在窗口中绘制三角形和四边形两个简单填充图形，并且它们能够被鼠标选中并随鼠标一起拖动，此外能够使用右键菜单分别设置两个简单图形的颜色-Draw two triangles and quads simple filled shapes in a window, and they can be selected together with the mouse and drag the mouse, in addition to use the right-click menu to set the c