OpenGL直线点画模式

程序来自《OpenGL编程指南第七版》

 #include "stdafx.h"
 #include <Windows.h>//头文件一定要加上，因为windows版本的gl.h和glu.h文件内部使用的宏是在windows.h中定义的
 #include <gl/GL.h>
 #include <gl/GLU.h>
 #include <gl/glut.h>
 static GLfloat spin=0.0;
 int drawOneLine(float x1,float y1,float x2,float y2)
 {
     glBegin(GL_LINES);
     glVertex2f((x1),(y1));
     glVertex2f((x2),(y2));
     glEnd();
     return ;
 }

 void init (void)
 {
     glClearColor(0.5,0.5,0.5,0.0);
     glShadeModel(GL_FLAT);
 }
 void display(void)
 {
     int i;
     glClear(GL_COLOR_BUFFER_BIT);
     glColor3f(1.0,1.0,0.0);
     glEnable(GL_LINE_STIPPLE);
     glLineStipple(,0x0101);//注意glLineStipple用法以及每个参数的意义
     drawOneLine(50.0,125.0,150.0,125.0);
     glLineStipple(,0x00FF);
     drawOneLine(150.0,125.0,250.0,125.0);
     glLineStipple(,0x1C47);
     drawOneLine(250.0,125.0,350.0,125.0);
     glLineWidth(5.0);
     glLineStipple(,0x0101);
     drawOneLine(50.0,100.0,150.0,100.0);
     glLineStipple(,0x00FF);
     drawOneLine(150.0,100.0,250.0,100.0);
     glLineStipple(,0x1C47);
     drawOneLine(250.0,100.0,350.0,100.0);
     glLineWidth(1.0);
     glLineStipple(,0x1C47);
     glBegin(GL_LINE_STRIP);
         for (i=;i<;i++)
         glVertex2f(50.0+((GLfloat)i+50.0),75.0);
     glEnd();
     for (i=;i<;i++)
         drawOneLine(50.0+((GLfloat)i+50.0),50.0,50.0+((GLfloat)(i+)+50.0),50.0);
     glLineStipple(,0x1C47);
     drawOneLine(50.0,25.0,350.0,25.0);
     glDisable(GL_LINE_STIPPLE);
     glFlush();
 }

 void reshape(int w,int h)
 {
     glViewport(,,(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(,);
     glutInitWindowPosition(,);
     glutCreateWindow(argv[]);
     init();
     glutDisplayFunc(display);
     glutReshapeFunc(reshape);
     glutMainLoop();
     return ;
 }

运行的效果图：