If you translate a graphics object, you'll usually want to clear the canvas drawing area before you draw the translated object. If you rotate a graphics object, there's no need to clear the canvas drawing area. Why the difference?

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The Answer of If you translate a graphics object, you'll usually want to clear the canvas drawing area before you draw the translated object. If you rotate a graphics object, there's no need to clear the canvas drawing area. Why the difference?

If You Translate a Graphics Object, You'll Usually Want to Clear