3 * GtkCompass: Display heading/compass information
4 * Also bearing to target and next waypoint.
6 * Copyright (C) 2007 Kaj-Michael Lang
7 * Originanl non-widget version Copyright Cezary Jackiewicz
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Library General Public License for more details.
19 * You should have received a copy of the GNU Library General Public
20 * License along with this library; if not, write to the Free
21 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include <glib/gstdio.h>
28 #include <glib-object.h>
29 #include "gtkcompass.h"
35 static void gtk_compass_finalize (GObject *object);
36 static void gtk_compass_size_request (GtkWidget *widget, GtkRequisition *requisition);
37 static void gtk_compass_size_allocate (GtkWidget *widget, GtkAllocation *allocate);
38 static gboolean gtk_compass_expose (GtkWidget *widget, GdkEventExpose *event);
39 static void gtk_compass_realize (GtkWidget *widget);
40 static void gtk_compass_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
41 static void gtk_compass_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
42 static void gtk_compass_paint(GtkCompass *compass);
43 static gboolean gtk_compass_refresh_cb(GtkWidget *widget);
45 G_DEFINE_TYPE(GtkCompass, gtk_compass, GTK_TYPE_WIDGET);
47 #define BOUND(x, a, b) { \
54 typedef struct _GtkCompassPriv GtkCompassPriv;
56 struct _GtkCompassPriv
58 PangoContext *context;
60 PangoFontDescription *fontdesc;
63 #define GTK_COMPASS_GET_PRIVATE(o) \
64 (G_TYPE_INSTANCE_GET_PRIVATE ((o), GTK_COMPASS, GtkCompassPriv))
67 gtk_compass_class_init (GtkCompassClass *class)
69 GObjectClass *object_class;
70 GtkWidgetClass *widget_class;
72 object_class = (GObjectClass*) class;
73 widget_class = (GtkWidgetClass*) class;
75 object_class->finalize = gtk_compass_finalize;
76 object_class->set_property = gtk_compass_set_property;
77 object_class->get_property = gtk_compass_get_property;
79 widget_class->size_request = gtk_compass_size_request;
80 widget_class->expose_event = gtk_compass_expose;
81 widget_class->realize = gtk_compass_realize;
82 widget_class->size_allocate = gtk_compass_size_allocate;
84 g_type_class_add_private (object_class, sizeof (GtkCompassPriv));
88 gtk_compass_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
91 g_return_if_fail(GTK_IS_COMPASS(object));
92 compass=GTK_COMPASS(object);
95 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
101 gtk_compass_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
104 g_return_if_fail(GTK_IS_COMPASS(object));
105 compass=GTK_COMPASS(object);
108 G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
114 gtk_compass_init(GtkCompass *compass)
119 compass->dest_valid=FALSE;
120 compass->way_valid=FALSE;
127 gtk_compass_cb_button_press(GtkWidget *widget, GdkEventButton *event)
131 compass=GTK_COMPASS(widget);
134 compass->data->heading=0;
135 compass->heading=180;
142 gtk_compass_new(GpsData *data)
147 compass=gtk_type_new(gtk_compass_get_type ());
148 widget=GTK_WIDGET(compass);
151 g_signal_connect(G_OBJECT(widget), "button_press_event", G_CALLBACK(gtk_compass_cb_button_press), NULL);
153 compass->esid=g_timeout_add(1000,(GSourceFunc)gtk_compass_refresh_cb, compass);
159 gtk_compass_finalize(GObject *object)
163 g_return_if_fail(GTK_IS_COMPASS(object));
164 compass=GTK_COMPASS(object);
165 g_source_remove(compass->esid);
167 if (GTK_WIDGET(object)->parent && GTK_WIDGET_MAPPED(object)) {
168 gtk_widget_unmap(GTK_WIDGET(object));
171 G_OBJECT_CLASS(gtk_compass_parent_class)->finalize(object);
175 gtk_compass_size_request(GtkWidget *widget, GtkRequisition *requisition)
179 g_return_if_fail(GTK_IS_COMPASS(widget));
180 g_return_if_fail(requisition != NULL);
182 compass=GTK_COMPASS(widget);
184 requisition->width=400;
185 requisition->height=300;
191 gtk_compass_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
195 g_return_if_fail(GTK_IS_COMPASS(widget));
196 g_return_if_fail(allocation!=NULL);
198 compass=GTK_COMPASS(widget);
200 widget->allocation=*allocation;
202 if (GTK_WIDGET_REALIZED (widget)) {
203 gdk_window_move_resize (widget->window,
204 allocation->x, allocation->y,
205 allocation->width, allocation->height);
208 compass->width=allocation->width;
209 compass->height=allocation->height;
211 compass->size = MIN(widget->allocation.width, widget->allocation.height);
212 if (widget->allocation.width > widget->allocation.height) {
213 compass->xoffset = (widget->allocation.width - widget->allocation.height) / 2;
214 compass->yoffset = 0;
216 compass->xoffset = 0;
217 compass->yoffset = (widget->allocation.height - widget->allocation.width) / 2;
223 gtk_compass_realize (GtkWidget *widget)
227 GdkWindowAttr attributes;
228 gint attributes_mask;
230 g_return_if_fail (GTK_IS_COMPASS(widget));
231 GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
232 compass=GTK_COMPASS(widget);
234 attributes.x=widget->allocation.x;
235 attributes.y=widget->allocation.y;
236 attributes.width=widget->allocation.width;
237 attributes.height=widget->allocation.height;
238 attributes.wclass=GDK_INPUT_OUTPUT;
239 attributes.window_type=GDK_WINDOW_CHILD;
240 attributes.event_mask=gtk_widget_get_events(widget) | GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK;
241 attributes.visual=gtk_widget_get_visual(widget);
242 attributes.colormap=gtk_widget_get_colormap(widget);
244 attributes_mask=GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
246 widget->window=gdk_window_new(gtk_widget_get_parent_window(widget), &attributes, attributes_mask);
247 widget->style=gtk_style_attach(widget->style, widget->window);
249 gdk_window_set_user_data(widget->window, widget);
250 gtk_style_set_background(widget->style, widget->window, GTK_STATE_ACTIVE);
252 compass->context=gtk_widget_get_pango_context(widget);
253 compass->layout=pango_layout_new(compass->context);
254 compass->fontdesc=pango_font_description_new();
255 pango_font_description_set_family(compass->fontdesc, "Sans Serif");
256 pango_font_description_set_size(compass->fontdesc, 12*PANGO_SCALE);
257 pango_layout_set_font_description(compass->layout, compass->fontdesc);
258 pango_layout_set_alignment(compass->layout, PANGO_ALIGN_CENTER);
260 if (!compass->gc_h) {
264 compass->gc_h=gdk_gc_new(widget->window);
265 gdk_gc_set_rgb_fg_color(compass->gc_h, &color);
266 gdk_gc_set_line_attributes(compass->gc_h, 2, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND);
269 if (!compass->gc_d) {
273 compass->gc_d=gdk_gc_new(widget->window);
274 gdk_gc_set_rgb_fg_color(compass->gc_d, &color);
275 gdk_gc_set_line_attributes(compass->gc_d, 6, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND);
278 if (!compass->gc_w) {
282 compass->gc_w=gdk_gc_new(widget->window);
283 gdk_gc_set_rgb_fg_color(compass->gc_w, &color);
284 gdk_gc_set_line_attributes(compass->gc_w, 6, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND);
290 gtk_compass_draw_mark(GtkCompass *compass, GdkGC *gc, gfloat angle, gint size)
295 widget=GTK_WIDGET(compass);
299 gdk_draw_line(widget->window,gc,
300 compass->xoffset+hs+((hs-size)*sinf(angle)),
301 compass->yoffset+compass->size-((hs-size)*cosf(angle)),
302 compass->xoffset+hs+((hs+size)*sinf(angle)),
303 compass->yoffset+compass->size-((hs+size)*cosf(angle)));
307 gtk_compass_paint(GtkCompass *compass)
310 guint i, x, y, size, hsize, fs;
315 gint angle[5] = { -90, -45, 0, 45, 90 };
316 gint fsize[5] = { 0, 4, 10, 4, 0 };
318 widget=GTK_WIDGET(compass);
329 pango_context_set_matrix (compass->context, NULL);
331 g_snprintf(htext, 8, "%3.0f°", compass->data->heading);
332 pango_font_description_set_size(compass->fontdesc, (10+fs) * PANGO_SCALE);
333 pango_layout_set_font_description(compass->layout, compass->fontdesc);
334 pango_layout_set_text(compass->layout, htext, -1);
335 pango_layout_get_pixel_size(compass->layout, &x, &y);
337 gdk_draw_layout(widget->window,
339 compass->xoffset+hsize-x/2,
340 compass->yoffset+size-y-2, compass->layout);
342 gdk_draw_arc(widget->window,
345 compass->xoffset, compass->yoffset+hsize, size - fs, size - fs, 0, 64 * 360);
347 /* Simple arrow for heading */
348 gdk_draw_line(widget->window,
350 compass->xoffset + hsize + 3,
351 compass->yoffset + size - y - 5,
352 compass->xoffset + hsize, compass->yoffset + hsize + 5);
354 gdk_draw_line(widget->window,
356 compass->xoffset + hsize - 3,
357 compass->yoffset + size - y - 5,
358 compass->xoffset + hsize, compass->yoffset + hsize + 5);
360 gdk_draw_line(widget->window,
362 compass->xoffset + hsize - 3,
363 compass->yoffset + size - y - 5,
364 compass->xoffset + hsize, compass->yoffset + size - y - 8);
366 gdk_draw_line(widget->window,
368 compass->xoffset + hsize + 3,
369 compass->yoffset + size - y - 5,
370 compass->xoffset + hsize, compass->yoffset + size - y - 8);
372 for (i = 0; i < 5; i++) {
373 PangoMatrix matrix = PANGO_MATRIX_INIT;
374 dir = (gint) (compass->heading / 45) * 45 + angle[i];
410 tmp = ((dir - compass->heading) * (1.f / 180.f)) * G_PI;
412 gtk_compass_draw_mark(compass, compass->gc_h, tmp, 6);
415 if (abs((guint) (compass->heading / 45) * 45 - compass->heading)
416 > abs((guint) (compass->heading / 45) * 45 + 45 - compass->heading) && (i > 0))
419 pango_font_description_set_size(compass->fontdesc, (10 + x + fs) * PANGO_SCALE);
420 pango_layout_set_font_description(compass->layout, compass->fontdesc);
421 pango_layout_set_text(compass->layout, text, -1);
422 pango_matrix_rotate (&matrix, -(dir-compass->heading));
423 pango_context_set_matrix (compass->context, &matrix);
424 pango_layout_get_pixel_size(compass->layout, &x, &y);
425 x = compass->xoffset + hsize + ((hsize + 15 + fs) * sinf(tmp)) - x / 2,
426 y = compass->yoffset + size - ((hsize + 15 + fs) * cosf(tmp)) - y / 2,
427 gdk_draw_layout(widget->window, compass->gc_h, x, y, compass->layout);
430 if (compass->dest_valid) {
431 tmp=((compass->dest_heading-compass->heading) * (1.f / 180.f)) * G_PI;
432 gtk_compass_draw_mark(compass, compass->gc_d, tmp, 10);
435 if (compass->way_valid) {
436 tmp=((compass->way_heading-compass->heading) * (1.f / 180.f)) * G_PI;
437 gtk_compass_draw_mark(compass, compass->gc_w, tmp, 10);
444 gtk_compass_expose(GtkWidget *widget, GdkEventExpose *event)
448 g_return_val_if_fail(GTK_IS_COMPASS(widget), FALSE);
449 g_return_val_if_fail(event != NULL, FALSE);
451 compass=GTK_COMPASS(widget);
452 gtk_compass_paint(compass);
457 gtk_compass_refresh_cb(GtkWidget *widget)
462 g_return_val_if_fail(GTK_IS_COMPASS(widget), FALSE);
464 compass=GTK_COMPASS(widget);
466 if ((GTK_WIDGET_MAPPED(widget)==FALSE) || (GTK_WIDGET_VISIBLE(widget)==FALSE)) {
467 compass->heading=compass->data->heading;
471 if (compass->heading==compass->data->heading)
474 tmp=fabsf(compass->heading-compass->data->heading);
478 compass->heading=compass->data->heading;
480 if (compass->heading<compass->data->heading)
481 compass->heading+=tmp;
483 if (compass->heading>compass->data->heading)
484 compass->heading-=tmp;
487 g_printf("%.2f %.2f\n", compass->heading, compass->data->heading);
490 gtk_widget_queue_draw_area(widget, 0, 0, compass->width, compass->height);
495 gtk_compass_refresh(GtkWidget *widget)
499 g_return_if_fail(GTK_IS_COMPASS(widget));
501 compass=GTK_COMPASS(widget);
502 gtk_widget_queue_draw_area(widget, 0, 0, compass->width, compass->height);
506 gtk_compass_set_way_heading(GtkWidget *widget, gboolean valid, gfloat heading)
509 g_return_if_fail(GTK_IS_COMPASS(widget));
511 compass=GTK_COMPASS(widget);
513 compass->way_valid=valid;
514 compass->way_heading=heading;
516 gtk_widget_queue_draw_area(widget, 0, 0, compass->width, compass->height);
520 gtk_compass_set_dest_heading(GtkWidget *widget, gboolean valid, gfloat heading)
523 g_return_if_fail(GTK_IS_COMPASS(widget));
525 compass=GTK_COMPASS(widget);
527 compass->dest_valid=valid;
528 compass->dest_heading=heading;
530 compass=GTK_COMPASS(widget);
531 gtk_widget_queue_draw_area(widget, 0, 0, compass->width, compass->height);