点画线

#include<GL/glut.h>


#define drawOneLine(x1,y1,x2,y2) glBegin(GL_LINES);\
        glVertex2f((x1),(y1)); glVertex2f((x2),(y2)); glEnd()

void init()
{
  glClearColor(0.0, 0.0, 0.0, 0.0);
  glShadeModel(GL_FLAT);
}

void display(void)
{
    int i;
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(1.0, 1.0, 1.0);
    glEnable(GL_LINE_STIPPLE);//启用点画功能
    glLineStipple(1, 0x0011); //定义点画模式
    drawOneLine(50.0, 125.0, 50.0,200.0);
    glLineStipple(1, 0x00FF);
    drawOneLine(150.0, 125.0, 250.0, 125.0);
    glLineStipple(1, 0x1C47);
    drawOneLine(250.0, 250.0, 350.0, 125.0);

    glLineWidth(1.0);
    glLineStipple(1, 0x0011);
    drawOneLine(50.0, 125.0, 110.0,125.0);
    glLineStipple(1, 0x00FF);
    drawOneLine(150.0, 125.0, 250.0, 125.0);
    glLineStipple(1, 0x1C47);
    drawOneLine(250.0, 250.0, 350.0, 125.0);
    glLineWidth(1.0);

    glLineStipple(1, 0x0001);
    glBegin(GL_LINE_STRIP);
      for(i = 0; i < 7; i++)
         glVertex2f(50.0 + ((GLfloat) i * 50.0), 75.0);
     glEnd();

     for(i = 0; i < 6; i++)
         drawOneLine(50.0 + (GLfloat)i * 50.0, 50.0, 50.0 + (GLfloat)(i + 1) * 50.0, 50.0);

     glLineStipple(5, 0x1C47);
     drawOneLine(50.0, 25.0, 350.0, 25.0);

     glDisable(GL_LINE_STIPPLE);
     glFlush();
}

void reshape(int w, int h)
{
    glViewport(0, 0, (GLsizei)w, (GLsizei)h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0.0, (GLdouble)w, 0.0, (GLdouble)h);
}

int main(int argc, char **argv)
{
 glutInit(&argc,argv);
 glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
 glutInitWindowSize(400, 400);
 glutInitWindowPosition(100, 100);
 glutCreateWindow(argv[0]);
 init();
 glutDisplayFunc(display);
 glutReshapeFunc(reshape);
 glutMainLoop();

 return 0;
 return 0;  
}