2 * Copyright (C) 2009-2010 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/>.
20 * @short_description: Single point markers
22 * Each #GisMarker 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, GisObjects should almost
29 * always be added to the GIS_LEVEL_OVERLAY level so they are drawn "above" the
34 #include "gis-marker.h"
41 * @label: a short description of the marker
43 * Create a new GisMarker which shows the given label when drawn.
45 * Returns: the new #GisMarker.
47 GisMarker *gis_marker_new(const gchar *label)
49 //g_debug("GisMarker: new - %s", label);
50 static const int RADIUS = 4;
51 static const int WIDTH = 100;
52 static const int HEIGHT = 20;
54 GisMarker *marker = g_object_new(GIS_TYPE_MARKER, NULL);
55 marker->xoff = RADIUS;
56 marker->yoff = HEIGHT-RADIUS;
57 marker->label = g_strdup(label);
58 marker->cairo = cairo_create(cairo_image_surface_create(
59 CAIRO_FORMAT_ARGB32, WIDTH, HEIGHT));
60 cairo_set_source_rgba(marker->cairo, 1, 1, 1, 1);
61 cairo_arc(marker->cairo, marker->xoff, marker->yoff, RADIUS, 0, 2*G_PI);
62 cairo_fill(marker->cairo);
63 cairo_move_to(marker->cairo, marker->xoff+4, marker->yoff-8);
64 cairo_set_font_size(marker->cairo, 10);
65 cairo_show_text(marker->cairo, marker->label);
69 G_DEFINE_TYPE(GisMarker, gis_marker, GIS_TYPE_OBJECT);
70 static void gis_marker_init(GisMarker *marker)
74 static void gis_marker_finalize(GObject *_marker)
76 GisMarker *marker = GIS_MARKER(_marker);
77 //g_debug("GisMarker: finalize - %s", marker->label);
78 cairo_surface_t *surface = cairo_get_target(marker->cairo);
79 cairo_surface_destroy(surface);
80 cairo_destroy(marker->cairo);
81 g_free(marker->label);
84 static void gis_marker_class_init(GisMarkerClass *klass)
86 G_OBJECT_CLASS(klass)->finalize = gis_marker_finalize;