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Refreshing the screen can be given as a command too, which may be necessary, if a graphic object “remains” on the screen, the Windows did not refresh that area for any reason.
In the Windows, graphic objects can be displayed in several ways. Gravity uses the mode of composing the picture in memory at its own pace and leaving for the Windows to display it, due to which the motion is relatively steady.
Gravity uses two kinds of refresh. One of them displays again the picture in memory on the screen, called Refresh (soft refresh). The other firstly deletes the full screen to background color, then displays again the picture, called Repaint (hard refresh).
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