当用户连续快速地按住并释放左(主)鼠标按钮两次时发生。
Occurs when the user presses and releases the left (primary) mouse button twice in quick succession.
画一个测量线，单击新行按钮，然后单击并拖动在主图像窗口用鼠标左键将开始和结束点的线。
To draw a measurement line, click the New line button and then click and drag in the main image window with the left mouse button to place the start and end points of the line.
创建新的追踪点，点击创建按钮然后点击在主图像窗口用鼠标左键放置一个新的追踪位置。
To create new trackers, click the create button and then click in the main image window with the left mouse button to place a new tracker.
创建新的追踪点，点击创建按钮然后点击在主图像窗口用鼠标左键放置一个新的追踪位置。
To create new trackers, click the create button and then click in the main image window with the left mouse button to place a new tracker.
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