lib/diasvgrenderer.c

   1 /* Dia -- an diagram creation/manipulation program
   2  * Copyright (C) 1998 Alexander Larsson
   3  *
   4  * render_svg.c - an SVG renderer for dia, based on render_eps.c
   5  * Copyright (C) 1999, 2000 James Henstridge
   6  *
   7  * diasvgrenderer.c - refactoring of the above to serve as the
   8  *                    base class for plug-ins/svg/render_svg.c and
   9  *                    plug-ins/shape/shape-export.c
  10  *   Copyright (C) 2002, Hans Breuer
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 #include <config.h>
  28
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <time.h>
  32 #include <math.h>
  33 #include <glib.h>
  34 #ifdef HAVE_UNISTD_H
  35 #include <unistd.h>
  36 #endif
  37
  38 #include <libxml/entities.h>
  39 #include <libxml/tree.h>
  40 #include <libxml/xmlmemory.h>
  41
  42 #include "geometry.h"
  43 #include "intl.h"
  44 #include "message.h"
  45 #include "dia_xml_libxml.h"
  46 #include "dia_image.h"
  47
  48 #include "diasvgrenderer.h"
  49 #include "textline.h"
  50
  51 #define DTOSTR_BUF_SIZE G_ASCII_DTOSTR_BUF_SIZE
  52 #define dia_svg_dtostr(buf,d) \
  53         g_ascii_formatd(buf,sizeof(buf),"%g",d)
  54
  55 /* DiaSvgRenderer methods */
  56 static void
  57 begin_render(DiaRenderer *self)
  58 {
  59   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
  60
  61   renderer->linewidth = 0;
  62   renderer->linecap = "butt";
  63   renderer->linejoin = "miter";
  64   renderer->linestyle = NULL;
  65 }
  66
  67 static void
  68 end_render(DiaRenderer *self)
  69 {
  70   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
  71   g_free(renderer->linestyle);
  72
  73   xmlSetDocCompressMode(renderer->doc, 0);
  74   xmlDiaSaveFile(renderer->filename, renderer->doc);
  75   g_free(renderer->filename);
  76   xmlFreeDoc(renderer->doc);
  77 }
  78
  79 static void
  80 set_linewidth(DiaRenderer *self, real linewidth)
  81 {  /* 0 == hairline **/
  82   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
  83
  84   if (linewidth == 0)
  85     renderer->linewidth = 0.001;
  86   else
  87     renderer->linewidth = linewidth;
  88 }
  89
  90 static void
  91 set_linecaps(DiaRenderer *self, LineCaps mode)
  92 {
  93   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
  94
  95   switch(mode) {
  96   case LINECAPS_BUTT:
  97     renderer->linecap = "butt";
  98     break;
  99   case LINECAPS_ROUND:
 100     renderer->linecap = "round";
 101     break;
 102   case LINECAPS_PROJECTING:
 103     renderer->linecap = "square";
 104     break;
 105   default:
 106     renderer->linecap = "butt";
 107   }
 108 }
 109
 110 static void
 111 set_linejoin(DiaRenderer *self, LineJoin mode)
 112 {
 113   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 114
 115   switch(mode) {
 116   case LINEJOIN_MITER:
 117     renderer->linejoin = "miter";
 118     break;
 119   case LINEJOIN_ROUND:
 120     renderer->linejoin = "round";
 121     break;
 122   case LINEJOIN_BEVEL:
 123     renderer->linejoin = "bevel";
 124     break;
 125   default:
 126     renderer->linejoin = "miter";
 127   }
 128 }
 129
 130 static void
 131 set_linestyle(DiaRenderer *self, LineStyle mode)
 132 {
 133   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 134   real hole_width;
 135   gchar dash_length_buf[DTOSTR_BUF_SIZE];
 136   gchar dot_length_buf[DTOSTR_BUF_SIZE];
 137   gchar hole_width_buf[DTOSTR_BUF_SIZE];
 138
 139   renderer->saved_line_style = mode;
 140
 141   g_free(renderer->linestyle);
 142   switch(mode) {
 143   case LINESTYLE_SOLID:
 144     renderer->linestyle = NULL;
 145     break;
 146   case LINESTYLE_DASHED:
 147     dia_svg_dtostr(dash_length_buf, renderer->dash_length);
 148     renderer->linestyle = g_strdup_printf("%s", dash_length_buf);
 149     break;
 150   case LINESTYLE_DASH_DOT:
 151     hole_width = (renderer->dash_length - renderer->dot_length) / 2.0;
 152
 153     dia_svg_dtostr(dash_length_buf, renderer->dash_length);
 154     dia_svg_dtostr(dot_length_buf, renderer->dot_length);
 155     dia_svg_dtostr(hole_width_buf, hole_width);
 156
 157     renderer->linestyle = g_strdup_printf("%s %s %s %s",
 158                                           dash_length_buf,
 159                                           hole_width_buf,
 160                                           dot_length_buf,
 161                                           hole_width_buf );
 162     break;
 163   case LINESTYLE_DASH_DOT_DOT:
 164     hole_width = (renderer->dash_length - 2.0*renderer->dot_length) / 3.0;
 165
 166     dia_svg_dtostr(dash_length_buf, renderer->dash_length);
 167     dia_svg_dtostr(dot_length_buf, renderer->dot_length);
 168     dia_svg_dtostr(hole_width_buf, hole_width);
 169
 170     renderer->linestyle = g_strdup_printf("%s %s %s %s %s %s",
 171                                           dash_length_buf,
 172                                           hole_width_buf,
 173                                           dot_length_buf,
 174                                           hole_width_buf,
 175                                           dot_length_buf,
 176                                           hole_width_buf );
 177     break;
 178   case LINESTYLE_DOTTED:
 179
 180     dia_svg_dtostr(dot_length_buf, renderer->dot_length);
 181
 182     renderer->linestyle = g_strdup_printf("%s", dot_length_buf);
 183     break;
 184   default:
 185     renderer->linestyle = NULL;
 186   }
 187 }
 188
 189 static void
 190 set_dashlength(DiaRenderer *self, real length)
 191 {  /* dot = 20% of len */
 192   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 193
 194   if (length<0.001)
 195     length = 0.001;
 196
 197   renderer->dash_length = length;
 198   renderer->dot_length = length*0.2;
 199
 200   set_linestyle(self, renderer->saved_line_style);
 201 }
 202
 203 static void
 204 set_fillstyle(DiaRenderer *self, FillStyle mode)
 205 {
 206   switch(mode) {
 207   case FILLSTYLE_SOLID:
 208     break;
 209   default:
 210     message_error("svg_renderer: Unsupported fill mode specified!\n");
 211   }
 212 }
 213
 214 /* the return value of this function should not be saved anywhere */
 215 static const gchar *
 216 get_draw_style(DiaSvgRenderer *renderer,
 217                Color *colour)
 218 {
 219   static GString *str = NULL;
 220   gchar linewidth_buf[DTOSTR_BUF_SIZE];
 221
 222   if (!str) str = g_string_new(NULL);
 223   g_string_truncate(str, 0);
 224
 225   /* TODO(CHECK): the shape-export didn't have 'fill: none' here */
 226   g_string_sprintf(str, "fill: none; fill-opacity:0; stroke-width: %s", dia_svg_dtostr(linewidth_buf, renderer->linewidth) );
 227   if (strcmp(renderer->linecap, "butt"))
 228     g_string_sprintfa(str, "; stroke-linecap: %s", renderer->linecap);
 229   if (strcmp(renderer->linejoin, "miter"))
 230     g_string_sprintfa(str, "; stroke-linejoin: %s", renderer->linejoin);
 231   if (renderer->linestyle)
 232     g_string_sprintfa(str, "; stroke-dasharray: %s", renderer->linestyle);
 233
 234   if (colour)
 235     g_string_sprintfa(str, "; stroke: #%02x%02x%02x",
 236                       (int)ceil(255*colour->red), (int)ceil(255*colour->green),
 237                       (int)ceil(255*colour->blue));
 238
 239   return str->str;
 240 }
 241
 242 /* the return value of this function should not be saved anywhere */
 243 static const gchar *
 244 get_fill_style(DiaSvgRenderer *renderer,
 245                Color *colour)
 246 {
 247   static GString *str = NULL;
 248
 249   if (!str) str = g_string_new(NULL);
 250
 251   g_string_sprintf(str, "fill: #%02x%02x%02x",
 252                    (int)ceil(255*colour->red), (int)ceil(255*colour->green),
 253                    (int)ceil(255*colour->blue));
 254
 255   return str->str;
 256 }
 257
 258 static void
 259 draw_line(DiaRenderer *self,
 260           Point *start, Point *end,
 261           Color *line_colour)
 262 {
 263   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 264   xmlNodePtr node;
 265   gchar d_buf[DTOSTR_BUF_SIZE];
 266
 267   node = xmlNewChild(renderer->root, renderer->svg_name_space, "line", NULL);
 268
 269   xmlSetProp(node, "style", get_draw_style(renderer, line_colour));
 270
 271   dia_svg_dtostr(d_buf, start->x);
 272   xmlSetProp(node, "x1", d_buf);
 273   dia_svg_dtostr(d_buf, start->y);
 274   xmlSetProp(node, "y1", d_buf);
 275   dia_svg_dtostr(d_buf, end->x);
 276   xmlSetProp(node, "x2", d_buf);
 277   dia_svg_dtostr(d_buf, end->y);
 278   xmlSetProp(node, "y2", d_buf);
 279 }
 280
 281 static void
 282 draw_polyline(DiaRenderer *self,
 283               Point *points, int num_points,
 284               Color *line_colour)
 285 {
 286   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 287   int i;
 288   xmlNodePtr node;
 289   GString *str;
 290   gchar px_buf[DTOSTR_BUF_SIZE];
 291   gchar py_buf[DTOSTR_BUF_SIZE];
 292
 293   node = xmlNewChild(renderer->root, renderer->svg_name_space, "polyline", NULL);
 294
 295   xmlSetProp(node, "style", get_draw_style(renderer, line_colour));
 296
 297   str = g_string_new(NULL);
 298   for (i = 0; i < num_points; i++)
 299     g_string_sprintfa(str, "%s,%s ",
 300                       dia_svg_dtostr(px_buf, points[i].x),
 301                       dia_svg_dtostr(py_buf, points[i].y) );
 302   xmlSetProp(node, "points", str->str);
 303   g_string_free(str, TRUE);
 304 }
 305
 306 static void
 307 draw_polygon(DiaRenderer *self,
 308               Point *points, int num_points,
 309               Color *line_colour)
 310 {
 311   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 312   int i;
 313   xmlNodePtr node;
 314   GString *str;
 315   gchar px_buf[DTOSTR_BUF_SIZE];
 316   gchar py_buf[DTOSTR_BUF_SIZE];
 317
 318   node = xmlNewChild(renderer->root, renderer->svg_name_space, "polygon", NULL);
 319
 320   xmlSetProp(node, "style", get_draw_style(renderer, line_colour));
 321
 322   str = g_string_new(NULL);
 323   for (i = 0; i < num_points; i++)
 324     g_string_sprintfa(str, "%s,%s ",
 325                       dia_svg_dtostr(px_buf, points[i].x),
 326                       dia_svg_dtostr(py_buf, points[i].y) );
 327   xmlSetProp(node, "points", str->str);
 328   g_string_free(str, TRUE);
 329 }
 330
 331 static void
 332 fill_polygon(DiaRenderer *self,
 333               Point *points, int num_points,
 334               Color *colour)
 335 {
 336   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 337   int i;
 338   xmlNodePtr node;
 339   GString *str;
 340   gchar px_buf[DTOSTR_BUF_SIZE];
 341   gchar py_buf[DTOSTR_BUF_SIZE];
 342
 343   node = xmlNewChild(renderer->root, renderer->svg_name_space, "polygon", NULL);
 344
 345   xmlSetProp(node, "style", get_fill_style(renderer, colour));
 346
 347   str = g_string_new(NULL);
 348   for (i = 0; i < num_points; i++)
 349     g_string_sprintfa(str, "%s,%s ",
 350                       dia_svg_dtostr(px_buf, points[i].x),
 351                       dia_svg_dtostr(py_buf, points[i].y) );
 352   xmlSetProp(node, "points", str->str);
 353   g_string_free(str, TRUE);
 354 }
 355
 356 static void
 357 draw_rect(DiaRenderer *self,
 358           Point *ul_corner, Point *lr_corner,
 359           Color *colour)
 360 {
 361   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 362   xmlNodePtr node;
 363   gchar d_buf[DTOSTR_BUF_SIZE];
 364
 365   node = xmlNewChild(renderer->root, NULL, "rect", NULL);
 366
 367   xmlSetProp(node, "style", get_draw_style(renderer, colour));
 368
 369   dia_svg_dtostr(d_buf, ul_corner->x);
 370   xmlSetProp(node, "x", d_buf);
 371   dia_svg_dtostr(d_buf, ul_corner->y);
 372   xmlSetProp(node, "y", d_buf);
 373   dia_svg_dtostr(d_buf, lr_corner->x - ul_corner->x);
 374   xmlSetProp(node, "width", d_buf);
 375   dia_svg_dtostr(d_buf, lr_corner->y - ul_corner->y);
 376   xmlSetProp(node, "height", d_buf);
 377 }
 378
 379 static void
 380 fill_rect(DiaRenderer *self,
 381           Point *ul_corner, Point *lr_corner,
 382           Color *colour)
 383 {
 384   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 385   xmlNodePtr node;
 386   gchar d_buf[DTOSTR_BUF_SIZE];
 387
 388   node = xmlNewChild(renderer->root, renderer->svg_name_space, "rect", NULL);
 389
 390   xmlSetProp(node, "style", get_fill_style(renderer, colour));
 391
 392   dia_svg_dtostr(d_buf, ul_corner->x);
 393   xmlSetProp(node, "x", d_buf);
 394   dia_svg_dtostr(d_buf, ul_corner->y);
 395   xmlSetProp(node, "y", d_buf);
 396   dia_svg_dtostr(d_buf, lr_corner->x - ul_corner->x);
 397   xmlSetProp(node, "width", d_buf);
 398   dia_svg_dtostr(d_buf, lr_corner->y - ul_corner->y);
 399   xmlSetProp(node, "height", d_buf);
 400 }
 401
 402 static void
 403 draw_arc(DiaRenderer *self,
 404          Point *center,
 405          real width, real height,
 406          real angle1, real angle2,
 407          Color *colour)
 408 {
 409   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 410   xmlNodePtr node;
 411   char buf[512];
 412   real rx = width / 2, ry = height / 2;
 413   real sx=center->x + rx*cos(angle1*G_PI/180);
 414   real sy=center->y - ry*sin(angle1*G_PI/180);
 415   real ex=center->x + rx*cos(angle2*G_PI/180);
 416   real ey=center->y - ry*sin(angle2*G_PI/180);
 417   int swp = 0; /* always drawin negative direction */
 418   int large_arc = (angle2 - angle1 >= 180);
 419   gchar sx_buf[DTOSTR_BUF_SIZE];
 420   gchar sy_buf[DTOSTR_BUF_SIZE];
 421   gchar rx_buf[DTOSTR_BUF_SIZE];
 422   gchar ry_buf[DTOSTR_BUF_SIZE];
 423   gchar ex_buf[DTOSTR_BUF_SIZE];
 424   gchar ey_buf[DTOSTR_BUF_SIZE];
 425
 426   node = xmlNewChild(renderer->root, renderer->svg_name_space, "path", NULL);
 427
 428   xmlSetProp(node, "style", get_draw_style(renderer, colour));
 429
 430   g_snprintf(buf, sizeof(buf), "M %s,%s A %s,%s 0 %d %d %s,%s",
 431              dia_svg_dtostr(sx_buf, sx), dia_svg_dtostr(sy_buf, sy),
 432              dia_svg_dtostr(rx_buf, rx), dia_svg_dtostr(ry_buf, ry),
 433              large_arc, swp,
 434              dia_svg_dtostr(ex_buf, ex), dia_svg_dtostr(ey_buf, ey) );
 435
 436   xmlSetProp(node, "d", buf);
 437 }
 438
 439 static void
 440 fill_arc(DiaRenderer *self,
 441          Point *center,
 442          real width, real height,
 443          real angle1, real angle2,
 444          Color *colour)
 445 {
 446   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 447   xmlNodePtr node;
 448   char buf[512];
 449   real rx = width / 2, ry = height / 2;
 450   real sx=center->x + rx*cos(angle1*G_PI/180);
 451   real sy=center->y - ry*sin(angle1*G_PI/180);
 452   real ex=center->x + rx*cos(angle2*G_PI/180);
 453   real ey=center->y - ry*sin(angle2*G_PI/180);
 454   int swp = 0; /* always drawin negative direction */
 455   int large_arc = (angle2 - angle1 >= 180);
 456   gchar sx_buf[DTOSTR_BUF_SIZE];
 457   gchar sy_buf[DTOSTR_BUF_SIZE];
 458   gchar rx_buf[DTOSTR_BUF_SIZE];
 459   gchar ry_buf[DTOSTR_BUF_SIZE];
 460   gchar ex_buf[DTOSTR_BUF_SIZE];
 461   gchar ey_buf[DTOSTR_BUF_SIZE];
 462   gchar cx_buf[DTOSTR_BUF_SIZE];
 463   gchar cy_buf[DTOSTR_BUF_SIZE];
 464
 465   node = xmlNewChild(renderer->root, NULL, "path", NULL);
 466
 467   xmlSetProp(node, "style", get_fill_style(renderer, colour));
 468
 469   g_snprintf(buf, sizeof(buf), "M %s,%s A %s,%s 0 %d %d %s,%s L %s,%s z",
 470              dia_svg_dtostr(sx_buf, sx), dia_svg_dtostr(sy_buf, sy),
 471              dia_svg_dtostr(rx_buf, rx), dia_svg_dtostr(ry_buf, ry),
 472              large_arc, swp,
 473              dia_svg_dtostr(ex_buf, ex), dia_svg_dtostr(ey_buf, ey),
 474              dia_svg_dtostr(cx_buf, center->x),
 475              dia_svg_dtostr(cy_buf, center->y) );
 476
 477   xmlSetProp(node, "d", buf);
 478 }
 479
 480 static void
 481 draw_ellipse(DiaRenderer *self,
 482              Point *center,
 483              real width, real height,
 484              Color *colour)
 485 {
 486   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 487   xmlNodePtr node;
 488   gchar d_buf[DTOSTR_BUF_SIZE];
 489
 490   node = xmlNewChild(renderer->root, renderer->svg_name_space, "ellipse", NULL);
 491
 492   xmlSetProp(node, "style", get_draw_style(renderer, colour));
 493
 494   dia_svg_dtostr(d_buf, center->x);
 495   xmlSetProp(node, "cx", d_buf);
 496   dia_svg_dtostr(d_buf, center->y);
 497   xmlSetProp(node, "cy", d_buf);
 498   dia_svg_dtostr(d_buf, width / 2);
 499   xmlSetProp(node, "rx", d_buf);
 500   dia_svg_dtostr(d_buf, height / 2);
 501   xmlSetProp(node, "ry", d_buf);
 502 }
 503
 504 static void
 505 fill_ellipse(DiaRenderer *self,
 506              Point *center,
 507              real width, real height,
 508              Color *colour)
 509 {
 510   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 511   xmlNodePtr node;
 512   gchar d_buf[DTOSTR_BUF_SIZE];
 513
 514   node = xmlNewChild(renderer->root, renderer->svg_name_space, "ellipse", NULL);
 515
 516   xmlSetProp(node, "style", get_fill_style(renderer, colour));
 517
 518   dia_svg_dtostr(d_buf, center->x);
 519   xmlSetProp(node, "cx", d_buf);
 520   dia_svg_dtostr(d_buf, center->y);
 521   xmlSetProp(node, "cy", d_buf);
 522   dia_svg_dtostr(d_buf, width / 2);
 523   xmlSetProp(node, "rx", d_buf);
 524   dia_svg_dtostr(d_buf, height / 2);
 525   xmlSetProp(node, "ry", d_buf);
 526 }
 527
 528 static void
 529 draw_bezier(DiaRenderer *self,
 530             BezPoint *points,
 531             int numpoints,
 532             Color *colour)
 533 {
 534   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 535   int i;
 536   xmlNodePtr node;
 537   GString *str;
 538   gchar p1x_buf[DTOSTR_BUF_SIZE];
 539   gchar p1y_buf[DTOSTR_BUF_SIZE];
 540   gchar p2x_buf[DTOSTR_BUF_SIZE];
 541   gchar p2y_buf[DTOSTR_BUF_SIZE];
 542   gchar p3x_buf[DTOSTR_BUF_SIZE];
 543   gchar p3y_buf[DTOSTR_BUF_SIZE];
 544
 545   node = xmlNewChild(renderer->root, renderer->svg_name_space, "path", NULL);
 546
 547   xmlSetProp(node, "style", get_draw_style(renderer, colour));
 548
 549   str = g_string_new(NULL);
 550
 551   if (points[0].type != BEZ_MOVE_TO)
 552     g_warning("first BezPoint must be a BEZ_MOVE_TO");
 553
 554   g_string_sprintf(str, "M %s %s",
 555                    dia_svg_dtostr(p1x_buf, (gdouble) points[0].p1.x),
 556                    dia_svg_dtostr(p1y_buf, (gdouble) points[0].p1.y) );
 557
 558   for (i = 1; i < numpoints; i++)
 559     switch (points[i].type) {
 560     case BEZ_MOVE_TO:
 561       g_warning("only first BezPoint can be a BEZ_MOVE_TO");
 562       break;
 563     case BEZ_LINE_TO:
 564       g_string_sprintfa(str, " L %s,%s",
 565                         dia_svg_dtostr(p1x_buf, (gdouble) points[i].p1.x),
 566                         dia_svg_dtostr(p1y_buf, (gdouble) points[i].p1.y) );
 567       break;
 568     case BEZ_CURVE_TO:
 569       g_string_sprintfa(str, " C %s,%s %s,%s %s,%s",
 570                         dia_svg_dtostr(p1x_buf, (gdouble) points[i].p1.x),
 571                         dia_svg_dtostr(p1y_buf, (gdouble) points[i].p1.y),
 572                         dia_svg_dtostr(p2x_buf, (gdouble) points[i].p2.x),
 573                         dia_svg_dtostr(p2y_buf, (gdouble) points[i].p2.y),
 574                         dia_svg_dtostr(p3x_buf, (gdouble) points[i].p3.x),
 575                         dia_svg_dtostr(p3y_buf, (gdouble) points[i].p3.y) );
 576       break;
 577     }
 578   xmlSetProp(node, "d", str->str);
 579   g_string_free(str, TRUE);
 580 }
 581
 582 static void
 583 fill_bezier(DiaRenderer *self,
 584             BezPoint *points, /* Last point must be same as first point */
 585             int numpoints,
 586             Color *colour)
 587 {
 588   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 589   int i;
 590   xmlNodePtr node;
 591   GString *str;
 592   gchar p1x_buf[DTOSTR_BUF_SIZE];
 593   gchar p1y_buf[DTOSTR_BUF_SIZE];
 594   gchar p2x_buf[DTOSTR_BUF_SIZE];
 595   gchar p2y_buf[DTOSTR_BUF_SIZE];
 596   gchar p3x_buf[DTOSTR_BUF_SIZE];
 597   gchar p3y_buf[DTOSTR_BUF_SIZE];
 598
 599   node = xmlNewChild(renderer->root, renderer->svg_name_space, "path", NULL);
 600
 601   xmlSetProp(node, "style", get_fill_style(renderer, colour));
 602
 603   str = g_string_new(NULL);
 604
 605   if (points[0].type != BEZ_MOVE_TO)
 606     g_warning("first BezPoint must be a BEZ_MOVE_TO");
 607
 608   g_string_sprintf(str, "M %s %s",
 609                    dia_svg_dtostr(p1x_buf, (gdouble) points[0].p1.x),
 610                    dia_svg_dtostr(p1y_buf, (gdouble) points[0].p1.y) );
 611
 612   for (i = 1; i < numpoints; i++)
 613     switch (points[i].type) {
 614     case BEZ_MOVE_TO:
 615       g_warning("only first BezPoint can be a BEZ_MOVE_TO");
 616       break;
 617     case BEZ_LINE_TO:
 618       g_string_sprintfa(str, " L %s,%s",
 619                         dia_svg_dtostr(p1x_buf, (gdouble) points[i].p1.x),
 620                         dia_svg_dtostr(p1y_buf, (gdouble) points[i].p1.y) );
 621       break;
 622     case BEZ_CURVE_TO:
 623       g_string_sprintfa(str, " C %s,%s %s,%s %s,%s",
 624                         dia_svg_dtostr(p1x_buf, (gdouble) points[i].p1.x),
 625                         dia_svg_dtostr(p1y_buf, (gdouble) points[i].p1.y),
 626                         dia_svg_dtostr(p2x_buf, (gdouble) points[i].p2.x),
 627                         dia_svg_dtostr(p2y_buf, (gdouble) points[i].p2.y),
 628                         dia_svg_dtostr(p3x_buf, (gdouble) points[i].p3.x),
 629                         dia_svg_dtostr(p3y_buf, (gdouble) points[i].p3.y) );
 630       break;
 631     }
 632   g_string_append(str, "z");
 633   xmlSetProp(node, "d", str->str);
 634   g_string_free(str, TRUE);
 635 }
 636
 637 static void
 638 draw_string(DiaRenderer *self,
 639             const char *text,
 640             Point *pos, Alignment alignment,
 641             Color *colour)
 642 {
 643   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 644   xmlNodePtr node;
 645   char *style, *tmp;
 646   real saved_width;
 647   gchar d_buf[DTOSTR_BUF_SIZE];
 648
 649   node = xmlNewChild(renderer->root, renderer->svg_name_space, "text", text);
 650
 651   saved_width = renderer->linewidth;
 652   renderer->linewidth = 0.001;
 653   style = (char*)get_fill_style(renderer, colour);
 654   /* return value must not be freed */
 655   renderer->linewidth = saved_width;
 656   /* This is going to break for non-LTR texts, as SVG thinks 'start' is
 657    * 'right' for those.
 658    */
 659   switch (alignment) {
 660   case ALIGN_LEFT:
 661     style = g_strconcat(style, "; text-anchor:start", NULL);
 662     break;
 663   case ALIGN_CENTER:
 664     style = g_strconcat(style, "; text-anchor:middle", NULL);
 665     break;
 666   case ALIGN_RIGHT:
 667     style = g_strconcat(style, "; text-anchor:end", NULL);
 668     break;
 669   }
 670   tmp = g_strdup_printf("%s; font-size: %s", style,
 671                         dia_svg_dtostr(d_buf, self->font_height) );
 672   g_free (style);
 673   style = tmp;
 674
 675   if (self->font) {
 676      tmp = g_strdup_printf("%s; font-family: %s; font-style: %s; "
 677                            "font-weight: %s",style,
 678                            dia_font_get_family(self->font),
 679                            dia_font_get_slant_string(self->font),
 680                            dia_font_get_weight_string(self->font));
 681      g_free(style);
 682      style = tmp;
 683   }
 684
 685   /* have to do something about fonts here ... */
 686
 687   xmlSetProp(node, "style", style);
 688   g_free(style);
 689
 690   dia_svg_dtostr(d_buf, pos->x);
 691   xmlSetProp(node, "x", d_buf);
 692   dia_svg_dtostr(d_buf, pos->y);
 693   xmlSetProp(node, "y", d_buf);
 694 }
 695
 696
 697 static void
 698 draw_text_line(DiaRenderer *self, TextLine *text_line,
 699                Point *pos, Color *colour)
 700 {
 701   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 702   xmlNodePtr node;
 703   char *style, *tmp;
 704   real saved_width;
 705   gchar d_buf[DTOSTR_BUF_SIZE];
 706   DiaFont *font;
 707
 708   node = xmlNewChild(renderer->root, renderer->svg_name_space, "text",
 709                      text_line_get_string(text_line));
 710
 711   saved_width = renderer->linewidth;
 712   renderer->linewidth = 0.001;
 713   style = (char*)get_fill_style(renderer, colour);
 714   /* return value must not be freed */
 715   renderer->linewidth = saved_width;
 716   tmp = g_strdup_printf("%s; font-size: %s", style,
 717                         dia_svg_dtostr(d_buf, text_line_get_height(text_line)));
 718   g_free (style);
 719   style = tmp;
 720
 721   tmp = g_strdup_printf("%s; length: %s", style,
 722                         dia_svg_dtostr(d_buf, text_line_get_width(text_line)));
 723   g_free (style);
 724   style = tmp;
 725
 726   font = text_line_get_font(text_line);
 727   tmp = g_strdup_printf("%s; font-family: %s; font-style: %s; "
 728                         "font-weight: %s",style,
 729                         dia_font_get_family(font),
 730                         dia_font_get_slant_string(font),
 731                         dia_font_get_weight_string(font));
 732   g_free(style);
 733   style = tmp;
 734
 735   /* have to do something about fonts here ... */
 736
 737   xmlSetProp(node, "style", style);
 738   g_free(style);
 739
 740   dia_svg_dtostr(d_buf, pos->x);
 741   xmlSetProp(node, "x", d_buf);
 742   dia_svg_dtostr(d_buf, pos->y);
 743   xmlSetProp(node, "y", d_buf);
 744 }
 745
 746 static void
 747 draw_image(DiaRenderer *self,
 748            Point *point,
 749            real width, real height,
 750            DiaImage image)
 751 {
 752   DiaSvgRenderer *renderer = DIA_SVG_RENDERER (self);
 753   xmlNodePtr node;
 754   gchar d_buf[DTOSTR_BUF_SIZE];
 755
 756   node = xmlNewChild(renderer->root, NULL, "image", NULL);
 757
 758   dia_svg_dtostr(d_buf, point->x);
 759   xmlSetProp(node, "x", d_buf);
 760   dia_svg_dtostr(d_buf, point->y);
 761   xmlSetProp(node, "y", d_buf);
 762   dia_svg_dtostr(d_buf, width);
 763   xmlSetProp(node, "width", d_buf);
 764   dia_svg_dtostr(d_buf, height);
 765   xmlSetProp(node, "height", d_buf);
 766   xmlSetProp(node, "xlink:href", dia_image_filename(image));
 767 }
 768
 769 /* constructor */
 770 static void
 771 dia_svg_renderer_init (GTypeInstance   *instance, gpointer g_class)
 772 {
 773 }
 774
 775 static gpointer parent_class = NULL;
 776
 777 /* destructor */
 778 static void
 779 dia_svg_renderer_finalize (GObject *object)
 780 {
 781   G_OBJECT_CLASS (parent_class)->finalize (object);
 782 }
 783
 784 /* gobject boiler plate, vtable initialization  */
 785 static void dia_svg_renderer_class_init (DiaSvgRendererClass *klass);
 786
 787 GType
 788 dia_svg_renderer_get_type (void)
 789 {
 790   static GType object_type = 0;
 791
 792   if (!object_type)
 793     {
 794       static const GTypeInfo object_info =
 795       {
 796         sizeof (DiaSvgRendererClass),
 797         (GBaseInitFunc) NULL,
 798         (GBaseFinalizeFunc) NULL,
 799         (GClassInitFunc) dia_svg_renderer_class_init,
 800         NULL,           /* class_finalize */
 801         NULL,           /* class_data */
 802         sizeof (DiaSvgRenderer),
 803         0,              /* n_preallocs */
 804         dia_svg_renderer_init /* init */
 805       };
 806
 807       object_type = g_type_register_static (DIA_TYPE_RENDERER,
 808                                             "DiaSvgRenderer",
 809                                             &object_info, 0);
 810     }
 811
 812   return object_type;
 813 }
 814
 815 static void
 816 dia_svg_renderer_class_init (DiaSvgRendererClass *klass)
 817 {
 818   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 819   DiaRendererClass *renderer_class = DIA_RENDERER_CLASS (klass);
 820   DiaSvgRendererClass *svg_renderer_class = DIA_SVG_RENDERER_CLASS (klass);
 821
 822   parent_class = g_type_class_peek_parent (klass);
 823
 824   object_class->finalize = dia_svg_renderer_finalize;
 825
 826   /* renderer members */
 827   renderer_class->begin_render = begin_render;
 828   renderer_class->end_render   = end_render;
 829
 830   renderer_class->set_linewidth  = set_linewidth;
 831   renderer_class->set_linecaps   = set_linecaps;
 832   renderer_class->set_linejoin   = set_linejoin;
 833   renderer_class->set_linestyle  = set_linestyle;
 834   renderer_class->set_dashlength = set_dashlength;
 835   renderer_class->set_fillstyle  = set_fillstyle;
 836
 837   renderer_class->draw_line    = draw_line;
 838   renderer_class->fill_polygon = fill_polygon;
 839   renderer_class->draw_rect    = draw_rect;
 840   renderer_class->fill_rect    = fill_rect;
 841   renderer_class->draw_arc     = draw_arc;
 842   renderer_class->fill_arc     = fill_arc;
 843   renderer_class->draw_ellipse = draw_ellipse;
 844   renderer_class->fill_ellipse = fill_ellipse;
 845
 846   renderer_class->draw_string  = draw_string;
 847   renderer_class->draw_image   = draw_image;
 848
 849   /* medium level functions */
 850   renderer_class->draw_rect = draw_rect;
 851   renderer_class->draw_polyline  = draw_polyline;
 852   renderer_class->draw_polygon   = draw_polygon;
 853
 854   renderer_class->draw_bezier   = draw_bezier;
 855   renderer_class->fill_bezier   = fill_bezier;
 856 /*  renderer_class->draw_text_line  = draw_text_line;*/
 857
 858   /* svg specific */
 859   svg_renderer_class->get_draw_style = get_draw_style;
 860   svg_renderer_class->get_fill_style = get_fill_style;
 861 }
 862