1 #include "stdafx.h" 2 #include <GL/glut.h> 3 #include <stdlib.h> 4 #include <math.h> 5 #include <stdio.h> 6  7 using namespace std; 8  9 10 void myDisplay(void){ 11     glClear(GL_COLOR_BUFFER_BIT);   12     //glRectf(-0.5f, -0.5f, 0.5f, 0.5f);     13     14     glBegin(GL_LINES);     15     glVertex2f(-0.5f, -0.5f);        //直线起始坐标 16     glVertex2f(0.5f, 0.5f);         //直线结束坐标17     glEnd();18 19     glBegin(GL_LINES);20     glVertex2f(-0.5f, 0.5f);21     glVertex2f(0.5f, -0.5f);22     glEnd();23 24     glBegin(GL_LINES);25     glVertex2f(-0.5f, 0.5f);26     glVertex2f(-0.5f, -0.5f);27     glEnd();28 29     glBegin(GL_LINES);30     glVertex2f(0.5f, 0.5f);31     glVertex2f(0.5f, -0.5f);32     glEnd();33 34     glBegin(GL_LINES);35     glVertex2f(-0.5f, 0.5f);36     glVertex2f(0.5f, 0.5f);37     glEnd();38 39     glBegin(GL_LINES);40     glVertex2f(-0.5f, -0.5f);41     glVertex2f(-0.5f, 0.5f);42     glEnd();43 44     glBegin(GL_LINES);45     glVertex2f(0, 0.5f);46     glVertex2f(0, -0.5f);47     glEnd();48 49     glBegin(GL_LINES);50     glVertex2f(-0.5f, -0.5f);51     glVertex2f(0.5, -0.5f);52     glEnd();53 54     glBegin(GL_LINES);55     glVertex2f(-0.5f, 0);56     glVertex2f(0.5, 0);57     glEnd();58 59     glFlush();60 }61 int main(int argc, char *argv[]) { 62     glutInit(&argc, argv);  63     glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);     64     glutInitWindowPosition(100, 100);     65     glutInitWindowSize(500, 500);     66     glutCreateWindow("第一个 OpenGL 程序");     67     glutDisplayFunc(&myDisplay);     68     glutMainLoop();     69     return 0; 70 }