Closed polygon shadow filled openGL
4.0
Application background First enter the polygon points, and then in the pop-up window, click the left mouse button, each time a left button, it shows the point, and in the original window to record the coordinates of the point. When the point to a corresponding number, then enter the shadow of the slope inclination, spacing in the original window, pop-up window will automatically draw closed polygon and automatically fill. In the pop-up window, click the right mouse button to refresh.This algorithm is similar to the scan line filling algorithm.