本示例使用OpenGL创建三维Scattergraph，用户可以从任何角度查看使用鼠标旋转。图形数据可以经正投影或透视投影显示，并可以选择每个点的颜色。用户可以在图形周围绘制点，并选择它们，然后缩放图，以扩大该区域包含选定点。-This sample uses OpenGl to create a 3-D Scattergraph that the user can view from any angle by rotating with the mouse. The data can be shown with either orthographic or perspective projection. The data, and optionally the color of each point, are loaded from a text file. The application can be re-sized in the usual manner, and this re-sizes the graph. The slightly unusual feature is that the user can draw around points in the graph to select them, and then zoom the graph so as to magnify the region containing the selected points.