在按钮的控制下，通过鼠标拖动来画直线和圆，轻松自如。
Under the control of the button, through the mouse to draw a line and round, easily.
一个通过鼠标的拖动直线来调节参数的程序。
Drag a straight line through the mouse to adjust the parameters of the procedure.
通过点击和拖动使用鼠标左键，处理网格的小部件可以移动、旋转和缩放，为了测试直线在图像一直不失真。
By clicking and dragging with the left mouse button, the handles of the grid widget can be translated, rotated and scaled, in order to test how well straight lines in the image have been undistorted.
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