/**
* Causes this SurfaceObject to draw a representation of itself suitable for use during picking.
*
* @param dc the current DrawContext.
*/
protected void drawPickRepresentation(DrawContext dc)
{
// The pick representation is stored as a list of surface tiles. If the list is empty, then this surface object
// was not picked. This method might be called when the list is null or empty because of an upstream
// exception that prevented creation of the list.
if (this.pickTileBuilder == null || this.pickTileBuilder.getTileCount(dc) == 0)
{
return;
}
// Draw the pickable representation of this surface object created during preRendering.
GL2 gl = dc.getGL().getGL2(); // GL initialization checks for GL2 compatibility.
OGLStackHandler ogsh = new OGLStackHandler();
ogsh.pushAttrib(gl, GL2.GL_POLYGON_BIT); // For cull face enable, cull face, polygon mode.
try
{
gl.glEnable(GL.GL_CULL_FACE);
gl.glCullFace(GL.GL_BACK);
gl.glPolygonMode(GL2.GL_FRONT, GL2.GL_FILL);
dc.getGeographicSurfaceTileRenderer().renderTiles(dc, this.pickTileBuilder.getTiles(dc));
}
finally
{
ogsh.pop(gl);
// Clear the list of pick tiles to avoid retaining references to them in case we're never picked again.
this.pickTileBuilder.clearTiles(dc);
}
}
