Update the camera's view bounds.

def update_view_bounds(self):
        """Update the camera's view bounds."""
        self.view_bounds.left = self.pan.X - self.world_center.X
        self.view_bounds.top = self.pan.Y - self.world_center.Y
        self.view_bounds.width = self.world_center.X * 2
        self.view_bounds.height = self.world_center.Y * 2