+ private void clearCanvas() {
+ renderingContext.graphics.setColor(backgroundColor);
+ renderingContext.graphics.fillRect(0, 0, getWidth(), getHeight());
+ }
+
+ private boolean isNewRenderingContextNeeded() {
+ return (renderingContext == null)
+ || (renderingContext.width != getWidth())
+ || (renderingContext.height != getHeight());
+ }
+