1 #define __SP_CANVAS_BPATH_C__
3 /*
4 * Simple bezier bpath CanvasItem for inkscape
5 *
6 * Authors:
7 * Lauris Kaplinski <lauris@ximian.com>
8 *
9 * Copyright (C) 2001 Lauris Kaplinski and Ximian, Inc.
10 *
11 * Released under GNU GPL
12 *
13 */
15 #ifdef HAVE_CONFIG_H
16 # include "config.h"
17 #endif
18 #include "color.h"
19 #include "sp-canvas-util.h"
20 #include "inkscape-cairo.h"
21 #include "canvas-bpath.h"
22 #include "display/display-forward.h"
23 #include "display/curve.h"
24 #include "display/inkscape-cairo.h"
25 #include "libnr/nr-matrix-fns.h"
26 #include <libnr/nr-pixops.h>
27 #include <libnr/nr-convert2geom.h>
28 #include "helper/geom.h"
30 /*
31 * FIXME: The following #includes and some other content in this file (see below) should actually
32 * be in a separate file called display/canvas-text.cpp. It temporarily had to be moved here
33 * because of linker errors.
34 */
36 /**
37 #include "display-forward.h"
38 #include "sp-canvas-util.h"
39 #include "canvas-text.h"
40 #include "display/inkscape-cairo.h"
41 **/
42 #include <sstream>
43 #include <string.h>
44 #include <desktop.h>
46 /**
47 #ifdef HAVE_CONFIG_H
48 # include "config.h"
49 #endif
50 #include <color.h>
52 #include <libnr/nr-matrix-fns.h>
53 #include <libnr/nr-pixops.h>
54 **/
56 void nr_pixblock_render_bpath_rgba (Shape* theS,uint32_t color,NRRectL &area,char* destBuf,int stride);
58 static void sp_canvas_bpath_class_init (SPCanvasBPathClass *klass);
59 static void sp_canvas_bpath_init (SPCanvasBPath *path);
60 static void sp_canvas_bpath_destroy (GtkObject *object);
62 static void sp_canvas_bpath_update (SPCanvasItem *item, Geom::Matrix const &affine, unsigned int flags);
63 static void sp_canvas_bpath_render (SPCanvasItem *item, SPCanvasBuf *buf);
64 static double sp_canvas_bpath_point (SPCanvasItem *item, Geom::Point p, SPCanvasItem **actual_item);
66 static SPCanvasItemClass *parent_class;
68 GtkType
69 sp_canvas_bpath_get_type (void)
70 {
71 static GtkType type = 0;
72 if (!type) {
73 GtkTypeInfo info = {
74 (gchar *)"SPCanvasBPath",
75 sizeof (SPCanvasBPath),
76 sizeof (SPCanvasBPathClass),
77 (GtkClassInitFunc) sp_canvas_bpath_class_init,
78 (GtkObjectInitFunc) sp_canvas_bpath_init,
79 NULL, NULL, NULL
80 };
81 type = gtk_type_unique (SP_TYPE_CANVAS_ITEM, &info);
82 }
83 return type;
84 }
86 static void
87 sp_canvas_bpath_class_init (SPCanvasBPathClass *klass)
88 {
89 GtkObjectClass *object_class;
90 SPCanvasItemClass *item_class;
92 object_class = GTK_OBJECT_CLASS (klass);
93 item_class = (SPCanvasItemClass *) klass;
95 parent_class = (SPCanvasItemClass*)gtk_type_class (SP_TYPE_CANVAS_ITEM);
97 object_class->destroy = sp_canvas_bpath_destroy;
99 item_class->update = sp_canvas_bpath_update;
100 item_class->render = sp_canvas_bpath_render;
101 item_class->point = sp_canvas_bpath_point;
102 }
104 static void
105 sp_canvas_bpath_init (SPCanvasBPath * bpath)
106 {
107 bpath->fill_rgba = 0x00000000;
108 bpath->fill_rule = SP_WIND_RULE_EVENODD;
110 bpath->stroke_rgba = 0x00000000;
111 bpath->stroke_width = 1.0;
112 bpath->stroke_linejoin = SP_STROKE_LINEJOIN_MITER;
113 bpath->stroke_linecap = SP_STROKE_LINECAP_BUTT;
114 bpath->stroke_miterlimit = 11.0;
115 }
117 static void
118 sp_canvas_bpath_destroy (GtkObject *object)
119 {
120 SPCanvasBPath *cbp = SP_CANVAS_BPATH (object);
122 if (cbp->curve) {
123 cbp->curve = cbp->curve->unref();
124 }
126 if (GTK_OBJECT_CLASS (parent_class)->destroy)
127 (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
128 }
130 static void
131 sp_canvas_bpath_update (SPCanvasItem *item, Geom::Matrix const &affine, unsigned int flags)
132 {
133 SPCanvasBPath *cbp = SP_CANVAS_BPATH (item);
135 sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
137 if (((SPCanvasItemClass *) parent_class)->update)
138 ((SPCanvasItemClass *) parent_class)->update (item, affine, flags);
140 sp_canvas_item_reset_bounds (item);
142 if (!cbp->curve) return;
144 cbp->affine = affine;
146 Geom::OptRect bbox = bounds_exact_transformed(cbp->curve->get_pathvector(), affine);
148 if (bbox) {
149 item->x1 = (int)bbox->min()[Geom::X] - 1;
150 item->y1 = (int)bbox->min()[Geom::Y] - 1;
151 item->x2 = (int)bbox->max()[Geom::X] + 1;
152 item->y2 = (int)bbox->max()[Geom::Y] + 1;
153 } else {
154 item->x1 = 0;
155 item->y1 = 0;
156 item->x2 = 0;
157 item->y2 = 0;
158 }
159 sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
160 }
162 static void
163 sp_canvas_bpath_render (SPCanvasItem *item, SPCanvasBuf *buf)
164 {
165 SPCanvasBPath *cbp = SP_CANVAS_BPATH (item);
167 sp_canvas_prepare_buffer(buf);
169 Geom::Rect area (Geom::Point(buf->rect.x0, buf->rect.y0), Geom::Point(buf->rect.x1, buf->rect.y1));
171 if ( !cbp->curve ||
172 ((cbp->stroke_rgba & 0xff) == 0 && (cbp->fill_rgba & 0xff) == 0 ) ||
173 cbp->curve->get_segment_count() < 1)
174 return;
176 if (!buf->ct)
177 return;
179 bool dofill = ((cbp->fill_rgba & 0xff) != 0);
180 bool dostroke = ((cbp->stroke_rgba & 0xff) != 0);
182 cairo_set_tolerance(buf->ct, 1.25); // low quality, but good enough for canvas items
183 cairo_new_path(buf->ct);
185 if (!dofill)
186 feed_pathvector_to_cairo (buf->ct, cbp->curve->get_pathvector(), cbp->affine, area, true, 1);
187 else
188 feed_pathvector_to_cairo (buf->ct, cbp->curve->get_pathvector(), cbp->affine, area, false, 1);
190 if (dofill) {
191 // RGB / BGR
192 cairo_set_source_rgba(buf->ct, SP_RGBA32_B_F(cbp->fill_rgba), SP_RGBA32_G_F(cbp->fill_rgba), SP_RGBA32_R_F(cbp->fill_rgba), SP_RGBA32_A_F(cbp->fill_rgba));
193 cairo_set_fill_rule(buf->ct, cbp->fill_rule == SP_WIND_RULE_EVENODD? CAIRO_FILL_RULE_EVEN_ODD
194 : CAIRO_FILL_RULE_WINDING);
195 if (dostroke)
196 cairo_fill_preserve(buf->ct);
197 else
198 cairo_fill(buf->ct);
199 }
201 if (dostroke) {
202 // RGB / BGR
203 cairo_set_source_rgba(buf->ct, SP_RGBA32_B_F(cbp->stroke_rgba), SP_RGBA32_G_F(cbp->stroke_rgba), SP_RGBA32_R_F(cbp->stroke_rgba), SP_RGBA32_A_F(cbp->stroke_rgba));
204 cairo_set_line_width(buf->ct, 1);
205 if (cbp->dashes[0] != 0 && cbp->dashes[1] != 0) {
206 cairo_set_dash (buf->ct, cbp->dashes, 2, 0);
207 }
208 cairo_stroke(buf->ct);
209 }
210 }
212 static double
213 sp_canvas_bpath_point (SPCanvasItem *item, Geom::Point p, SPCanvasItem **actual_item)
214 {
215 SPCanvasBPath *cbp = SP_CANVAS_BPATH (item);
217 if ( !cbp->curve ||
218 ((cbp->stroke_rgba & 0xff) == 0 && (cbp->fill_rgba & 0xff) == 0 ) ||
219 cbp->curve->get_segment_count() < 1)
220 return NR_HUGE;
222 double width = 0.5;
223 Geom::Rect viewbox = item->canvas->getViewbox();
224 viewbox.expandBy (width);
225 double dist = NR_HUGE;
226 pathv_matrix_point_bbox_wind_distance(cbp->curve->get_pathvector(), cbp->affine, p, NULL, NULL, &dist, 0.5, &viewbox);
228 if (dist <= 1.0) {
229 *actual_item = item;
230 }
232 return dist;
233 }
235 SPCanvasItem *
236 sp_canvas_bpath_new (SPCanvasGroup *parent, SPCurve *curve)
237 {
238 g_return_val_if_fail (parent != NULL, NULL);
239 g_return_val_if_fail (SP_IS_CANVAS_GROUP (parent), NULL);
241 SPCanvasItem *item = sp_canvas_item_new (parent, SP_TYPE_CANVAS_BPATH, NULL);
243 sp_canvas_bpath_set_bpath (SP_CANVAS_BPATH (item), curve);
245 return item;
246 }
248 void
249 sp_canvas_bpath_set_bpath (SPCanvasBPath *cbp, SPCurve *curve)
250 {
251 g_return_if_fail (cbp != NULL);
252 g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
254 if (cbp->curve) {
255 cbp->curve = cbp->curve->unref();
256 }
258 if (curve) {
259 cbp->curve = curve->ref();
260 }
262 sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
263 }
265 void
266 sp_canvas_bpath_set_fill (SPCanvasBPath *cbp, guint32 rgba, SPWindRule rule)
267 {
268 g_return_if_fail (cbp != NULL);
269 g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
271 cbp->fill_rgba = rgba;
272 cbp->fill_rule = rule;
274 sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
275 }
277 void
278 sp_canvas_bpath_set_stroke (SPCanvasBPath *cbp, guint32 rgba, gdouble width, SPStrokeJoinType join, SPStrokeCapType cap, double dash, double gap)
279 {
280 g_return_if_fail (cbp != NULL);
281 g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
283 cbp->stroke_rgba = rgba;
284 cbp->stroke_width = MAX (width, 0.1);
285 cbp->stroke_linejoin = join;
286 cbp->stroke_linecap = cap;
287 cbp->dashes[0] = dash;
288 cbp->dashes[1] = gap;
290 sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
291 }
295 /*
296 * FIXME: The following code should actually be in a separate file called
297 * display/canvas-text.cpp. It temporarily had to be moved here because of linker errors.
298 */
300 static void sp_canvastext_class_init (SPCanvasTextClass *klass);
301 static void sp_canvastext_init (SPCanvasText *canvastext);
302 static void sp_canvastext_destroy (GtkObject *object);
304 static void sp_canvastext_update (SPCanvasItem *item, Geom::Matrix const &affine, unsigned int flags);
305 static void sp_canvastext_render (SPCanvasItem *item, SPCanvasBuf *buf);
307 static SPCanvasItemClass *parent_class_ct;
309 GtkType
310 sp_canvastext_get_type (void)
311 {
312 static GtkType type = 0;
314 if (!type) {
315 GtkTypeInfo info = {
316 (gchar *)"SPCanvasText",
317 sizeof (SPCanvasText),
318 sizeof (SPCanvasTextClass),
319 (GtkClassInitFunc) sp_canvastext_class_init,
320 (GtkObjectInitFunc) sp_canvastext_init,
321 NULL, NULL, NULL
322 };
323 type = gtk_type_unique (SP_TYPE_CANVAS_ITEM, &info);
324 }
325 return type;
326 }
328 static void
329 sp_canvastext_class_init (SPCanvasTextClass *klass)
330 {
331 GtkObjectClass *object_class = (GtkObjectClass *) klass;
332 SPCanvasItemClass *item_class = (SPCanvasItemClass *) klass;
334 parent_class_ct = (SPCanvasItemClass*)gtk_type_class (SP_TYPE_CANVAS_ITEM);
336 object_class->destroy = sp_canvastext_destroy;
338 item_class->update = sp_canvastext_update;
339 item_class->render = sp_canvastext_render;
340 }
342 static void
343 sp_canvastext_init (SPCanvasText *canvastext)
344 {
345 canvastext->rgba = 0x0000ff7f;
346 canvastext->s[Geom::X] = canvastext->s[Geom::Y] = 0.0;
347 canvastext->affine = Geom::identity();
348 canvastext->fontsize = 10.0;
349 canvastext->item = NULL;
350 canvastext->desktop = NULL;
351 canvastext->text = NULL;
352 }
354 static void
355 sp_canvastext_destroy (GtkObject *object)
356 {
357 g_return_if_fail (object != NULL);
358 g_return_if_fail (SP_IS_CANVASTEXT (object));
360 SPCanvasText *canvastext = SP_CANVASTEXT (object);
362 canvastext->item=NULL;
364 if (GTK_OBJECT_CLASS (parent_class_ct)->destroy)
365 (* GTK_OBJECT_CLASS (parent_class_ct)->destroy) (object);
366 }
368 // FIXME: remove this as soon as we know how to correctly determine the text extent
369 static const double arbitrary_factor = 0.7;
371 // these are set in sp_canvastext_update() and then re-used in sp_canvastext_render(), which is called afterwards
372 static double anchor_offset_x = 0;
373 static double anchor_offset_y = 0;
375 static void
376 sp_canvastext_render (SPCanvasItem *item, SPCanvasBuf *buf)
377 {
378 SPCanvasText *cl = SP_CANVASTEXT (item);
380 if (!buf->ct)
381 return;
383 guint32 rgba = cl->rgba;
384 cairo_set_source_rgba(buf->ct, SP_RGBA32_B_F(rgba), SP_RGBA32_G_F(rgba), SP_RGBA32_R_F(rgba), SP_RGBA32_A_F(rgba));
386 Geom::Point s = cl->s * cl->affine;
387 double offsetx = s[Geom::X] - buf->rect.x0;
388 double offsety = s[Geom::Y] - buf->rect.y0;
389 offsetx -= anchor_offset_x;
390 offsety += anchor_offset_y;
392 cairo_move_to(buf->ct, offsetx, offsety);
393 cairo_set_font_size(buf->ct, cl->fontsize);
394 cairo_show_text(buf->ct, cl->text);
395 cairo_stroke(buf->ct);
397 cairo_new_path(buf->ct);
398 }
400 static void
401 sp_canvastext_update (SPCanvasItem *item, Geom::Matrix const &affine, unsigned int flags)
402 {
403 SPCanvasText *cl = SP_CANVASTEXT (item);
405 sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
407 if (parent_class_ct->update)
408 (* parent_class_ct->update) (item, affine, flags);
410 sp_canvas_item_reset_bounds (item);
412 cl->affine = affine;
414 Geom::Point s = cl->s * affine;
416 // set up a temporary cairo_t to measure the text extents; it would be better to compute this in the render()
417 // method but update() seems to be called before so we don't have the information available when we need it
418 /**
419 cairo_t tmp_buf;
420 cairo_text_extents_t bbox;
421 cairo_text_extents(&tmp_buf, cl->text, &bbox);
422 **/
423 item->x1 = s[Geom::X] + 0;
424 item->y1 = s[Geom::Y] - cl->fontsize;
425 item->x2 = s[Geom::X] + cl->fontsize * strlen(cl->text);
426 item->y2 = s[Geom::Y] + cl->fontsize * 0.5; // for letters below the baseline
428 // adjust update region according to anchor shift
429 // FIXME: use the correct text extent
430 anchor_offset_x = arbitrary_factor * cl->fontsize * strlen(cl->text) * (cl->anchor_x + 1.0) / 2.0;
431 anchor_offset_y = cl->fontsize * (cl->anchor_y + 1.0) / 2.0;
432 item->x1 -= anchor_offset_x;
433 item->x2 -= anchor_offset_x;
434 item->y1 += anchor_offset_y;
435 item->y2 += anchor_offset_y;
437 sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
438 }
440 SPCanvasItem *
441 sp_canvastext_new(SPCanvasGroup *parent, SPDesktop *desktop, Geom::Point pos, gchar const *new_text)
442 {
443 SPCanvasItem *item = sp_canvas_item_new(parent, SP_TYPE_CANVASTEXT, NULL);
445 SPCanvasText *ct = SP_CANVASTEXT(item);
447 ct->desktop = desktop;
449 ct->s = pos;
450 g_free(ct->text);
451 ct->text = g_strdup(new_text);
453 // TODO: anything else to do?
455 return item;
456 }
459 void
460 sp_canvastext_set_rgba32 (SPCanvasText *ct, guint32 rgba)
461 {
462 g_return_if_fail (ct != NULL);
463 g_return_if_fail (SP_IS_CANVASTEXT (ct));
465 if (rgba != ct->rgba) {
466 SPCanvasItem *item;
467 ct->rgba = rgba;
468 item = SP_CANVAS_ITEM (ct);
469 sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
470 }
471 sp_canvas_item_request_update (SP_CANVAS_ITEM (ct));
472 }
474 #define EPSILON 1e-6
475 #define DIFFER(a,b) (fabs ((a) - (b)) > EPSILON)
477 void
478 sp_canvastext_set_coords (SPCanvasText *ct, gdouble x0, gdouble y0)
479 {
480 sp_canvastext_set_coords(ct, Geom::Point(x0, y0));
481 }
483 void
484 sp_canvastext_set_coords (SPCanvasText *ct, const Geom::Point start)
485 {
486 Geom::Point pos = ct->desktop->doc2dt(start);
488 g_return_if_fail (ct != NULL);
489 g_return_if_fail (SP_IS_CANVASTEXT (ct));
491 if (DIFFER (pos[0], ct->s[Geom::X]) || DIFFER (pos[1], ct->s[Geom::Y])) {
492 ct->s[Geom::X] = pos[0];
493 ct->s[Geom::Y] = pos[1];
494 sp_canvas_item_request_update (SP_CANVAS_ITEM (ct));
495 }
496 sp_canvas_item_request_update (SP_CANVAS_ITEM (ct));
497 }
499 void
500 sp_canvastext_set_text (SPCanvasText *ct, gchar const * new_text)
501 {
502 g_free (ct->text);
503 ct->text = g_strdup(new_text);
504 sp_canvas_item_request_update (SP_CANVAS_ITEM (ct));
505 }
507 void
508 sp_canvastext_set_number_as_text (SPCanvasText *ct, int num)
509 {
510 std::ostringstream number;
511 number << num;
512 sp_canvastext_set_text(ct, number.str().c_str());
513 }
515 void
516 sp_canvastext_set_fontsize (SPCanvasText *ct, double size)
517 {
518 ct->fontsize = size;
519 }
521 void
522 sp_canvastext_set_anchor (SPCanvasText *ct, double anchor_x, double anchor_y)
523 {
524 ct->anchor_x = anchor_x;
525 ct->anchor_y = anchor_y;
526 }
528 /*
529 Local Variables:
530 mode:c++
531 c-file-style:"stroustrup"
532 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
533 indent-tabs-mode:nil
534 fill-column:99
535 End:
536 */
537 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :