显示窗口和由示例程序生成的线段

#include<GL/glut.h>
void init(void)
{
    glClearColor(1.0,1.0,1.0,0.0);
    glMatrixMode(GL_PROJECTION);
    gluOrtho2D(0.0,200.0,0.0,150.0);
}

void lineSegment(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(1.0,0.0,0.0);
    glBegin (GL_LINES);
        glVertex2i(180,15);
        glVertex2i(10,145);
    glEnd();
    glFlush();
}    
void main(int argc,char**argv)
{
  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
  glutInitWindowPosition(50,100);
  glutInitWindowSize(400,300);
  glutCreateWindow("An Example OpenGL Program");
  init();
  glutDisplayFunc(lineSegment);
  glutMainLoop();

}
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