| 摘要 |
For operating an operation target object displayed on a screen using a pointing device, a first input coordinate value indicating a position on the screen designated by the pointing device and a second input coordinate value detected discretely from, and before, the first input coordinate value are detected. A changing direction is calculated based on the first input coordinate value and the second input coordinate value, and a rotation direction is determined based on the changing direction. The operation target object is rotated in the rotation direction.
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