I set up the mouse click event mouse down and mouse up events mouse click point painted on the canvas, and then through the mouse down and mouse up event connect has draw between the two points on a straight line, operation, at the time of two points of attachment will appear a third point, should be also triggered the mouse click is not how to set the trigger

CodePudding user response:

Empty the mouse click, only set down, up, down to the starting point, form a line up, press the Windows Settings, first down, then up, and then click again,