1 #define __SP_CANVASTEXT_C__
3 /*
4 * Canvas text
5 *
6 * Authors:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * Maximilian Albert <maximilian.albert@gmail.com>
9 *
10 * Copyright (C) 2000-2002 Lauris Kaplinski
11 * Copyright (C) 2008 Maximilian Albert
12 *
13 * Released under GNU GPL, read the file 'COPYING' for more information
14 */
16 #include "sp-canvas-util.h"
17 #include "canvas-text.h"
18 #include "display/inkscape-cairo.h"
19 #include <sstream>
20 #include <string.h>
21 #include "desktop.h"
23 #ifdef HAVE_CONFIG_H
24 # include "config.h"
25 #endif
26 #include <color.h>
28 #include <libnr/nr-pixops.h>
30 static void sp_canvastext_class_init (SPCanvasTextClass *klass);
31 static void sp_canvastext_init (SPCanvasText *canvastext);
32 static void sp_canvastext_destroy (GtkObject *object);
34 static void sp_canvastext_update (SPCanvasItem *item, Geom::Matrix const &affine, unsigned int flags);
35 static void sp_canvastext_render (SPCanvasItem *item, SPCanvasBuf *buf);
37 static SPCanvasItemClass *parent_class_ct;
39 GtkType
40 sp_canvastext_get_type (void)
41 {
42 static GtkType type = 0;
44 if (!type) {
45 GtkTypeInfo info = {
46 (gchar *)"SPCanvasText",
47 sizeof (SPCanvasText),
48 sizeof (SPCanvasTextClass),
49 (GtkClassInitFunc) sp_canvastext_class_init,
50 (GtkObjectInitFunc) sp_canvastext_init,
51 NULL, NULL, NULL
52 };
53 type = gtk_type_unique (SP_TYPE_CANVAS_ITEM, &info);
54 }
55 return type;
56 }
58 static void
59 sp_canvastext_class_init (SPCanvasTextClass *klass)
60 {
61 GtkObjectClass *object_class = (GtkObjectClass *) klass;
62 SPCanvasItemClass *item_class = (SPCanvasItemClass *) klass;
64 parent_class_ct = (SPCanvasItemClass*)gtk_type_class (SP_TYPE_CANVAS_ITEM);
66 object_class->destroy = sp_canvastext_destroy;
68 item_class->update = sp_canvastext_update;
69 item_class->render = sp_canvastext_render;
70 }
72 static void
73 sp_canvastext_init (SPCanvasText *canvastext)
74 {
75 canvastext->rgba = 0x33337fff;
76 canvastext->rgba_stroke = 0xffffffff;
77 canvastext->s[Geom::X] = canvastext->s[Geom::Y] = 0.0;
78 canvastext->affine = Geom::identity();
79 canvastext->fontsize = 10.0;
80 canvastext->item = NULL;
81 canvastext->desktop = NULL;
82 canvastext->text = NULL;
83 }
85 static void
86 sp_canvastext_destroy (GtkObject *object)
87 {
88 g_return_if_fail (object != NULL);
89 g_return_if_fail (SP_IS_CANVASTEXT (object));
91 SPCanvasText *canvastext = SP_CANVASTEXT (object);
93 g_free(canvastext->text);
94 canvastext->text = NULL;
95 canvastext->item = NULL;
97 if (GTK_OBJECT_CLASS (parent_class_ct)->destroy)
98 (* GTK_OBJECT_CLASS (parent_class_ct)->destroy) (object);
99 }
101 // FIXME: remove this as soon as we know how to correctly determine the text extent
102 static const double arbitrary_factor = 0.8;
104 // these are set in sp_canvastext_update() and then re-used in sp_canvastext_render(), which is called afterwards
105 static double anchor_offset_x = 0;
106 static double anchor_offset_y = 0;
108 static void
109 sp_canvastext_render (SPCanvasItem *item, SPCanvasBuf *buf)
110 {
111 SPCanvasText *cl = SP_CANVASTEXT (item);
113 if (!buf->ct)
114 return;
116 Geom::Point s = cl->s * cl->affine;
117 double offsetx = s[Geom::X] - buf->rect.x0;
118 double offsety = s[Geom::Y] - buf->rect.y0;
119 offsetx -= anchor_offset_x;
120 offsety += anchor_offset_y;
122 cairo_move_to(buf->ct, offsetx, offsety);
123 cairo_set_font_size(buf->ct, cl->fontsize);
124 cairo_text_path(buf->ct, cl->text);
126 cairo_set_source_rgba(buf->ct, SP_RGBA32_B_F(cl->rgba_stroke), SP_RGBA32_G_F(cl->rgba_stroke), SP_RGBA32_R_F(cl->rgba_stroke), SP_RGBA32_A_F(cl->rgba_stroke));
127 cairo_set_line_width (buf->ct, 2.0);
128 cairo_stroke_preserve(buf->ct);
129 cairo_set_source_rgba(buf->ct, SP_RGBA32_B_F(cl->rgba), SP_RGBA32_G_F(cl->rgba), SP_RGBA32_R_F(cl->rgba), SP_RGBA32_A_F(cl->rgba));
130 cairo_fill(buf->ct);
132 cairo_new_path(buf->ct);
133 }
135 static void
136 sp_canvastext_update (SPCanvasItem *item, Geom::Matrix const &affine, unsigned int flags)
137 {
138 SPCanvasText *cl = SP_CANVASTEXT (item);
140 sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
142 if (parent_class_ct->update)
143 (* parent_class_ct->update) (item, affine, flags);
145 sp_canvas_item_reset_bounds (item);
147 cl->affine = affine;
149 Geom::Point s = cl->s * affine;
151 // set up a temporary cairo_t to measure the text extents; it would be better to compute this in the render()
152 // method but update() seems to be called before so we don't have the information available when we need it
153 /**
154 cairo_t tmp_buf;
155 cairo_text_extents_t bbox;
156 cairo_text_extents(&tmp_buf, cl->text, &bbox);
157 **/
158 item->x1 = s[Geom::X] + 0;
159 item->y1 = s[Geom::Y] - cl->fontsize;
160 item->x2 = s[Geom::X] + cl->fontsize * strlen(cl->text);
161 item->y2 = s[Geom::Y] + cl->fontsize * 0.5; // for letters below the baseline
163 // adjust update region according to anchor shift
164 // FIXME: use the correct text extent
165 anchor_offset_x = arbitrary_factor * cl->fontsize * strlen(cl->text) * (cl->anchor_x + 1.0) / 2.0;
166 anchor_offset_y = cl->fontsize * (cl->anchor_y + 1.0) / 2.0;
167 item->x1 -= anchor_offset_x;
168 item->x2 -= anchor_offset_x;
169 item->y1 += anchor_offset_y;
170 item->y2 += anchor_offset_y;
172 sp_canvas_request_redraw (item->canvas, (int)item->x1, (int)item->y1, (int)item->x2, (int)item->y2);
173 }
175 SPCanvasItem *
176 sp_canvastext_new(SPCanvasGroup *parent, SPDesktop *desktop, Geom::Point pos, gchar const *new_text)
177 {
178 SPCanvasItem *item = sp_canvas_item_new(parent, SP_TYPE_CANVASTEXT, NULL);
180 SPCanvasText *ct = SP_CANVASTEXT(item);
182 ct->desktop = desktop;
184 ct->s = pos;
185 g_free(ct->text);
186 ct->text = g_strdup(new_text);
188 // TODO: anything else to do?
190 return item;
191 }
194 void
195 sp_canvastext_set_rgba32 (SPCanvasText *ct, guint32 rgba, guint32 rgba_stroke)
196 {
197 g_return_if_fail (ct != NULL);
198 g_return_if_fail (SP_IS_CANVASTEXT (ct));
200 if (rgba != ct->rgba || rgba_stroke != ct->rgba_stroke) {
201 ct->rgba = rgba;
202 ct->rgba_stroke = rgba_stroke;
203 SPCanvasItem *item = SP_CANVAS_ITEM (ct);
204 sp_canvas_item_request_update( item );
205 }
206 }
208 #define EPSILON 1e-6
209 #define DIFFER(a,b) (fabs ((a) - (b)) > EPSILON)
211 void
212 sp_canvastext_set_coords (SPCanvasText *ct, gdouble x0, gdouble y0)
213 {
214 sp_canvastext_set_coords(ct, Geom::Point(x0, y0));
215 }
217 void
218 sp_canvastext_set_coords (SPCanvasText *ct, const Geom::Point start)
219 {
220 Geom::Point pos = ct->desktop->doc2dt(start);
222 g_return_if_fail (ct != NULL);
223 g_return_if_fail (SP_IS_CANVASTEXT (ct));
225 if (DIFFER (pos[0], ct->s[Geom::X]) || DIFFER (pos[1], ct->s[Geom::Y])) {
226 ct->s[Geom::X] = pos[0];
227 ct->s[Geom::Y] = pos[1];
228 sp_canvas_item_request_update (SP_CANVAS_ITEM (ct));
229 }
230 }
232 void
233 sp_canvastext_set_text (SPCanvasText *ct, gchar const * new_text)
234 {
235 g_free (ct->text);
236 ct->text = g_strdup(new_text);
237 sp_canvas_item_request_update (SP_CANVAS_ITEM (ct));
238 }
240 void
241 sp_canvastext_set_number_as_text (SPCanvasText *ct, int num)
242 {
243 std::ostringstream number;
244 number << num;
245 sp_canvastext_set_text(ct, number.str().c_str());
246 }
248 void
249 sp_canvastext_set_fontsize (SPCanvasText *ct, double size)
250 {
251 ct->fontsize = size;
252 }
254 void
255 sp_canvastext_set_anchor (SPCanvasText *ct, double anchor_x, double anchor_y)
256 {
257 ct->anchor_x = anchor_x;
258 ct->anchor_y = anchor_y;
259 }
262 /*
263 Local Variables:
264 mode:c++
265 c-file-style:"stroustrup"
266 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
267 indent-tabs-mode:nil
268 fill-column:99
269 End:
270 */
271 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :