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"
38 /* Texture setup functions */
39 static void render_point(GritsMarker *marker)
42 cairo_set_line_join(marker->cairo, CAIRO_LINE_JOIN_ROUND);
43 cairo_set_line_width(marker->cairo, marker->outline*2);
44 cairo_set_source_rgba(marker->cairo, 0, 0, 0, 1);
46 cairo_arc(marker->cairo, marker->xoff, marker->yoff, marker->radius,
48 cairo_stroke(marker->cairo);
51 cairo_set_source_rgba(marker->cairo, 1, 1, 1, 1);
53 cairo_arc(marker->cairo, marker->xoff, marker->yoff, marker->radius,
55 cairo_fill(marker->cairo);
58 static void render_label(GritsMarker *marker)
60 g_assert(marker->label);
63 cairo_set_line_join(marker->cairo, CAIRO_LINE_JOIN_ROUND);
64 cairo_set_line_width(marker->cairo, marker->outline*2);
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 GRITS_OBJECT(marker)->skip = GRITS_SKIP_CENTER;
138 marker->display_mask = GRITS_MARKER_DMASK_POINT |
139 GRITS_MARKER_DMASK_LABEL;
141 //g_debug("GritsMarker: new - %s", label);
142 /* specify size of point and size of surface */
147 marker->icon_width = marker->radius * 2;
148 marker->icon_height = marker->radius * 3;
150 marker->xoff = marker->radius+marker->outline;
151 marker->yoff = marker->height-(marker->radius+marker->outline);
152 marker->cairo = cairo_create(cairo_image_surface_create(
153 CAIRO_FORMAT_ARGB32, marker->width, marker->height));
155 marker->label = g_strdup(label);
161 * grits_marker_icon_new:
162 * @label: The label to display if GRITS_MARKER_DMASK_LABEL is set
163 * @filename: The filename of the icon
164 * @angle: The angle to rotate the icon (0 is north)
165 * @flip: Whether to flip the image so that it's never upside down.
166 * Useful for non-symmetric icons which have an "up".
167 * @display_mask: A bitmask which specifies which items to display.
169 * Create a new marker with a label, point, icon (png), or any
170 * combination of the above.
172 * Returns: the new #GritsMarker
174 GritsMarker *grits_marker_icon_new(const gchar *label, const gchar *filename,
175 guint angle, gboolean flip, guint display_mask)
177 GritsMarker *marker = g_object_new(GRITS_TYPE_MARKER, NULL);
179 marker->label = g_strdup(label);
180 marker->angle = angle;
182 marker->display_mask = display_mask;
184 if (display_mask & GRITS_MARKER_DMASK_ICON) {
185 g_assert(filename != NULL);
186 g_debug("GritsMarker: marker_icon_new - marker image %s",
188 marker->icon_img = cairo_image_surface_create_from_png(filename);
189 if (cairo_surface_status(marker->icon_img)) {
190 g_warning("GritsMarker: marker_icon_new - "
191 "error reading file %s", filename);
192 /* convert it to a point, better than nothing */
193 marker->display_mask &= ~GRITS_MARKER_DMASK_ICON;
194 marker->display_mask |= GRITS_MARKER_DMASK_POINT;
195 marker->icon_width = 4;
196 marker->icon_height = 8;
200 cairo_image_surface_get_width(marker->icon_img);
201 marker->icon_height =
202 cairo_image_surface_get_height(marker->icon_img);
205 marker->icon_img = NULL;
206 marker->icon_width = 4; /* room for the point if there is one */
207 marker->icon_height = 8;
209 g_debug("GritsMarker: marker_icon_new - width = %d, height = %d",
210 marker->icon_width, marker->icon_height);
215 /* this is the surface size, a guess really */
216 marker->width = marker->icon_width + 128;
217 marker->height = marker->icon_height + 64;
219 marker->xoff = marker->width/2;
220 marker->yoff = marker->height/2;
221 marker->cairo = cairo_create(cairo_image_surface_create(
222 CAIRO_FORMAT_ARGB32, marker->width, marker->height));
224 /* clear the surface just in case */
225 cairo_set_operator(marker->cairo, CAIRO_OPERATOR_SOURCE);
226 //cairo_set_source_rgba(marker->cairo, 1.0, 0.0, 0.0, 0.3); // debug
227 cairo_set_source_rgba(marker->cairo, 1.0, 0.0, 0.0, 0.0);
228 cairo_paint(marker->cairo);
229 cairo_set_operator(marker->cairo, CAIRO_OPERATOR_OVER);
233 if (marker->icon_img)
234 cairo_surface_destroy(marker->icon_img);
241 static void grits_marker_draw(GritsObject *_marker, GritsOpenGL *opengl)
243 GritsMarker *marker = GRITS_MARKER(_marker);
244 GritsPoint *point = grits_object_center(marker);
246 cairo_surface_t *surface = cairo_get_target(marker->cairo);
247 gdouble width = cairo_image_surface_get_width(surface);
248 gdouble height = cairo_image_surface_get_height(surface);
255 grits_viewer_project(GRITS_VIEWER(opengl),
256 point->lat, point->lon, point->elev,
263 gtk_widget_get_allocation(GTK_WIDGET(opengl), &alloc);
264 glTranslated(px, alloc.height-py, 0);
265 glRotatef(marker->angle, 0, 0, -1);
266 glTranslated(-marker->xoff, -marker->yoff, 0);
268 gdouble scale, eye[3], pos[3] =
269 {point->lat, point->lon, point->elev};
270 grits_viewer_get_location(GRITS_VIEWER(opengl),
271 &eye[0], &eye[1], &eye[2]);
272 lle2xyz(eye[0], eye[1], eye[2],
273 &eye[0], &eye[1], &eye[2]);
274 lle2xyz(pos[0], pos[1], pos[2],
275 &pos[0], &pos[1], &pos[2]);
276 scale = MPPX(distd(eye, pos));
278 glRotatef(marker->angle, 0, 0, -1);
279 glRotatef(180, 1, 0, 0);
280 glScalef(scale, scale, 1);
281 glTranslated(-marker->xoff, -marker->yoff, 0);
284 //g_debug("GritsOpenGL: draw_marker - %s pz=%f ", marker->label, pz);
286 glDisable(GL_LIGHTING);
287 glDisable(GL_COLOR_MATERIAL);
288 glDisable(GL_DEPTH_TEST);
289 glEnable(GL_TEXTURE_2D);
290 glBindTexture(GL_TEXTURE_2D, marker->tex);
291 glDisable(GL_CULL_FACE);
293 glTexCoord2f(1, 0); glVertex3f(width, 0 , 0); // 0 - 3 0
294 glTexCoord2f(1, 1); glVertex3f(width, height, 0); // 1 - | |
295 glTexCoord2f(0, 1); glVertex3f(0 , height, 0); // 2 - | |
296 glTexCoord2f(0, 0); glVertex3f(0 , 0 , 0); // 3 - 2----1
302 G_DEFINE_TYPE(GritsMarker, grits_marker, GRITS_TYPE_OBJECT);
303 static void grits_marker_init(GritsMarker *marker)
305 marker->ortho = TRUE;
308 static void grits_marker_finalize(GObject *_marker)
310 //g_debug("GritsMarker: finalize - %s", marker->label);
311 GritsMarker *marker = GRITS_MARKER(_marker);
313 glDeleteTextures(1, &marker->tex);
315 cairo_surface_t *surface = cairo_get_target(marker->cairo);
316 cairo_surface_destroy(surface);
317 cairo_destroy(marker->cairo);
319 g_free(marker->label);
322 static void grits_marker_class_init(GritsMarkerClass *klass)
324 g_debug("GritsMarker: class_init");
325 GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
326 gobject_class->finalize = grits_marker_finalize;
328 GritsObjectClass *object_class = GRITS_OBJECT_CLASS(klass);
329 object_class->draw = grits_marker_draw;