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Source at commit 8a1a3103964533b0d517a29312ddeabdab1d6271 created 9 years 2 months ago. By Werner Almesberger, inst.c (find_point_vec): correct indentation | |
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1 | /* |
2 | * gui_util.c - GUI helper functions |
3 | * |
4 | * Written 2009, 2010 by Werner Almesberger |
5 | * Copyright 2009, 2010 by Werner Almesberger |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; either version 2 of the License, or |
10 | * (at your option) any later version. |
11 | */ |
12 | |
13 | |
14 | #include <stdlib.h> |
15 | #include <math.h> |
16 | #include <gtk/gtk.h> |
17 | |
18 | #include "util.h" |
19 | #include "gui_style.h" |
20 | #include "gui.h" |
21 | #include "gui_util.h" |
22 | |
23 | |
24 | struct draw_ctx draw_ctx; |
25 | |
26 | |
27 | /* ----- look up a color --------------------------------------------------- */ |
28 | |
29 | |
30 | GdkColor get_color(const char *spec) |
31 | { |
32 | GdkColormap *cmap; |
33 | GdkColor color; |
34 | |
35 | cmap = gdk_drawable_get_colormap(root->window); |
36 | if (!gdk_color_parse(spec, &color)) |
37 | abort(); |
38 | if (!gdk_colormap_alloc_color(cmap, &color, FALSE, TRUE)) |
39 | abort(); |
40 | return color; |
41 | } |
42 | |
43 | |
44 | /* ----- lines with a width ------------------------------------------------ */ |
45 | |
46 | |
47 | void set_width(GdkGC *gc, int width) |
48 | { |
49 | gdk_gc_set_line_attributes(gc, width < 1 ? 1 : width, |
50 | GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND); |
51 | } |
52 | |
53 | |
54 | /* ----- backing store ----------------------------------------------------- */ |
55 | |
56 | |
57 | void free_pix_buf(struct pix_buf *buf) |
58 | { |
59 | g_object_unref(G_OBJECT(buf->buf)); |
60 | free(buf); |
61 | } |
62 | |
63 | |
64 | struct pix_buf *save_pix_buf(GdkDrawable *da, int xa, int ya, int xb, int yb, |
65 | int border) |
66 | { |
67 | struct pix_buf *buf; |
68 | int w, h; |
69 | |
70 | if (xa > xb) |
71 | SWAP(xa, xb); |
72 | if (ya > yb) |
73 | SWAP(ya, yb); |
74 | buf = alloc_type(struct pix_buf); |
75 | buf->da = da; |
76 | buf->x = xa-border; |
77 | buf->y = ya-border; |
78 | w = xb-xa+1+2*border; |
79 | h = yb-ya+1+2*border; |
80 | if (buf->x < 0) { |
81 | w += buf->x; |
82 | buf->x = 0; |
83 | } |
84 | if (buf->y < 0) { |
85 | h += buf->y; |
86 | buf->y = 0; |
87 | } |
88 | buf->buf = gdk_pixbuf_get_from_drawable(NULL, da, NULL, |
89 | buf->x, buf->y, 0, 0, w, h); |
90 | return buf; |
91 | } |
92 | |
93 | |
94 | void restore_pix_buf(struct pix_buf *buf) |
95 | { |
96 | gdk_draw_pixbuf(buf->da, NULL, buf->buf, 0, 0, buf->x, buf->y, -1, -1, |
97 | GDK_RGB_DITHER_NORMAL, 0, 0); |
98 | free_pix_buf(buf); |
99 | } |
100 | |
101 | |
102 | /* ----- arcs and circles -------------------------------------------------- */ |
103 | |
104 | |
105 | void draw_arc(GdkDrawable *da, GdkGC *gc, int fill, |
106 | int x, int y, int r, double a1, double a2) |
107 | { |
108 | /* |
109 | * This adjustment handles two distinct cases: |
110 | * - if a1 == a2, we make sure we draw a full circle |
111 | * - the end angle a2 must always be greater than the start angle a1 |
112 | */ |
113 | if (a2 <= a1) |
114 | a2 += 360; |
115 | gdk_draw_arc(da, gc, fill, x-r, y-r, 2*r, 2*r, a1*64, (a2-a1)*64); |
116 | } |
117 | |
118 | |
119 | void draw_circle(GdkDrawable *da, GdkGC *gc, int fill, |
120 | int x, int y, int r) |
121 | { |
122 | draw_arc(da, gc, fill, x, y, r, 0, 360); |
123 | } |
124 | |
125 | |
126 | /* ----- labels in a box --------------------------------------------------- */ |
127 | |
128 | |
129 | GtkWidget *label_in_box_new(const char *s, const char *tooltip) |
130 | { |
131 | GtkWidget *evbox, *label; |
132 | |
133 | evbox = gtk_event_box_new(); |
134 | label = gtk_label_new(s); |
135 | gtk_misc_set_padding(GTK_MISC(label), 1, 1); |
136 | gtk_container_add(GTK_CONTAINER(evbox), label); |
137 | if (tooltip) |
138 | gtk_widget_set_tooltip_markup(evbox, tooltip); |
139 | return label; |
140 | } |
141 | |
142 | |
143 | GtkWidget *box_of_label(GtkWidget *label) |
144 | { |
145 | return gtk_widget_get_ancestor(label, GTK_TYPE_EVENT_BOX); |
146 | } |
147 | |
148 | |
149 | void label_in_box_fg(GtkWidget *label, const char *color) |
150 | { |
151 | GdkColor col = get_color(color); |
152 | |
153 | gtk_widget_modify_fg(label, GTK_STATE_NORMAL, &col); |
154 | } |
155 | |
156 | |
157 | void label_in_box_bg(GtkWidget *label, const char *color) |
158 | { |
159 | GtkWidget *box; |
160 | GdkColor col = get_color(color); |
161 | |
162 | box = box_of_label(label); |
163 | gtk_widget_modify_bg(box, GTK_STATE_NORMAL, &col); |
164 | } |
165 | |
166 | |
167 | /* ----- generate a tool button with an XPM image -------------------------- */ |
168 | |
169 | |
170 | GtkWidget *make_image(GdkDrawable *drawable, char **xpm, const char *tooltip) |
171 | { |
172 | GdkPixmap *pixmap; |
173 | GtkWidget *image; |
174 | GdkColor white = get_color("white"); |
175 | |
176 | pixmap = gdk_pixmap_create_from_xpm_d(drawable, NULL, &white, xpm); |
177 | image = gtk_image_new_from_pixmap(pixmap, NULL); |
178 | gtk_misc_set_padding(GTK_MISC(image), 1, 1); |
179 | if (tooltip) |
180 | gtk_widget_set_tooltip_markup(image, tooltip); |
181 | return image; |
182 | } |
183 | |
184 | |
185 | GtkWidget *make_transparent_image(GdkDrawable *drawable, char **xpm, |
186 | const char *tooltip) |
187 | { |
188 | GdkPixmap *pixmap; |
189 | GdkBitmap *mask; |
190 | GtkWidget *image; |
191 | |
192 | pixmap = gdk_pixmap_create_from_xpm_d(drawable, &mask, NULL, xpm); |
193 | image = gtk_image_new_from_pixmap(pixmap, mask); |
194 | gtk_misc_set_padding(GTK_MISC(image), 1, 1); |
195 | if (tooltip) |
196 | gtk_widget_set_tooltip_markup(image, tooltip); |
197 | return image; |
198 | } |
199 | |
200 | |
201 | static void remove_child(GtkWidget *widget, gpointer data) |
202 | { |
203 | gtk_container_remove(GTK_CONTAINER(data), widget); |
204 | } |
205 | |
206 | |
207 | void vacate_widget(GtkWidget *widget) |
208 | { |
209 | gtk_container_foreach(GTK_CONTAINER(widget), remove_child, widget); |
210 | } |
211 | |
212 | |
213 | void set_image(GtkWidget *widget, GtkWidget *image) |
214 | { |
215 | vacate_widget(widget); |
216 | gtk_container_add(GTK_CONTAINER(widget), image); |
217 | gtk_widget_show_all(widget); |
218 | } |
219 | |
220 | |
221 | GtkWidget *tool_button(GtkWidget *bar, GdkDrawable *drawable, |
222 | char **xpm, const char *tooltip, |
223 | gboolean (*cb)(GtkWidget *widget, GdkEventButton *event, gpointer data), |
224 | gpointer data) |
225 | { |
226 | GtkWidget *image, *evbox; |
227 | GtkToolItem *item; |
228 | |
229 | /* |
230 | * gtk_radio_tool_button_new_from_widget is *huge*. We try to do things |
231 | * in a |
232 | * more compact way. |
233 | */ |
234 | |
235 | evbox = gtk_event_box_new(); |
236 | if (xpm) { |
237 | image = make_image(drawable, xpm, tooltip); |
238 | gtk_container_add(GTK_CONTAINER(evbox), image); |
239 | } |
240 | g_signal_connect(G_OBJECT(evbox), "button_press_event", |
241 | G_CALLBACK(cb), data); |
242 | |
243 | item = gtk_tool_item_new(); |
244 | gtk_container_add(GTK_CONTAINER(item), evbox); |
245 | |
246 | gtk_container_set_border_width(GTK_CONTAINER(item), 0); |
247 | |
248 | gtk_toolbar_insert(GTK_TOOLBAR(bar), item, -1); |
249 | |
250 | return evbox; |
251 | } |
252 | |
253 | |
254 | /* ----- render a text string ---------------------------------------------- */ |
255 | |
256 | |
257 | void render_text(GdkDrawable *da, GdkGC *gc, int x, int y, double angle, |
258 | const char *s, const char *font, double xalign, double yalign, |
259 | int xmax, int ymax) |
260 | { |
261 | GdkScreen *screen; |
262 | PangoRenderer *renderer; |
263 | PangoContext *context; |
264 | PangoLayout *layout; |
265 | PangoFontDescription *desc; |
266 | int width, height; |
267 | PangoMatrix m = PANGO_MATRIX_INIT; |
268 | double f_min, f; |
269 | |
270 | /* set up the renderer */ |
271 | |
272 | screen = gdk_drawable_get_screen(da); |
273 | renderer = gdk_pango_renderer_get_default(screen); |
274 | gdk_pango_renderer_set_drawable(GDK_PANGO_RENDERER(renderer), da); |
275 | gdk_pango_renderer_set_gc(GDK_PANGO_RENDERER(renderer), gc); |
276 | |
277 | /* start preparing the layout */ |
278 | |
279 | context = gdk_pango_context_get_for_screen(screen); |
280 | layout = pango_layout_new(context); |
281 | pango_layout_set_text(layout, s, -1); |
282 | |
283 | /* apply the font */ |
284 | |
285 | desc = pango_font_description_from_string(font); |
286 | pango_layout_set_font_description(layout, desc); |
287 | pango_font_description_free(desc); |
288 | |
289 | /* align and position the text */ |
290 | |
291 | pango_layout_get_size(layout, &width, &height); |
292 | f_min = 1.0; |
293 | if (xmax) { |
294 | f = xmax/((double) width/PANGO_SCALE); |
295 | if (f < f_min) |
296 | f_min = f; |
297 | } |
298 | if (ymax) { |
299 | f = ymax/((double) height/PANGO_SCALE); |
300 | if (f < f_min) |
301 | f_min = f; |
302 | } |
303 | if (f_min < MIN_FONT_SCALE) |
304 | f_min = MIN_FONT_SCALE; |
305 | pango_matrix_translate(&m, x, y); |
306 | pango_matrix_rotate(&m, angle); |
307 | pango_matrix_translate(&m, |
308 | -xalign*f_min*width/PANGO_SCALE, |
309 | (yalign-1)*f_min*height/PANGO_SCALE); |
310 | pango_matrix_scale(&m, f_min, f_min); |
311 | |
312 | pango_context_set_matrix(context, &m); |
313 | pango_layout_context_changed(layout); |
314 | pango_renderer_draw_layout(renderer, layout, 0, 0); |
315 | |
316 | /* clean up renderer */ |
317 | |
318 | gdk_pango_renderer_set_drawable(GDK_PANGO_RENDERER(renderer), NULL); |
319 | gdk_pango_renderer_set_gc(GDK_PANGO_RENDERER(renderer), NULL); |
320 | |
321 | /* free objects */ |
322 | |
323 | g_object_unref(layout); |
324 | g_object_unref(context); |
325 | } |
326 | |
327 | |
328 | /* ----- Debugging support ------------------------------------------------- */ |
329 | |
330 | |
331 | /* |
332 | * View with make montage or something like |
333 | * |
334 | * montage -label %f -frame 3 __dbg????.png png:- | display - |
335 | */ |
336 | |
337 | void debug_save_pixbuf(GdkPixbuf *buf) |
338 | { |
339 | static int buf_num = 0; |
340 | char name[20]; /* plenty */ |
341 | |
342 | sprintf(name, "__dbg%04d.png", buf_num++); |
343 | gdk_pixbuf_save(buf, name, "png", NULL, NULL); |
344 | fprintf(stderr, "saved to %s\n", name); |
345 | } |
346 | |
347 | |
348 | /* |
349 | * gtk_widget_get_snapshot seems to use an expose event to do the drawing. This |
350 | * means that we can't call debug_save_widget from the expose event handler of |
351 | * the widget being dumped. |
352 | */ |
353 | |
354 | #if GTK_CHECK_VERSION(2, 14, 0) |
355 | |
356 | void debug_save_widget(GtkWidget *widget) |
357 | { |
358 | GdkPixmap *pixmap; |
359 | GdkPixbuf *pixbuf; |
360 | gint w, h; |
361 | |
362 | pixmap = gtk_widget_get_snapshot(widget, NULL); |
363 | gdk_drawable_get_size(GDK_DRAWABLE(pixmap), &w, &h); |
364 | pixbuf = gdk_pixbuf_get_from_drawable(NULL, GDK_DRAWABLE(pixmap), |
365 | NULL, 0, 0, 0, 0, w, h); |
366 | debug_save_pixbuf(pixbuf); |
367 | gdk_pixmap_unref(pixmap); |
368 | g_object_unref(pixbuf); |
369 | } |
370 | |
371 | #endif /* GTK_CHECK_VERSION(2, 14, 0) */ |
372 | |
373 | |
374 | /* ----- kill the content of a container ----------------------------------- */ |
375 | |
376 | |
377 | static void destroy_callback(GtkWidget *widget, gpointer data) |
378 | { |
379 | gtk_widget_destroy(widget); |
380 | } |
381 | |
382 | |
383 | void destroy_all_children(GtkContainer *container) |
384 | { |
385 | gtk_container_foreach(container, destroy_callback, NULL); |
386 | } |
387 | |
388 | |
389 | /* ----- get a widget's desired width -------------------------------------- */ |
390 | |
391 | |
392 | int get_widget_width(GtkWidget *widget) |
393 | { |
394 | GtkRequisition req; |
395 | |
396 | gtk_widget_show_all(widget); |
397 | gtk_widget_size_request(widget, &req); |
398 | return req.width; |
399 | } |
400 |
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