ifdef WITH_PIECHART
2223 if (im->yimg < Ypie) im->yimg = Ypie;
2226 im->yorigin = im->yimg - Yxlabel;
2228 /* reserve space for the title *or* some padding above the graph */
2231 im->yorigin += Ytitle;
2233 im->yimg += Yspacing;
2234 im->yorigin += Yspacing;
2236 /* reserve space for padding below the graph */
2237 im->yimg += Yspacing;
2240 /* Determine where to place the legends onto the image.
2241 ** Adjust im->yimg to match the space requirements.
2243 if(leg_place(im)==-1)
2246 /* last of three steps: check total height of image */
2247 if (im->yimg < Yvertical) im->yimg = Yvertical;
2250 if (Xlegend > im->ximg) {
2252 /* reposition Pie */
2256 #ifdef WITH_PIECHART
2257 /* The pie is placed in the upper right hand corner,
2258 ** just below the title (if any) and with sufficient
2262 im->pie_x = im->ximg - Xspacing - Xpie/2;
2263 im->pie_y = im->yorigin-Ymain+Ypie/2;
2265 im->pie_x = im->ximg/2;
2266 im->pie_y = im->yorigin-Ypie/2;
2273 /* draw that picture thing ... */
2275 graph_paint(image_desc_t *im, char ***calcpr)
2278 int lazy = lazy_check(im);
2279 #ifdef WITH_PIECHART
2281 double PieStart=0.0;
2286 double areazero = 0.0;
2287 enum gf_en stack_gf = GF_PRINT;
2288 graph_desc_t *lastgdes = NULL;
2290 /* if we are lazy and there is nothing to PRINT ... quit now */
2291 if (lazy && im->prt_c==0) return 0;
2293 /* pull the data from the rrd files ... */
2295 if(data_fetch(im)==-1)
2298 /* evaluate VDEF and CDEF operations ... */
2299 if(data_calc(im)==-1)
2302 #ifdef WITH_PIECHART
2303 /* check if we need to draw a piechart */
2304 for(i=0;i<im->gdes_c;i++){
2305 if (im->gdes[i].gf == GF_PART) {
2312 /* calculate and PRINT and GPRINT definitions. We have to do it at
2313 * this point because it will affect the length of the legends
2314 * if there are no graph elements we stop here ...
2315 * if we are lazy, try to quit ...
2317 i=print_calc(im,calcpr);
2320 #ifdef WITH_PIECHART
2323 ) || lazy) return 0;
2325 #ifdef WITH_PIECHART
2326 /* If there's only the pie chart to draw, signal this */
2327 if (i==0) piechart=2;
2330 /* get actual drawing data and find min and max values*/
2331 if(data_proc(im)==-1)
2334 if(!im->logarithmic){si_unit(im);} /* identify si magnitude Kilo, Mega Giga ? */
2336 if(!im->rigid && ! im->logarithmic)
2337 expand_range(im); /* make sure the upper and lower limit are
2340 if (!calc_horizontal_grid(im))
2347 /**************************************************************
2348 *** Calculating sizes and locations became a bit confusing ***
2349 *** so I moved this into a separate function. ***
2350 **************************************************************/
2351 if(graph_size_location(im,i
2352 #ifdef WITH_PIECHART
2358 /* the actual graph is created by going through the individual
2359 graph elements and then drawing them */
2361 node=gfx_new_area ( im->canvas,
2365 im->graph_col[GRC_BACK]);
2367 gfx_add_point(node,0, im->yimg);
2369 #ifdef WITH_PIECHART
2370 if (piechart != 2) {
2372 node=gfx_new_area ( im->canvas,
2373 im->xorigin, im->yorigin,
2374 im->xorigin + im->xsize, im->yorigin,
2375 im->xorigin + im->xsize, im->yorigin-im->ysize,
2376 im->graph_col[GRC_CANVAS]);
2378 gfx_add_point(node,im->xorigin, im->yorigin - im->ysize);
2380 if (im->minval > 0.0)
2381 areazero = im->minval;
2382 if (im->maxval < 0.0)
2383 areazero = im->maxval;
2384 #ifdef WITH_PIECHART
2388 #ifdef WITH_PIECHART
2390 pie_part(im,im->graph_col[GRC_CANVAS],im->pie_x,im->pie_y,im->piesize*0.5,0,2*M_PI);
2394 for(i=0;i<im->gdes_c;i++){
2395 switch(im->gdes[i].gf){
2408 for (ii = 0; ii < im->xsize; ii++)
2410 if (!isnan(im->gdes[i].p_data[ii]) &&
2411 im->gdes[i].p_data[ii] > 0.0)
2413 /* generate a tick */
2414 gfx_new_line(im->canvas, im -> xorigin + ii,
2415 im -> yorigin - (im -> gdes[i].yrule * im -> ysize),
2419 im -> gdes[i].col );
2425 stack_gf = im->gdes[i].gf;
2427 /* fix data points at oo and -oo */
2428 for(ii=0;ii<im->xsize;ii++){
2429 if (isinf(im->gdes[i].p_data[ii])){
2430 if (im->gdes[i].p_data[ii] > 0) {
2431 im->gdes[i].p_data[ii] = im->maxval ;
2433 im->gdes[i].p_data[ii] = im->minval ;
2439 /* *******************************************************
2444 -------|---------------------------------------
2446 if we know the value of y at time t was a then
2447 we draw a square from t-1 to t with the value a.
2449 ********************************************************* */
2450 if (im->gdes[i].col != 0x0){
2451 /* GF_LINE and friend */
2452 if(stack_gf == GF_LINE ){
2454 for(ii=1;ii<im->xsize;ii++){
2455 if (isnan(im->gdes[i].p_data[ii])){
2459 if ( node == NULL ) {
2460 node = gfx_new_line(im->canvas,
2461 ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2462 ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2463 im->gdes[i].linewidth,
2466 gfx_add_point(node,ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii]));
2467 gfx_add_point(node,ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]));
2472 for(ii=1;ii<im->xsize;ii++){
2473 /* keep things simple for now, just draw these bars
2474 do not try to build a big and complex area */
2476 if ( isnan(im->gdes[i].p_data[ii]) ) {
2479 ytop = ytr(im,im->gdes[i].p_data[ii]);
2480 if ( im->gdes[i].stack ) {
2481 ybase = ytr(im,lastgdes->p_data[ii]);
2483 ybase = ytr(im,areazero);
2485 if ( ybase == ytop ){
2488 node = gfx_new_area(im->canvas,
2489 ii-1+im->xorigin,ybase,
2490 ii-1+im->xorigin,ytop,
2491 ii+im->xorigin,ytop,
2494 gfx_add_point(node,ii+im->xorigin,ybase);
2496 } /* else GF_LINE */
2497 } /* if color != 0x0 */
2498 /* make sure we do not run into trouble when stacking on NaN */
2499 for(ii=0;ii<im->xsize;ii++){
2500 if (isnan(im->gdes[i].p_data[ii])) {
2501 if (lastgdes && (im->gdes[i].stack)) {
2502 im->gdes[i].p_data[ii] = lastgdes->p_data[ii];
2504 im->gdes[i].p_data[ii] = ytr(im,areazero);
2508 lastgdes = &(im->gdes[i]);
2510 #ifdef WITH_PIECHART
2512 if(isnan(im->gdes[i].yrule)) /* fetch variable */
2513 im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
2515 if (finite(im->gdes[i].yrule)) { /* even the fetched var can be NaN */
2516 pie_part(im,im->gdes[i].col,
2517 im->pie_x,im->pie_y,im->piesize*0.4,
2518 M_PI*2.0*PieStart/100.0,
2519 M_PI*2.0*(PieStart+im->gdes[i].yrule)/100.0);
2520 PieStart += im->gdes[i].yrule;
2527 #ifdef WITH_PIECHART
2534 if( !(im->extra_flags & ONLY_GRAPH) )
2537 /* grid_paint also does the text */
2538 if( !(im->extra_flags & ONLY_GRAPH) )
2541 /* the RULES are the last thing to paint ... */
2542 for(i=0;i<im->gdes_c;i++){
2544 switch(im->gdes[i].gf){
2546 if(isnan(im->gdes[i].yrule)) { /* fetch variable */
2547 im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
2549 if(im->gdes[i].yrule >= im->minval
2550 && im->gdes[i].yrule <= im->maxval)
2551 gfx_new_line(im->canvas,
2552 im->xorigin,ytr(im,im->gdes[i].yrule),
2553 im->xorigin+im->xsize,ytr(im,im->gdes[i].yrule),
2554 1.0,im->gdes[i].col);
2557 if(im->gdes[i].xrule == 0) { /* fetch variable */
2558 im->gdes[i].xrule = im->gdes[im->gdes[i].vidx].vf.when;
2560 if(im->gdes[i].xrule >= im->start
2561 && im->gdes[i].xrule <= im->end)
2562 gfx_new_line(im->canvas,
2563 xtr(im,im->gdes[i].xrule),im->yorigin,
2564 xtr(im,im->gdes[i].xrule),im->yorigin-im->ysize,
2565 1.0,im->gdes[i].col);
2573 if (strcmp(im->graphfile,"-")==0) {
2574 fo = im->graphhandle ? im->graphhandle : stdout;
2575 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
2576 /* Change translation mode for stdout to BINARY */
2577 _setmode( _fileno( fo ), O_BINARY );
2580 if ((fo = fopen(im->graphfile,"wb")) == NULL) {
2581 rrd_set_error("Opening '%s' for write: %s",im->graphfile,
2582 rrd_strerror(errno));
2586 gfx_render (im->canvas,im->ximg,im->yimg,0x0,fo);
2587 if (strcmp(im->graphfile,"-") != 0)
2593 /*****************************************************
2595 *****************************************************/
2598 gdes_alloc(image_desc_t *im){
2601 if ((im->gdes = (graph_desc_t *) rrd_realloc(im->gdes, (im->gdes_c)
2602 * sizeof(graph_desc_t)))==NULL){
2603 rrd_set_error("realloc graph_descs");
2608 im->gdes[im->gdes_c-1].step=im->step;
2609 im->gdes[im->gdes_c-1].stack=0;
2610 im->gdes[im->gdes_c-1].debug=0;
2611 im->gdes[im->gdes_c-1].start=im->start;
2612 im->gdes[im->gdes_c-1].end=im->end;
2613 im->gdes[im->gdes_c-1].vname[0]='\0';
2614 im->gdes[im->gdes_c-1].data=NULL;
2615 im->gdes[im->gdes_c-1].ds_namv=NULL;
2616 im->gdes[im->gdes_c-1].data_first=0;
2617 im->gdes[im->gdes_c-1].p_data=NULL;
2618 im->gdes[im->gdes_c-1].rpnp=NULL;
2619 im->gdes[im->gdes_c-1].shift=0;
2620 im->gdes[im->gdes_c-1].col = 0x0;
2621 im->gdes[im->gdes_c-1].legend[0]='\0';
2622 im->gdes[im->gdes_c-1].format[0]='\0';
2623 im->gdes[im->gdes_c-1].rrd[0]='\0';
2624 im->gdes[im->gdes_c-1].ds=-1;
2625 im->gdes[im->gdes_c-1].p_data=NULL;
2626 im->gdes[im->gdes_c-1].yrule=DNAN;
2627 im->gdes[im->gdes_c-1].xrule=0;
2631 /* copies input untill the first unescaped colon is found
2632 or until input ends. backslashes have to be escaped as well */
2634 scan_for_col(char *input, int len, char *output)
2639 input[inp] != ':' &&
2642 if (input[inp] == '\\' &&
2643 input[inp+1] != '\0' &&
2644 (input[inp+1] == '\\' ||
2645 input[inp+1] == ':')){
2646 output[outp++] = input[++inp];
2649 output[outp++] = input[inp];
2652 output[outp] = '\0';
2655 /* Some surgery done on this function, it became ridiculously big.
2657 ** - initializing now in rrd_graph_init()
2658 ** - options parsing now in rrd_graph_options()
2659 ** - script parsing now in rrd_graph_script()
2662 rrd_graph(int argc, char **argv, char ***prdata, int *xsize, int *ysize, FILE *stream, double *ymin, double *ymax)
2666 rrd_graph_init(&im);
2667 im.graphhandle = stream;
2669 rrd_graph_options(argc,argv,&im);
2670 if (rrd_test_error()) {
2675 if (strlen(argv[optind])>=MAXPATH) {
2676 rrd_set_error("filename (including path) too long");
2680 strncpy(im.graphfile,argv[optind],MAXPATH-1);
2681 im.graphfile[MAXPATH-1]='\0';
2683 rrd_graph_script(argc,argv,&im,1);
2684 if (rrd_test_error()) {
2689 /* Everything is now read and the actual work can start */
2692 if (graph_paint(&im,prdata)==-1){
2697 /* The image is generated and needs to be output.
2698 ** Also, if needed, print a line with information about the image.
2708 /* maybe prdata is not allocated yet ... lets do it now */
2709 if ((*prdata = calloc(2,sizeof(char *)))==NULL) {
2710 rrd_set_error("malloc imginfo");
2714 if(((*prdata)[0] = malloc((strlen(im.imginfo)+200+strlen(im.graphfile))*sizeof(char)))
2716 rrd_set_error("malloc imginfo");
2719 filename=im.graphfile+strlen(im.graphfile);
2720 while(filename > im.graphfile) {
2721 if (*(filename-1)=='/' || *(filename-1)=='\\' ) break;
2725 sprintf((*prdata)[0],im.imginfo,filename,(long)(im.canvas->zoom*im.ximg),(long)(im.canvas->zoom*im.yimg));
2732 rrd_graph_init(image_desc_t *im)
2739 #ifdef HAVE_SETLOCALE
2740 setlocale(LC_TIME,"");
2745 im->xlab_user.minsec = -1;
2751 im->ylegend[0] = '\0';
2752 im->title[0] = '\0';
2755 im->unitsexponent= 9999;
2762 im->logarithmic = 0;
2763 im->ygridstep = DNAN;
2764 im->draw_x_grid = 1;
2765 im->draw_y_grid = 1;
2770 im->canvas = gfx_new_canvas();
2771 im->grid_dash_on = 1;
2772 im->grid_dash_off = 1;
2773 im->tabwidth = 40.0;
2775 for(i=0;i<DIM(graph_col);i++)
2776 im->graph_col[i]=graph_col[i];
2778 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
2781 char rrd_win_default_font[1000];
2782 windir = getenv("windir");
2783 /* %windir% is something like D:\windows or C:\winnt */
2784 if (windir != NULL) {
2785 strncpy(rrd_win_default_font,windir,999);
2786 rrd_win_default_font[999] = '\0';
2787 strcat(rrd_win_default_font,"\\fonts\\cour.ttf");
2788 for(i=0;i<DIM(text_prop);i++){
2789 strncpy(text_prop[i].font,rrd_win_default_font,sizeof(text_prop[i].font)-1);
2790 text_prop[i].font[sizeof(text_prop[i].font)-1] = '\0';
2796 deffont = getenv("RRD_DEFAULT_FONT");
2797 if (deffont != NULL) {
2798 for(i=0;i<DIM(text_prop);i++){
2799 strncpy(text_prop[i].font,deffont,sizeof(text_prop[i].font)-1);
2800 text_prop[i].font[sizeof(text_prop[i].font)-1] = '\0';
2804 for(i=0;i<DIM(text_prop);i++){
2805 im->text_prop[i].size = text_prop[i].size;
2806 strcpy(im->text_prop[i].font,text_prop[i].font);
2811 rrd_graph_options(int argc, char *argv[],image_desc_t *im)
2814 char *parsetime_error = NULL;
2815 char scan_gtm[12],scan_mtm[12],scan_ltm[12],col_nam[12];
2816 time_t start_tmp=0,end_tmp=0;
2818 struct rrd_time_value start_tv, end_tv;
2821 parsetime("end-24h", &start_tv);
2822 parsetime("now", &end_tv);
2825 static struct option long_options[] =
2827 {"start", required_argument, 0, 's'},
2828 {"end", required_argument, 0, 'e'},
2829 {"x-grid", required_argument, 0, 'x'},
2830 {"y-grid", required_argument, 0, 'y'},
2831 {"vertical-label",required_argument,0,'v'},
2832 {"width", required_argument, 0, 'w'},
2833 {"height", required_argument, 0, 'h'},
2834 {"interlaced", no_argument, 0, 'i'},
2835 {"upper-limit",required_argument, 0, 'u'},
2836 {"lower-limit",required_argument, 0, 'l'},
2837 {"rigid", no_argument, 0, 'r'},
2838 {"base", required_argument, 0, 'b'},
2839 {"logarithmic",no_argument, 0, 'o'},
2840 {"color", required_argument, 0, 'c'},
2841 {"font", required_argument, 0, 'n'},
2842 {"title", required_argument, 0, 't'},
2843 {"imginfo", required_argument, 0, 'f'},
2844 {"imgformat", required_argument, 0, 'a'},
2845 {"lazy", no_argument, 0, 'z'},
2846 {"zoom", required_argument, 0, 'm'},
2847 {"no-legend", no_argument, 0, 'g'},
2848 {"force-rules-legend",no_argument,0, 'F'},
2849 {"only-graph", no_argument, 0, 'j'},
2850 {"alt-y-grid", no_argument, 0, 'Y'},
2851 {"no-minor", no_argument, 0, 'I'},
2852 {"alt-autoscale", no_argument, 0, 'A'},
2853 {"alt-autoscale-max", no_argument, 0, 'M'},
2854 {"no-gridfit", no_argument, 0, 'N'},
2855 {"units-exponent",required_argument, 0, 'X'},
2856 {"units-length",required_argument, 0, 'L'},
2857 {"step", required_argument, 0, 'S'},
2858 {"tabwidth", required_argument, 0, 'T'},
2860 int option_index = 0;
2862 int col_start,col_end;
2864 opt = getopt_long(argc, argv,
2865 "s:e:x:y:v:w:h:iu:l:rb:oc:n:m:t:f:a:I:zgjFYAMX:L:S:T:N",
2866 long_options, &option_index);
2873 im->extra_flags |= NOMINOR;
2876 im->extra_flags |= ALTYGRID;
2879 im->extra_flags |= ALTAUTOSCALE;
2882 im->extra_flags |= ALTAUTOSCALE_MAX;
2885 im->extra_flags |= ONLY_GRAPH;
2888 im->extra_flags |= NOLEGEND;
2891 im->extra_flags |= FORCE_RULES_LEGEND;
2894 im->unitsexponent = atoi(optarg);
2897 im->unitslength = atoi(optarg);
2900 im->tabwidth = atof(optarg);
2903 im->step = atoi(optarg);
2909 if ((parsetime_error = parsetime(optarg, &start_tv))) {
2910 rrd_set_error( "start time: %s", parsetime_error );
2915 if ((parsetime_error = parsetime(optarg, &end_tv))) {
2916 rrd_set_error( "end time: %s", parsetime_error );
2921 if(strcmp(optarg,"none") == 0){
2927 "%10[A-Z]:%ld:%10[A-Z]:%ld:%10[A-Z]:%ld:%ld:%n",
2929 &im->xlab_user.gridst,
2931 &im->xlab_user.mgridst,
2933 &im->xlab_user.labst,
2934 &im->xlab_user.precis,
2935 &stroff) == 7 && stroff != 0){
2936 strncpy(im->xlab_form, optarg+stroff, sizeof(im->xlab_form) - 1);
2937 im->xlab_form[sizeof(im->xlab_form)-1] = '\0';
2938 if((int)(im->xlab_user.gridtm = tmt_conv(scan_gtm)) == -1){
2939 rrd_set_error("unknown keyword %s",scan_gtm);
2941 } else if ((int)(im->xlab_user.mgridtm = tmt_conv(scan_mtm)) == -1){
2942 rrd_set_error("unknown keyword %s",scan_mtm);
2944 } else if ((int)(im->xlab_user.labtm = tmt_conv(scan_ltm)) == -1){
2945 rrd_set_error("unknown keyword %s",scan_ltm);
2948 im->xlab_user.minsec = 1;
2949 im->xlab_user.stst = im->xlab_form;
2951 rrd_set_error("invalid x-grid format");
2957 if(strcmp(optarg,"none") == 0){
2965 &im->ylabfact) == 2) {
2966 if(im->ygridstep<=0){
2967 rrd_set_error("grid step must be > 0");
2969 } else if (im->ylabfact < 1){
2970 rrd_set_error("label factor must be > 0");
2974 rrd_set_error("invalid y-grid format");
2979 strncpy(im->ylegend,optarg,150);
2980 im->ylegend[150]='\0';
2983 im->maxval = atof(optarg);
2986 im->minval = atof(optarg);
2989 im->base = atol(optarg);
2990 if(im->base != 1024 && im->base != 1000 ){
2991 rrd_set_error("the only sensible value for base apart from 1000 is 1024");
2996 long_tmp = atol(optarg);
2997 if (long_tmp < 10) {
2998 rrd_set_error("width below 10 pixels");
3001 im->xsize = long_tmp;
3004 long_tmp = atol(optarg);
3005 if (long_tmp < 10) {
3006 rrd_set_error("height below 10 pixels");
3009 im->ysize = long_tmp;
3012 im->canvas->interlaced = 1;
3018 im->imginfo = optarg;
3021 if((int)(im->canvas->imgformat = if_conv(optarg)) == -1) {
3022 rrd_set_error("unsupported graphics format '%s'",optarg);
3030 im->logarithmic = 1;
3031 if (isnan(im->minval))
3036 "%10[A-Z]#%n%8lx%n",
3037 col_nam,&col_start,&color,&col_end) == 2){
3039 int col_len = col_end - col_start;
3042 color = (color << 8) + 0xff /* shift left by 8 */;
3047 rrd_set_error("the color format is #RRGGBB[AA]");
3050 if((ci=grc_conv(col_nam)) != -1){
3051 im->graph_col[ci]=color;
3053 rrd_set_error("invalid color name '%s'",col_nam);
3057 rrd_set_error("invalid color def format");
3067 "%10[A-Z]:%lf:%1000s",
3068 prop,&size,font) == 3){
3070 if((sindex=text_prop_conv(prop)) != -1){
3071 im->text_prop[sindex].size=size;
3072 strcpy(im->text_prop[sindex].font,font);
3073 if (sindex==0) { /* the default */
3074 im->text_prop[TEXT_PROP_TITLE].size=size;
3075 strcpy(im->text_prop[TEXT_PROP_TITLE].font,font);
3076 im->text_prop[TEXT_PROP_AXIS].size=size;
3077 strcpy(im->text_prop[TEXT_PROP_AXIS].font,font);
3078 im->text_prop[TEXT_PROP_UNIT].size=size;
3079 strcpy(im->text_prop[TEXT_PROP_UNIT].font,font);
3080 im->text_prop[TEXT_PROP_LEGEND].size=size;
3081 strcpy(im->text_prop[TEXT_PROP_LEGEND].font,font);
3084 rrd_set_error("invalid fonttag '%s'",prop);
3088 rrd_set_error("invalid text property format");
3094 im->canvas->zoom = atof(optarg);
3095 if (im->canvas->zoom <= 0.0) {
3096 rrd_set_error("zoom factor must be > 0");
3101 strncpy(im->title,optarg,150);
3102 im->title[150]='\0';
3107 rrd_set_error("unknown option '%c'", optopt);
3109 rrd_set_error("unknown option '%s'",argv[optind-1]);
3114 if (optind >= argc) {
3115 rrd_set_error("missing filename");
3119 if (im->logarithmic == 1 && (im->minval <= 0 || isnan(im->minval))){
3120 rrd_set_error("for a logarithmic yaxis you must specify a lower-limit > 0");
3124 if (proc_start_end(&start_tv,&end_tv,&start_tmp,&end_tmp) == -1){
3125 /* error string is set in parsetime.c */
3129 if (start_tmp < 3600*24*365*10){
3130 rrd_set_error("the first entry to fetch should be after 1980 (%ld)",start_tmp);
3134 if (end_tmp < start_tmp) {
3135 rrd_set_error("start (%ld) should be less than end (%ld)",
3136 start_tmp, end_tmp);
3140 im->start = start_tmp;
3142 im->step = max((long)im->step, (im->end-im->start)/im->xsize);
3146 rrd_graph_check_vname(image_desc_t *im, char *varname, char *err)
3148 if ((im->gdes[im->gdes_c-1].vidx=find_var(im,varname))==-1) {
3149 rrd_set_error("Unknown variable '%s' in %s",varname,err);
3155 rrd_graph_color(image_desc_t *im, char *var, char *err, int optional)
3158 graph_desc_t *gdp=&im->gdes[im->gdes_c-1];
3160 color=strstr(var,"#");
3163 rrd_set_error("Found no color in %s",err);
3172 rest=strstr(color,":");
3180 sscanf(color,"#%6lx%n",&col,&n);
3181 col = (col << 8) + 0xff /* shift left by 8 */;
3182 if (n!=7) rrd_set_error("Color problem in %s",err);
3185 sscanf(color,"#%8lx%n",&col,&n);
3188 rrd_set_error("Color problem in %s",err);
3190 if (rrd_test_error()) return 0;
3197 int bad_format(char *fmt) {
3201 while (*ptr != '\0')
3202 if (*ptr++ == '%') {
3204 /* line cannot end with percent char */
3205 if (*ptr == '\0') return 1;
3207 /* '%s', '%S' and '%%' are allowed */
3208 if (*ptr == 's' || *ptr == 'S' || *ptr == '%') ptr++;
3210 /* or else '% 6.2lf' and such are allowed */
3213 /* optional padding character */
3214 if (*ptr == ' ' || *ptr == '+' || *ptr == '-') ptr++;
3216 /* This should take care of 'm.n' with all three optional */
3217 while (*ptr >= '0' && *ptr <= '9') ptr++;
3218 if (*ptr == '.') ptr++;
3219 while (*ptr >= '0' && *ptr <= '9') ptr++;
3221 /* Either 'le', 'lf' or 'lg' must follow here */
3222 if (*ptr++ != 'l') return 1;
3223 if (*ptr == 'e' || *ptr == 'f' || *ptr == 'g') ptr++;
3234 vdef_parse(gdes,str)
3235 struct graph_desc_t *gdes;
3238 /* A VDEF currently is either "func" or "param,func"
3239 * so the parsing is rather simple. Change if needed.
3246 sscanf(str,"%le,%29[A-Z]%n",¶m,func,&n);
3247 if (n== (int)strlen(str)) { /* matched */
3251 sscanf(str,"%29[A-Z]%n",func,&n);
3252 if (n== (int)strlen(str)) { /* matched */
3255 rrd_set_error("Unknown function string '%s' in VDEF '%s'"
3262 if (!strcmp("PERCENT",func)) gdes->vf.op = VDEF_PERCENT;
3263 else if (!strcmp("MAXIMUM",func)) gdes->vf.op = VDEF_MAXIMUM;
3264 else if (!strcmp("AVERAGE",func)) gdes->vf.op = VDEF_AVERAGE;
3265 else if (!strcmp("MINIMUM",func)) gdes->vf.op = VDEF_MINIMUM;
3266 else if (!strcmp("TOTAL", func)) gdes->vf.op = VDEF_TOTAL;
3267 else if (!strcmp("FIRST", func)) gdes->vf.op = VDEF_FIRST;
3268 else if (!strcmp("LAST", func)) gdes->vf.op = VDEF_LAST;
3270 rrd_set_error("Unknown function '%s' in VDEF '%s'\n"
3277 switch (gdes->vf.op) {
3279 if (isnan(param)) { /* no parameter given */
3280 rrd_set_error("Function '%s' needs parameter in VDEF '%s'\n"
3286 if (param>=0.0 && param<=100.0) {
3287 gdes->vf.param = param;
3288 gdes->vf.val = DNAN; /* undefined */
3289 gdes->vf.when = 0; /* undefined */
3291 rrd_set_error("Parameter '%f' out of range in VDEF '%s'\n"
3305 gdes->vf.param = DNAN;
3306 gdes->vf.val = DNAN;
3309 rrd_set_error("Function '%s' needs no parameter in VDEF '%s'\n"
3326 graph_desc_t *src,*dst;
3330 dst = &im->gdes[gdi];
3331 src = &im->gdes[dst->vidx];
3332 data = src->data + src->ds;
3333 steps = (src->end - src->start) / src->step;
3336 printf("DEBUG: start == %lu, end == %lu, %lu steps\n"
3343 switch (dst->vf.op) {
3344 case VDEF_PERCENT: {
3345 rrd_value_t * array;
3349 if ((array = malloc(steps*sizeof(double)))==NULL) {
3350 rrd_set_error("malloc VDEV_PERCENT");
3353 for (step=0;step < steps; step++) {
3354 array[step]=data[step*src->ds_cnt];
3356 qsort(array,step,sizeof(double),vdef_percent_compar);
3358 field = (steps-1)*dst->vf.param/100;
3359 dst->vf.val = array[field];
3360 dst->vf.when = 0; /* no time component */
3363 for(step=0;step<steps;step++)
3364 printf("DEBUG: %3li:%10.2f %c\n",step,array[step],step==field?'*':' ');
3370 while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3371 if (step == steps) {
3375 dst->vf.val = data[step*src->ds_cnt];
3376 dst->vf.when = src->start + (step+1)*src->step;
3378 while (step != steps) {
3379 if (finite(data[step*src->ds_cnt])) {
3380 if (data[step*src->ds_cnt] > dst->vf.val) {
3381 dst->vf.val = data[step*src->ds_cnt];
3382 dst->vf.when = src->start + (step+1)*src->step;
3389 case VDEF_AVERAGE: {
3392 for (step=0;step<steps;step++) {
3393 if (finite(data[step*src->ds_cnt])) {
3394 sum += data[step*src->ds_cnt];
3399 if (dst->vf.op == VDEF_TOTAL) {
3400 dst->vf.val = sum*src->step;
3401 dst->vf.when = cnt*src->step; /* not really "when" */
3403 dst->vf.val = sum/cnt;
3404 dst->vf.when = 0; /* no time component */
3414 while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3415 if (step == steps) {
3419 dst->vf.val = data[step*src->ds_cnt];
3420 dst->vf.when = src->start + (step+1)*src->step;
3422 while (step != steps) {
3423 if (finite(data[step*src->ds_cnt])) {
3424 if (data[step*src->ds_cnt] < dst->vf.val) {
3425 dst->vf.val = data[step*src->ds_cnt];
3426 dst->vf.when = src->start + (step+1)*src->step;
3433 /* The time value returned here is one step before the
3434 * actual time value. This is the start of the first
3438 while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3439 if (step == steps) { /* all entries were NaN */
3443 dst->vf.val = data[step*src->ds_cnt];
3444 dst->vf.when = src->start + step*src->step;
3448 /* The time value returned here is the
3449 * actual time value. This is the end of the last
3453 while (step >= 0 && isnan(data[step*src->ds_cnt])) step--;
3454 if (step < 0) { /* all entries were NaN */
3458 dst->vf.val = data[step*src->ds_cnt];
3459 dst->vf.when = src->start + (step+1)*src->step;
3466 /* NaN < -INF < finite_values < INF */
3468 vdef_percent_compar(a,b)
3471 /* Equality is not returned; this doesn't hurt except
3472 * (maybe) for a little performance.
3475 /* First catch NaN values. They are smallest */
3476 if (isnan( *(double *)a )) return -1;
3477 if (isnan( *(double *)b )) return 1;
3479 /* NaN doesn't reach this part so INF and -INF are extremes.
3480 * The sign from isinf() is compatible with the sign we return
3482 if (isinf( *(double *)a )) return isinf( *(double *)a );
3483 if (isinf( *(double *)b )) return isinf( *(double *)b );
3485 /* If we reach this, both values must be finite */
3486 if ( *(double *)a < *(double *)b ) return -1; else return 1;