Expand the rectangle.
CL_Rectx<float >& CL_Rectx< float >::expand( const float & left, const float & top, const float & right, const float & bottom); CL_Rectx<float >& CL_Rectx< float >::expand( const float & left_and_right, const float & top_and_bottom); CL_Rectx<float >& CL_Rectx< float >::expand( const float & expand);