绘制箭头，像那些用于移动工具。

Draw an arrow like those used by the move tool.

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如果绘制的箭头指向不同的单元格，最终就会形成不同的比对(但是得分都相同)。

Depending on which one you choose to point back to, you will end up with different alignments (but all with the same score).

youdao

用户在有效的目标对象上释放鼠标键后，程序会在两个对象之间绘制一条永久的线或者箭头。

After the user releases the mouse button over a valid target, the program draws a more permanent line or arrow between the two objects.

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