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 GRITS_OBJECT(marker)->skip = GRITS_SKIP_CENTER;
134 marker->display_mask = GRITS_MARKER_DMASK_POINT |
135 GRITS_MARKER_DMASK_LABEL;
137 //g_debug("GritsMarker: new - %s", label);
138 /* specify size of point and size of surface */
143 marker->icon_width = marker->radius * 2;
144 marker->icon_height = marker->radius * 3;
146 marker->xoff = marker->radius+marker->outline;
147 marker->yoff = marker->height-(marker->radius+marker->outline);
148 marker->cairo = cairo_create(cairo_image_surface_create(
149 CAIRO_FORMAT_ARGB32, marker->width, marker->height));
151 marker->label = g_strdup(label);
157 * grits_marker_icon_new:
158 * @label: The label to display if GRITS_MARKER_DMASK_LABEL is set
159 * @filename: The filename of the icon
160 * @angle: The angle to rotate the icon (0 is north)
161 * @flip: Whether to flip the image so that it's never upside down.
162 * Useful for non-symmetric icons which have an "up".
163 * @display_mask: A bitmask which specifies which items to display.
165 * Create a new marker with a label, point, icon (png), or any
166 * combination of the above.
168 * Returns: the new #GritsMarker
170 GritsMarker *grits_marker_icon_new(const gchar *label, const gchar *filename,
171 guint angle, gboolean flip, guint display_mask)
173 GritsMarker *marker = g_object_new(GRITS_TYPE_MARKER, NULL);
175 marker->label = g_strdup(label);
176 marker->angle = angle;
178 marker->display_mask = display_mask;
180 if (display_mask & GRITS_MARKER_DMASK_ICON) {
181 g_assert(filename != NULL);
182 g_debug("GritsMarker: marker_icon_new - marker image %s",
184 marker->icon_img = cairo_image_surface_create_from_png(filename);
185 if (cairo_surface_status(marker->icon_img)) {
186 g_warning("GritsMarker: marker_icon_new - "
187 "error reading file %s", filename);
188 /* convert it to a point, better than nothing */
189 marker->display_mask &= ~GRITS_MARKER_DMASK_ICON;
190 marker->display_mask |= GRITS_MARKER_DMASK_POINT;
191 marker->icon_width = 4;
192 marker->icon_height = 8;
196 cairo_image_surface_get_width(marker->icon_img);
197 marker->icon_height =
198 cairo_image_surface_get_height(marker->icon_img);
201 marker->icon_img = NULL;
202 marker->icon_width = 4; /* room for the point if there is one */
203 marker->icon_height = 8;
205 g_debug("GritsMarker: marker_icon_new - width = %d, height = %d",
206 marker->icon_width, marker->icon_height);
211 /* this is the surface size, a guess really */
212 marker->width = marker->icon_width + 128;
213 marker->height = marker->icon_height + 64;
215 marker->xoff = marker->width/2;
216 marker->yoff = marker->height/2;
217 marker->cairo = cairo_create(cairo_image_surface_create(
218 CAIRO_FORMAT_ARGB32, marker->width, marker->height));
220 /* clear the surface just in case */
221 cairo_set_operator(marker->cairo, CAIRO_OPERATOR_SOURCE);
222 //cairo_set_source_rgba(marker->cairo, 1.0, 0.0, 0.0, 0.3); // debug
223 cairo_set_source_rgba(marker->cairo, 1.0, 0.0, 0.0, 0.0);
224 cairo_paint(marker->cairo);
225 cairo_set_operator(marker->cairo, CAIRO_OPERATOR_OVER);
229 if (marker->icon_img)
230 cairo_surface_destroy(marker->icon_img);
237 static void grits_marker_draw(GritsObject *_marker, GritsOpenGL *opengl)
239 GritsMarker *marker = GRITS_MARKER(_marker);
240 GritsPoint *point = grits_object_center(marker);
242 cairo_surface_t *surface = cairo_get_target(marker->cairo);
243 gdouble width = cairo_image_surface_get_width(surface);
244 gdouble height = cairo_image_surface_get_height(surface);
251 grits_viewer_project(GRITS_VIEWER(opengl),
252 point->lat, point->lon, point->elev,
255 gint win_height = GTK_WIDGET(opengl)->allocation.height;
259 glTranslated(px, win_height-py, 0);
260 glRotatef(marker->angle, 0, 0, -1);
261 glTranslated(-marker->xoff, -marker->yoff, 0);
263 gdouble scale, eye[3], pos[3] =
264 {point->lat, point->lon, point->elev};
265 grits_viewer_get_location(GRITS_VIEWER(opengl),
266 &eye[0], &eye[1], &eye[2]);
267 lle2xyz(eye[0], eye[1], eye[2],
268 &eye[0], &eye[1], &eye[2]);
269 lle2xyz(pos[0], pos[1], pos[2],
270 &pos[0], &pos[1], &pos[2]);
271 scale = MPPX(distd(eye, pos));
273 glRotatef(marker->angle, 0, 0, -1);
274 glRotatef(180, 1, 0, 0);
275 glScalef(scale, scale, 1);
276 glTranslated(-marker->xoff, -marker->yoff, 0);
279 //g_debug("GritsOpenGL: draw_marker - %s pz=%f ", marker->label, pz);
281 glDisable(GL_LIGHTING);
282 glDisable(GL_COLOR_MATERIAL);
283 glDisable(GL_DEPTH_TEST);
284 glEnable(GL_TEXTURE_2D);
285 glBindTexture(GL_TEXTURE_2D, marker->tex);
286 glDisable(GL_CULL_FACE);
288 glTexCoord2f(1, 0); glVertex3f(width, 0 , 0); // 0 - 3 0
289 glTexCoord2f(1, 1); glVertex3f(width, height, 0); // 1 - | |
290 glTexCoord2f(0, 1); glVertex3f(0 , height, 0); // 2 - | |
291 glTexCoord2f(0, 0); glVertex3f(0 , 0 , 0); // 3 - 2----1
297 G_DEFINE_TYPE(GritsMarker, grits_marker, GRITS_TYPE_OBJECT);
298 static void grits_marker_init(GritsMarker *marker)
300 marker->ortho = TRUE;
303 static void grits_marker_finalize(GObject *_marker)
305 //g_debug("GritsMarker: finalize - %s", marker->label);
306 GritsMarker *marker = GRITS_MARKER(_marker);
308 glDeleteTextures(1, &marker->tex);
310 cairo_surface_t *surface = cairo_get_target(marker->cairo);
311 cairo_surface_destroy(surface);
312 cairo_destroy(marker->cairo);
314 g_free(marker->label);
317 static void grits_marker_class_init(GritsMarkerClass *klass)
319 g_debug("GritsMarker: class_init");
320 GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
321 gobject_class->finalize = grits_marker_finalize;
323 GritsObjectClass *object_class = GRITS_OBJECT_CLASS(klass);
324 object_class->draw = grits_marker_draw;