2 * Copyright (C) 2009-2011 Andy Spencer <andy753421@gmail.com>
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 * SECTION:grits-marker
20 * @short_description: Single point markers
22 * Each #GritsMarker represents some point on the earth with some form of
23 * content. Commonly this is used to mark geographic features such as cities or
26 * While markers represent a place in three dimensions somewhere on, below, or
27 * above the surface of the earth, they are drawn in 2 dimensions so that they
28 * look normal and readable by the user. Due to this, GritsObjects should almost
29 * always be added to the GRITS_LEVEL_OVERLAY level so they are drawn "above" the
36 #include "grits-marker.h"
42 /* Texture setup functions */
43 static void render_point(GritsMarker *marker)
46 cairo_set_source_rgba(marker->cairo, 0, 0, 0, 1);
47 cairo_set_line_width(marker->cairo, marker->outline*2);
49 cairo_arc(marker->cairo, marker->xoff, marker->yoff, marker->radius,
51 cairo_stroke(marker->cairo);
54 cairo_set_source_rgba(marker->cairo, 1, 1, 1, 1);
56 cairo_arc(marker->cairo, marker->xoff, marker->yoff, marker->radius,
58 cairo_fill(marker->cairo);
61 static void render_label(GritsMarker *marker)
63 g_assert(marker->label);
65 cairo_set_source_rgba(marker->cairo, 0, 0, 0, 1);
66 cairo_select_font_face(marker->cairo, "sans-serif",
67 CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
68 cairo_set_font_size(marker->cairo, 13);
69 cairo_move_to(marker->cairo, marker->xoff + (marker->icon_width / 2),
70 marker->yoff - (marker->icon_height / 2));
71 cairo_text_path(marker->cairo, marker->label);
72 cairo_stroke(marker->cairo);
75 cairo_set_source_rgba(marker->cairo, 1, 1, 1, 1);
76 cairo_move_to(marker->cairo, marker->xoff + (marker->icon_width / 2),
77 marker->yoff - (marker->icon_height / 2));
78 cairo_show_text(marker->cairo, marker->label);
81 static void render_icon(GritsMarker *marker)
83 g_assert(marker->icon_img != NULL);
85 /* move to marker location */
86 cairo_translate(marker->cairo, marker->xoff, marker->yoff);
89 cairo_translate(marker->cairo, -marker->icon_width/2,
90 -marker->icon_height/2);
92 cairo_set_source_surface(marker->cairo, marker->icon_img, 0, 0);
94 cairo_paint(marker->cairo);
97 static void render_all(GritsMarker *marker)
100 if (marker->display_mask & GRITS_MARKER_DMASK_ICON)
103 if (marker->display_mask & GRITS_MARKER_DMASK_POINT)
104 render_point(marker);
106 if (marker->display_mask & GRITS_MARKER_DMASK_LABEL)
107 render_label(marker);
109 /* Load GL texture */
110 glEnable(GL_TEXTURE_2D);
111 glGenTextures(1, &marker->tex);
112 glBindTexture(GL_TEXTURE_2D, marker->tex);
113 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
114 glPixelStorei(GL_PACK_ALIGNMENT, 1);
115 glTexImage2D(GL_TEXTURE_2D, 0, 4, marker->width, marker->height,
116 0, GL_BGRA, GL_UNSIGNED_BYTE,
117 cairo_image_surface_get_data(cairo_get_target(marker->cairo)));
118 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
119 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
126 * @label: a short description of the marker
128 * Create a new GritsMarker which shows the given label when drawn.
130 * Returns: the new #GritsMarker.
132 GritsMarker *grits_marker_new(const gchar *label)
134 GritsMarker *marker = g_object_new(GRITS_TYPE_MARKER, NULL);
136 marker->display_mask = GRITS_MARKER_DMASK_POINT |
137 GRITS_MARKER_DMASK_LABEL;
139 //g_debug("GritsMarker: new - %s", label);
140 /* specify size of point and size of surface */
145 marker->icon_width = marker->radius * 2;
146 marker->icon_height = marker->radius * 3;
148 marker->xoff = marker->radius+marker->outline;
149 marker->yoff = marker->height-(marker->radius+marker->outline);
150 marker->cairo = cairo_create(cairo_image_surface_create(
151 CAIRO_FORMAT_ARGB32, marker->width, marker->height));
153 marker->label = g_strdup(label);
159 * grits_marker_icon_new:
160 * @label: The label to display if GRITS_MARKER_DMASK_LABEL is set
161 * @filename: The filename of the icon
162 * @angle: The angle to rotate the icon (0 is north)
163 * @flip: Whether to flip the image so that it's never upside down.
164 * Useful for non-symmetric icons which have an "up".
165 * @display_mask: A bitmask which specifies which items to display.
167 * Create a new marker with a label, point, icon (png), or any
168 * combination of the above.
170 * Returns: the new #GritsMarker
172 GritsMarker *grits_marker_icon_new(const gchar *label, const gchar *filename,
173 guint angle, gboolean flip, guint display_mask)
175 GritsMarker *marker = g_object_new(GRITS_TYPE_MARKER, NULL);
177 marker->label = g_strdup(label);
178 marker->angle = angle;
180 marker->display_mask = display_mask;
182 if (display_mask & GRITS_MARKER_DMASK_ICON) {
183 g_assert(filename != NULL);
184 g_debug("GritsMarker: marker_icon_new - marker image %s",
186 marker->icon_img = cairo_image_surface_create_from_png(filename);
187 if (cairo_surface_status(marker->icon_img)) {
188 g_warning("GritsMarker: marker_icon_new - "
189 "error reading file %s", filename);
190 /* convert it to a point, better than nothing */
191 marker->display_mask &= ~GRITS_MARKER_DMASK_ICON;
192 marker->display_mask |= GRITS_MARKER_DMASK_POINT;
193 marker->icon_width = 4;
194 marker->icon_height = 8;
198 cairo_image_surface_get_width(marker->icon_img);
199 marker->icon_height =
200 cairo_image_surface_get_height(marker->icon_img);
203 marker->icon_img = NULL;
204 marker->icon_width = 4; /* room for the point if there is one */
205 marker->icon_height = 8;
207 g_debug("GritsMarker: marker_icon_new - width = %d, height = %d",
208 marker->icon_width, marker->icon_height);
213 /* this is the surface size, a guess really */
214 marker->width = marker->icon_width + 128;
215 marker->height = marker->icon_height + 64;
217 marker->xoff = marker->width/2;
218 marker->yoff = marker->height/2;
219 marker->cairo = cairo_create(cairo_image_surface_create(
220 CAIRO_FORMAT_ARGB32, marker->width, marker->height));
222 /* clear the surface just in case */
223 cairo_set_operator(marker->cairo, CAIRO_OPERATOR_SOURCE);
224 //cairo_set_source_rgba(marker->cairo, 1.0, 0.0, 0.0, 0.3); // debug
225 cairo_set_source_rgba(marker->cairo, 1.0, 0.0, 0.0, 0.0);
226 cairo_paint(marker->cairo);
227 cairo_set_operator(marker->cairo, CAIRO_OPERATOR_OVER);
231 if (marker->icon_img)
232 cairo_surface_destroy(marker->icon_img);
239 static void grits_marker_draw(GritsObject *_marker, GritsOpenGL *opengl)
241 GritsMarker *marker = GRITS_MARKER(_marker);
242 GritsPoint *point = grits_object_center(marker);
244 cairo_surface_t *surface = cairo_get_target(marker->cairo);
245 gdouble width = cairo_image_surface_get_width(surface);
246 gdouble height = cairo_image_surface_get_height(surface);
253 grits_viewer_project(GRITS_VIEWER(opengl),
254 point->lat, point->lon, point->elev,
257 gint win_width = GTK_WIDGET(opengl)->allocation.width;
258 gint win_height = GTK_WIDGET(opengl)->allocation.height;
262 glMatrixMode(GL_PROJECTION); glLoadIdentity();
263 glMatrixMode(GL_MODELVIEW); glLoadIdentity();
264 glOrtho(0, win_width, win_height, 0, 1, -1);
265 glTranslated(px, win_height-py, 0);
266 glRotatef(marker->angle, 0, 0, -1);
267 glTranslated(-marker->xoff, -marker->yoff, 0);
269 gdouble scale, eye[3], pos[3] =
270 {point->lat, point->lon, point->elev};
271 grits_viewer_get_location(GRITS_VIEWER(opengl),
272 &eye[0], &eye[1], &eye[2]);
273 lle2xyz(eye[0], eye[1], eye[2],
274 &eye[0], &eye[1], &eye[2]);
275 lle2xyz(pos[0], pos[1], pos[2],
276 &pos[0], &pos[1], &pos[2]);
277 scale = MPPX(distd(eye, pos));
279 glRotatef(marker->angle, 0, 0, -1);
280 glRotatef(180, 1, 0, 0);
281 glScalef(scale, scale, 1);
282 glTranslated(-marker->xoff, -marker->yoff, 0);
285 //g_debug("GritsOpenGL: draw_marker - %s pz=%f ", marker->label, pz);
287 glDisable(GL_LIGHTING);
288 glDisable(GL_COLOR_MATERIAL);
289 glDisable(GL_DEPTH_TEST);
290 glEnable(GL_TEXTURE_2D);
291 glBindTexture(GL_TEXTURE_2D, marker->tex);
292 glDisable(GL_CULL_FACE);
294 glTexCoord2f(1, 0); glVertex3f(width, 0 , 0); // 0 - 3 0
295 glTexCoord2f(1, 1); glVertex3f(width, height, 0); // 1 - | |
296 glTexCoord2f(0, 1); glVertex3f(0 , height, 0); // 2 - | |
297 glTexCoord2f(0, 0); glVertex3f(0 , 0 , 0); // 3 - 2----1
303 G_DEFINE_TYPE(GritsMarker, grits_marker, GRITS_TYPE_OBJECT);
304 static void grits_marker_init(GritsMarker *marker)
306 marker->ortho = TRUE;
309 static void grits_marker_finalize(GObject *_marker)
311 //g_debug("GritsMarker: finalize - %s", marker->label);
312 GritsMarker *marker = GRITS_MARKER(_marker);
314 glDeleteTextures(1, &marker->tex);
316 cairo_surface_t *surface = cairo_get_target(marker->cairo);
317 cairo_surface_destroy(surface);
318 cairo_destroy(marker->cairo);
320 g_free(marker->label);
323 static void grits_marker_class_init(GritsMarkerClass *klass)
325 g_debug("GritsMarker: class_init");
326 GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
327 gobject_class->finalize = grits_marker_finalize;
329 GritsObjectClass *object_class = GRITS_OBJECT_CLASS(klass);
330 object_class->draw = grits_marker_draw;