在一个窗口中分为4个小窗口，每个窗口中显示直线、三角、填充颜色的三角、填充颜色的圆；点击鼠标，当前小窗口覆盖整个窗口，图像可移动可缩放-In a window divided into 4 small windows, each window display line, triangle, triangle fill color, fill color of the circle　click of the mouse, the current small window cover the entire window, the image can move scalable