和拖动一样，元键在这里也可以用来约束调整尺寸操作的方向。
As with dragging, a meta-key is often used to constrain the direction of a resize interaction.
拖动此形状，可添加一条大小和方向可调的弧线。可以显示互补弧线。
Drag to add an arc with adjustable size and orientation. Complementary arc can be shown.
本研究探讨GUI环境中目标的方向、大小和距离对鼠标指点定位和拖动操作的影响。
The study examined the effect of the target direction, size and distance on the mouse operation of pointing and dragging in a GUI environment.
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