#include <GLUT/GLUT.h>
#include <stdio.h>
//我使用的xcode vs下应该include gl.h glu.h
static GLfloat spin = 0.0;
void init(){
glClearColor(0.0, 0.0, 0.0, 0.0);
glShadeModel(GL_FLAT);
}
void display(){
glClear(GL_COLOR_BUFFER_BIT);//清除颜色缓冲 参数还有GL_DEPTH_BUFFER_BIT 表示深度缓冲
glPushMatrix();
glRotatef(spin, 0.0, 0.0, 1.0);
glColor3f(1.0, 1.0, 0.4);
glRectf(-25.0, -25.0, 25.0, 25.0);
glPopMatrix();
glutSwapBuffers();//因为glutInitDisplayMode使用了双缓冲
}
void spinDisplay(){
spin += 2.0;
if (spin > 360.0) {
spin -= 360.0;
}
glutPostRedisplay();
}
void reshape(int w, int v){
glViewport(0, 0, (GLsizei) w, (GLsizei) v);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-50.0, 50.0, 50.0, -50.0, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void mouse(int button, int state, int x, int y){
switch (button) {
case GLUT_LEFT_BUTTON:
if (state == GLUT_DOWN) {
glutIdleFunc(spinDisplay);
}
break;
case GLUT_RIGHT_BUTTON:
if (state == GLUT_DOWN) {
glutIdleFunc(NULL);
}
break;
default:
break;
}
}
int main(int argc, char **argv){
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
glutInitWindowSize(250, 250);
glutInitWindowPosition(100, 100);
glutCreateWindow(argv[0]);
init();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutMouseFunc(mouse);
glutMainLoop();
return 0;
}
关于glMatrixMode 可参考这篇文章 http://blog.csdn.net/jiangdf/article/details/8460012