1 #define __SP_DROPPER_CONTEXT_C__
3 /*
4 * Tool for picking colors from drawing
5 *
6 * Authors:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * bulia byak <buliabyak@users.sf.net>
9 *
10 * Copyright (C) 1999-2005 Authors
11 *
12 * Released under GNU GPL, read the file 'COPYING' for more information
13 */
15 #ifdef HAVE_CONFIG_H
16 # include <config.h>
17 #endif
19 #include <glibmm/i18n.h>
20 #include <glibmm/ustring.h>
21 #include <glibmm/refptr.h>
22 #include <gtkmm/clipboard.h>
23 #include <gdk/gdkkeysyms.h>
25 #include "libnr/n-art-bpath.h"
26 #include "macros.h"
27 #include "display/canvas-bpath.h"
28 #include "display/canvas-arena.h"
29 #include "display/curve.h"
30 #include "svg/svg-color.h"
31 #include "color.h"
32 #include "color-rgba.h"
33 #include "desktop-style.h"
34 #include "prefs-utils.h"
35 #include "sp-namedview.h"
36 #include "desktop.h"
37 #include "desktop-handles.h"
38 #include "selection.h"
39 #include "document.h"
41 #include "pixmaps/cursor-dropper.xpm"
43 #include "dropper-context.h"
44 #include "message-context.h"
45 #include "libnr/nr-scale-translate-ops.h"
47 #define C1 0.552
48 static NArtBpath const spdc_circle[] = {
49 { NR_MOVETO, 0, 0, 0, 0, -1, 0 },
50 { NR_CURVETO, -1, C1, -C1, 1, 0, 1 },
51 { NR_CURVETO, C1, 1, 1, C1, 1, 0 },
52 { NR_CURVETO, 1, -C1, C1, -1, 0, -1 },
53 { NR_CURVETO, -C1, -1, -1, -C1, -1, 0 },
54 { NR_END, 0, 0, 0, 0, 0, 0 }
55 };
56 #undef C1
58 static void sp_dropper_context_class_init(SPDropperContextClass *klass);
59 static void sp_dropper_context_init(SPDropperContext *dc);
61 static void sp_dropper_context_setup(SPEventContext *ec);
62 static void sp_dropper_context_finish(SPEventContext *ec);
64 static gint sp_dropper_context_root_handler(SPEventContext *ec, GdkEvent * event);
66 static SPEventContextClass *parent_class;
68 GType sp_dropper_context_get_type()
69 {
70 static GType type = 0;
71 if (!type) {
72 GTypeInfo info = {
73 sizeof(SPDropperContextClass),
74 NULL, NULL,
75 (GClassInitFunc) sp_dropper_context_class_init,
76 NULL, NULL,
77 sizeof(SPDropperContext),
78 4,
79 (GInstanceInitFunc) sp_dropper_context_init,
80 NULL, /* value_table */
81 };
82 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDropperContext", &info, (GTypeFlags) 0);
83 }
84 return type;
85 }
87 static void sp_dropper_context_class_init(SPDropperContextClass *klass)
88 {
89 SPEventContextClass *ec_class = (SPEventContextClass *) klass;
91 parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
93 ec_class->setup = sp_dropper_context_setup;
94 ec_class->finish = sp_dropper_context_finish;
95 ec_class->root_handler = sp_dropper_context_root_handler;
96 }
98 static void sp_dropper_context_init(SPDropperContext *dc)
99 {
100 SPEventContext *event_context = SP_EVENT_CONTEXT(dc);
101 event_context->cursor_shape = cursor_dropper_xpm;
102 event_context->hot_x = 7;
103 event_context->hot_y = 7;
104 }
106 static void sp_dropper_context_setup(SPEventContext *ec)
107 {
108 SPDropperContext *dc = SP_DROPPER_CONTEXT(ec);
110 if (((SPEventContextClass *) parent_class)->setup) {
111 ((SPEventContextClass *) parent_class)->setup(ec);
112 }
114 SPCurve *c = SPCurve::new_from_foreign_bpath(spdc_circle);
115 dc->area = sp_canvas_bpath_new(sp_desktop_controls(ec->desktop), c);
116 c->unref();
117 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(dc->area), 0x00000000,(SPWindRule)0);
118 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->area), 0x0000007f, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
119 sp_canvas_item_hide(dc->area);
121 if (prefs_get_int_attribute("tools.dropper", "selcue", 0) != 0) {
122 ec->enableSelectionCue();
123 }
125 if (prefs_get_int_attribute("tools.dropper", "gradientdrag", 0) != 0) {
126 ec->enableGrDrag();
127 }
128 }
130 static void sp_dropper_context_finish(SPEventContext *ec)
131 {
132 SPDropperContext *dc = SP_DROPPER_CONTEXT(ec);
134 ec->enableGrDrag(false);
136 if (dc->area) {
137 gtk_object_destroy(GTK_OBJECT(dc->area));
138 dc->area = NULL;
139 }
140 }
143 /**
144 * Returns the current dropper context color.
145 */
146 guint32 sp_dropper_context_get_color(SPEventContext *ec)
147 {
148 SPDropperContext *dc = SP_DROPPER_CONTEXT(ec);
150 int pick = prefs_get_int_attribute("tools.dropper", "pick",
151 SP_DROPPER_PICK_VISIBLE);
152 int setalpha = prefs_get_int_attribute("tools.dropper", "setalpha", 1);
154 return SP_RGBA32_F_COMPOSE(dc->R, dc->G, dc->B,
155 (pick == SP_DROPPER_PICK_ACTUAL && setalpha) ? dc->alpha : 1.0);
156 }
159 static gint sp_dropper_context_root_handler(SPEventContext *event_context, GdkEvent *event)
160 {
161 SPDropperContext *dc = (SPDropperContext *) event_context;
162 int ret = FALSE;
163 SPDesktop *desktop = event_context->desktop;
165 int pick = prefs_get_int_attribute("tools.dropper", "pick", SP_DROPPER_PICK_VISIBLE);
166 int setalpha = prefs_get_int_attribute("tools.dropper", "setalpha", 1);
168 switch (event->type) {
169 case GDK_BUTTON_PRESS:
170 if (event->button.button == 1 && !event_context->space_panning) {
171 dc->centre = NR::Point(event->button.x, event->button.y);
172 dc->dragging = TRUE;
173 ret = TRUE;
174 }
175 break;
176 case GDK_MOTION_NOTIFY:
177 if (event->motion.state & GDK_BUTTON2_MASK) {
178 // pass on middle-drag
179 ret = FALSE;
180 break;
181 } else if (!event_context->space_panning) {
182 // otherwise, constantly calculate color no matter is any button pressed or not
184 double rw = 0.0;
185 double W(0), R(0), G(0), B(0), A(0);
187 if (dc->dragging) {
188 // calculate average
190 // radius
191 rw = std::min(NR::L2(NR::Point(event->button.x, event->button.y) - dc->centre), 400.0);
193 if (rw == 0) { // happens sometimes, little idea why...
194 break;
195 }
197 NR::Point const cd = desktop->w2d(dc->centre);
198 NR::Matrix const w2dt = desktop->w2d();
199 const double scale = rw * NR::expansion(w2dt);
200 NR::Matrix const sm( NR::scale(scale, scale) * NR::translate(cd) );
201 sp_canvas_item_affine_absolute(dc->area, sm);
202 sp_canvas_item_show(dc->area);
204 /* Get buffer */
205 const int x0 = (int) floor(dc->centre[NR::X] - rw);
206 const int y0 = (int) floor(dc->centre[NR::Y] - rw);
207 const int x1 = (int) ceil(dc->centre[NR::X] + rw);
208 const int y1 = (int) ceil(dc->centre[NR::Y] + rw);
210 if ((x1 > x0) && (y1 > y0)) {
211 NRPixBlock pb;
212 nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x0, y0, x1, y1, TRUE);
213 /* fixme: (Lauris) */
214 sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(desktop)), &pb);
215 for (int y = y0; y < y1; y++) {
216 const unsigned char *s = NR_PIXBLOCK_PX(&pb) + (y - y0) * pb.rs;
217 for (int x = x0; x < x1; x++) {
218 const double dx = x - dc->centre[NR::X];
219 const double dy = y - dc->centre[NR::Y];
220 const double w = exp(-((dx * dx) + (dy * dy)) / (rw * rw));
221 W += w;
222 R += w * s[0];
223 G += w * s[1];
224 B += w * s[2];
225 A += w * s[3];
226 s += 4;
227 }
228 }
229 nr_pixblock_release(&pb);
231 R = (R + 0.001) / (255.0 * W);
232 G = (G + 0.001) / (255.0 * W);
233 B = (B + 0.001) / (255.0 * W);
234 A = (A + 0.001) / (255.0 * W);
236 R = CLAMP(R, 0.0, 1.0);
237 G = CLAMP(G, 0.0, 1.0);
238 B = CLAMP(B, 0.0, 1.0);
239 A = CLAMP(A, 0.0, 1.0);
240 }
242 } else {
243 // pick single pixel
244 NRPixBlock pb;
245 int x = (int) floor(event->button.x);
246 int y = (int) floor(event->button.y);
247 nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x, y, x+1, y+1, TRUE);
248 sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(desktop)), &pb);
249 const unsigned char *s = NR_PIXBLOCK_PX(&pb);
251 R = s[0] / 255.0;
252 G = s[1] / 255.0;
253 B = s[2] / 255.0;
254 A = s[3] / 255.0;
255 }
257 if (pick == SP_DROPPER_PICK_VISIBLE) {
258 // compose with page color
259 guint32 bg = sp_desktop_namedview(desktop)->pagecolor;
260 R = R + (SP_RGBA32_R_F(bg)) * (1 - A);
261 G = G + (SP_RGBA32_G_F(bg)) * (1 - A);
262 B = B + (SP_RGBA32_B_F(bg)) * (1 - A);
263 A = 1.0;
264 } else {
265 // un-premultiply color channels
266 if (A > 0) {
267 R /= A;
268 G /= A;
269 B /= A;
270 }
271 }
273 if (fabs(A) < 1e-4) {
274 A = 0; // suppress exponentials, CSS does not allow that
275 }
277 // remember color
278 dc->R = R;
279 dc->G = G;
280 dc->B = B;
281 dc->alpha = A;
283 // status message
284 double alpha_to_set = setalpha? dc->alpha : 1.0;
285 guint32 c32 = SP_RGBA32_F_COMPOSE(R, G, B, alpha_to_set);
287 gchar c[64];
288 sp_svg_write_color(c, sizeof(c), c32);
290 // alpha of color under cursor, to show in the statusbar
291 // locale-sensitive printf is OK, since this goes to the UI, not into SVG
292 gchar *alpha = g_strdup_printf(_(" alpha %.3g"), alpha_to_set);
293 // where the color is picked, to show in the statusbar
294 gchar *where = dc->dragging ? g_strdup_printf(_(", averaged with radius %d"), (int) rw) : g_strdup_printf(_(" under cursor"));
295 // message, to show in the statusbar
296 const gchar *message = dc->dragging ? _("<b>Release mouse</b> to set color.") : _("<b>Click</b> to set fill, <b>Shift+click</b> to set stroke; <b>drag</b> to average color in area; with <b>Alt</b> to pick inverse color; <b>Ctrl+C</b> to copy the color under mouse to clipboard");
297 event_context->defaultMessageContext()->setF(
298 Inkscape::NORMAL_MESSAGE,
299 "<b>%s%s</b>%s. %s", c,
300 (pick == SP_DROPPER_PICK_VISIBLE)? "" : alpha,
301 where, message
302 );
304 g_free(where);
305 g_free(alpha);
307 ret = TRUE;
308 }
309 break;
310 case GDK_BUTTON_RELEASE:
311 if (event->button.button == 1 && !event_context->space_panning)
312 {
313 sp_canvas_item_hide(dc->area);
314 dc->dragging = FALSE;
316 double alpha_to_set = setalpha? dc->alpha : 1.0;
318 // do the actual color setting
319 sp_desktop_set_color(desktop,
320 (event->button.state & GDK_MOD1_MASK)?
321 ColorRGBA(1 - dc->R, 1 - dc->G, 1 - dc->B, alpha_to_set) : ColorRGBA(dc->R, dc->G, dc->B, alpha_to_set),
322 false, !(event->button.state & GDK_SHIFT_MASK));
324 // REJON: set aux. toolbar input to hex color!
327 if (!(sp_desktop_selection(desktop)->isEmpty())) {
328 sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_DROPPER,
329 _("Set picked color"));
330 }
332 ret = TRUE;
333 }
334 break;
335 case GDK_KEY_PRESS:
336 switch (get_group0_keyval(&event->key)) {
337 case GDK_Up:
338 case GDK_Down:
339 case GDK_KP_Up:
340 case GDK_KP_Down:
341 // prevent the zoom field from activation
342 if (!MOD__CTRL_ONLY) {
343 ret = TRUE;
344 }
345 break;
346 case GDK_Escape:
347 sp_desktop_selection(desktop)->clear();
348 default:
349 break;
350 }
351 break;
352 default:
353 break;
354 }
356 if (!ret) {
357 if (((SPEventContextClass *) parent_class)->root_handler) {
358 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
359 }
360 }
362 return ret;
363 }
366 /*
367 Local Variables:
368 mode:c++
369 c-file-style:"stroustrup"
370 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
371 indent-tabs-mode:nil
372 fill-column:99
373 End:
374 */
375 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :