* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+/**
+ * SECTION:gis-marker
+ * @short_description: Single point markers
+ *
+ * Each #GisMarker represents some point on the earth with some form of
+ * content. Commonly this is used to mark geographic features such as cities or
+ * states.
+ *
+ * While markers represent a place in three dimensions somewhere on, below, or
+ * above the surface of the earth, they are drawn in 2 dimensions so that they
+ * look normal and readable by the user. Due to this, GisObjects should almost
+ * always be added to the GIS_LEVEL_OVERLAY level so they are drawn "above" the
+ * actual earth.
+ */
+
#include <config.h>
+#include <GL/gl.h>
#include "gis-marker.h"
-/* GisMarker */
-G_DEFINE_TYPE(GisMarker, gis_marker, GIS_TYPE_OBJECT);
-static void gis_marker_init(GisMarker *self) { }
+/**
+ * gis_marker_new:
+ * @label: a short description of the marker
+ *
+ * Create a new GisMarker which shows the given label when drawn.
+ *
+ * Returns: the new #GisMarker.
+ */
+GisMarker *gis_marker_new(const gchar *label)
+{
+ //g_debug("GisMarker: new - %s", label);
+ static const gdouble OUTLINE = 2;
+ static const gdouble RADIUS = 3;
+ static const gdouble WIDTH = 128;
+ static const gdouble HEIGHT = 32;
-static void gis_marker_finalize(GObject *_self);
-static void gis_marker_class_init(GisMarkerClass *klass)
+ GisMarker *marker = g_object_new(GIS_TYPE_MARKER, NULL);
+ marker->xoff = RADIUS+OUTLINE;
+ marker->yoff = HEIGHT-(RADIUS+OUTLINE);
+ marker->label = g_strdup(label);
+ marker->cairo = cairo_create(cairo_image_surface_create(
+ CAIRO_FORMAT_ARGB32, WIDTH, HEIGHT));
+
+ cairo_select_font_face(marker->cairo, "sans-serif",
+ CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
+ cairo_set_font_size(marker->cairo, 13);
+
+ /* Draw outline */
+ cairo_set_source_rgba(marker->cairo, 0, 0, 0, 1);
+ cairo_set_line_width(marker->cairo, OUTLINE*2);
+
+ cairo_arc(marker->cairo, marker->xoff, marker->yoff, RADIUS, 0, 2*G_PI);
+ cairo_stroke(marker->cairo);
+
+ cairo_move_to(marker->cairo, marker->xoff+4, marker->yoff-8);
+ cairo_text_path(marker->cairo, marker->label);
+ cairo_stroke(marker->cairo);
+
+ /* Draw filler */
+ cairo_set_source_rgba(marker->cairo, 1, 1, 1, 1);
+
+ cairo_arc(marker->cairo, marker->xoff, marker->yoff, RADIUS, 0, 2*G_PI);
+ cairo_fill(marker->cairo);
+
+ cairo_move_to(marker->cairo, marker->xoff+4, marker->yoff-8);
+ cairo_show_text(marker->cairo, marker->label);
+
+ /* Load GL texture */
+ glEnable(GL_TEXTURE_2D);
+ glGenTextures(1, &marker->tex);
+ glBindTexture(GL_TEXTURE_2D, marker->tex);
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+ glPixelStorei(GL_PACK_ALIGNMENT, 1);
+ glTexImage2D(GL_TEXTURE_2D, 0, 4, WIDTH, HEIGHT, 0, GL_RGBA, GL_UNSIGNED_BYTE,
+ cairo_image_surface_get_data(cairo_get_target(marker->cairo)));
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+ return marker;
+}
+
+/* Drawing */
+static void gis_marker_draw(GisObject *_marker, GisOpenGL *opengl)
+{
+ GisMarker *marker = GIS_MARKER(_marker);
+ GisPoint *point = gis_object_center(marker);
+ gdouble px, py, pz;
+ gis_viewer_project(GIS_VIEWER(opengl),
+ point->lat, point->lon, point->elev,
+ &px, &py, &pz);
+
+ gint win_width = GTK_WIDGET(opengl)->allocation.width;
+ gint win_height = GTK_WIDGET(opengl)->allocation.height;
+ py = win_height - py;
+ if (pz > 1)
+ return;
+
+ //g_debug("GisOpenGL: draw_marker - %s pz=%f ", marker->label, pz);
+
+ cairo_surface_t *surface = cairo_get_target(marker->cairo);
+ gdouble width = cairo_image_surface_get_width(surface);
+ gdouble height = cairo_image_surface_get_height(surface);
+
+ glMatrixMode(GL_PROJECTION); glLoadIdentity();
+ glMatrixMode(GL_MODELVIEW); glLoadIdentity();
+ glOrtho(0, win_width, win_height, 0, -1, 1);
+ glTranslated(px - marker->xoff,
+ py - marker->yoff, 0);
+
+ glDisable(GL_LIGHTING);
+ glDisable(GL_COLOR_MATERIAL);
+ glDisable(GL_DEPTH_TEST);
+ glEnable(GL_TEXTURE_2D);
+ glBindTexture(GL_TEXTURE_2D, marker->tex);
+ glDisable(GL_CULL_FACE);
+ glBegin(GL_QUADS);
+ glTexCoord2f(1, 0); glVertex3f(width, 0 , 0);
+ glTexCoord2f(1, 1); glVertex3f(width, height, 0);
+ glTexCoord2f(0, 1); glVertex3f(0 , height, 0);
+ glTexCoord2f(0, 0); glVertex3f(0 , 0 , 0);
+ glEnd();
+}
+
+/* GObject code */
+G_DEFINE_TYPE(GisMarker, gis_marker, GIS_TYPE_OBJECT);
+static void gis_marker_init(GisMarker *marker)
{
- G_OBJECT_CLASS(klass)->finalize = gis_marker_finalize;
}
-GisMarker *gis_marker_new(const gchar *label)
+static void gis_marker_finalize(GObject *_marker)
{
- static const int RADIUS = 4;
- static const int WIDTH = 100;
- static const int HEIGHT = 20;
-
- GisMarker *self = g_object_new(GIS_TYPE_MARKER, NULL);
- self->xoff = RADIUS;
- self->yoff = HEIGHT-RADIUS;
- self->label = g_strdup(label);
- self->cairo = cairo_create(cairo_image_surface_create(
- CAIRO_FORMAT_ARGB32, WIDTH, HEIGHT));
- cairo_set_source_rgba(self->cairo, 1, 1, 1, 1);
- cairo_arc(self->cairo, self->xoff, self->yoff, RADIUS, 0, 2*G_PI);
- cairo_fill(self->cairo);
- cairo_move_to(self->cairo, self->xoff+4, self->yoff-8);
- cairo_set_font_size(self->cairo, 10);
- cairo_show_text(self->cairo, self->label);
- return self;
+ //g_debug("GisMarker: finalize - %s", marker->label);
+ GisMarker *marker = GIS_MARKER(_marker);
+ glDeleteTextures(1, &marker->tex);
+ cairo_surface_t *surface = cairo_get_target(marker->cairo);
+ cairo_surface_destroy(surface);
+ cairo_destroy(marker->cairo);
+ g_free(marker->label);
}
-static void gis_marker_finalize(GObject *_self)
+static void gis_marker_class_init(GisMarkerClass *klass)
{
- GisMarker *self = GIS_MARKER(_self);
- cairo_surface_destroy(cairo_get_target(self->cairo));
- cairo_destroy(self->cairo);
- g_free(self->label);
- g_free(self);
+ g_debug("GisMarker: class_init");
+ GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
+ gobject_class->finalize = gis_marker_finalize;
+
+ GisObjectClass *object_class = GIS_OBJECT_CLASS(klass);
+ object_class->draw = gis_marker_draw;
}
projects / grits / blobdiff