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_source_rgba(marker->cairo, 0, 0, 0, 1);
43 cairo_set_line_width(marker->cairo, marker->outline*2);
45 cairo_arc(marker->cairo, marker->xoff, marker->yoff, marker->radius,
47 cairo_stroke(marker->cairo);
50 cairo_set_source_rgba(marker->cairo, 1, 1, 1, 1);
52 cairo_arc(marker->cairo, marker->xoff, marker->yoff, marker->radius,
54 cairo_fill(marker->cairo);
57 static void render_label(GritsMarker *marker)
59 g_assert(marker->label);
61 cairo_set_source_rgba(marker->cairo, 0, 0, 0, 1);
62 cairo_select_font_face(marker->cairo, "sans-serif",
63 CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
64 cairo_set_font_size(marker->cairo, 13);
65 cairo_move_to(marker->cairo, marker->xoff + (marker->icon_width / 2),
66 marker->yoff - (marker->icon_height / 2));
67 cairo_text_path(marker->cairo, marker->label);
68 cairo_stroke(marker->cairo);
71 cairo_set_source_rgba(marker->cairo, 1, 1, 1, 1);
72 cairo_move_to(marker->cairo, marker->xoff + (marker->icon_width / 2),
73 marker->yoff - (marker->icon_height / 2));
74 cairo_show_text(marker->cairo, marker->label);
77 static void render_icon(GritsMarker *marker)
79 g_assert(marker->icon_img != NULL);
81 /* move to marker location */
82 cairo_translate(marker->cairo, marker->xoff, marker->yoff);
85 cairo_translate(marker->cairo, -marker->icon_width/2,
86 -marker->icon_height/2);
88 cairo_set_source_surface(marker->cairo, marker->icon_img, 0, 0);
90 cairo_paint(marker->cairo);
93 static void render_all(GritsMarker *marker)
96 if (marker->display_mask & GRITS_MARKER_DMASK_ICON)
99 if (marker->display_mask & GRITS_MARKER_DMASK_POINT)
100 render_point(marker);
102 if (marker->display_mask & GRITS_MARKER_DMASK_LABEL)
103 render_label(marker);
105 /* Load GL texture */
106 glEnable(GL_TEXTURE_2D);
107 glGenTextures(1, &marker->tex);
108 glBindTexture(GL_TEXTURE_2D, marker->tex);
109 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
110 glPixelStorei(GL_PACK_ALIGNMENT, 1);
111 glTexImage2D(GL_TEXTURE_2D, 0, 4, marker->width, marker->height,
112 0, GL_BGRA, GL_UNSIGNED_BYTE,
113 cairo_image_surface_get_data(cairo_get_target(marker->cairo)));
114 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
115 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
122 * @label: a short description of the marker
124 * Create a new GritsMarker which shows the given label when drawn.
126 * Returns: the new #GritsMarker.
128 GritsMarker *grits_marker_new(const gchar *label)
130 GritsMarker *marker = g_object_new(GRITS_TYPE_MARKER, NULL);
132 marker->display_mask = GRITS_MARKER_DMASK_POINT |
133 GRITS_MARKER_DMASK_LABEL;
135 //g_debug("GritsMarker: new - %s", label);
136 /* specify size of point and size of surface */
141 marker->icon_width = marker->radius * 2;
142 marker->icon_height = marker->radius * 3;
144 marker->xoff = marker->radius+marker->outline;
145 marker->yoff = marker->height-(marker->radius+marker->outline);
146 marker->cairo = cairo_create(cairo_image_surface_create(
147 CAIRO_FORMAT_ARGB32, marker->width, marker->height));
149 marker->label = g_strdup(label);
155 * grits_marker_icon_new:
156 * @label: The label to display if GRITS_MARKER_DMASK_LABEL is set
157 * @filename: The filename of the icon
158 * @angle: The angle to rotate the icon (0 is north)
159 * @flip: Whether to flip the image so that it's never upside down.
160 * Useful for non-symmetric icons which have an "up".
161 * @display_mask: A bitmask which specifies which items to display.
163 * Create a new marker with a label, point, icon (png), or any
164 * combination of the above.
166 * Returns: the new #GritsMarker
168 GritsMarker *grits_marker_icon_new(const gchar *label, const gchar *filename,
169 guint angle, gboolean flip, guint display_mask)
171 GritsMarker *marker = g_object_new(GRITS_TYPE_MARKER, NULL);
173 marker->label = g_strdup(label);
174 marker->angle = angle;
176 marker->display_mask = display_mask;
178 if (display_mask & GRITS_MARKER_DMASK_ICON) {
179 g_assert(filename != NULL);
180 g_debug("GritsMarker: marker_icon_new - marker image %s",
182 marker->icon_img = cairo_image_surface_create_from_png(filename);
183 if (cairo_surface_status(marker->icon_img)) {
184 g_warning("GritsMarker: marker_icon_new - "
185 "error reading file %s", filename);
186 /* convert it to a point, better than nothing */
187 marker->display_mask &= ~GRITS_MARKER_DMASK_ICON;
188 marker->display_mask |= GRITS_MARKER_DMASK_POINT;
189 marker->icon_width = 4;
190 marker->icon_height = 8;
194 cairo_image_surface_get_width(marker->icon_img);
195 marker->icon_height =
196 cairo_image_surface_get_height(marker->icon_img);
199 marker->icon_img = NULL;
200 marker->icon_width = 4; /* room for the point if there is one */
201 marker->icon_height = 8;
203 g_debug("GritsMarker: marker_icon_new - width = %d, height = %d",
204 marker->icon_width, marker->icon_height);
209 /* this is the surface size, a guess really */
210 marker->width = marker->icon_width + 128;
211 marker->height = marker->icon_height + 64;
213 marker->xoff = marker->width/2;
214 marker->yoff = marker->height/2;
215 marker->cairo = cairo_create(cairo_image_surface_create(
216 CAIRO_FORMAT_ARGB32, marker->width, marker->height));
218 /* clear the surface just in case */
219 cairo_set_operator(marker->cairo, CAIRO_OPERATOR_SOURCE);
220 //cairo_set_source_rgba(marker->cairo, 1.0, 0.0, 0.0, 0.3); // debug
221 cairo_set_source_rgba(marker->cairo, 1.0, 0.0, 0.0, 0.0);
222 cairo_paint(marker->cairo);
223 cairo_set_operator(marker->cairo, CAIRO_OPERATOR_OVER);
227 if (marker->icon_img)
228 cairo_surface_destroy(marker->icon_img);
235 static void grits_marker_draw(GritsObject *_marker, GritsOpenGL *opengl)
237 GritsMarker *marker = GRITS_MARKER(_marker);
238 GritsPoint *point = grits_object_center(marker);
240 cairo_surface_t *surface = cairo_get_target(marker->cairo);
241 gdouble width = cairo_image_surface_get_width(surface);
242 gdouble height = cairo_image_surface_get_height(surface);
249 grits_viewer_project(GRITS_VIEWER(opengl),
250 point->lat, point->lon, point->elev,
253 gint win_width = GTK_WIDGET(opengl)->allocation.width;
254 gint win_height = GTK_WIDGET(opengl)->allocation.height;
258 glMatrixMode(GL_PROJECTION); glLoadIdentity();
259 glMatrixMode(GL_MODELVIEW); glLoadIdentity();
260 glOrtho(0, win_width, win_height, 0, 1, -1);
261 glTranslated(px, win_height-py, 0);
262 glRotatef(marker->angle, 0, 0, -1);
263 glTranslated(-marker->xoff, -marker->yoff, 0);
265 gdouble scale, eye[3], pos[3] =
266 {point->lat, point->lon, point->elev};
267 grits_viewer_get_location(GRITS_VIEWER(opengl),
268 &eye[0], &eye[1], &eye[2]);
269 lle2xyz(eye[0], eye[1], eye[2],
270 &eye[0], &eye[1], &eye[2]);
271 lle2xyz(pos[0], pos[1], pos[2],
272 &pos[0], &pos[1], &pos[2]);
273 scale = MPPX(distd(eye, pos));
275 glRotatef(marker->angle, 0, 0, -1);
276 glRotatef(180, 1, 0, 0);
277 glScalef(scale, scale, 1);
278 glTranslated(-marker->xoff, -marker->yoff, 0);
281 //g_debug("GritsOpenGL: draw_marker - %s pz=%f ", marker->label, pz);
283 glDisable(GL_LIGHTING);
284 glDisable(GL_COLOR_MATERIAL);
285 glDisable(GL_DEPTH_TEST);
286 glEnable(GL_TEXTURE_2D);
287 glBindTexture(GL_TEXTURE_2D, marker->tex);
288 glDisable(GL_CULL_FACE);
290 glTexCoord2f(1, 0); glVertex3f(width, 0 , 0); // 0 - 3 0
291 glTexCoord2f(1, 1); glVertex3f(width, height, 0); // 1 - | |
292 glTexCoord2f(0, 1); glVertex3f(0 , height, 0); // 2 - | |
293 glTexCoord2f(0, 0); glVertex3f(0 , 0 , 0); // 3 - 2----1
299 G_DEFINE_TYPE(GritsMarker, grits_marker, GRITS_TYPE_OBJECT);
300 static void grits_marker_init(GritsMarker *marker)
302 marker->ortho = TRUE;
305 static void grits_marker_finalize(GObject *_marker)
307 //g_debug("GritsMarker: finalize - %s", marker->label);
308 GritsMarker *marker = GRITS_MARKER(_marker);
310 glDeleteTextures(1, &marker->tex);
312 cairo_surface_t *surface = cairo_get_target(marker->cairo);
313 cairo_surface_destroy(surface);
314 cairo_destroy(marker->cairo);
316 g_free(marker->label);
319 static void grits_marker_class_init(GritsMarkerClass *klass)
321 g_debug("GritsMarker: class_init");
322 GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
323 gobject_class->finalize = grits_marker_finalize;
325 GritsObjectClass *object_class = GRITS_OBJECT_CLASS(klass);
326 object_class->draw = grits_marker_draw;