/**
* SECTION:gis-object
- * @short_description: Base classes for drawing operations
+ * @short_description: Base class for drawing operations
*
* Objects in libgis are things which can be added to the viewer and will be
* displayed to the user. Each object has information such as it's location and
*/
#include <config.h>
+#include <math.h>
+#include <GL/gl.h>
+
#include "gis-object.h"
-/************
- * GisPoint *
- ************/
+
+/*************
+ * GisObject *
+ *************/
/**
- * gis_point_new:
+ * gis_object_draw:
+ * @object: the object
+ * @opengl: the viewer the object is being displayed in
*
- * Create a new #GisPoint
+ * Perform any OpenGL commands necessasairy to draw the object.
*
- * Returns: the new point
+ * The GL_PROJECTION and GL_MODELVIEW matricies and GL_ALL_ATTRIB_BITS will be
+ * restored to the default state after the call to draw.
*/
-GisPoint *gis_point_new()
+void gis_object_draw(GisObject *object, GisOpenGL *opengl)
{
- return g_new0(GisPoint, 1);
-}
+ GisObjectClass *klass = GIS_OBJECT_GET_CLASS(object);
+ if (!klass->draw) {
+ g_warning("GisObject: draw - Unimplemented");
+ return;
+ }
-/**
- * gis_point_set_lle:
- * @point: the point to modify
- * @lat: the new latitude
- * @lon: the new longitude
- * @elev: the new elevation
- *
- * Set the latitude, longitude, and elevation for a point.
- */
-void gis_point_set_lle(GisPoint *point, gdouble lat, gdouble lon, gdouble elev)
-{
- point->lat = lat;
- point->lon = lon;
- point->elev = elev;
-}
+ /* Skip hidden objects */
+ if (object->hidden)
+ return;
-/**
- * gis_point_free:
- * @point: The point to free
- *
- * Free data used by a #GisPoint
- */
-void gis_point_free(GisPoint *point)
-{
- g_free(point);
-}
+ /* Skip out of range objects */
+ if (object->lod > 0) {
+ /* LOD test */
+ gdouble eye[3], obj[3];
+ gis_viewer_get_location(GIS_VIEWER(opengl), &eye[0], &eye[1], &eye[2]);
+ gdouble elev = eye[2];
+ lle2xyz(eye[0], eye[1], eye[2], &eye[0], &eye[1], &eye[2]);
+ lle2xyz(object->center.lat, object->center.lon, object->center.elev,
+ &obj[0], &obj[1], &obj[2]);
+ gdouble dist = distd(obj, eye);
+ if (object->lod < dist)
+ return;
+ /* Horizon testing */
+ gdouble c = EARTH_R+elev;
+ gdouble a = EARTH_R;
+ gdouble horizon = sqrt(c*c - a*a);
+ if (dist > horizon)
+ return;
+ }
+
+ /* Save state, draw, restore state */
+ g_mutex_lock(opengl->sphere_lock);
+ glPushAttrib(GL_ALL_ATTRIB_BITS);
+ glMatrixMode(GL_PROJECTION); glPushMatrix();
+ glMatrixMode(GL_MODELVIEW); glPushMatrix();
+
+ klass->draw(object, opengl);
+
+ glPopAttrib();
+ glMatrixMode(GL_PROJECTION); glPopMatrix();
+ glMatrixMode(GL_MODELVIEW); glPopMatrix();
+ g_mutex_unlock(opengl->sphere_lock);
+}
-/*************
- * GisObject *
- *************/
/* GObject stuff */
G_DEFINE_ABSTRACT_TYPE(GisObject, gis_object, G_TYPE_OBJECT);
static void gis_object_init(GisObject *object)