1900ed961b92abfc67a2dff92352ef6b3f843b5a
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::Rect bbox = bounds_exact_transformed(cbp->curve->get_pathvector(), affine);
148 item->x1 = (int)bbox.min()[Geom::X] - 1;
149 item->y1 = (int)bbox.min()[Geom::Y] - 1;
150 item->x2 = (int)bbox.max()[Geom::X] + 1;
151 item->y2 = (int)bbox.max()[Geom::Y] + 1;
153 sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
154 }
156 static void
157 sp_canvas_bpath_render (SPCanvasItem *item, SPCanvasBuf *buf)
158 {
159 SPCanvasBPath *cbp = SP_CANVAS_BPATH (item);
161 sp_canvas_prepare_buffer(buf);
163 Geom::Rect area (Geom::Point(buf->rect.x0, buf->rect.y0), Geom::Point(buf->rect.x1, buf->rect.y1));
165 if ( !cbp->curve ||
166 ((cbp->stroke_rgba & 0xff) == 0 && (cbp->fill_rgba & 0xff) == 0 ) ||
167 cbp->curve->get_segment_count() < 1)
168 return;
170 if (!buf->ct)
171 return;
173 bool dofill = ((cbp->fill_rgba & 0xff) != 0);
174 bool dostroke = ((cbp->stroke_rgba & 0xff) != 0);
176 cairo_set_tolerance(buf->ct, 1.25); // low quality, but good enough for canvas items
177 cairo_new_path(buf->ct);
179 if (!dofill)
180 feed_pathvector_to_cairo (buf->ct, cbp->curve->get_pathvector(), cbp->affine, area, true, 1);
181 else
182 feed_pathvector_to_cairo (buf->ct, cbp->curve->get_pathvector(), cbp->affine, area, false, 1);
184 if (dofill) {
185 // RGB / BGR
186 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));
187 cairo_set_fill_rule(buf->ct, cbp->fill_rule == SP_WIND_RULE_EVENODD? CAIRO_FILL_RULE_EVEN_ODD
188 : CAIRO_FILL_RULE_WINDING);
189 if (dostroke)
190 cairo_fill_preserve(buf->ct);
191 else
192 cairo_fill(buf->ct);
193 }
195 if (dostroke) {
196 // RGB / BGR
197 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));
198 cairo_set_line_width(buf->ct, 1);
199 if (cbp->dashes[0] != 0 && cbp->dashes[1] != 0) {
200 cairo_set_dash (buf->ct, cbp->dashes, 2, 0);
201 }
202 cairo_stroke(buf->ct);
203 }
204 }
206 static double
207 sp_canvas_bpath_point (SPCanvasItem *item, Geom::Point p, SPCanvasItem **actual_item)
208 {
209 SPCanvasBPath *cbp = SP_CANVAS_BPATH (item);
211 if ( !cbp->curve ||
212 ((cbp->stroke_rgba & 0xff) == 0 && (cbp->fill_rgba & 0xff) == 0 ) ||
213 cbp->curve->get_segment_count() < 1)
214 return NR_HUGE;
216 double width = 0.5;
217 Geom::Rect viewbox = item->canvas->getViewbox();
218 viewbox.expandBy (width);
219 double dist = NR_HUGE;
220 pathv_matrix_point_bbox_wind_distance(cbp->curve->get_pathvector(), cbp->affine, p, NULL, NULL, &dist, 0.5, &viewbox);
222 if (dist <= 1.0) {
223 *actual_item = item;
224 }
226 return dist;
227 }
229 SPCanvasItem *
230 sp_canvas_bpath_new (SPCanvasGroup *parent, SPCurve *curve)
231 {
232 g_return_val_if_fail (parent != NULL, NULL);
233 g_return_val_if_fail (SP_IS_CANVAS_GROUP (parent), NULL);
235 SPCanvasItem *item = sp_canvas_item_new (parent, SP_TYPE_CANVAS_BPATH, NULL);
237 sp_canvas_bpath_set_bpath (SP_CANVAS_BPATH (item), curve);
239 return item;
240 }
242 void
243 sp_canvas_bpath_set_bpath (SPCanvasBPath *cbp, SPCurve *curve)
244 {
245 g_return_if_fail (cbp != NULL);
246 g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
248 if (cbp->curve) {
249 cbp->curve = cbp->curve->unref();
250 }
252 if (curve) {
253 cbp->curve = curve->ref();
254 }
256 sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
257 }
259 void
260 sp_canvas_bpath_set_fill (SPCanvasBPath *cbp, guint32 rgba, SPWindRule rule)
261 {
262 g_return_if_fail (cbp != NULL);
263 g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
265 cbp->fill_rgba = rgba;
266 cbp->fill_rule = rule;
268 sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
269 }
271 void
272 sp_canvas_bpath_set_stroke (SPCanvasBPath *cbp, guint32 rgba, gdouble width, SPStrokeJoinType join, SPStrokeCapType cap, double dash, double gap)
273 {
274 g_return_if_fail (cbp != NULL);
275 g_return_if_fail (SP_IS_CANVAS_BPATH (cbp));
277 cbp->stroke_rgba = rgba;
278 cbp->stroke_width = MAX (width, 0.1);
279 cbp->stroke_linejoin = join;
280 cbp->stroke_linecap = cap;
281 cbp->dashes[0] = dash;
282 cbp->dashes[1] = gap;
284 sp_canvas_item_request_update (SP_CANVAS_ITEM (cbp));
285 }
289 /*
290 * FIXME: The following code should actually be in a separate file called
291 * display/canvas-text.cpp. It temporarily had to be moved here because of linker errors.
292 */
294 static void sp_canvastext_class_init (SPCanvasTextClass *klass);
295 static void sp_canvastext_init (SPCanvasText *canvastext);
296 static void sp_canvastext_destroy (GtkObject *object);
298 static void sp_canvastext_update (SPCanvasItem *item, Geom::Matrix const &affine, unsigned int flags);
299 static void sp_canvastext_render (SPCanvasItem *item, SPCanvasBuf *buf);
301 static SPCanvasItemClass *parent_class_ct;
303 GtkType
304 sp_canvastext_get_type (void)
305 {
306 static GtkType type = 0;
308 if (!type) {
309 GtkTypeInfo info = {
310 (gchar *)"SPCanvasText",
311 sizeof (SPCanvasText),
312 sizeof (SPCanvasTextClass),
313 (GtkClassInitFunc) sp_canvastext_class_init,
314 (GtkObjectInitFunc) sp_canvastext_init,
315 NULL, NULL, NULL
316 };
317 type = gtk_type_unique (SP_TYPE_CANVAS_ITEM, &info);
318 }
319 return type;
320 }
322 static void
323 sp_canvastext_class_init (SPCanvasTextClass *klass)
324 {
325 GtkObjectClass *object_class = (GtkObjectClass *) klass;
326 SPCanvasItemClass *item_class = (SPCanvasItemClass *) klass;
328 parent_class_ct = (SPCanvasItemClass*)gtk_type_class (SP_TYPE_CANVAS_ITEM);
330 object_class->destroy = sp_canvastext_destroy;
332 item_class->update = sp_canvastext_update;
333 item_class->render = sp_canvastext_render;
334 }
336 static void
337 sp_canvastext_init (SPCanvasText *canvastext)
338 {
339 canvastext->rgba = 0x0000ff7f;
340 canvastext->s[Geom::X] = canvastext->s[Geom::Y] = 0.0;
341 canvastext->affine = Geom::identity();
342 canvastext->fontsize = 10.0;
343 canvastext->item = NULL;
344 canvastext->desktop = NULL;
345 canvastext->text = NULL;
346 }
348 static void
349 sp_canvastext_destroy (GtkObject *object)
350 {
351 g_return_if_fail (object != NULL);
352 g_return_if_fail (SP_IS_CANVASTEXT (object));
354 SPCanvasText *canvastext = SP_CANVASTEXT (object);
356 canvastext->item=NULL;
358 if (GTK_OBJECT_CLASS (parent_class_ct)->destroy)
359 (* GTK_OBJECT_CLASS (parent_class_ct)->destroy) (object);
360 }
362 // FIXME: remove this as soon as we know how to correctly determine the text extent
363 static const double arbitrary_factor = 0.7;
365 // these are set in sp_canvastext_update() and then re-used in sp_canvastext_render(), which is called afterwards
366 static double anchor_offset_x = 0;
367 static double anchor_offset_y = 0;
369 static void
370 sp_canvastext_render (SPCanvasItem *item, SPCanvasBuf *buf)
371 {
372 SPCanvasText *cl = SP_CANVASTEXT (item);
374 if (!buf->ct)
375 return;
377 guint32 rgba = cl->rgba;
378 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));
380 Geom::Point s = cl->s * cl->affine;
381 double offsetx = s[Geom::X] - buf->rect.x0;
382 double offsety = s[Geom::Y] - buf->rect.y0;
383 offsetx -= anchor_offset_x;
384 offsety += anchor_offset_y;
386 cairo_move_to(buf->ct, offsetx, offsety);
387 cairo_set_font_size(buf->ct, cl->fontsize);
388 cairo_show_text(buf->ct, cl->text);
389 cairo_stroke(buf->ct);
391 cairo_new_path(buf->ct);
392 }
394 static void
395 sp_canvastext_update (SPCanvasItem *item, Geom::Matrix const &affine, unsigned int flags)
396 {
397 SPCanvasText *cl = SP_CANVASTEXT (item);
399 sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
401 if (parent_class_ct->update)
402 (* parent_class_ct->update) (item, affine, flags);
404 sp_canvas_item_reset_bounds (item);
406 cl->affine = affine;
408 Geom::Point s = cl->s * affine;
410 // set up a temporary cairo_t to measure the text extents; it would be better to compute this in the render()
411 // method but update() seems to be called before so we don't have the information available when we need it
412 /**
413 cairo_t tmp_buf;
414 cairo_text_extents_t bbox;
415 cairo_text_extents(&tmp_buf, cl->text, &bbox);
416 **/
417 item->x1 = s[Geom::X] + 0;
418 item->y1 = s[Geom::Y] - cl->fontsize;
419 item->x2 = s[Geom::X] + cl->fontsize * strlen(cl->text);
420 item->y2 = s[Geom::Y] + cl->fontsize * 0.5; // for letters below the baseline
422 // adjust update region according to anchor shift
423 // FIXME: use the correct text extent
424 anchor_offset_x = arbitrary_factor * cl->fontsize * strlen(cl->text) * (cl->anchor_x + 1.0) / 2.0;
425 anchor_offset_y = cl->fontsize * (cl->anchor_y + 1.0) / 2.0;
426 item->x1 -= anchor_offset_x;
427 item->x2 -= anchor_offset_x;
428 item->y1 += anchor_offset_y;
429 item->y2 += anchor_offset_y;
431 sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
432 }
434 SPCanvasItem *
435 sp_canvastext_new(SPCanvasGroup *parent, SPDesktop *desktop, Geom::Point pos, gchar const *new_text)
436 {
437 SPCanvasItem *item = sp_canvas_item_new(parent, SP_TYPE_CANVASTEXT, NULL);
439 SPCanvasText *ct = SP_CANVASTEXT(item);
441 ct->desktop = desktop;
443 ct->s = pos;
444 g_free(ct->text);
445 ct->text = g_strdup(new_text);
447 // TODO: anything else to do?
449 return item;
450 }
453 void
454 sp_canvastext_set_rgba32 (SPCanvasText *ct, guint32 rgba)
455 {
456 g_return_if_fail (ct != NULL);
457 g_return_if_fail (SP_IS_CANVASTEXT (ct));
459 if (rgba != ct->rgba) {
460 SPCanvasItem *item;
461 ct->rgba = rgba;
462 item = SP_CANVAS_ITEM (ct);
463 sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
464 }
465 sp_canvas_item_request_update (SP_CANVAS_ITEM (ct));
466 }
468 #define EPSILON 1e-6
469 #define DIFFER(a,b) (fabs ((a) - (b)) > EPSILON)
471 void
472 sp_canvastext_set_coords (SPCanvasText *ct, gdouble x0, gdouble y0)
473 {
474 sp_canvastext_set_coords(ct, Geom::Point(x0, y0));
475 }
477 void
478 sp_canvastext_set_coords (SPCanvasText *ct, const Geom::Point start)
479 {
480 Geom::Point pos = ct->desktop->doc2dt(start);
482 g_return_if_fail (ct != NULL);
483 g_return_if_fail (SP_IS_CANVASTEXT (ct));
485 if (DIFFER (pos[0], ct->s[Geom::X]) || DIFFER (pos[1], ct->s[Geom::Y])) {
486 ct->s[Geom::X] = pos[0];
487 ct->s[Geom::Y] = pos[1];
488 sp_canvas_item_request_update (SP_CANVAS_ITEM (ct));
489 }
490 sp_canvas_item_request_update (SP_CANVAS_ITEM (ct));
491 }
493 void
494 sp_canvastext_set_text (SPCanvasText *ct, gchar const * new_text)
495 {
496 g_free (ct->text);
497 ct->text = g_strdup(new_text);
498 sp_canvas_item_request_update (SP_CANVAS_ITEM (ct));
499 }
501 void
502 sp_canvastext_set_number_as_text (SPCanvasText *ct, int num)
503 {
504 std::ostringstream number;
505 number << num;
506 sp_canvastext_set_text(ct, number.str().c_str());
507 }
509 void
510 sp_canvastext_set_fontsize (SPCanvasText *ct, double size)
511 {
512 ct->fontsize = size;
513 }
515 void
516 sp_canvastext_set_anchor (SPCanvasText *ct, double anchor_x, double anchor_y)
517 {
518 ct->anchor_x = anchor_x;
519 ct->anchor_y = anchor_y;
520 }
522 /*
523 Local Variables:
524 mode:c++
525 c-file-style:"stroustrup"
526 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
527 indent-tabs-mode:nil
528 fill-column:99
529 End:
530 */
531 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :