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 en