openGL画直线、圆、椭圆(共6页).doc

使用openGl画直线（DDA算法）、画圆、椭圆（Bresenham算法）#include#include #include /* initialization: */ void myinit(void) /* attributes */ glClearColor(1.0, 1.0, 1.0, 0.0); /* white background */ glColor3f(1.0, 0.0, 0.0); /* draw in red */ /* set up viewing: */ /* 500 x 500 window with origin lower left */ glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0.0, 500.0, 0.0, 500.0