OpenGL演示程序。

1创建一个窗口，窗口分成四块。第一块绘制线（虚线、实线、粗线），第二块绘制多边形，第三块窗口用渐变填充多边形，第四块窗口绘制圆。

2右击每一块，则单独显示该块的内容。单独显示时，可以使用鼠标左键对显示内容进行拖动，用滚轮进行缩放。再次右击则显示四块的内容。-OpenGL demo. 1 to create a window, the window is divided into four. The first one to draw a line (dashed, solid, thick line), the second block of drawing polygons, the third block window polygon with a gradient fill, the fourth round draw block window. 2 Right-click each one, then a separate display the contents of the block. Solo show, you can use the left mouse button to drag on the display, zoom with scroll wheel. Right-click again, the content is displayed 4.