1 #define __SP_DASH_SELECTOR_C__
3 /*
4 * Optionmenu for selecting dash patterns
5 *
6 * Author:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * bulia byak <buliabyak@users.sf.net>
9 *
10 * Copyright (C) 2002 Lauris Kaplinski
11 *
12 * Released under GNU GPL, read the file 'COPYING' for more information
13 */
15 #define DASH_PREVIEW_WIDTH 2
16 #define DASH_PREVIEW_LENGTH 80
18 #ifdef HAVE_CONFIG_H
19 # include "config.h"
20 #endif
22 #include <cstring>
23 #include <string>
24 #include <libnr/nr-macros.h>
25 #include <gtk/gtk.h>
26 #include <glibmm/i18n.h>
28 #include "../style.h"
29 #include "../dialogs/dialog-events.h"
31 #include "dash-selector.h"
33 enum {CHANGED, LAST_SIGNAL};
35 struct SPDashSelector {
36 GtkHBox hbox;
38 GtkWidget *dash;
39 GtkObject *offset;
40 };
42 struct SPDashSelectorClass {
43 GtkHBoxClass parent_class;
45 void (* changed) (SPDashSelector *dsel);
46 };
48 double dash_0[] = {-1.0};
49 double dash_1_1[] = {1.0, 1.0, -1.0};
50 double dash_2_1[] = {2.0, 1.0, -1.0};
51 double dash_4_1[] = {4.0, 1.0, -1.0};
52 double dash_1_2[] = {1.0, 2.0, -1.0};
53 double dash_1_4[] = {1.0, 4.0, -1.0};
55 double *builtin_dashes[] = {dash_0, dash_1_1, dash_2_1, dash_4_1, dash_1_2, dash_1_4, NULL};
57 static double **dashes = NULL;
59 static void sp_dash_selector_class_init (SPDashSelectorClass *klass);
60 static void sp_dash_selector_init (SPDashSelector *dsel);
61 static GtkWidget *sp_dash_selector_menu_item_new (SPDashSelector *dsel, double *pattern);
62 static void sp_dash_selector_menu_item_image_realize (GtkWidget *mi, double *pattern);
63 static void sp_dash_selector_dash_activate (GtkObject *object, SPDashSelector *dsel);
64 static void sp_dash_selector_offset_value_changed (GtkAdjustment *adj, SPDashSelector *dsel);
66 static GtkHBoxClass *parent_class;
67 static guint signals[LAST_SIGNAL] = {0};
69 GtkType
70 sp_dash_selector_get_type (void)
71 {
72 static GtkType type = 0;
73 if (!type) {
74 GtkTypeInfo info = {
75 "SPDashSelector",
76 sizeof (SPDashSelector),
77 sizeof (SPDashSelectorClass),
78 (GtkClassInitFunc) sp_dash_selector_class_init,
79 (GtkObjectInitFunc) sp_dash_selector_init,
80 NULL, NULL, NULL
81 };
82 type = gtk_type_unique (GTK_TYPE_HBOX, &info);
83 }
84 return type;
85 }
87 static void
88 sp_dash_selector_class_init (SPDashSelectorClass *klass)
89 {
90 parent_class = (GtkHBoxClass*)gtk_type_class (GTK_TYPE_HBOX);
92 signals[CHANGED] = gtk_signal_new ("changed",
93 (GtkSignalRunType)(GTK_RUN_FIRST | GTK_RUN_NO_RECURSE),
94 G_TYPE_FROM_CLASS (klass),
95 GTK_SIGNAL_OFFSET (SPDashSelectorClass, changed),
96 gtk_marshal_NONE__NONE,
97 GTK_TYPE_NONE, 0);
98 }
100 static void
101 sp_dash_selector_init (SPDashSelector *dsel)
102 {
103 GtkTooltips *tt = gtk_tooltips_new();
105 dsel->dash = gtk_option_menu_new ();
106 gtk_tooltips_set_tip (tt, dsel->dash, _("Dash pattern"), NULL);
107 gtk_widget_show (dsel->dash);
108 gtk_box_pack_start (GTK_BOX (dsel), dsel->dash, FALSE, FALSE, 0);
110 GtkWidget *m = gtk_menu_new ();
111 gtk_widget_show (m);
112 for (int i = 0; dashes[i]; i++) {
113 GtkWidget *mi = sp_dash_selector_menu_item_new (dsel, dashes[i]);
114 gtk_widget_show (mi);
115 gtk_menu_append (GTK_MENU (m), mi);
116 }
117 gtk_option_menu_set_menu (GTK_OPTION_MENU (dsel->dash), m);
119 dsel->offset = gtk_adjustment_new (0.0, 0.0, 10.0, 0.1, 1.0, 1.0);
120 GtkWidget *sb = gtk_spin_button_new (GTK_ADJUSTMENT (dsel->offset), 0.1, 2);
121 gtk_tooltips_set_tip (tt, sb, _("Pattern offset"), NULL);
123 sp_dialog_defocus_on_enter (sb);
124 gtk_widget_show (sb);
125 gtk_box_pack_start (GTK_BOX (dsel), sb, FALSE, FALSE, 0);
126 gtk_signal_connect (dsel->offset, "value_changed", GTK_SIGNAL_FUNC (sp_dash_selector_offset_value_changed), dsel);
128 gtk_object_set_data (GTK_OBJECT (dsel), "pattern", dashes[0]);
129 }
131 GtkWidget *
132 sp_dash_selector_new (Inkscape::XML::Node *drepr)
133 {
134 if (!dashes) {
135 int ndashes = 0;
136 if (drepr) {
137 for (Inkscape::XML::Node *dr = drepr->firstChild(); dr; dr = dr->next()) {
138 if (!strcmp (dr->name(), "dash"))
139 ndashes += 1;
140 }
141 }
143 if (ndashes > 0) {
144 int pos = 0;
145 SPStyle *style = sp_style_new (NULL);
146 dashes = g_new (double *, ndashes + 1);
147 for (Inkscape::XML::Node *dr = drepr->firstChild(); dr; dr = dr->next()) {
148 if (!strcmp (dr->name(), "dash")) {
149 sp_style_read_from_repr (style, dr);
150 if (style->stroke_dash.n_dash > 0) {
151 dashes[pos] = g_new (double, style->stroke_dash.n_dash + 1);
152 double *d = dashes[pos];
153 int i = 0;
154 for (; i < style->stroke_dash.n_dash; i++) {
155 d[i] = style->stroke_dash.dash[i];
156 }
157 d[i] = -1;
158 } else {
159 dashes[pos] = dash_0;
160 }
161 pos += 1;
162 }
163 }
164 sp_style_unref (style);
165 dashes[pos] = NULL;
166 } else {
167 dashes = builtin_dashes;
168 }
169 }
171 GtkWidget *dsel = (GtkWidget*)gtk_type_new (SP_TYPE_DASH_SELECTOR);
173 return dsel;
174 }
176 void
177 sp_dash_selector_set_dash (SPDashSelector *dsel, int ndash, double *dash, double offset)
178 {
179 int pos = 0;
180 if (ndash > 0) {
181 double delta = 0.0;
182 for (int i = 0; i < ndash; i++)
183 delta += dash[i];
184 delta /= 1000.0;
186 for (int i = 0; dashes[i]; i++) {
187 double *pattern = dashes[i];
188 int np = 0;
189 while (pattern[np] >= 0.0)
190 np += 1;
191 if (np == ndash) {
192 int j;
193 for (j = 0; j < ndash; j++) {
194 if (!NR_DF_TEST_CLOSE (dash[j], pattern[j], delta))
195 break;
196 }
197 if (j == ndash) {
198 pos = i;
199 break;
200 }
201 }
202 }
203 }
205 gtk_object_set_data (GTK_OBJECT (dsel), "pattern", dashes[pos]);
206 gtk_option_menu_set_history (GTK_OPTION_MENU (dsel->dash), pos);
207 gtk_adjustment_set_value (GTK_ADJUSTMENT (dsel->offset), offset);
208 }
210 void
211 sp_dash_selector_get_dash (SPDashSelector *dsel, int *ndash, double **dash, double *offset)
212 {
213 double *pattern = (double*)gtk_object_get_data (GTK_OBJECT (dsel), "pattern");
215 int nd = 0;
216 while (pattern[nd] >= 0.0)
217 nd += 1;
219 if (nd > 0) {
220 if (ndash)
221 *ndash = nd;
222 if (dash) {
223 *dash = g_new (double, nd);
224 memcpy (*dash, pattern, nd * sizeof (double));
225 }
226 if (offset)
227 *offset = GTK_ADJUSTMENT (dsel->offset)->value;
228 } else {
229 if (ndash)
230 *ndash = 0;
231 if (dash)
232 *dash = NULL;
233 if (offset)
234 *offset = 0.0;
235 }
236 }
238 bool
239 all_even_are_zero (double *pattern, int n)
240 {
241 for (int i = 0; i < n; i += 2) {
242 if (pattern[i] != 0)
243 return false;
244 }
245 return true;
246 }
248 bool
249 all_odd_are_zero (double *pattern, int n)
250 {
251 for (int i = 1; i < n; i += 2) {
252 if (pattern[i] != 0)
253 return false;
254 }
255 return true;
256 }
258 static GtkWidget *
259 sp_dash_selector_menu_item_new (SPDashSelector *dsel, double *pattern)
260 {
261 GtkWidget *mi = gtk_menu_item_new ();
262 GtkWidget *px = gtk_image_new_from_pixmap (NULL, NULL);
264 gtk_widget_show (px);
265 gtk_container_add (GTK_CONTAINER (mi), px);
267 gtk_object_set_data (GTK_OBJECT (mi), "pattern", pattern);
268 gtk_object_set_data (GTK_OBJECT (mi), "px", px);
269 gtk_signal_connect (GTK_OBJECT (mi), "activate", G_CALLBACK (sp_dash_selector_dash_activate), dsel);
271 g_signal_connect_after(G_OBJECT(px), "realize", G_CALLBACK(sp_dash_selector_menu_item_image_realize), pattern);
273 return mi;
274 }
276 static void sp_dash_selector_menu_item_image_realize (GtkWidget *px, double *pattern) {
277 GdkPixmap *pixmap = gdk_pixmap_new(px->window, DASH_PREVIEW_LENGTH + 4, 16, -1);
278 GdkGC *gc = gdk_gc_new (pixmap);
280 gdk_rgb_gc_set_foreground (gc, 0xffffffff);
281 gdk_draw_rectangle (pixmap, gc, TRUE, 0, 0, DASH_PREVIEW_LENGTH + 4, 16);
283 // FIXME: all of the below twibblering is due to the limitations of gdk_gc_set_dashes (only integers, no zeroes).
284 // Perhaps would make sense to rework this with manually drawn dashes.
286 // Fill in the integer array of pixel-lengths, for display
287 gint8 pixels_i[64];
288 gdouble pixels_d[64];
289 int n_source_dashes = 0;
290 int n_pixel_dashes = 0;
292 signed int i_s, i_p;
293 for (i_s = 0, i_p = 0; pattern[i_s] >= 0.0; i_s ++, i_p ++) {
294 pixels_d[i_p] = 0.0;
295 }
297 n_source_dashes = i_s;
299 for (i_s = 0, i_p = 0; i_s < n_source_dashes; i_s ++, i_p ++) {
301 // calculate the pixel length corresponding to the current dash
302 gdouble pixels = DASH_PREVIEW_WIDTH * pattern[i_s];
304 if (pixels > 0.0)
305 pixels_d [i_p] += pixels;
306 else {
307 if (i_p >= 1) {
308 // dash is zero, skip this element in the array, and set pointer backwards so the next dash is added to the previous
309 i_p -= 2;
310 } else {
311 // the first dash is zero; bad luck, gdk cannot start pattern with non-stroke, so we put a 1-pixel stub here
312 // (it may turn out not shown, though, see special cases below)
313 pixels_d [i_p] = 1.0;
314 }
315 }
316 }
318 n_pixel_dashes = i_p;
320 gdouble longest_dash = 0.0;
322 // after summation, convert double dash lengths to ints
323 for (i_p = 0; i_p < n_pixel_dashes; i_p ++) {
324 pixels_i [i_p] = (gint8) (pixels_d [i_p] + 0.5);
325 // zero-length dashes are already eliminated, so the <1 dash is short but not zero;
326 // we approximate it with a one-pixel mark
327 if (pixels_i [i_p] < 1)
328 pixels_i [i_p] = 1;
329 if (i_p % 2 == 0) { // it's a dash
330 if (pixels_d [i_p] > longest_dash)
331 longest_dash = pixels_d [i_p];
332 }
333 }
335 if (longest_dash > 1e-18 && longest_dash < 0.5) {
336 // fake "shortening" of one-pixel marks by painting them lighter-than-black
337 gint rgb = 255 - (gint) (255 * longest_dash / 0.5);
338 gdk_rgb_gc_set_foreground (gc, SP_RGBA32_U_COMPOSE (rgb, rgb, rgb, rgb));
339 } else {
340 gdk_rgb_gc_set_foreground (gc, 0x00000000);
341 }
343 if (n_source_dashes > 0) {
344 // special cases:
345 if (all_even_are_zero (pattern, n_source_dashes)) {
346 ; // do not draw anything, only gaps are non-zero
347 } else if (all_odd_are_zero (pattern, n_source_dashes)) {
348 // draw solid line, only dashes are non-zero
349 gdk_gc_set_line_attributes (gc, DASH_PREVIEW_WIDTH,
350 GDK_LINE_SOLID, GDK_CAP_BUTT,
351 GDK_JOIN_MITER);
352 gdk_draw_line (pixmap, gc, 4, 8, DASH_PREVIEW_LENGTH, 8);
353 } else {
354 // regular pattern with both gaps and dashes non-zero
355 gdk_gc_set_line_attributes (gc, DASH_PREVIEW_WIDTH,
356 GDK_LINE_ON_OFF_DASH, GDK_CAP_BUTT,
357 GDK_JOIN_MITER);
358 gdk_gc_set_dashes (gc, 0, pixels_i, n_pixel_dashes);
359 gdk_draw_line (pixmap, gc, 4, 8, DASH_PREVIEW_LENGTH, 8);
360 }
361 } else {
362 // no pattern, draw solid line
363 gdk_gc_set_line_attributes (gc, DASH_PREVIEW_WIDTH,
364 GDK_LINE_SOLID, GDK_CAP_BUTT,
365 GDK_JOIN_MITER);
366 gdk_draw_line (pixmap, gc, 4, 8, DASH_PREVIEW_LENGTH, 8);
367 }
369 gdk_gc_unref (gc);
371 gtk_image_set_from_pixmap(GTK_IMAGE(px), pixmap, NULL);
372 gdk_pixmap_unref(pixmap);
373 }
375 static void
376 sp_dash_selector_dash_activate (GtkObject *object, SPDashSelector *dsel)
377 {
378 double *pattern = (double*)gtk_object_get_data (object, "pattern");
379 gtk_object_set_data (GTK_OBJECT (dsel), "pattern", pattern);
381 gtk_signal_emit (GTK_OBJECT (dsel), signals[CHANGED]);
382 }
384 static void
385 sp_dash_selector_offset_value_changed (GtkAdjustment *adj, SPDashSelector *dsel)
386 {
387 gtk_signal_emit (GTK_OBJECT (dsel), signals[CHANGED]);
388 }