/**
* <summary>Removes a polygon from the level.</summary>
* <param name="polygon">Polygon to remove from the level.</param>
*/
public void RemovePolygon( LevelPolygon polygon )
{
if( ! polygons.Contains( polygon ) ) return;
polygons.Remove( polygon );
polygon.StopListeningToTextureList( textureList );
for( int i = 0 ; i < polygon.VertexCount ; ++i )
{
LevelVertex v = polygon.GetVertex( i );
bool usedElsewhere = false;
foreach( LevelPolygon p in polygons )
{
if( p.ContainsVertex( v ) ) {
usedElsewhere = true;
break;
}
}
if( !usedElsewhere ) vertices.Remove( v );
}
}
/**
* <summary>Adds a polygon to the level's set of total polygons if the polygon is not already
* a part of the level.</summary>
* <param name="polygon">Polygon to add to the level.</param>
*/
public void AddPolygon( LevelPolygon polygon )
{
if( polygons.Contains( polygon ) ) return;
polygons.Add( polygon );
polygon.ListenToTextureList( textureList );
for( int i = 0 ; i < polygon.VertexCount ; ++i ) {
AddVertex( polygon.GetVertex( i ) );
}
}