1 /****************************************************************************
2 * RRDtool 1.2rc5 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 0xFF0000FF, /* arrow */
103 0x404040FF /* 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);
428 /* adjust min and max to the grid definition if there is one */
429 im->minval = (double)im->ylabfact * im->ygridstep *
430 floor(im->minval / ((double)im->ylabfact * im->ygridstep));
431 im->maxval = (double)im->ylabfact * im->ygridstep *
432 ceil(im->maxval /( (double)im->ylabfact * im->ygridstep));
436 fprintf(stderr,"SCALED Min: %6.2f Max: %6.2f Factor: %6.2f\n",
437 im->minval,im->maxval,im->magfact);
442 apply_gridfit(image_desc_t *im)
444 if (isnan(im->minval) || isnan(im->maxval))
447 if (im->logarithmic) {
448 double ya, yb, ypix, ypixfrac;
449 double log10_range = log10(im->maxval) - log10(im->minval);
450 ya = pow((double)10, floor(log10(im->minval)));
451 while (ya < im->minval)
454 return; /* don't have y=10^x gridline */
456 if (yb <= im->maxval) {
457 /* we have at least 2 y=10^x gridlines.
458 Make sure distance between them in pixels
459 are an integer by expanding im->maxval */
460 double y_pixel_delta = ytr(im, ya) - ytr(im, yb);
461 double factor = y_pixel_delta / floor(y_pixel_delta);
462 double new_log10_range = factor * log10_range;
463 double new_ymax_log10 = log10(im->minval) + new_log10_range;
464 im->maxval = pow(10, new_ymax_log10);
465 ytr(im, DNAN); /* reset precalc */
466 log10_range = log10(im->maxval) - log10(im->minval);
468 /* make sure first y=10^x gridline is located on
469 integer pixel position by moving scale slightly
470 downwards (sub-pixel movement) */
471 ypix = ytr(im, ya) + im->ysize; /* add im->ysize so it always is positive */
472 ypixfrac = ypix - floor(ypix);
473 if (ypixfrac > 0 && ypixfrac < 1) {
474 double yfrac = ypixfrac / im->ysize;
475 im->minval = pow(10, log10(im->minval) - yfrac * log10_range);
476 im->maxval = pow(10, log10(im->maxval) - yfrac * log10_range);
477 ytr(im, DNAN); /* reset precalc */
480 /* Make sure we have an integer pixel distance between
481 each minor gridline */
482 double ypos1 = ytr(im, im->minval);
483 double ypos2 = ytr(im, im->minval + im->ygrid_scale.gridstep);
484 double y_pixel_delta = ypos1 - ypos2;
485 double factor = y_pixel_delta / floor(y_pixel_delta);
486 double new_range = factor * (im->maxval - im->minval);
487 double gridstep = im->ygrid_scale.gridstep;
488 double minor_y, minor_y_px, minor_y_px_frac;
489 im->maxval = im->minval + new_range;
490 ytr(im, DNAN); /* reset precalc */
491 /* make sure first minor gridline is on integer pixel y coord */
492 minor_y = gridstep * floor(im->minval / gridstep);
493 while (minor_y < im->minval)
495 minor_y_px = ytr(im, minor_y) + im->ysize; /* ensure > 0 by adding ysize */
496 minor_y_px_frac = minor_y_px - floor(minor_y_px);
497 if (minor_y_px_frac > 0 && minor_y_px_frac < 1) {
498 double yfrac = minor_y_px_frac / im->ysize;
499 double range = im->maxval - im->minval;
500 im->minval = im->minval - yfrac * range;
501 im->maxval = im->maxval - yfrac * range;
502 ytr(im, DNAN); /* reset precalc */
504 calc_horizontal_grid(im); /* recalc with changed im->maxval */
508 /* reduce data reimplementation by Alex */
512 enum cf_en cf, /* which consolidation function ?*/
513 unsigned long cur_step, /* step the data currently is in */
514 time_t *start, /* start, end and step as requested ... */
515 time_t *end, /* ... by the application will be ... */
516 unsigned long *step, /* ... adjusted to represent reality */
517 unsigned long *ds_cnt, /* number of data sources in file */
518 rrd_value_t **data) /* two dimensional array containing the data */
520 int i,reduce_factor = ceil((double)(*step) / (double)cur_step);
521 unsigned long col,dst_row,row_cnt,start_offset,end_offset,skiprows=0;
522 rrd_value_t *srcptr,*dstptr;
524 (*step) = cur_step*reduce_factor; /* set new step size for reduced data */
527 row_cnt = ((*end)-(*start))/cur_step;
533 printf("Reducing %lu rows with factor %i time %lu to %lu, step %lu\n",
534 row_cnt,reduce_factor,*start,*end,cur_step);
535 for (col=0;col<row_cnt;col++) {
536 printf("time %10lu: ",*start+(col+1)*cur_step);
537 for (i=0;i<*ds_cnt;i++)
538 printf(" %8.2e",srcptr[*ds_cnt*col+i]);
543 /* We have to combine [reduce_factor] rows of the source
544 ** into one row for the destination. Doing this we also
545 ** need to take care to combine the correct rows. First
546 ** alter the start and end time so that they are multiples
547 ** of the new step time. We cannot reduce the amount of
548 ** time so we have to move the end towards the future and
549 ** the start towards the past.
551 end_offset = (*end) % (*step);
552 start_offset = (*start) % (*step);
554 /* If there is a start offset (which cannot be more than
555 ** one destination row), skip the appropriate number of
556 ** source rows and one destination row. The appropriate
557 ** number is what we do know (start_offset/cur_step) of
558 ** the new interval (*step/cur_step aka reduce_factor).
561 printf("start_offset: %lu end_offset: %lu\n",start_offset,end_offset);
562 printf("row_cnt before: %lu\n",row_cnt);
565 (*start) = (*start)-start_offset;
566 skiprows=reduce_factor-start_offset/cur_step;
567 srcptr+=skiprows* *ds_cnt;
568 for (col=0;col<(*ds_cnt);col++) *dstptr++ = DNAN;
572 printf("row_cnt between: %lu\n",row_cnt);
575 /* At the end we have some rows that are not going to be
576 ** used, the amount is end_offset/cur_step
579 (*end) = (*end)-end_offset+(*step);
580 skiprows = end_offset/cur_step;
584 printf("row_cnt after: %lu\n",row_cnt);
587 /* Sanity check: row_cnt should be multiple of reduce_factor */
588 /* if this gets triggered, something is REALLY WRONG ... we die immediately */
590 if (row_cnt%reduce_factor) {
591 printf("SANITY CHECK: %lu rows cannot be reduced by %i \n",
592 row_cnt,reduce_factor);
593 printf("BUG in reduce_data()\n");
597 /* Now combine reduce_factor intervals at a time
598 ** into one interval for the destination.
601 for (dst_row=0;(long int)row_cnt>=reduce_factor;dst_row++) {
602 for (col=0;col<(*ds_cnt);col++) {
603 rrd_value_t newval=DNAN;
604 unsigned long validval=0;
606 for (i=0;i<reduce_factor;i++) {
607 if (isnan(srcptr[i*(*ds_cnt)+col])) {
611 if (isnan(newval)) newval = srcptr[i*(*ds_cnt)+col];
619 newval += srcptr[i*(*ds_cnt)+col];
622 newval = min (newval,srcptr[i*(*ds_cnt)+col]);
625 /* an interval contains a failure if any subintervals contained a failure */
627 newval = max (newval,srcptr[i*(*ds_cnt)+col]);
630 newval = srcptr[i*(*ds_cnt)+col];
635 if (validval == 0){newval = DNAN;} else{
653 srcptr+=(*ds_cnt)*reduce_factor;
654 row_cnt-=reduce_factor;
656 /* If we had to alter the endtime, we didn't have enough
657 ** source rows to fill the last row. Fill it with NaN.
659 if (end_offset) for (col=0;col<(*ds_cnt);col++) *dstptr++ = DNAN;
661 row_cnt = ((*end)-(*start))/ *step;
663 printf("Done reducing. Currently %lu rows, time %lu to %lu, step %lu\n",
664 row_cnt,*start,*end,*step);
665 for (col=0;col<row_cnt;col++) {
666 printf("time %10lu: ",*start+(col+1)*(*step));
667 for (i=0;i<*ds_cnt;i++)
668 printf(" %8.2e",srcptr[*ds_cnt*col+i]);
675 /* get the data required for the graphs from the
679 data_fetch(image_desc_t *im )
684 /* pull the data from the log files ... */
685 for (i=0;i< (int)im->gdes_c;i++){
686 /* only GF_DEF elements fetch data */
687 if (im->gdes[i].gf != GF_DEF)
691 /* do we have it already ?*/
692 for (ii=0;ii<i;ii++) {
693 if (im->gdes[ii].gf != GF_DEF)
695 if ((strcmp(im->gdes[i].rrd, im->gdes[ii].rrd) == 0)
696 && (im->gdes[i].cf == im->gdes[ii].cf)
697 && (im->gdes[i].cf_reduce == im->gdes[ii].cf_reduce)
698 && (im->gdes[i].start == im->gdes[ii].start)
699 && (im->gdes[i].end == im->gdes[ii].end)
700 && (im->gdes[i].step == im->gdes[ii].step)) {
701 /* OK, the data is already there.
702 ** Just copy the header portion
704 im->gdes[i].start = im->gdes[ii].start;
705 im->gdes[i].end = im->gdes[ii].end;
706 im->gdes[i].step = im->gdes[ii].step;
707 im->gdes[i].ds_cnt = im->gdes[ii].ds_cnt;
708 im->gdes[i].ds_namv = im->gdes[ii].ds_namv;
709 im->gdes[i].data = im->gdes[ii].data;
710 im->gdes[i].data_first = 0;
717 unsigned long ft_step = im->gdes[i].step ;
719 if((rrd_fetch_fn(im->gdes[i].rrd,
725 &im->gdes[i].ds_namv,
726 &im->gdes[i].data)) == -1){
729 im->gdes[i].data_first = 1;
730 im->gdes[i].step = im->step;
732 if (ft_step < im->gdes[i].step) {
733 reduce_data(im->gdes[i].cf_reduce,
741 im->gdes[i].step = ft_step;
745 /* lets see if the required data source is really there */
746 for(ii=0;ii<(int)im->gdes[i].ds_cnt;ii++){
747 if(strcmp(im->gdes[i].ds_namv[ii],im->gdes[i].ds_nam) == 0){
750 if (im->gdes[i].ds== -1){
751 rrd_set_error("No DS called '%s' in '%s'",
752 im->gdes[i].ds_nam,im->gdes[i].rrd);
760 /* evaluate the expressions in the CDEF functions */
762 /*************************************************************
764 *************************************************************/
767 find_var_wrapper(void *arg1, char *key)
769 return find_var((image_desc_t *) arg1, key);
772 /* find gdes containing var*/
774 find_var(image_desc_t *im, char *key){
776 for(ii=0;ii<im->gdes_c-1;ii++){
777 if((im->gdes[ii].gf == GF_DEF
778 || im->gdes[ii].gf == GF_VDEF
779 || im->gdes[ii].gf == GF_CDEF)
780 && (strcmp(im->gdes[ii].vname,key) == 0)){
787 /* find the largest common denominator for all the numbers
788 in the 0 terminated num array */
793 for (i=0;num[i+1]!=0;i++){
795 rest=num[i] % num[i+1];
796 num[i]=num[i+1]; num[i+1]=rest;
800 /* return i==0?num[i]:num[i-1]; */
804 /* run the rpn calculator on all the VDEF and CDEF arguments */
806 data_calc( image_desc_t *im){
810 long *steparray, rpi;
815 rpnstack_init(&rpnstack);
817 for (gdi=0;gdi<im->gdes_c;gdi++){
818 /* Look for GF_VDEF and GF_CDEF in the same loop,
819 * so CDEFs can use VDEFs and vice versa
821 switch (im->gdes[gdi].gf) {
825 graph_desc_t *vdp = &im->gdes[im->gdes[gdi].vidx];
827 /* remove current shift */
828 vdp->start -= vdp->shift;
829 vdp->end -= vdp->shift;
832 if (im->gdes[gdi].shidx >= 0)
833 vdp->shift = im->gdes[im->gdes[gdi].shidx].vf.val;
836 vdp->shift = im->gdes[gdi].shval;
838 /* normalize shift to multiple of consolidated step */
839 vdp->shift = (vdp->shift / (long)vdp->step) * (long)vdp->step;
842 vdp->start += vdp->shift;
843 vdp->end += vdp->shift;
847 /* A VDEF has no DS. This also signals other parts
848 * of rrdtool that this is a VDEF value, not a CDEF.
850 im->gdes[gdi].ds_cnt = 0;
851 if (vdef_calc(im,gdi)) {
852 rrd_set_error("Error processing VDEF '%s'"
855 rpnstack_free(&rpnstack);
860 im->gdes[gdi].ds_cnt = 1;
861 im->gdes[gdi].ds = 0;
862 im->gdes[gdi].data_first = 1;
863 im->gdes[gdi].start = 0;
864 im->gdes[gdi].end = 0;
869 /* Find the variables in the expression.
870 * - VDEF variables are substituted by their values
871 * and the opcode is changed into OP_NUMBER.
872 * - CDEF variables are analized for their step size,
873 * the lowest common denominator of all the step
874 * sizes of the data sources involved is calculated
875 * and the resulting number is the step size for the
876 * resulting data source.
878 for(rpi=0;im->gdes[gdi].rpnp[rpi].op != OP_END;rpi++){
879 if(im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
880 im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER){
881 long ptr = im->gdes[gdi].rpnp[rpi].ptr;
882 if (im->gdes[ptr].ds_cnt == 0) {
884 printf("DEBUG: inside CDEF '%s' processing VDEF '%s'\n",
886 im->gdes[ptr].vname);
887 printf("DEBUG: value from vdef is %f\n",im->gdes[ptr].vf.val);
889 im->gdes[gdi].rpnp[rpi].val = im->gdes[ptr].vf.val;
890 im->gdes[gdi].rpnp[rpi].op = OP_NUMBER;
893 rrd_realloc(steparray,
894 (++stepcnt+1)*sizeof(*steparray)))==NULL){
895 rrd_set_error("realloc steparray");
896 rpnstack_free(&rpnstack);
900 steparray[stepcnt-1] = im->gdes[ptr].step;
902 /* adjust start and end of cdef (gdi) so
903 * that it runs from the latest start point
904 * to the earliest endpoint of any of the
905 * rras involved (ptr)
907 if(im->gdes[gdi].start < im->gdes[ptr].start)
908 im->gdes[gdi].start = im->gdes[ptr].start;
910 if(im->gdes[gdi].end == 0 ||
911 im->gdes[gdi].end > im->gdes[ptr].end)
912 im->gdes[gdi].end = im->gdes[ptr].end;
914 /* store pointer to the first element of
915 * the rra providing data for variable,
916 * further save step size and data source
919 im->gdes[gdi].rpnp[rpi].data = im->gdes[ptr].data + im->gdes[ptr].ds;
920 im->gdes[gdi].rpnp[rpi].step = im->gdes[ptr].step;
921 im->gdes[gdi].rpnp[rpi].ds_cnt = im->gdes[ptr].ds_cnt;
923 /* backoff the *.data ptr; this is done so
924 * rpncalc() function doesn't have to treat
925 * the first case differently
927 } /* if ds_cnt != 0 */
928 } /* if OP_VARIABLE */
929 } /* loop through all rpi */
931 /* move the data pointers to the correct period */
932 for(rpi=0;im->gdes[gdi].rpnp[rpi].op != OP_END;rpi++){
933 if(im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
934 im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER){
935 long ptr = im->gdes[gdi].rpnp[rpi].ptr;
936 long diff = im->gdes[gdi].start - im->gdes[ptr].start;
939 im->gdes[gdi].rpnp[rpi].data += (diff / im->gdes[ptr].step) * im->gdes[ptr].ds_cnt;
943 if(steparray == NULL){
944 rrd_set_error("rpn expressions without DEF"
945 " or CDEF variables are not supported");
946 rpnstack_free(&rpnstack);
949 steparray[stepcnt]=0;
950 /* Now find the resulting step. All steps in all
951 * used RRAs have to be visited
953 im->gdes[gdi].step = lcd(steparray);
955 if((im->gdes[gdi].data = malloc((
956 (im->gdes[gdi].end-im->gdes[gdi].start)
957 / im->gdes[gdi].step)
958 * sizeof(double)))==NULL){
959 rrd_set_error("malloc im->gdes[gdi].data");
960 rpnstack_free(&rpnstack);
964 /* Step through the new cdef results array and
965 * calculate the values
967 for (now = im->gdes[gdi].start + im->gdes[gdi].step;
968 now<=im->gdes[gdi].end;
969 now += im->gdes[gdi].step)
971 rpnp_t *rpnp = im -> gdes[gdi].rpnp;
973 /* 3rd arg of rpn_calc is for OP_VARIABLE lookups;
974 * in this case we are advancing by timesteps;
975 * we use the fact that time_t is a synonym for long
977 if (rpn_calc(rpnp,&rpnstack,(long) now,
978 im->gdes[gdi].data,++dataidx) == -1) {
979 /* rpn_calc sets the error string */
980 rpnstack_free(&rpnstack);
983 } /* enumerate over time steps within a CDEF */
988 } /* enumerate over CDEFs */
989 rpnstack_free(&rpnstack);
993 /* massage data so, that we get one value for each x coordinate in the graph */
995 data_proc( image_desc_t *im ){
997 double pixstep = (double)(im->end-im->start)
998 /(double)im->xsize; /* how much time
999 passes in one pixel */
1001 double minval=DNAN,maxval=DNAN;
1003 unsigned long gr_time;
1005 /* memory for the processed data */
1006 for(i=0;i<im->gdes_c;i++) {
1007 if((im->gdes[i].gf==GF_LINE) ||
1008 (im->gdes[i].gf==GF_AREA) ||
1009 (im->gdes[i].gf==GF_TICK) ||
1010 (im->gdes[i].gf==GF_STACK)) {
1011 if((im->gdes[i].p_data = malloc((im->xsize +1)
1012 * sizeof(rrd_value_t)))==NULL){
1013 rrd_set_error("malloc data_proc");
1019 for (i=0;i<im->xsize;i++) { /* for each pixel */
1021 gr_time = im->start+pixstep*i; /* time of the current step */
1024 for (ii=0;ii<im->gdes_c;ii++) {
1026 switch (im->gdes[ii].gf) {
1030 if (!im->gdes[ii].stack)
1033 value = im->gdes[ii].yrule;
1034 if (isnan(value) || (im->gdes[ii].gf == GF_TICK)) {
1035 /* The time of the data doesn't necessarily match
1036 ** the time of the graph. Beware.
1038 vidx = im->gdes[ii].vidx;
1039 if (im->gdes[vidx].gf == GF_VDEF) {
1040 value = im->gdes[vidx].vf.val;
1041 } else if (((long int)gr_time >= (long int)im->gdes[vidx].start) &&
1042 ((long int)gr_time <= (long int)im->gdes[vidx].end) ) {
1043 value = im->gdes[vidx].data[
1044 (unsigned long) floor(
1045 (double)(gr_time - im->gdes[vidx].start)
1046 / im->gdes[vidx].step)
1047 * im->gdes[vidx].ds_cnt
1055 if (! isnan(value)) {
1057 im->gdes[ii].p_data[i] = paintval;
1058 /* GF_TICK: the data values are not
1059 ** relevant for min and max
1061 if (finite(paintval) && im->gdes[ii].gf != GF_TICK ) {
1062 if (isnan(minval) || paintval < minval)
1064 if (isnan(maxval) || paintval > maxval)
1068 im->gdes[ii].p_data[i] = DNAN;
1077 /* if min or max have not been asigned a value this is because
1078 there was no data in the graph ... this is not good ...
1079 lets set these to dummy values then ... */
1081 if (isnan(minval)) minval = 0.0;
1082 if (isnan(maxval)) maxval = 1.0;
1084 /* adjust min and max values */
1085 if (isnan(im->minval)
1086 /* don't adjust low-end with log scale */
1087 || ((!im->logarithmic && !im->rigid) && im->minval > minval)
1089 im->minval = minval;
1090 if (isnan(im->maxval)
1091 || (!im->rigid && im->maxval < maxval)
1093 if (im->logarithmic)
1094 im->maxval = maxval * 1.1;
1096 im->maxval = maxval;
1098 /* make sure min is smaller than max */
1099 if (im->minval > im->maxval) {
1100 im->minval = 0.99 * im->maxval;
1103 /* make sure min and max are not equal */
1104 if (im->minval == im->maxval) {
1106 if (! im->logarithmic) {
1109 /* make sure min and max are not both zero */
1110 if (im->maxval == 0.0) {
1119 /* identify the point where the first gridline, label ... gets placed */
1123 time_t start, /* what is the initial time */
1124 enum tmt_en baseint, /* what is the basic interval */
1125 long basestep /* how many if these do we jump a time */
1129 localtime_r(&start, &tm);
1132 tm.tm_sec -= tm.tm_sec % basestep; break;
1135 tm.tm_min -= tm.tm_min % basestep;
1140 tm.tm_hour -= tm.tm_hour % basestep; break;
1142 /* we do NOT look at the basestep for this ... */
1145 tm.tm_hour = 0; break;
1147 /* we do NOT look at the basestep for this ... */
1151 tm.tm_mday -= tm.tm_wday -1; /* -1 because we want the monday */
1152 if (tm.tm_wday==0) tm.tm_mday -= 7; /* we want the *previous* monday */
1159 tm.tm_mon -= tm.tm_mon % basestep; break;
1167 tm.tm_year -= (tm.tm_year+1900) % basestep;
1172 /* identify the point where the next gridline, label ... gets placed */
1175 time_t current, /* what is the initial time */
1176 enum tmt_en baseint, /* what is the basic interval */
1177 long basestep /* how many if these do we jump a time */
1182 localtime_r(¤t, &tm);
1186 tm.tm_sec += basestep; break;
1188 tm.tm_min += basestep; break;
1190 tm.tm_hour += basestep; break;
1192 tm.tm_mday += basestep; break;
1194 tm.tm_mday += 7*basestep; break;
1196 tm.tm_mon += basestep; break;
1198 tm.tm_year += basestep;
1200 madetime = mktime(&tm);
1201 } while (madetime == -1); /* this is necessary to skip impssible times
1202 like the daylight saving time skips */
1208 /* calculate values required for PRINT and GPRINT functions */
1211 print_calc(image_desc_t *im, char ***prdata)
1213 long i,ii,validsteps;
1216 int graphelement = 0;
1219 double magfact = -1;
1223 if (im->imginfo) prlines++;
1224 for(i=0;i<im->gdes_c;i++){
1225 switch(im->gdes[i].gf){
1228 if(((*prdata) = rrd_realloc((*prdata),prlines*sizeof(char *)))==NULL){
1229 rrd_set_error("realloc prdata");
1233 /* PRINT and GPRINT can now print VDEF generated values.
1234 * There's no need to do any calculations on them as these
1235 * calculations were already made.
1237 vidx = im->gdes[i].vidx;
1238 if (im->gdes[vidx].gf==GF_VDEF) { /* simply use vals */
1239 printval = im->gdes[vidx].vf.val;
1240 printtime = im->gdes[vidx].vf.when;
1241 } else { /* need to calculate max,min,avg etcetera */
1242 max_ii =((im->gdes[vidx].end
1243 - im->gdes[vidx].start)
1244 / im->gdes[vidx].step
1245 * im->gdes[vidx].ds_cnt);
1248 for( ii=im->gdes[vidx].ds;
1250 ii+=im->gdes[vidx].ds_cnt){
1251 if (! finite(im->gdes[vidx].data[ii]))
1253 if (isnan(printval)){
1254 printval = im->gdes[vidx].data[ii];
1259 switch (im->gdes[i].cf){
1262 case CF_DEVSEASONAL:
1266 printval += im->gdes[vidx].data[ii];
1269 printval = min( printval, im->gdes[vidx].data[ii]);
1273 printval = max( printval, im->gdes[vidx].data[ii]);
1276 printval = im->gdes[vidx].data[ii];
1279 if (im->gdes[i].cf==CF_AVERAGE || im->gdes[i].cf > CF_LAST) {
1280 if (validsteps > 1) {
1281 printval = (printval / validsteps);
1284 } /* prepare printval */
1286 if (!strcmp(im->gdes[i].format,"%c")) { /* VDEF time print */
1287 char ctime_buf[128]; /* PS: for ctime_r, must be >= 26 chars */
1288 if (im->gdes[i].gf == GF_PRINT){
1289 (*prdata)[prlines-2] = malloc((FMT_LEG_LEN+2)*sizeof(char));
1290 sprintf((*prdata)[prlines-2],"%s (%lu)",
1291 ctime_r(&printtime,ctime_buf),printtime);
1292 (*prdata)[prlines-1] = NULL;
1294 sprintf(im->gdes[i].legend,"%s (%lu)",
1295 ctime_r(&printtime,ctime_buf),printtime);
1299 if ((percent_s = strstr(im->gdes[i].format,"%S")) != NULL) {
1300 /* Magfact is set to -1 upon entry to print_calc. If it
1301 * is still less than 0, then we need to run auto_scale.
1302 * Otherwise, put the value into the correct units. If
1303 * the value is 0, then do not set the symbol or magnification
1304 * so next the calculation will be performed again. */
1305 if (magfact < 0.0) {
1306 auto_scale(im,&printval,&si_symb,&magfact);
1307 if (printval == 0.0)
1310 printval /= magfact;
1312 *(++percent_s) = 's';
1313 } else if (strstr(im->gdes[i].format,"%s") != NULL) {
1314 auto_scale(im,&printval,&si_symb,&magfact);
1317 if (im->gdes[i].gf == GF_PRINT){
1318 (*prdata)[prlines-2] = malloc((FMT_LEG_LEN+2)*sizeof(char));
1319 (*prdata)[prlines-1] = NULL;
1320 if (bad_format(im->gdes[i].format)) {
1321 rrd_set_error("bad format for PRINT in '%s'", im->gdes[i].format);
1324 #ifdef HAVE_SNPRINTF
1325 snprintf((*prdata)[prlines-2],FMT_LEG_LEN,im->gdes[i].format,printval,si_symb);
1327 sprintf((*prdata)[prlines-2],im->gdes[i].format,printval,si_symb);
1332 if (bad_format(im->gdes[i].format)) {
1333 rrd_set_error("bad format for GPRINT in '%s'", im->gdes[i].format);
1336 #ifdef HAVE_SNPRINTF
1337 snprintf(im->gdes[i].legend,FMT_LEG_LEN-2,im->gdes[i].format,printval,si_symb);
1339 sprintf(im->gdes[i].legend,im->gdes[i].format,printval,si_symb);
1357 #ifdef WITH_PIECHART
1365 return graphelement;
1369 /* place legends with color spots */
1371 leg_place(image_desc_t *im)
1374 int interleg = im->text_prop[TEXT_PROP_LEGEND].size*2.0;
1375 int border = im->text_prop[TEXT_PROP_LEGEND].size*2.0;
1376 int fill=0, fill_last;
1378 int leg_x = border, leg_y = im->yimg;
1382 char prt_fctn; /*special printfunctions */
1385 if( !(im->extra_flags & NOLEGEND) & !(im->extra_flags & ONLY_GRAPH) ) {
1386 if ((legspace = malloc(im->gdes_c*sizeof(int)))==NULL){
1387 rrd_set_error("malloc for legspace");
1391 for(i=0;i<im->gdes_c;i++){
1394 /* hid legends for rules which are not displayed */
1396 if(!(im->extra_flags & FORCE_RULES_LEGEND)) {
1397 if (im->gdes[i].gf == GF_HRULE &&
1398 (im->gdes[i].yrule < im->minval || im->gdes[i].yrule > im->maxval))
1399 im->gdes[i].legend[0] = '\0';
1401 if (im->gdes[i].gf == GF_VRULE &&
1402 (im->gdes[i].xrule < im->start || im->gdes[i].xrule > im->end))
1403 im->gdes[i].legend[0] = '\0';
1406 leg_cc = strlen(im->gdes[i].legend);
1408 /* is there a controle code ant the end of the legend string ? */
1409 /* and it is not a tab \\t */
1410 if (leg_cc >= 2 && im->gdes[i].legend[leg_cc-2] == '\\' && im->gdes[i].legend[leg_cc-1] != 't') {
1411 prt_fctn = im->gdes[i].legend[leg_cc-1];
1413 im->gdes[i].legend[leg_cc] = '\0';
1417 /* remove exess space */
1418 while (prt_fctn=='g' &&
1420 im->gdes[i].legend[leg_cc-1]==' '){
1422 im->gdes[i].legend[leg_cc]='\0';
1425 legspace[i]=(prt_fctn=='g' ? 0 : interleg);
1428 /* no interleg space if string ends in \g */
1429 fill += legspace[i];
1431 fill += gfx_get_text_width(im->canvas, fill+border,
1432 im->text_prop[TEXT_PROP_LEGEND].font,
1433 im->text_prop[TEXT_PROP_LEGEND].size,
1435 im->gdes[i].legend, 0);
1440 /* who said there was a special tag ... ?*/
1441 if (prt_fctn=='g') {
1444 if (prt_fctn == '\0') {
1445 if (i == im->gdes_c -1 ) prt_fctn ='l';
1447 /* is it time to place the legends ? */
1448 if (fill > im->ximg - 2*border){
1463 if (prt_fctn != '\0'){
1465 if (leg_c >= 2 && prt_fctn == 'j') {
1466 glue = (im->ximg - fill - 2* border) / (leg_c-1);
1470 if (prt_fctn =='c') leg_x = (im->ximg - fill) / 2.0;
1471 if (prt_fctn =='r') leg_x = im->ximg - fill - border;
1473 for(ii=mark;ii<=i;ii++){
1474 if(im->gdes[ii].legend[0]=='\0')
1475 continue; /* skip empty legends */
1476 im->gdes[ii].leg_x = leg_x;
1477 im->gdes[ii].leg_y = leg_y;
1479 gfx_get_text_width(im->canvas, leg_x,
1480 im->text_prop[TEXT_PROP_LEGEND].font,
1481 im->text_prop[TEXT_PROP_LEGEND].size,
1483 im->gdes[ii].legend, 0)
1487 leg_y += im->text_prop[TEXT_PROP_LEGEND].size*1.7;
1488 if (prt_fctn == 's') leg_y -= im->text_prop[TEXT_PROP_LEGEND].size;
1500 /* create a grid on the graph. it determines what to do
1501 from the values of xsize, start and end */
1503 /* the xaxis labels are determined from the number of seconds per pixel
1504 in the requested graph */
1509 calc_horizontal_grid(image_desc_t *im)
1515 int decimals, fractionals;
1517 im->ygrid_scale.labfact=2;
1519 range = im->maxval - im->minval;
1520 scaledrange = range / im->magfact;
1522 /* does the scale of this graph make it impossible to put lines
1523 on it? If so, give up. */
1524 if (isnan(scaledrange)) {
1528 /* find grid spaceing */
1530 if(isnan(im->ygridstep)){
1531 if(im->extra_flags & ALTYGRID) {
1532 /* find the value with max number of digits. Get number of digits */
1533 decimals = ceil(log10(max(fabs(im->maxval), fabs(im->minval))));
1534 if(decimals <= 0) /* everything is small. make place for zero */
1537 fractionals = floor(log10(range));
1538 if(fractionals < 0) /* small amplitude. */
1539 sprintf(im->ygrid_scale.labfmt, "%%%d.%df", decimals - fractionals + 1, -fractionals + 1);
1541 sprintf(im->ygrid_scale.labfmt, "%%%d.1f", decimals + 1);
1542 im->ygrid_scale.gridstep = pow((double)10, (double)fractionals);
1543 if(im->ygrid_scale.gridstep == 0) /* range is one -> 0.1 is reasonable scale */
1544 im->ygrid_scale.gridstep = 0.1;
1545 /* should have at least 5 lines but no more then 15 */
1546 if(range/im->ygrid_scale.gridstep < 5)
1547 im->ygrid_scale.gridstep /= 10;
1548 if(range/im->ygrid_scale.gridstep > 15)
1549 im->ygrid_scale.gridstep *= 10;
1550 if(range/im->ygrid_scale.gridstep > 5) {
1551 im->ygrid_scale.labfact = 1;
1552 if(range/im->ygrid_scale.gridstep > 8)
1553 im->ygrid_scale.labfact = 2;
1556 im->ygrid_scale.gridstep /= 5;
1557 im->ygrid_scale.labfact = 5;
1561 for(i=0;ylab[i].grid > 0;i++){
1562 pixel = im->ysize / (scaledrange / ylab[i].grid);
1563 if (gridind == -1 && pixel > 5) {
1570 if (pixel * ylab[gridind].lfac[i] >= 2 * im->text_prop[TEXT_PROP_AXIS].size) {
1571 im->ygrid_scale.labfact = ylab[gridind].lfac[i];
1576 im->ygrid_scale.gridstep = ylab[gridind].grid * im->magfact;
1579 im->ygrid_scale.gridstep = im->ygridstep;
1580 im->ygrid_scale.labfact = im->ylabfact;
1585 int draw_horizontal_grid(image_desc_t *im)
1589 char graph_label[100];
1590 double X0=im->xorigin;
1591 double X1=im->xorigin+im->xsize;
1593 int sgrid = (int)( im->minval / im->ygrid_scale.gridstep - 1);
1594 int egrid = (int)( im->maxval / im->ygrid_scale.gridstep + 1);
1595 scaledstep = im->ygrid_scale.gridstep/im->magfact;
1596 for (i = sgrid; i <= egrid; i++){
1597 double Y0=ytr(im,im->ygrid_scale.gridstep*i);
1598 if ( Y0 >= im->yorigin-im->ysize
1599 && Y0 <= im->yorigin){
1600 if(i % im->ygrid_scale.labfact == 0){
1601 if (i==0 || im->symbol == ' ') {
1603 if(im->extra_flags & ALTYGRID) {
1604 sprintf(graph_label,im->ygrid_scale.labfmt,scaledstep*i);
1607 sprintf(graph_label,"%4.1f",scaledstep*i);
1610 sprintf(graph_label,"%4.0f",scaledstep*i);
1614 sprintf(graph_label,"%4.1f %c",scaledstep*i, im->symbol);
1616 sprintf(graph_label,"%4.0f %c",scaledstep*i, im->symbol);
1620 gfx_new_text ( im->canvas,
1621 X0-im->text_prop[TEXT_PROP_AXIS].size/1.5, Y0,
1622 im->graph_col[GRC_FONT],
1623 im->text_prop[TEXT_PROP_AXIS].font,
1624 im->text_prop[TEXT_PROP_AXIS].size,
1625 im->tabwidth, 0.0, GFX_H_RIGHT, GFX_V_CENTER,
1627 gfx_new_dashed_line ( im->canvas,
1630 MGRIDWIDTH, im->graph_col[GRC_MGRID],
1631 im->grid_dash_on, im->grid_dash_off);
1633 } else if (!(im->extra_flags & NOMINOR)) {
1634 gfx_new_dashed_line ( im->canvas,
1637 GRIDWIDTH, im->graph_col[GRC_GRID],
1638 im->grid_dash_on, im->grid_dash_off);
1646 /* logaritmic horizontal grid */
1648 horizontal_log_grid(image_desc_t *im)
1652 int minoridx=0, majoridx=0;
1653 char graph_label[100];
1655 double value, pixperstep, minstep;
1657 /* find grid spaceing */
1658 pixpex= (double)im->ysize / (log10(im->maxval) - log10(im->minval));
1660 if (isnan(pixpex)) {
1664 for(i=0;yloglab[i][0] > 0;i++){
1665 minstep = log10(yloglab[i][0]);
1666 for(ii=1;yloglab[i][ii+1] > 0;ii++){
1667 if(yloglab[i][ii+2]==0){
1668 minstep = log10(yloglab[i][ii+1])-log10(yloglab[i][ii]);
1672 pixperstep = pixpex * minstep;
1673 if(pixperstep > 5){minoridx = i;}
1674 if(pixperstep > 2 * im->text_prop[TEXT_PROP_LEGEND].size){majoridx = i;}
1678 X1=im->xorigin+im->xsize;
1679 /* paint minor grid */
1680 for (value = pow((double)10, log10(im->minval)
1681 - fmod(log10(im->minval),log10(yloglab[minoridx][0])));
1682 value <= im->maxval;
1683 value *= yloglab[minoridx][0]){
1684 if (value < im->minval) continue;
1686 while(yloglab[minoridx][++i] > 0){
1687 Y0 = ytr(im,value * yloglab[minoridx][i]);
1688 if (Y0 <= im->yorigin - im->ysize) break;
1689 gfx_new_dashed_line ( im->canvas,
1692 GRIDWIDTH, im->graph_col[GRC_GRID],
1693 im->grid_dash_on, im->grid_dash_off);
1697 /* paint major grid and labels*/
1698 for (value = pow((double)10, log10(im->minval)
1699 - fmod(log10(im->minval),log10(yloglab[majoridx][0])));
1700 value <= im->maxval;
1701 value *= yloglab[majoridx][0]){
1702 if (value < im->minval) continue;
1704 while(yloglab[majoridx][++i] > 0){
1705 Y0 = ytr(im,value * yloglab[majoridx][i]);
1706 if (Y0 <= im->yorigin - im->ysize) break;
1707 gfx_new_dashed_line ( im->canvas,
1710 MGRIDWIDTH, im->graph_col[GRC_MGRID],
1711 im->grid_dash_on, im->grid_dash_off);
1713 sprintf(graph_label,"%3.0e",value * yloglab[majoridx][i]);
1714 gfx_new_text ( im->canvas,
1715 X0-im->text_prop[TEXT_PROP_AXIS].size/1.5, Y0,
1716 im->graph_col[GRC_FONT],
1717 im->text_prop[TEXT_PROP_AXIS].font,
1718 im->text_prop[TEXT_PROP_AXIS].size,
1719 im->tabwidth,0.0, GFX_H_RIGHT, GFX_V_CENTER,
1731 int xlab_sel; /* which sort of label and grid ? */
1732 time_t ti, tilab, timajor;
1734 char graph_label[100];
1735 double X0,Y0,Y1; /* points for filled graph and more*/
1738 /* the type of time grid is determined by finding
1739 the number of seconds per pixel in the graph */
1742 if(im->xlab_user.minsec == -1){
1743 factor=(im->end - im->start)/im->xsize;
1745 while ( xlab[xlab_sel+1].minsec != -1
1746 && xlab[xlab_sel+1].minsec <= factor){ xlab_sel++; }
1747 im->xlab_user.gridtm = xlab[xlab_sel].gridtm;
1748 im->xlab_user.gridst = xlab[xlab_sel].gridst;
1749 im->xlab_user.mgridtm = xlab[xlab_sel].mgridtm;
1750 im->xlab_user.mgridst = xlab[xlab_sel].mgridst;
1751 im->xlab_user.labtm = xlab[xlab_sel].labtm;
1752 im->xlab_user.labst = xlab[xlab_sel].labst;
1753 im->xlab_user.precis = xlab[xlab_sel].precis;
1754 im->xlab_user.stst = xlab[xlab_sel].stst;
1757 /* y coords are the same for every line ... */
1759 Y1 = im->yorigin-im->ysize;
1762 /* paint the minor grid */
1763 if (!(im->extra_flags & NOMINOR))
1765 for(ti = find_first_time(im->start,
1766 im->xlab_user.gridtm,
1767 im->xlab_user.gridst),
1768 timajor = find_first_time(im->start,
1769 im->xlab_user.mgridtm,
1770 im->xlab_user.mgridst);
1772 ti = find_next_time(ti,im->xlab_user.gridtm,im->xlab_user.gridst)
1774 /* are we inside the graph ? */
1775 if (ti < im->start || ti > im->end) continue;
1776 while (timajor < ti) {
1777 timajor = find_next_time(timajor,
1778 im->xlab_user.mgridtm, im->xlab_user.mgridst);
1780 if (ti == timajor) continue; /* skip as falls on major grid line */
1782 gfx_new_dashed_line(im->canvas,X0,Y0+1, X0,Y1-1,GRIDWIDTH,
1783 im->graph_col[GRC_GRID],
1784 im->grid_dash_on, im->grid_dash_off);
1789 /* paint the major grid */
1790 for(ti = find_first_time(im->start,
1791 im->xlab_user.mgridtm,
1792 im->xlab_user.mgridst);
1794 ti = find_next_time(ti,im->xlab_user.mgridtm,im->xlab_user.mgridst)
1796 /* are we inside the graph ? */
1797 if (ti < im->start || ti > im->end) continue;
1799 gfx_new_dashed_line(im->canvas,X0,Y0+3, X0,Y1-2,MGRIDWIDTH,
1800 im->graph_col[GRC_MGRID],
1801 im->grid_dash_on, im->grid_dash_off);
1804 /* paint the labels below the graph */
1805 for(ti = find_first_time(im->start - im->xlab_user.precis/2,
1806 im->xlab_user.labtm,
1807 im->xlab_user.labst);
1808 ti <= im->end - im->xlab_user.precis/2;
1809 ti = find_next_time(ti,im->xlab_user.labtm,im->xlab_user.labst)
1811 tilab= ti + im->xlab_user.precis/2; /* correct time for the label */
1812 /* are we inside the graph ? */
1813 if (tilab < im->start || tilab > im->end) continue;
1816 localtime_r(&tilab, &tm);
1817 strftime(graph_label,99,im->xlab_user.stst, &tm);
1819 # error "your libc has no strftime I guess we'll abort the exercise here."
1821 gfx_new_text ( im->canvas,
1822 xtr(im,tilab), Y0+im->text_prop[TEXT_PROP_AXIS].size/1.5,
1823 im->graph_col[GRC_FONT],
1824 im->text_prop[TEXT_PROP_AXIS].font,
1825 im->text_prop[TEXT_PROP_AXIS].size,
1826 im->tabwidth, 0.0, GFX_H_CENTER, GFX_V_TOP,
1839 /* draw x and y axis */
1840 /* gfx_new_line ( im->canvas, im->xorigin+im->xsize,im->yorigin,
1841 im->xorigin+im->xsize,im->yorigin-im->ysize,
1842 GRIDWIDTH, im->graph_col[GRC_AXIS]);
1844 gfx_new_line ( im->canvas, im->xorigin,im->yorigin-im->ysize,
1845 im->xorigin+im->xsize,im->yorigin-im->ysize,
1846 GRIDWIDTH, im->graph_col[GRC_AXIS]); */
1848 gfx_new_line ( im->canvas, im->xorigin-4,im->yorigin,
1849 im->xorigin+im->xsize+4,im->yorigin,
1850 MGRIDWIDTH, im->graph_col[GRC_AXIS]);
1852 gfx_new_line ( im->canvas, im->xorigin,im->yorigin+4,
1853 im->xorigin,im->yorigin-im->ysize-4,
1854 MGRIDWIDTH, im->graph_col[GRC_AXIS]);
1857 /* arrow for X axis direction */
1858 gfx_new_area ( im->canvas,
1859 im->xorigin+im->xsize+3, im->yorigin-3,
1860 im->xorigin+im->xsize+3, im->yorigin+4,
1861 im->xorigin+im->xsize+8, im->yorigin+0.5, /* LINEOFFSET */
1862 im->graph_col[GRC_ARROW]);
1867 grid_paint(image_desc_t *im)
1871 double X0,Y0; /* points for filled graph and more*/
1874 /* draw 3d border */
1875 node = gfx_new_area (im->canvas, 0,im->yimg,
1877 2,2,im->graph_col[GRC_SHADEA]);
1878 gfx_add_point( node , im->ximg - 2, 2 );
1879 gfx_add_point( node , im->ximg, 0 );
1880 gfx_add_point( node , 0,0 );
1881 /* gfx_add_point( node , 0,im->yimg ); */
1883 node = gfx_new_area (im->canvas, 2,im->yimg-2,
1884 im->ximg-2,im->yimg-2,
1886 im->graph_col[GRC_SHADEB]);
1887 gfx_add_point( node , im->ximg,0);
1888 gfx_add_point( node , im->ximg,im->yimg);
1889 gfx_add_point( node , 0,im->yimg);
1890 /* gfx_add_point( node , 0,im->yimg ); */
1893 if (im->draw_x_grid == 1 )
1896 if (im->draw_y_grid == 1){
1897 if(im->logarithmic){
1898 res = horizontal_log_grid(im);
1900 res = draw_horizontal_grid(im);
1903 /* dont draw horizontal grid if there is no min and max val */
1905 char *nodata = "No Data found";
1906 gfx_new_text(im->canvas,im->ximg/2, (2*im->yorigin-im->ysize) / 2,
1907 im->graph_col[GRC_FONT],
1908 im->text_prop[TEXT_PROP_AXIS].font,
1909 im->text_prop[TEXT_PROP_AXIS].size,
1910 im->tabwidth, 0.0, GFX_H_CENTER, GFX_V_CENTER,
1915 /* yaxis unit description */
1916 gfx_new_text( im->canvas,
1917 7, (im->yorigin - im->ysize/2),
1918 im->graph_col[GRC_FONT],
1919 im->text_prop[TEXT_PROP_UNIT].font,
1920 im->text_prop[TEXT_PROP_UNIT].size, im->tabwidth,
1921 RRDGRAPH_YLEGEND_ANGLE,
1922 GFX_H_LEFT, GFX_V_CENTER,
1926 gfx_new_text( im->canvas,
1927 im->ximg/2, im->text_prop[TEXT_PROP_TITLE].size*1.2,
1928 im->graph_col[GRC_FONT],
1929 im->text_prop[TEXT_PROP_TITLE].font,
1930 im->text_prop[TEXT_PROP_TITLE].size, im->tabwidth, 0.0,
1931 GFX_H_CENTER, GFX_V_CENTER,
1935 if( !(im->extra_flags & NOLEGEND) & !(im->extra_flags & ONLY_GRAPH) ) {
1936 for(i=0;i<im->gdes_c;i++){
1937 if(im->gdes[i].legend[0] =='\0')
1940 /* im->gdes[i].leg_y is the bottom of the legend */
1941 X0 = im->gdes[i].leg_x;
1942 Y0 = im->gdes[i].leg_y;
1943 gfx_new_text ( im->canvas, X0, Y0,
1944 im->graph_col[GRC_FONT],
1945 im->text_prop[TEXT_PROP_LEGEND].font,
1946 im->text_prop[TEXT_PROP_LEGEND].size,
1947 im->tabwidth,0.0, GFX_H_LEFT, GFX_V_BOTTOM,
1948 im->gdes[i].legend );
1949 /* The legend for GRAPH items starts with "M " to have
1950 enough space for the box */
1951 if ( im->gdes[i].gf != GF_PRINT &&
1952 im->gdes[i].gf != GF_GPRINT &&
1953 im->gdes[i].gf != GF_COMMENT) {
1956 boxH = gfx_get_text_width(im->canvas, 0,
1957 im->text_prop[TEXT_PROP_LEGEND].font,
1958 im->text_prop[TEXT_PROP_LEGEND].size,
1959 im->tabwidth,"M", 0)*1.2;
1962 /* make sure transparent colors show up all the same */
1963 node = gfx_new_area(im->canvas,
1967 im->graph_col[GRC_CANVAS]);
1968 gfx_add_point ( node, X0+boxH, Y0-boxV );
1970 node = gfx_new_area(im->canvas,
1975 gfx_add_point ( node, X0+boxH, Y0-boxV );
1976 node = gfx_new_line(im->canvas,
1978 1,im->graph_col[GRC_FONT]);
1979 gfx_add_point(node,X0+boxH,Y0);
1980 gfx_add_point(node,X0+boxH,Y0-boxV);
1981 gfx_close_path(node);
1988 /*****************************************************
1989 * lazy check make sure we rely need to create this graph
1990 *****************************************************/
1992 int lazy_check(image_desc_t *im){
1995 struct stat imgstat;
1997 if (im->lazy == 0) return 0; /* no lazy option */
1998 if (stat(im->graphfile,&imgstat) != 0)
1999 return 0; /* can't stat */
2000 /* one pixel in the existing graph is more then what we would
2002 if (time(NULL) - imgstat.st_mtime >
2003 (im->end - im->start) / im->xsize)
2005 if ((fd = fopen(im->graphfile,"rb")) == NULL)
2006 return 0; /* the file does not exist */
2007 switch (im->canvas->imgformat) {
2009 size = PngSize(fd,&(im->ximg),&(im->yimg));
2018 #ifdef WITH_PIECHART
2020 pie_part(image_desc_t *im, gfx_color_t color,
2021 double PieCenterX, double PieCenterY, double Radius,
2022 double startangle, double endangle)
2026 double step=M_PI/50; /* Number of iterations for the circle;
2027 ** 10 is definitely too low, more than
2028 ** 50 seems to be overkill
2031 /* Strange but true: we have to work clockwise or else
2032 ** anti aliasing nor transparency don't work.
2034 ** This test is here to make sure we do it right, also
2035 ** this makes the for...next loop more easy to implement.
2036 ** The return will occur if the user enters a negative number
2037 ** (which shouldn't be done according to the specs) or if the
2038 ** programmers do something wrong (which, as we all know, never
2039 ** happens anyway :)
2041 if (endangle<startangle) return;
2043 /* Hidden feature: Radius decreases each full circle */
2045 while (angle>=2*M_PI) {
2050 node=gfx_new_area(im->canvas,
2051 PieCenterX+sin(startangle)*Radius,
2052 PieCenterY-cos(startangle)*Radius,
2055 PieCenterX+sin(endangle)*Radius,
2056 PieCenterY-cos(endangle)*Radius,
2058 for (angle=endangle;angle-startangle>=step;angle-=step) {
2060 PieCenterX+sin(angle)*Radius,
2061 PieCenterY-cos(angle)*Radius );
2068 graph_size_location(image_desc_t *im, int elements
2070 #ifdef WITH_PIECHART
2076 /* The actual size of the image to draw is determined from
2077 ** several sources. The size given on the command line is
2078 ** the graph area but we need more as we have to draw labels
2079 ** and other things outside the graph area
2082 /* +-+-------------------------------------------+
2083 ** |l|.................title.....................|
2084 ** |e+--+-------------------------------+--------+
2087 ** |l| l| main graph area | chart |
2090 ** |r+--+-------------------------------+--------+
2091 ** |e| | x-axis labels | |
2092 ** |v+--+-------------------------------+--------+
2093 ** | |..............legends......................|
2094 ** +-+-------------------------------------------+
2096 int Xvertical=0, Yvertical=0,
2097 Xtitle =0, Ytitle =0,
2098 Xylabel =0, Yylabel =0,
2100 #ifdef WITH_PIECHART
2103 Xxlabel =0, Yxlabel =0,
2105 Xlegend =0, Ylegend =0,
2107 Xspacing =10, Yspacing =10;
2109 if (im->extra_flags & ONLY_GRAPH) {
2111 im->ximg = im->xsize;
2112 im->yimg = im->ysize;
2113 im->yorigin = im->ysize;
2117 if (im->ylegend[0] != '\0' ) {
2118 Xvertical = im->text_prop[TEXT_PROP_UNIT].size *2;
2119 Yvertical = gfx_get_text_width(im->canvas, 0,
2120 im->text_prop[TEXT_PROP_UNIT].font,
2121 im->text_prop[TEXT_PROP_UNIT].size,
2122 im->tabwidth,im->ylegend, 0);
2126 if (im->title[0] != '\0') {
2127 /* The title is placed "inbetween" two text lines so it
2128 ** automatically has some vertical spacing. The horizontal
2129 ** spacing is added here, on each side.
2131 Xtitle = gfx_get_text_width(im->canvas, 0,
2132 im->text_prop[TEXT_PROP_TITLE].font,
2133 im->text_prop[TEXT_PROP_TITLE].size,
2135 im->title, 0) + 2*Xspacing;
2136 Ytitle = im->text_prop[TEXT_PROP_TITLE].size*2.5;
2142 if (im->draw_x_grid) {
2144 Yxlabel=im->text_prop[TEXT_PROP_AXIS].size *2.5;
2146 if (im->draw_y_grid) {
2147 Xylabel=im->text_prop[TEXT_PROP_AXIS].size *6;
2152 #ifdef WITH_PIECHART
2154 im->piesize=im->xsize<im->ysize?im->xsize:im->ysize;
2160 /* Now calculate the total size. Insert some spacing where
2161 desired. im->xorigin and im->yorigin need to correspond
2162 with the lower left corner of the main graph area or, if
2163 this one is not set, the imaginary box surrounding the
2166 /* The legend width cannot yet be determined, as a result we
2167 ** have problems adjusting the image to it. For now, we just
2168 ** forget about it at all; the legend will have to fit in the
2169 ** size already allocated.
2171 im->ximg = Xylabel + Xmain + 2 * Xspacing;
2173 #ifdef WITH_PIECHART
2177 if (Xmain) im->ximg += Xspacing;
2178 #ifdef WITH_PIECHART
2179 if (Xpie) im->ximg += Xspacing;
2182 im->xorigin = Xspacing + Xylabel;
2184 if (Xtitle > im->ximg) im->ximg = Xtitle;
2186 if (Xvertical) { /* unit description */
2187 im->ximg += Xvertical;
2188 im->xorigin += Xvertical;
2192 /* The vertical size is interesting... we need to compare
2193 ** the sum of {Ytitle, Ymain, Yxlabel, Ylegend} with Yvertical
2194 ** however we need to know {Ytitle+Ymain+Yxlabel} in order to
2195 ** start even thinking about Ylegend.
2197 ** Do it in three portions: First calculate the inner part,
2198 ** then do the legend, then adjust the total height of the img.
2201 /* reserve space for main and/or pie */
2203 im->yimg = Ymain + Yxlabel;
2205 #ifdef WITH_PIECHART
2206 if (im->yimg < Ypie) im->yimg = Ypie;
2209 im->yorigin = im->yimg - Yxlabel;
2211 /* reserve space for the title *or* some padding above the graph */
2214 im->yorigin += Ytitle;
2216 im->yimg += Yspacing;
2217 im->yorigin += Yspacing;
2219 /* reserve space for padding below the graph */
2220 im->yimg += Yspacing;
2223 /* Determine where to place the legends onto the image.
2224 ** Adjust im->yimg to match the space requirements.
2226 if(leg_place(im)==-1)
2229 /* last of three steps: check total height of image */
2230 if (im->yimg < Yvertical) im->yimg = Yvertical;
2233 if (Xlegend > im->ximg) {
2235 /* reposition Pie */
2239 #ifdef WITH_PIECHART
2240 /* The pie is placed in the upper right hand corner,
2241 ** just below the title (if any) and with sufficient
2245 im->pie_x = im->ximg - Xspacing - Xpie/2;
2246 im->pie_y = im->yorigin-Ymain+Ypie/2;
2248 im->pie_x = im->ximg/2;
2249 im->pie_y = im->yorigin-Ypie/2;
2256 /* draw that picture thing ... */
2258 graph_paint(image_desc_t *im, char ***calcpr)
2261 int lazy = lazy_check(im);
2262 #ifdef WITH_PIECHART
2264 double PieStart=0.0;
2269 double areazero = 0.0;
2270 enum gf_en stack_gf = GF_PRINT;
2271 graph_desc_t *lastgdes = NULL;
2273 /* if we are lazy and there is nothing to PRINT ... quit now */
2274 if (lazy && im->prt_c==0) return 0;
2276 /* pull the data from the rrd files ... */
2278 if(data_fetch(im)==-1)
2281 /* evaluate VDEF and CDEF operations ... */
2282 if(data_calc(im)==-1)
2285 #ifdef WITH_PIECHART
2286 /* check if we need to draw a piechart */
2287 for(i=0;i<im->gdes_c;i++){
2288 if (im->gdes[i].gf == GF_PART) {
2295 /* calculate and PRINT and GPRINT definitions. We have to do it at
2296 * this point because it will affect the length of the legends
2297 * if there are no graph elements we stop here ...
2298 * if we are lazy, try to quit ...
2300 i=print_calc(im,calcpr);
2303 #ifdef WITH_PIECHART
2306 ) || lazy) return 0;
2308 #ifdef WITH_PIECHART
2309 /* If there's only the pie chart to draw, signal this */
2310 if (i==0) piechart=2;
2313 /* get actual drawing data and find min and max values*/
2314 if(data_proc(im)==-1)
2317 if(!im->logarithmic){si_unit(im);} /* identify si magnitude Kilo, Mega Giga ? */
2319 if(!im->rigid && ! im->logarithmic)
2320 expand_range(im); /* make sure the upper and lower limit are
2323 if (!calc_horizontal_grid(im))
2330 /**************************************************************
2331 *** Calculating sizes and locations became a bit confusing ***
2332 *** so I moved this into a separate function. ***
2333 **************************************************************/
2334 if(graph_size_location(im,i
2335 #ifdef WITH_PIECHART
2341 /* the actual graph is created by going through the individual
2342 graph elements and then drawing them */
2344 node=gfx_new_area ( im->canvas,
2348 im->graph_col[GRC_BACK]);
2350 gfx_add_point(node,0, im->yimg);
2352 #ifdef WITH_PIECHART
2353 if (piechart != 2) {
2355 node=gfx_new_area ( im->canvas,
2356 im->xorigin, im->yorigin,
2357 im->xorigin + im->xsize, im->yorigin,
2358 im->xorigin + im->xsize, im->yorigin-im->ysize,
2359 im->graph_col[GRC_CANVAS]);
2361 gfx_add_point(node,im->xorigin, im->yorigin - im->ysize);
2363 if (im->minval > 0.0)
2364 areazero = im->minval;
2365 if (im->maxval < 0.0)
2366 areazero = im->maxval;
2367 #ifdef WITH_PIECHART
2371 #ifdef WITH_PIECHART
2373 pie_part(im,im->graph_col[GRC_CANVAS],im->pie_x,im->pie_y,im->piesize*0.5,0,2*M_PI);
2377 for(i=0;i<im->gdes_c;i++){
2378 switch(im->gdes[i].gf){
2391 for (ii = 0; ii < im->xsize; ii++)
2393 if (!isnan(im->gdes[i].p_data[ii]) &&
2394 im->gdes[i].p_data[ii] > 0.0)
2396 /* generate a tick */
2397 gfx_new_line(im->canvas, im -> xorigin + ii,
2398 im -> yorigin - (im -> gdes[i].yrule * im -> ysize),
2402 im -> gdes[i].col );
2408 stack_gf = im->gdes[i].gf;
2410 /* fix data points at oo and -oo */
2411 for(ii=0;ii<im->xsize;ii++){
2412 if (isinf(im->gdes[i].p_data[ii])){
2413 if (im->gdes[i].p_data[ii] > 0) {
2414 im->gdes[i].p_data[ii] = im->maxval ;
2416 im->gdes[i].p_data[ii] = im->minval ;
2422 if (im->gdes[i].col != 0x0){
2423 /* GF_LINE and friend */
2424 if(stack_gf == GF_LINE ){
2426 for(ii=1;ii<im->xsize;ii++){
2427 if ( ! isnan(im->gdes[i].p_data[ii-1])
2428 && ! isnan(im->gdes[i].p_data[ii])){
2430 node = gfx_new_line(im->canvas,
2431 ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii-1]),
2432 ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2433 im->gdes[i].linewidth,
2436 gfx_add_point(node,ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]));
2445 for(ii=1;ii<im->xsize;ii++){
2447 if ( ! isnan(im->gdes[i].p_data[ii-1])
2448 && ! isnan(im->gdes[i].p_data[ii])){
2452 if (im->gdes[i].gf == GF_STACK) {
2454 if ( (im->gdes[i].gf == GF_STACK)
2455 || (im->gdes[i].stack) ) {
2457 ybase = ytr(im,lastgdes->p_data[ii-1]);
2459 ybase = ytr(im,areazero);
2462 node = gfx_new_area(im->canvas,
2463 ii-1+im->xorigin,ybase,
2464 ii-1+im->xorigin,ytr(im,im->gdes[i].p_data[ii-1]),
2465 ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]),
2469 gfx_add_point(node,ii+im->xorigin,ytr(im,im->gdes[i].p_data[ii]));
2473 if ( node != NULL && (ii+1==im->xsize || isnan(im->gdes[i].p_data[ii]) )){
2474 /* GF_AREA STACK type*/
2476 if (im->gdes[i].gf == GF_STACK ) {
2478 if ( (im->gdes[i].gf == GF_STACK)
2479 || (im->gdes[i].stack) ) {
2481 for (iii=ii-1;iii>area_start;iii--){
2482 gfx_add_point(node,iii+im->xorigin,ytr(im,lastgdes->p_data[iii]));
2485 gfx_add_point(node,ii+im->xorigin,ytr(im,areazero));
2490 } /* else GF_LINE */
2491 } /* if color != 0x0 */
2492 /* make sure we do not run into trouble when stacking on NaN */
2493 for(ii=0;ii<im->xsize;ii++){
2494 if (isnan(im->gdes[i].p_data[ii])) {
2495 if (lastgdes && (im->gdes[i].gf == GF_STACK)) {
2496 im->gdes[i].p_data[ii] = lastgdes->p_data[ii];
2498 im->gdes[i].p_data[ii] = ytr(im,areazero);
2502 lastgdes = &(im->gdes[i]);
2504 #ifdef WITH_PIECHART
2506 if(isnan(im->gdes[i].yrule)) /* fetch variable */
2507 im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
2509 if (finite(im->gdes[i].yrule)) { /* even the fetched var can be NaN */
2510 pie_part(im,im->gdes[i].col,
2511 im->pie_x,im->pie_y,im->piesize*0.4,
2512 M_PI*2.0*PieStart/100.0,
2513 M_PI*2.0*(PieStart+im->gdes[i].yrule)/100.0);
2514 PieStart += im->gdes[i].yrule;
2521 #ifdef WITH_PIECHART
2528 if( !(im->extra_flags & ONLY_GRAPH) )
2531 /* grid_paint also does the text */
2532 if( !(im->extra_flags & ONLY_GRAPH) )
2535 /* the RULES are the last thing to paint ... */
2536 for(i=0;i<im->gdes_c;i++){
2538 switch(im->gdes[i].gf){
2540 if(isnan(im->gdes[i].yrule)) { /* fetch variable */
2541 im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
2543 if(im->gdes[i].yrule >= im->minval
2544 && im->gdes[i].yrule <= im->maxval)
2545 gfx_new_line(im->canvas,
2546 im->xorigin,ytr(im,im->gdes[i].yrule),
2547 im->xorigin+im->xsize,ytr(im,im->gdes[i].yrule),
2548 1.0,im->gdes[i].col);
2551 if(im->gdes[i].xrule == 0) { /* fetch variable */
2552 im->gdes[i].xrule = im->gdes[im->gdes[i].vidx].vf.when;
2554 if(im->gdes[i].xrule >= im->start
2555 && im->gdes[i].xrule <= im->end)
2556 gfx_new_line(im->canvas,
2557 xtr(im,im->gdes[i].xrule),im->yorigin,
2558 xtr(im,im->gdes[i].xrule),im->yorigin-im->ysize,
2559 1.0,im->gdes[i].col);
2567 if (strcmp(im->graphfile,"-")==0) {
2568 fo = im->graphhandle ? im->graphhandle : stdout;
2569 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
2570 /* Change translation mode for stdout to BINARY */
2571 _setmode( _fileno( fo ), O_BINARY );
2574 if ((fo = fopen(im->graphfile,"wb")) == NULL) {
2575 rrd_set_error("Opening '%s' for write: %s",im->graphfile,
2576 rrd_strerror(errno));
2580 gfx_render (im->canvas,im->ximg,im->yimg,0x0,fo);
2581 if (strcmp(im->graphfile,"-") != 0)
2587 /*****************************************************
2589 *****************************************************/
2592 gdes_alloc(image_desc_t *im){
2595 if ((im->gdes = (graph_desc_t *) rrd_realloc(im->gdes, (im->gdes_c)
2596 * sizeof(graph_desc_t)))==NULL){
2597 rrd_set_error("realloc graph_descs");
2602 im->gdes[im->gdes_c-1].step=im->step;
2603 im->gdes[im->gdes_c-1].stack=0;
2604 im->gdes[im->gdes_c-1].debug=0;
2605 im->gdes[im->gdes_c-1].start=im->start;
2606 im->gdes[im->gdes_c-1].end=im->end;
2607 im->gdes[im->gdes_c-1].vname[0]='\0';
2608 im->gdes[im->gdes_c-1].data=NULL;
2609 im->gdes[im->gdes_c-1].ds_namv=NULL;
2610 im->gdes[im->gdes_c-1].data_first=0;
2611 im->gdes[im->gdes_c-1].p_data=NULL;
2612 im->gdes[im->gdes_c-1].rpnp=NULL;
2613 im->gdes[im->gdes_c-1].shift=0;
2614 im->gdes[im->gdes_c-1].col = 0x0;
2615 im->gdes[im->gdes_c-1].legend[0]='\0';
2616 im->gdes[im->gdes_c-1].format[0]='\0';
2617 im->gdes[im->gdes_c-1].rrd[0]='\0';
2618 im->gdes[im->gdes_c-1].ds=-1;
2619 im->gdes[im->gdes_c-1].p_data=NULL;
2620 im->gdes[im->gdes_c-1].yrule=DNAN;
2621 im->gdes[im->gdes_c-1].xrule=0;
2625 /* copies input untill the first unescaped colon is found
2626 or until input ends. backslashes have to be escaped as well */
2628 scan_for_col(char *input, int len, char *output)
2633 input[inp] != ':' &&
2636 if (input[inp] == '\\' &&
2637 input[inp+1] != '\0' &&
2638 (input[inp+1] == '\\' ||
2639 input[inp+1] == ':')){
2640 output[outp++] = input[++inp];
2643 output[outp++] = input[inp];
2646 output[outp] = '\0';
2649 /* Some surgery done on this function, it became ridiculously big.
2651 ** - initializing now in rrd_graph_init()
2652 ** - options parsing now in rrd_graph_options()
2653 ** - script parsing now in rrd_graph_script()
2656 rrd_graph(int argc, char **argv, char ***prdata, int *xsize, int *ysize, FILE *stream, double *ymin, double *ymax)
2660 rrd_graph_init(&im);
2661 im.graphhandle = stream;
2663 rrd_graph_options(argc,argv,&im);
2664 if (rrd_test_error()) {
2669 if (strlen(argv[optind])>=MAXPATH) {
2670 rrd_set_error("filename (including path) too long");
2674 strncpy(im.graphfile,argv[optind],MAXPATH-1);
2675 im.graphfile[MAXPATH-1]='\0';
2677 rrd_graph_script(argc,argv,&im,1);
2678 if (rrd_test_error()) {
2683 /* Everything is now read and the actual work can start */
2686 if (graph_paint(&im,prdata)==-1){
2691 /* The image is generated and needs to be output.
2692 ** Also, if needed, print a line with information about the image.
2702 /* maybe prdata is not allocated yet ... lets do it now */
2703 if ((*prdata = calloc(2,sizeof(char *)))==NULL) {
2704 rrd_set_error("malloc imginfo");
2708 if(((*prdata)[0] = malloc((strlen(im.imginfo)+200+strlen(im.graphfile))*sizeof(char)))
2710 rrd_set_error("malloc imginfo");
2713 filename=im.graphfile+strlen(im.graphfile);
2714 while(filename > im.graphfile) {
2715 if (*(filename-1)=='/' || *(filename-1)=='\\' ) break;
2719 sprintf((*prdata)[0],im.imginfo,filename,(long)(im.canvas->zoom*im.ximg),(long)(im.canvas->zoom*im.yimg));
2726 rrd_graph_init(image_desc_t *im)
2733 #ifdef HAVE_SETLOCALE
2734 setlocale(LC_TIME,"");
2737 im->xlab_user.minsec = -1;
2743 im->ylegend[0] = '\0';
2744 im->title[0] = '\0';
2747 im->unitsexponent= 9999;
2753 im->logarithmic = 0;
2754 im->ygridstep = DNAN;
2755 im->draw_x_grid = 1;
2756 im->draw_y_grid = 1;
2761 im->canvas = gfx_new_canvas();
2762 im->grid_dash_on = 1;
2763 im->grid_dash_off = 1;
2764 im->tabwidth = 40.0;
2766 for(i=0;i<DIM(graph_col);i++)
2767 im->graph_col[i]=graph_col[i];
2769 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
2772 char rrd_win_default_font[1000];
2773 windir = getenv("windir");
2774 /* %windir% is something like D:\windows or C:\winnt */
2775 if (windir != NULL) {
2776 strncpy(rrd_win_default_font,windir,999);
2777 rrd_win_default_font[999] = '\0';
2778 strcat(rrd_win_default_font,"\\fonts\\cour.ttf");
2779 for(i=0;i<DIM(text_prop);i++){
2780 strncpy(text_prop[i].font,rrd_win_default_font,sizeof(text_prop[i].font)-1);
2781 text_prop[i].font[sizeof(text_prop[i].font)-1] = '\0';
2787 deffont = getenv("RRD_DEFAULT_FONT");
2788 /* %windir% is something like D:\windows or C:\winnt */
2789 if (deffont != NULL) {
2790 for(i=0;i<DIM(text_prop);i++){
2791 strncpy(text_prop[i].font,deffont,sizeof(text_prop[i].font)-1);
2792 text_prop[i].font[sizeof(text_prop[i].font)-1] = '\0';
2796 for(i=0;i<DIM(text_prop);i++){
2797 im->text_prop[i].size = text_prop[i].size;
2798 strcpy(im->text_prop[i].font,text_prop[i].font);
2803 rrd_graph_options(int argc, char *argv[],image_desc_t *im)
2806 char *parsetime_error = NULL;
2807 char scan_gtm[12],scan_mtm[12],scan_ltm[12],col_nam[12];
2808 time_t start_tmp=0,end_tmp=0;
2810 struct rrd_time_value start_tv, end_tv;
2813 parsetime("end-24h", &start_tv);
2814 parsetime("now", &end_tv);
2817 static struct option long_options[] =
2819 {"start", required_argument, 0, 's'},
2820 {"end", required_argument, 0, 'e'},
2821 {"x-grid", required_argument, 0, 'x'},
2822 {"y-grid", required_argument, 0, 'y'},
2823 {"vertical-label",required_argument,0,'v'},
2824 {"width", required_argument, 0, 'w'},
2825 {"height", required_argument, 0, 'h'},
2826 {"interlaced", no_argument, 0, 'i'},
2827 {"upper-limit",required_argument, 0, 'u'},
2828 {"lower-limit",required_argument, 0, 'l'},
2829 {"rigid", no_argument, 0, 'r'},
2830 {"base", required_argument, 0, 'b'},
2831 {"logarithmic",no_argument, 0, 'o'},
2832 {"color", required_argument, 0, 'c'},
2833 {"font", required_argument, 0, 'n'},
2834 {"title", required_argument, 0, 't'},
2835 {"imginfo", required_argument, 0, 'f'},
2836 {"imgformat", required_argument, 0, 'a'},
2837 {"lazy", no_argument, 0, 'z'},
2838 {"zoom", required_argument, 0, 'm'},
2839 {"no-legend", no_argument, 0, 'g'},
2840 {"force-rules-legend",no_argument,0, 'F'},
2841 {"only-graph", no_argument, 0, 'j'},
2842 {"alt-y-grid", no_argument, 0, 'Y'},
2843 {"no-minor", no_argument, 0, 'I'},
2844 {"alt-autoscale", no_argument, 0, 'A'},
2845 {"alt-autoscale-max", no_argument, 0, 'M'},
2846 {"units-exponent",required_argument, 0, 'X'},
2847 {"step", required_argument, 0, 'S'},
2848 {"tabwidth", required_argument, 0, 'T'},
2849 {"no-gridfit", no_argument, 0, 'N'},
2851 int option_index = 0;
2855 opt = getopt_long(argc, argv,
2856 "s:e:x:y:v:w:h:iu:l:rb:oc:n:m:t:f:a:I:zgjFYAMX:S:NT:",
2857 long_options, &option_index);
2864 im->extra_flags |= NOMINOR;
2867 im->extra_flags |= ALTYGRID;
2870 im->extra_flags |= ALTAUTOSCALE;
2873 im->extra_flags |= ALTAUTOSCALE_MAX;
2876 im->extra_flags |= ONLY_GRAPH;
2879 im->extra_flags |= NOLEGEND;
2882 im->extra_flags |= FORCE_RULES_LEGEND;
2885 im->unitsexponent = atoi(optarg);
2888 im->tabwidth = atof(optarg);
2891 im->step = atoi(optarg);
2897 if ((parsetime_error = parsetime(optarg, &start_tv))) {
2898 rrd_set_error( "start time: %s", parsetime_error );
2903 if ((parsetime_error = parsetime(optarg, &end_tv))) {
2904 rrd_set_error( "end time: %s", parsetime_error );
2909 if(strcmp(optarg,"none") == 0){
2915 "%10[A-Z]:%ld:%10[A-Z]:%ld:%10[A-Z]:%ld:%ld:%n",
2917 &im->xlab_user.gridst,
2919 &im->xlab_user.mgridst,
2921 &im->xlab_user.labst,
2922 &im->xlab_user.precis,
2923 &stroff) == 7 && stroff != 0){
2924 strncpy(im->xlab_form, optarg+stroff, sizeof(im->xlab_form) - 1);
2925 im->xlab_form[sizeof(im->xlab_form)-1] = '\0';
2926 if((int)(im->xlab_user.gridtm = tmt_conv(scan_gtm)) == -1){
2927 rrd_set_error("unknown keyword %s",scan_gtm);
2929 } else if ((int)(im->xlab_user.mgridtm = tmt_conv(scan_mtm)) == -1){
2930 rrd_set_error("unknown keyword %s",scan_mtm);
2932 } else if ((int)(im->xlab_user.labtm = tmt_conv(scan_ltm)) == -1){
2933 rrd_set_error("unknown keyword %s",scan_ltm);
2936 im->xlab_user.minsec = 1;
2937 im->xlab_user.stst = im->xlab_form;
2939 rrd_set_error("invalid x-grid format");
2945 if(strcmp(optarg,"none") == 0){
2953 &im->ylabfact) == 2) {
2954 if(im->ygridstep<=0){
2955 rrd_set_error("grid step must be > 0");
2957 } else if (im->ylabfact < 1){
2958 rrd_set_error("label factor must be > 0");
2962 rrd_set_error("invalid y-grid format");
2967 strncpy(im->ylegend,optarg,150);
2968 im->ylegend[150]='\0';
2971 im->maxval = atof(optarg);
2974 im->minval = atof(optarg);
2977 im->base = atol(optarg);
2978 if(im->base != 1024 && im->base != 1000 ){
2979 rrd_set_error("the only sensible value for base apart from 1000 is 1024");
2984 long_tmp = atol(optarg);
2985 if (long_tmp < 10) {
2986 rrd_set_error("width below 10 pixels");
2989 im->xsize = long_tmp;
2992 long_tmp = atol(optarg);
2993 if (long_tmp < 10) {
2994 rrd_set_error("height below 10 pixels");
2997 im->ysize = long_tmp;
3000 im->canvas->interlaced = 1;
3006 im->imginfo = optarg;
3009 if((int)(im->canvas->imgformat = if_conv(optarg)) == -1) {
3010 rrd_set_error("unsupported graphics format '%s'",optarg);
3018 im->logarithmic = 1;
3019 if (isnan(im->minval))
3025 col_nam,&color) == 2){
3027 if((ci=grc_conv(col_nam)) != -1){
3028 im->graph_col[ci]=color;
3030 rrd_set_error("invalid color name '%s'",col_nam);
3033 rrd_set_error("invalid color def format");
3043 "%10[A-Z]:%lf:%1000s",
3044 prop,&size,font) == 3){
3046 if((sindex=text_prop_conv(prop)) != -1){
3047 im->text_prop[sindex].size=size;
3048 strcpy(im->text_prop[sindex].font,font);
3049 if (sindex==0) { /* the default */
3050 im->text_prop[TEXT_PROP_TITLE].size=size;
3051 strcpy(im->text_prop[TEXT_PROP_TITLE].font,font);
3052 im->text_prop[TEXT_PROP_AXIS].size=size;
3053 strcpy(im->text_prop[TEXT_PROP_AXIS].font,font);
3054 im->text_prop[TEXT_PROP_UNIT].size=size;
3055 strcpy(im->text_prop[TEXT_PROP_UNIT].font,font);
3056 im->text_prop[TEXT_PROP_LEGEND].size=size;
3057 strcpy(im->text_prop[TEXT_PROP_LEGEND].font,font);
3060 rrd_set_error("invalid fonttag '%s'",prop);
3064 rrd_set_error("invalid text property format");
3070 im->canvas->zoom = atof(optarg);
3071 if (im->canvas->zoom <= 0.0) {
3072 rrd_set_error("zoom factor must be > 0");
3077 strncpy(im->title,optarg,150);
3078 im->title[150]='\0';
3083 rrd_set_error("unknown option '%c'", optopt);
3085 rrd_set_error("unknown option '%s'",argv[optind-1]);
3090 if (optind >= argc) {
3091 rrd_set_error("missing filename");
3095 if (im->logarithmic == 1 && (im->minval <= 0 || isnan(im->minval))){
3096 rrd_set_error("for a logarithmic yaxis you must specify a lower-limit > 0");
3100 if (proc_start_end(&start_tv,&end_tv,&start_tmp,&end_tmp) == -1){
3101 /* error string is set in parsetime.c */
3105 if (start_tmp < 3600*24*365*10){
3106 rrd_set_error("the first entry to fetch should be after 1980 (%ld)",start_tmp);
3110 if (end_tmp < start_tmp) {
3111 rrd_set_error("start (%ld) should be less than end (%ld)",
3112 start_tmp, end_tmp);
3116 im->start = start_tmp;
3118 im->step = max((long)im->step, (im->end-im->start)/im->xsize);
3122 rrd_graph_check_vname(image_desc_t *im, char *varname, char *err)
3124 if ((im->gdes[im->gdes_c-1].vidx=find_var(im,varname))==-1) {
3125 rrd_set_error("Unknown variable '%s' in %s",varname,err);
3131 rrd_graph_color(image_desc_t *im, char *var, char *err, int optional)
3134 graph_desc_t *gdp=&im->gdes[im->gdes_c-1];
3136 color=strstr(var,"#");
3139 rrd_set_error("Found no color in %s",err);
3148 rest=strstr(color,":");
3156 sscanf(color,"#%6lx%n",&col,&n);
3157 col = (col << 8) + 0xff /* shift left by 8 */;
3158 if (n!=7) rrd_set_error("Color problem in %s",err);
3161 sscanf(color,"#%8lx%n",&col,&n);
3164 rrd_set_error("Color problem in %s",err);
3166 if (rrd_test_error()) return 0;
3173 int bad_format(char *fmt) {
3177 while (*ptr != '\0')
3178 if (*ptr++ == '%') {
3180 /* line cannot end with percent char */
3181 if (*ptr == '\0') return 1;
3183 /* '%s', '%S' and '%%' are allowed */
3184 if (*ptr == 's' || *ptr == 'S' || *ptr == '%') ptr++;
3186 /* or else '% 6.2lf' and such are allowed */
3189 /* optional padding character */
3190 if (*ptr == ' ' || *ptr == '+' || *ptr == '-') ptr++;
3192 /* This should take care of 'm.n' with all three optional */
3193 while (*ptr >= '0' && *ptr <= '9') ptr++;
3194 if (*ptr == '.') ptr++;
3195 while (*ptr >= '0' && *ptr <= '9') ptr++;
3197 /* Either 'le', 'lf' or 'lg' must follow here */
3198 if (*ptr++ != 'l') return 1;
3199 if (*ptr == 'e' || *ptr == 'f' || *ptr == 'g') ptr++;
3210 vdef_parse(gdes,str)
3211 struct graph_desc_t *gdes;
3214 /* A VDEF currently is either "func" or "param,func"
3215 * so the parsing is rather simple. Change if needed.
3222 sscanf(str,"%le,%29[A-Z]%n",¶m,func,&n);
3223 if (n== (int)strlen(str)) { /* matched */
3227 sscanf(str,"%29[A-Z]%n",func,&n);
3228 if (n== (int)strlen(str)) { /* matched */
3231 rrd_set_error("Unknown function string '%s' in VDEF '%s'"
3238 if (!strcmp("PERCENT",func)) gdes->vf.op = VDEF_PERCENT;
3239 else if (!strcmp("MAXIMUM",func)) gdes->vf.op = VDEF_MAXIMUM;
3240 else if (!strcmp("AVERAGE",func)) gdes->vf.op = VDEF_AVERAGE;
3241 else if (!strcmp("MINIMUM",func)) gdes->vf.op = VDEF_MINIMUM;
3242 else if (!strcmp("TOTAL", func)) gdes->vf.op = VDEF_TOTAL;
3243 else if (!strcmp("FIRST", func)) gdes->vf.op = VDEF_FIRST;
3244 else if (!strcmp("LAST", func)) gdes->vf.op = VDEF_LAST;
3246 rrd_set_error("Unknown function '%s' in VDEF '%s'\n"
3253 switch (gdes->vf.op) {
3255 if (isnan(param)) { /* no parameter given */
3256 rrd_set_error("Function '%s' needs parameter in VDEF '%s'\n"
3262 if (param>=0.0 && param<=100.0) {
3263 gdes->vf.param = param;
3264 gdes->vf.val = DNAN; /* undefined */
3265 gdes->vf.when = 0; /* undefined */
3267 rrd_set_error("Parameter '%f' out of range in VDEF '%s'\n"
3281 gdes->vf.param = DNAN;
3282 gdes->vf.val = DNAN;
3285 rrd_set_error("Function '%s' needs no parameter in VDEF '%s'\n"
3302 graph_desc_t *src,*dst;
3306 dst = &im->gdes[gdi];
3307 src = &im->gdes[dst->vidx];
3308 data = src->data + src->ds;
3309 steps = (src->end - src->start) / src->step;
3312 printf("DEBUG: start == %lu, end == %lu, %lu steps\n"
3319 switch (dst->vf.op) {
3320 case VDEF_PERCENT: {
3321 rrd_value_t * array;
3325 if ((array = malloc(steps*sizeof(double)))==NULL) {
3326 rrd_set_error("malloc VDEV_PERCENT");
3329 for (step=0;step < steps; step++) {
3330 array[step]=data[step*src->ds_cnt];
3332 qsort(array,step,sizeof(double),vdef_percent_compar);
3334 field = (steps-1)*dst->vf.param/100;
3335 dst->vf.val = array[field];
3336 dst->vf.when = 0; /* no time component */
3339 for(step=0;step<steps;step++)
3340 printf("DEBUG: %3li:%10.2f %c\n",step,array[step],step==field?'*':' ');
3346 while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3347 if (step == steps) {
3351 dst->vf.val = data[step*src->ds_cnt];
3352 dst->vf.when = src->start + (step+1)*src->step;
3354 while (step != steps) {
3355 if (finite(data[step*src->ds_cnt])) {
3356 if (data[step*src->ds_cnt] > dst->vf.val) {
3357 dst->vf.val = data[step*src->ds_cnt];
3358 dst->vf.when = src->start + (step+1)*src->step;
3365 case VDEF_AVERAGE: {
3368 for (step=0;step<steps;step++) {
3369 if (finite(data[step*src->ds_cnt])) {
3370 sum += data[step*src->ds_cnt];
3375 if (dst->vf.op == VDEF_TOTAL) {
3376 dst->vf.val = sum*src->step;
3377 dst->vf.when = cnt*src->step; /* not really "when" */
3379 dst->vf.val = sum/cnt;
3380 dst->vf.when = 0; /* no time component */
3390 while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3391 if (step == steps) {
3395 dst->vf.val = data[step*src->ds_cnt];
3396 dst->vf.when = src->start + (step+1)*src->step;
3398 while (step != steps) {
3399 if (finite(data[step*src->ds_cnt])) {
3400 if (data[step*src->ds_cnt] < dst->vf.val) {
3401 dst->vf.val = data[step*src->ds_cnt];
3402 dst->vf.when = src->start + (step+1)*src->step;
3409 /* The time value returned here is one step before the
3410 * actual time value. This is the start of the first
3414 while (step != steps && isnan(data[step*src->ds_cnt])) step++;
3415 if (step == steps) { /* all entries were NaN */
3419 dst->vf.val = data[step*src->ds_cnt];
3420 dst->vf.when = src->start + step*src->step;
3424 /* The time value returned here is the
3425 * actual time value. This is the end of the last
3429 while (step >= 0 && isnan(data[step*src->ds_cnt])) step--;
3430 if (step < 0) { /* all entries were NaN */
3434 dst->vf.val = data[step*src->ds_cnt];
3435 dst->vf.when = src->start + (step+1)*src->step;
3442 /* NaN < -INF < finite_values < INF */
3444 vdef_percent_compar(a,b)
3447 /* Equality is not returned; this doesn't hurt except
3448 * (maybe) for a little performance.
3451 /* First catch NaN values. They are smallest */
3452 if (isnan( *(double *)a )) return -1;
3453 if (isnan( *(double *)b )) return 1;
3455 /* NaN doesn't reach this part so INF and -INF are extremes.
3456 * The sign from isinf() is compatible with the sign we return
3458 if (isinf( *(double *)a )) return isinf( *(double *)a );
3459 if (isinf( *(double *)b )) return isinf( *(double *)b );
3461 /* If we reach this, both values must be finite */
3462 if ( *(double *)a < *(double *)b ) return -1; else return 1;