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
21 #include <libnr/nr-macros.h>
22 #include <gtk/gtk.h>
24 #include <glibmm/i18n.h>
25 #include "../style.h"
26 #include "../dialogs/dialog-events.h"
28 #include "dash-selector.h"
30 enum {CHANGED, LAST_SIGNAL};
32 struct SPDashSelector {
33 GtkHBox hbox;
35 GtkWidget *dash;
36 GtkObject *offset;
37 };
39 struct SPDashSelectorClass {
40 GtkHBoxClass parent_class;
42 void (* changed) (SPDashSelector *dsel);
43 };
45 double dash_0[] = {-1.0};
46 double dash_1_1[] = {1.0, 1.0, -1.0};
47 double dash_2_1[] = {2.0, 1.0, -1.0};
48 double dash_4_1[] = {4.0, 1.0, -1.0};
49 double dash_1_2[] = {1.0, 2.0, -1.0};
50 double dash_1_4[] = {1.0, 4.0, -1.0};
52 double *builtin_dashes[] = {dash_0, dash_1_1, dash_2_1, dash_4_1, dash_1_2, dash_1_4, NULL};
54 static double **dashes = NULL;
56 static void sp_dash_selector_class_init (SPDashSelectorClass *klass);
57 static void sp_dash_selector_init (SPDashSelector *dsel);
58 static GtkWidget *sp_dash_selector_menu_item_new (SPDashSelector *dsel, double *pattern);
59 static void sp_dash_selector_dash_activate (GtkObject *object, SPDashSelector *dsel);
60 static void sp_dash_selector_offset_value_changed (GtkAdjustment *adj, SPDashSelector *dsel);
62 static GtkHBoxClass *parent_class;
63 static guint signals[LAST_SIGNAL] = {0};
65 GtkType
66 sp_dash_selector_get_type (void)
67 {
68 static GtkType type = 0;
69 if (!type) {
70 GtkTypeInfo info = {
71 "SPDashSelector",
72 sizeof (SPDashSelector),
73 sizeof (SPDashSelectorClass),
74 (GtkClassInitFunc) sp_dash_selector_class_init,
75 (GtkObjectInitFunc) sp_dash_selector_init,
76 NULL, NULL, NULL
77 };
78 type = gtk_type_unique (GTK_TYPE_HBOX, &info);
79 }
80 return type;
81 }
83 static void
84 sp_dash_selector_class_init (SPDashSelectorClass *klass)
85 {
86 parent_class = (GtkHBoxClass*)gtk_type_class (GTK_TYPE_HBOX);
88 signals[CHANGED] = gtk_signal_new ("changed",
89 (GtkSignalRunType)(GTK_RUN_FIRST | GTK_RUN_NO_RECURSE),
90 G_TYPE_FROM_CLASS (klass),
91 GTK_SIGNAL_OFFSET (SPDashSelectorClass, changed),
92 gtk_marshal_NONE__NONE,
93 GTK_TYPE_NONE, 0);
94 }
96 static void
97 sp_dash_selector_init (SPDashSelector *dsel)
98 {
99 GtkTooltips *tt = gtk_tooltips_new();
101 dsel->dash = gtk_option_menu_new ();
102 gtk_tooltips_set_tip (tt, dsel->dash, _("Dash pattern"), NULL);
103 gtk_widget_show (dsel->dash);
104 gtk_box_pack_start (GTK_BOX (dsel), dsel->dash, FALSE, FALSE, 0);
106 GtkWidget *m = gtk_menu_new ();
107 gtk_widget_show (m);
108 for (int i = 0; dashes[i]; i++) {
109 GtkWidget *mi = sp_dash_selector_menu_item_new (dsel, dashes[i]);
110 gtk_widget_show (mi);
111 gtk_menu_append (GTK_MENU (m), mi);
112 }
113 gtk_option_menu_set_menu (GTK_OPTION_MENU (dsel->dash), m);
115 dsel->offset = gtk_adjustment_new (0.0, 0.0, 10.0, 0.1, 1.0, 1.0);
116 GtkWidget *sb = gtk_spin_button_new (GTK_ADJUSTMENT (dsel->offset), 0.1, 2);
117 gtk_tooltips_set_tip (tt, sb, _("Pattern offset"), NULL);
119 sp_dialog_defocus_on_enter (sb);
120 gtk_widget_show (sb);
121 gtk_box_pack_start (GTK_BOX (dsel), sb, FALSE, FALSE, 0);
122 gtk_signal_connect (dsel->offset, "value_changed", GTK_SIGNAL_FUNC (sp_dash_selector_offset_value_changed), dsel);
124 gtk_object_set_data (GTK_OBJECT (dsel), "pattern", dashes[0]);
125 }
127 GtkWidget *
128 sp_dash_selector_new (Inkscape::XML::Node *drepr)
129 {
130 if (!dashes) {
131 int ndashes = 0;
132 if (drepr) {
133 for (Inkscape::XML::Node *dr = drepr->firstChild(); dr; dr = dr->next()) {
134 if (!strcmp (dr->name(), "dash"))
135 ndashes += 1;
136 }
137 }
139 if (ndashes > 0) {
140 int pos = 0;
141 SPStyle *style = sp_style_new ();
142 dashes = g_new (double *, ndashes + 1);
143 for (Inkscape::XML::Node *dr = drepr->firstChild(); dr; dr = dr->next()) {
144 if (!strcmp (dr->name(), "dash")) {
145 sp_style_read_from_repr (style, dr);
146 if (style->stroke_dash.n_dash > 0) {
147 dashes[pos] = g_new (double, style->stroke_dash.n_dash + 1);
148 double *d = dashes[pos];
149 int i = 0;
150 for (; i < style->stroke_dash.n_dash; i++) {
151 d[i] = style->stroke_dash.dash[i];
152 }
153 d[i] = -1;
154 } else {
155 dashes[pos] = dash_0;
156 }
157 pos += 1;
158 }
159 }
160 sp_style_unref (style);
161 dashes[pos] = NULL;
162 } else {
163 dashes = builtin_dashes;
164 }
165 }
167 GtkWidget *dsel = (GtkWidget*)gtk_type_new (SP_TYPE_DASH_SELECTOR);
169 return dsel;
170 }
172 void
173 sp_dash_selector_set_dash (SPDashSelector *dsel, int ndash, double *dash, double offset)
174 {
175 int pos = 0;
176 if (ndash > 0) {
177 double delta = 0.0;
178 for (int i = 0; i < ndash; i++)
179 delta += dash[i];
180 delta /= 1000.0;
182 for (int i = 0; dashes[i]; i++) {
183 double *pattern = dashes[i];
184 int np = 0;
185 while (pattern[np] >= 0.0)
186 np += 1;
187 if (np == ndash) {
188 int j;
189 for (j = 0; j < ndash; j++) {
190 if (!NR_DF_TEST_CLOSE (dash[j], pattern[j], delta))
191 break;
192 }
193 if (j == ndash) {
194 pos = i;
195 break;
196 }
197 }
198 }
199 }
201 gtk_object_set_data (GTK_OBJECT (dsel), "pattern", dashes[pos]);
202 gtk_option_menu_set_history (GTK_OPTION_MENU (dsel->dash), pos);
203 gtk_adjustment_set_value (GTK_ADJUSTMENT (dsel->offset), offset);
204 }
206 void
207 sp_dash_selector_get_dash (SPDashSelector *dsel, int *ndash, double **dash, double *offset)
208 {
209 double *pattern = (double*)gtk_object_get_data (GTK_OBJECT (dsel), "pattern");
211 int nd = 0;
212 while (pattern[nd] >= 0.0)
213 nd += 1;
215 if (nd > 0) {
216 if (ndash)
217 *ndash = nd;
218 if (dash) {
219 *dash = g_new (double, nd);
220 memcpy (*dash, pattern, nd * sizeof (double));
221 }
222 if (offset)
223 *offset = GTK_ADJUSTMENT (dsel->offset)->value;
224 } else {
225 if (ndash)
226 *ndash = 0;
227 if (dash)
228 *dash = NULL;
229 if (offset)
230 *offset = 0.0;
231 }
232 }
234 bool
235 all_even_are_zero (double *pattern, int n)
236 {
237 for (int i = 0; i < n; i += 2) {
238 if (pattern[i] != 0)
239 return false;
240 }
241 return true;
242 }
244 bool
245 all_odd_are_zero (double *pattern, int n)
246 {
247 for (int i = 1; i < n; i += 2) {
248 if (pattern[i] != 0)
249 return false;
250 }
251 return true;
252 }
254 static GtkWidget *
255 sp_dash_selector_menu_item_new (SPDashSelector *dsel, double *pattern)
256 {
257 GtkWidget *mi = gtk_menu_item_new ();
259 GdkPixmap *pixmap = gdk_pixmap_new (GTK_WIDGET (dsel)->window, DASH_PREVIEW_LENGTH + 4, 16, gdk_visual_get_best_depth ());
260 GdkGC *gc = gdk_gc_new (pixmap);
262 gdk_rgb_gc_set_foreground (gc, 0xffffffff);
263 gdk_draw_rectangle (pixmap, gc, TRUE, 0, 0, DASH_PREVIEW_LENGTH + 4, 16);
265 // FIXME: all of the below twibblering is due to the limitations of gdk_gc_set_dashes (only integers, no zeroes).
266 // Perhaps would make sense to rework this with manually drawn dashes.
268 // Fill in the integer array of pixel-lengths, for display
269 gint8 pixels_i[64];
270 gdouble pixels_d[64];
271 int n_source_dashes = 0;
272 int n_pixel_dashes = 0;
274 signed int i_s, i_p;
275 for (i_s = 0, i_p = 0; pattern[i_s] >= 0.0; i_s ++, i_p ++) {
276 pixels_d[i_p] = 0.0;
277 }
279 n_source_dashes = i_s;
281 for (i_s = 0, i_p = 0; i_s < n_source_dashes; i_s ++, i_p ++) {
283 // calculate the pixel length corresponding to the current dash
284 gdouble pixels = DASH_PREVIEW_WIDTH * pattern[i_s];
286 if (pixels > 0.0)
287 pixels_d [i_p] += pixels;
288 else {
289 if (i_p >= 1) {
290 // dash is zero, skip this element in the array, and set pointer backwards so the next dash is added to the previous
291 i_p -= 2;
292 } else {
293 // the first dash is zero; bad luck, gdk cannot start pattern with non-stroke, so we put a 1-pixel stub here
294 // (it may turn out not shown, though, see special cases below)
295 pixels_d [i_p] = 1.0;
296 }
297 }
298 }
300 n_pixel_dashes = i_p;
302 gdouble longest_dash = 0.0;
304 // after summation, convert double dash lengths to ints
305 for (i_p = 0; i_p < n_pixel_dashes; i_p ++) {
306 pixels_i [i_p] = (gint8) (pixels_d [i_p] + 0.5);
307 // zero-length dashes are already eliminated, so the <1 dash is short but not zero;
308 // we approximate it with a one-pixel mark
309 if (pixels_i [i_p] < 1)
310 pixels_i [i_p] = 1;
311 if (i_p % 2 == 0) { // it's a dash
312 if (pixels_d [i_p] > longest_dash)
313 longest_dash = pixels_d [i_p];
314 }
315 }
317 if (longest_dash > 1e-18 && longest_dash < 0.5) {
318 // fake "shortening" of one-pixel marks by painting them lighter-than-black
319 gint rgb = 255 - (gint) (255 * longest_dash / 0.5);
320 gdk_rgb_gc_set_foreground (gc, SP_RGBA32_U_COMPOSE (rgb, rgb, rgb, rgb));
321 } else {
322 gdk_rgb_gc_set_foreground (gc, 0x00000000);
323 }
325 if (n_source_dashes > 0) {
326 // special cases:
327 if (all_even_are_zero (pattern, n_source_dashes)) {
328 ; // do not draw anything, only gaps are non-zero
329 } else if (all_odd_are_zero (pattern, n_source_dashes)) {
330 // draw solid line, only dashes are non-zero
331 gdk_gc_set_line_attributes (gc, DASH_PREVIEW_WIDTH,
332 GDK_LINE_SOLID, GDK_CAP_BUTT,
333 GDK_JOIN_MITER);
334 gdk_draw_line (pixmap, gc, 4, 8, DASH_PREVIEW_LENGTH, 8);
335 } else {
336 // regular pattern with both gaps and dashes non-zero
337 gdk_gc_set_line_attributes (gc, DASH_PREVIEW_WIDTH,
338 GDK_LINE_ON_OFF_DASH, GDK_CAP_BUTT,
339 GDK_JOIN_MITER);
340 gdk_gc_set_dashes (gc, 0, pixels_i, n_pixel_dashes);
341 gdk_draw_line (pixmap, gc, 4, 8, DASH_PREVIEW_LENGTH, 8);
342 }
343 } else {
344 // no pattern, draw solid line
345 gdk_gc_set_line_attributes (gc, DASH_PREVIEW_WIDTH,
346 GDK_LINE_SOLID, GDK_CAP_BUTT,
347 GDK_JOIN_MITER);
348 gdk_draw_line (pixmap, gc, 4, 8, DASH_PREVIEW_LENGTH, 8);
349 }
351 gdk_gc_unref (gc);
353 GtkWidget *px = gtk_pixmap_new (pixmap, NULL);
355 gdk_pixmap_unref (pixmap);
357 gtk_widget_show (px);
358 gtk_container_add (GTK_CONTAINER (mi), px);
360 gtk_object_set_data (GTK_OBJECT (mi), "pattern", pattern);
361 gtk_signal_connect (GTK_OBJECT (mi), "activate", G_CALLBACK (sp_dash_selector_dash_activate), dsel);
363 return mi;
364 }
366 static void
367 sp_dash_selector_dash_activate (GtkObject *object, SPDashSelector *dsel)
368 {
369 double *pattern = (double*)gtk_object_get_data (object, "pattern");
370 gtk_object_set_data (GTK_OBJECT (dsel), "pattern", pattern);
372 gtk_signal_emit (GTK_OBJECT (dsel), signals[CHANGED]);
373 }
375 static void
376 sp_dash_selector_offset_value_changed (GtkAdjustment *adj, SPDashSelector *dsel)
377 {
378 gtk_signal_emit (GTK_OBJECT (dsel), signals[CHANGED]);
379 }