From: oetiker <oetiker@a5681a0c-68f1-0310-ab6d-d61299d08faa>
Date: Tue, 26 Mar 2002 07:02:28 +0000 (+0000)
Subject: added SVG support -- Peter Speck <speck@ruc.dk>
X-Git-Url: https://git.verplant.org/?a=commitdiff_plain;h=bd715d227c39077d697017e111919e9406833972;p=rrdtool.git

added SVG support -- Peter Speck <speck@ruc.dk>


git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk/program@106 a5681a0c-68f1-0310-ab6d-d61299d08faa
---

diff --git a/doc/rrdgraph.src b/doc/rrdgraph.src
index 06e0761..9dc4050 100644
--- a/doc/rrdgraph.src
+++ b/doc/rrdgraph.src
@@ -61,7 +61,7 @@ statements (after all, most of them do define graph elements...).
 =item filename
 
 The name and path of the graph to generate. It is recommended to
-end this in C<.png> or C<.gif> but B<rrdtool> does not enforce this.
+end this in C<.png> or C<.svg> but B<rrdtool> does not enforce this.
 
 I<filename> can be 'C<->' to send the image to C<stdout>. In
 that case, no other output is generated.  
@@ -300,9 +300,9 @@ for the graph legend.
 
 Use Times for the title: C<--font TITLE:13:/usr/lib/fonts/times.ttf>
 
-B<[-a|--imgformat C<PNG>]>
+B<[-a|--imgformat C<PNG>|C<SVG>]>
 
-At present only PNG is supported, but C<EPS>, C<SVG> or even C<FLASH> should
+At present only C<PNG> and C<SVG> are supported, but C<EPS>, or even C<FLASH> should
 not be all that difficult to add.
 
 B<[-i|--interlaced]>
diff --git a/src/rrd_gfx.c b/src/rrd_gfx.c
index 405291b..e36910d 100644
--- a/src/rrd_gfx.c
+++ b/src/rrd_gfx.c
@@ -37,6 +37,7 @@ gfx_node_t *gfx_new_node( gfx_canvas_t *canvas,enum gfx_en type){
   node->text = NULL;
   node->x = 0.0;
   node->y = 0.0;          /* position */
+  node->angle = 0;  
   node->halign = GFX_H_NULL; /* text alignement */
   node->valign = GFX_V_NULL; /* text alignement */
   node->tabwidth = 0.0; 
@@ -173,6 +174,7 @@ gfx_node_t   *gfx_new_text   (gfx_canvas_t *canvas,
    node->filename = strdup(font);
    node->x = x;
    node->y = y;
+   node->angle = angle;   
    node->color = color;
    node->tabwidth = tabwidth;
    node->halign = h_align;
@@ -467,3 +469,403 @@ static int gfx_save_png (art_u8 *buffer, FILE *fp,  long width, long height, lon
   png_destroy_write_struct(&png_ptr, &info_ptr);
   return 1;
 }
+
+ 
+static int svg_indent = 0;
+static int svg_single_line = 0;
+static void svg_print_indent(FILE *fp)
+{
+  int i;
+   for (i = svg_indent - svg_single_line; i > 0; i--) {
+     putc(' ', fp);
+     putc(' ', fp);
+   }
+}
+ 
+static void svg_start_tag(FILE *fp, const char *name)
+ {
+   svg_print_indent(fp);
+   putc('<', fp);
+   fputs(name, fp);
+   svg_indent++;
+ }
+ 
+ static void svg_close_tag_single_line(FILE *fp)
+ {
+   svg_single_line++;
+   putc('>', fp);
+ }
+ 
+ static void svg_close_tag(FILE *fp)
+ {
+   putc('>', fp);
+   if (!svg_single_line)
+     putc('\n', fp);
+ }
+ 
+ static void svg_end_tag(FILE *fp, const char *name)
+ {
+   /* name is NULL if closing empty-node tag */
+   svg_indent--;
+   if (svg_single_line)
+     svg_single_line--;
+   else if (name)
+     svg_print_indent(fp);
+   if (name != NULL) {
+     fputs("</", fp);
+     fputs(name, fp);
+   } else {
+     putc('/', fp);
+   }
+   svg_close_tag(fp);
+ }
+ 
+ static void svg_close_tag_empty_node(FILE *fp)
+ {
+   svg_end_tag(fp, NULL);
+ }
+ 
+ static void svg_write_text(FILE *fp, const char *p)
+ {
+   char ch;
+   const char *start, *last;
+   if (!p)
+     return;
+   /* trim leading spaces */
+   while (*p == ' ')
+     p++;
+   start = p;
+   /* trim trailing spaces */
+   last = p - 1;
+   while ((ch = *p) != 0) {
+     if (ch != ' ')
+       last = p;
+     p++;
+  }
+   /* encode trimmed text */
+   p = start;
+   while (p <= last) {
+     ch = *p++;
+     switch (ch) {
+       case '&': fputs("&amp;", fp); break;
+       case '<': fputs("&lt;", fp); break;
+       case '>': fputs("&gt;", fp); break;
+       case '"': fputs("&quot;", fp); break;
+       default: putc(ch, fp);
+     }
+   }
+ }
+ 
+ static void svg_write_number(FILE *fp, double d)
+ {
+   /* omit decimals if integer to reduce filesize */
+   char buf[60], *p;
+   snprintf(buf, sizeof(buf), "%.2f", d);
+   p = buf; /* doesn't trust snprintf return value */
+   while (*p)
+     p++;
+   while (--p > buf) {
+     char ch = *p;
+     if (ch == '0') {
+       *p = '\0'; /* zap trailing zeros */
+       continue;
+     }
+     if (ch == '.')
+       *p = '\0'; /* zap trailing dot */
+     break;
+   }
+   fputs(buf, fp);
+ }
+ 
+ static int svg_color_is_black(int c)
+ {
+   /* gfx_color_t is RRGGBBAA, svg can use #RRGGBB like html */
+   c = (int)((c >> 8) & 0xFFFFFF);
+   return !c;
+ }
+ 
+ static void svg_write_color(FILE *fp, int c)
+ {
+   /* gfx_color_t is RRGGBBAA, svg can use #RRGGBB like html */
+   c = (int)((c >> 8) & 0xFFFFFF);
+   if ((c & 0x0F0F0F) == ((c >> 4) & 0x0F0F0F)) {
+     /* css2 short form, #rgb is #rrggbb, not #r0g0b0 */
+     fprintf(fp, "#%03X",
+           ( ((c >> 8) & 0xF00)
+           | ((c >> 4) & 0x0F0)
+           | ( c       & 0x00F)));
+   } else {
+     fprintf(fp, "#%06X", c);
+   }
+ }
+ 
+ static int svg_is_int_step(double a, double b)
+ {
+   double diff = fabs(a - b);
+   return floor(diff) == diff;
+ }
+ 
+ static int svg_path_straight_segment(FILE *fp,
+     double lastA, double currentA, double currentB,
+     gfx_node_t *node,
+     int segment_idx, int isx, char absChar, char relChar)
+ {
+   if (!svg_is_int_step(lastA, currentA)) {
+     putc(absChar, fp);
+     svg_write_number(fp, currentA);
+     return 0;
+   }
+   if (segment_idx < node->points - 1) {
+     ArtVpath *vec = node->path + segment_idx + 1;
+     if (vec->code == ART_LINETO) {
+       double nextA = (isx ? vec->x : vec->y) - LINEOFFSET;
+       double nextB = (isx ? vec->y : vec->x) - LINEOFFSET;
+       if (nextB == currentB
+           && ((currentA >= lastA) == (nextA >= currentA))
+           && svg_is_int_step(currentA, nextA)) {
+         return 1; /* skip to next as it is a straight line  */
+       }
+     }
+   }
+   putc(relChar, fp);
+   svg_write_number(fp, currentA - lastA);
+   return 0;
+ }
+ 
+ static void svg_path(FILE *fp, gfx_node_t *node, int multi)
+ {
+   int i;
+   double lastX = 0, lastY = 0;
+   /* for straight lines <path..> tags take less space than
+      <line..> tags because of the efficient packing
+      in the 'd' attribute */
+   svg_start_tag(fp, "path");
+   if (!multi) {
+     fputs(" stroke-width=\"", fp);
+     svg_write_number(fp, node->size);
+     fputs("\" stroke=\"", fp);
+     svg_write_color(fp, node->color);
+     fputs("\" fill=\"none\"", fp);
+   }
+   fputs(" d=\"", fp);
+   /* specification of the 'd' attribute: */
+   /* http://www.w3.org/TR/SVG/paths.html#PathDataGeneralInformation */
+   for (i = 0; i < node->points; i++) {
+     ArtVpath *vec = node->path + i;
+     double x = vec->x - LINEOFFSET;
+     double y = vec->y - LINEOFFSET;
+     switch (vec->code) {
+     case ART_MOVETO_OPEN: /* fall-through */
+     case ART_MOVETO:
+       putc('M', fp);
+       svg_write_number(fp, x);
+       putc(',', fp);
+       svg_write_number(fp, y);
+       break;
+     case ART_LINETO:
+       /* try optimize filesize by using minimal lineto commands */
+       /* without introducing rounding errors. */
+       if (x == lastX) {
+         if (svg_path_straight_segment(fp, lastY, y, x, node, i, 0, 'V', 'v'))
+           continue;
+       } else if (y == lastY) {
+         if (svg_path_straight_segment(fp, lastX, x, y, node, i, 1, 'H', 'h'))
+           continue;
+       } else {
+         putc('L', fp);
+         svg_write_number(fp, x);
+         putc(',', fp);
+         svg_write_number(fp, y);
+       }
+       break;
+     case ART_CURVETO: break; /* unsupported */
+     case ART_END: break; /* nop */
+     }
+     lastX = x;
+     lastY = y;
+   }
+   fputs("\"", fp);
+   svg_close_tag_empty_node(fp);
+ }
+ 
+ static void svg_multi_path(FILE *fp, gfx_node_t **nodeR)
+ {
+   /* optimize for multiple paths with the same color, penwidth, etc. */
+   int num = 1;
+   gfx_node_t *node = *nodeR;
+   gfx_node_t *next = node->next;
+   while (next) {
+     if (next->type != node->type
+         || next->size != node->size
+         || next->color != node->color)
+       break;
+     next = next->next;
+     num++;
+   }
+   if (num == 1) {
+     svg_path(fp, node, 0);
+     return;
+   }
+   svg_start_tag(fp, "g");
+   fputs(" stroke-width=\"", fp);
+   svg_write_number(fp, node->size);
+   fputs("\" stroke=\"", fp);
+   svg_write_color(fp, node->color);
+   fputs("\" fill=\"none\"", fp);
+   svg_close_tag(fp);
+   while (num && node) {
+     svg_path(fp, node, 1);
+     if (!--num)
+       break;
+     node = node->next;
+     *nodeR = node;
+   }
+   svg_end_tag(fp, "g");
+ }
+ 
+ static void svg_area(FILE *fp, gfx_node_t *node)
+ {
+   int i;
+   double startX = 0, startY = 0;
+   svg_start_tag(fp, "polygon");
+   fputs(" fill=\"", fp);
+   svg_write_color(fp, node->color);
+   fputs("\" points=\"", fp);
+   for (i = 0; i < node->points; i++) {
+     ArtVpath *vec = node->path + i;
+     double x = vec->x - LINEOFFSET;
+     double y = vec->y - LINEOFFSET;
+     switch (vec->code) {
+       case ART_MOVETO_OPEN: /* fall-through */
+       case ART_MOVETO:
+         svg_write_number(fp, x);
+         putc(',', fp);
+         svg_write_number(fp, y);
+         startX = x;
+         startY = y;
+         break;
+       case ART_LINETO:
+         if (i == node->points - 2
+ 			&& node->path[i + 1].code == ART_END
+             && fabs(x - startX) < 0.001 && fabs(y - startY) < 0.001) {
+           break; /* poly area always closed, no need for last point */
+         }
+         putc(' ', fp);
+         svg_write_number(fp, x);
+         putc(',', fp);
+         svg_write_number(fp, y);
+         break;
+       case ART_CURVETO: break; /* unsupported */
+       case ART_END: break; /* nop */
+     }
+   }
+   fputs("\"", fp);
+   svg_close_tag_empty_node(fp);
+ }
+ 
+ static void svg_text(FILE *fp, gfx_node_t *node)
+ {
+   double x = node->x - LINEOFFSET;
+   double y = node->y - LINEOFFSET;
+   if (node->angle != 0) {
+     svg_start_tag(fp, "g");
+     fputs(" transform=\"translate(", fp);
+     svg_write_number(fp, x);
+     fputs(",", fp);
+     svg_write_number(fp, y);
+     fputs(") rotate(", fp);
+     svg_write_number(fp, node->angle);
+     fputs(")\"", fp);
+     x = y = 0;
+     svg_close_tag(fp);
+   }
+   switch (node->valign) {
+   case GFX_V_TOP:  y += node->size; break;
+   case GFX_V_CENTER: y += node->size / 2; break;
+   case GFX_V_BOTTOM: break;
+   case GFX_V_NULL: break;
+   }
+   svg_start_tag(fp, "text");
+   fputs(" x=\"", fp);
+   svg_write_number(fp, x);
+   fputs("\" y=\"", fp);
+   svg_write_number(fp, y);
+   fputs("\" font-size=\"", fp);
+   svg_write_number(fp, node->size);
+   fputs("\"", fp);
+   if (!svg_color_is_black(node->color)) {
+     fputs(" fill=\"", fp);
+     svg_write_color(fp, node->color);
+     fputs("\"", fp);
+   }
+   switch (node->halign) {
+   case GFX_H_RIGHT:  fputs(" text-anchor=\"end\"", fp); break;
+   case GFX_H_CENTER: fputs(" text-anchor=\"middle\"", fp); break;
+   case GFX_H_LEFT: break;
+   case GFX_H_NULL: break;
+   }
+   svg_close_tag_single_line(fp);
+   /* support for node->tabwidth missing */
+   svg_write_text(fp, node->text);
+   svg_end_tag(fp, "text");
+   if (node->angle != 0)
+     svg_end_tag(fp, "g");
+ }
+ 
+ int       gfx_render_svg (gfx_canvas_t *canvas,
+                 art_u32 width, art_u32 height,
+                 double zoom,
+                 gfx_color_t background, FILE *fp){
+   gfx_node_t *node = canvas->firstnode;
+   fputs(
+ "<?xml version=\"1.0\" standalone=\"yes\"?>\n"
+ "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\"\n"
+ "   \"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd\">\n"
+ "<!--\n"
+ "   SVG file created by RRDtool,\n"
+ "   Tobias Oetiker <tobi@oetike.ch>, http://tobi.oetiker.ch\n"
+ "\n"
+ "   The width/height attributes in the outhermost svg node\n"
+ "   are just default sizes for the browser which is used\n"
+ "   if the svg file is openened directly without being\n"
+ "   embedded in an html file.\n"
+ "   The viewBox is the local coord system for rrdtool.\n"
+ "-->\n", fp);
+   svg_start_tag(fp, "svg");
+   fputs(" width=\"", fp);
+   svg_write_number(fp, width * zoom);
+   fputs("\" height=\"", fp);
+   svg_write_number(fp, height * zoom);
+   fputs("\" x=\"0\" y=\"0\" viewBox=\"", fp);
+   svg_write_number(fp, -LINEOFFSET);
+   fputs(" ", fp);
+   svg_write_number(fp, -LINEOFFSET);
+   fputs(" ", fp);
+   svg_write_number(fp, width - LINEOFFSET);
+   fputs(" ", fp);
+   svg_write_number(fp, height - LINEOFFSET);
+   fputs("\" preserveAspectRatio=\"xMidYMid\"", fp);
+   fputs(" font-family=\"Helvetica\"", fp); /* default font */
+   svg_close_tag(fp);
+   svg_start_tag(fp, "rect");
+   fprintf(fp, " x=\"0\" y=\"0\" width=\"%d\" height=\"%d\"", width, height);
+   fputs(" style=\"fill:", fp);
+   svg_write_color(fp, background);
+   fputs("\"", fp);
+   svg_close_tag_empty_node(fp);
+   while (node) {
+     switch (node->type) {
+     case GFX_LINE:
+       svg_multi_path(fp, &node);
+       break;
+     case GFX_AREA:
+       svg_area(fp, node);
+       break;
+     case GFX_TEXT:
+       svg_text(fp, node);
+     }
+     node = node->next;
+   }
+   svg_end_tag(fp, "svg");
+   return 0;
+ }
diff --git a/src/rrd_gfx.h b/src/rrd_gfx.h
index 808b7c4..504f425 100644
--- a/src/rrd_gfx.h
+++ b/src/rrd_gfx.h
@@ -25,6 +25,7 @@ typedef struct  gfx_node_t {
   char *filename;             /* font or image filename */
   char *text;
   double        x,y;          /* position */
+  double      angle;
   enum gfx_h_align_en halign; /* text alignement */
   enum gfx_v_align_en valign; /* text alignement */
   double        tabwidth; 
@@ -86,5 +87,10 @@ int           gfx_destroy    (gfx_canvas_t *canvas);
 
 #endif
 
+/* turn graph into an svg image */
+int       gfx_render_svg (gfx_canvas_t *canvas,
+                              art_u32 width, art_u32 height,
+                              double zoom,
+                              gfx_color_t background, FILE *fo);
 
 
diff --git a/src/rrd_graph.h b/src/rrd_graph.h
index d222f9a..8fb96d6 100644
--- a/src/rrd_graph.h
+++ b/src/rrd_graph.h
@@ -25,7 +25,7 @@ enum gf_en {GF_PRINT=0,GF_GPRINT,GF_COMMENT,GF_HRULE,GF_VRULE,GF_LINE,
 	    GF_DEF, GF_CDEF, GF_VDEF,
 	    GF_PART};
 
-enum if_en {IF_PNG=0};
+enum if_en {IF_PNG=0,IF_SVG};
 
 enum vdef_op_en {
 		 VDEF_MAXIMUM	/* like the MAX in (G)PRINT */