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.
通过点击直线按钮中的一个去添加一条直线，然后利用你的鼠标在你的图像中画出直线。
Add a line by clicking one of the line buttons, and then use your mouse to draw the line on your plot.
根据程序的状态，鼠标按下事件，应该开始绘制一条直线，或者选中一个对象。
Depending on the state of the program, a mouse down might start drawing a line, or it might select an object.
确保选中默认的渐变（黑和白），用鼠标拖动一条从左到右的直线。
Make sure that you have the default palette selected (black and white )and with your mouse drag a similar line. From left to the right.
确保选中默认的渐变（黑和白），用鼠标拖动一条从左到右的直线。
Make sure that you have the default palette selected (black and white )and with your mouse drag a similar line. From left to the right.
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