OpenGL用法暨第一个OpenGL程序

//OpenGL的书写规范 暨我的第一个OpenGL程序

//有了框架，其他就什么都好说了

#include "..\H\glut.h"

#pragma comment(lib, "glut.lib")

void init(void)

{

glClearColor(1.0, 1.0, 0.0, 0.0);//设置主窗口的背景颜色

glColor3f(1.0f,0.0f,0.0f);  // 设置所绘图形的颜色

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

gluOrtho2D(0.0,640.0,0.0,480.0);

}

void myDisplay(void)

{

glClear(GL_COLOR_BUFFER_BIT);// 将缓存清除为预先的设置值

/*------------------------------------------------------------------------*/

//此处添加需要绘制的图形

glBegin(GL_POLYGON);

glVertex3f(200.0,200.0,0.0);

glVertex3f(200.0,300.0,0.0);

glVertex3f(300.0,300.0,0.0);

glVertex3f(300.0,200.0,0.0);

glEnd();

//

glBegin(GL_POINTS);

glVertex2i(60,60);

glVertex2i(80,80);

glVertex2i(30,50);

glEnd();

//

glBegin(GL_POINTS);

for(int i=50;i<400;i=i+10)

glVertex2i(i,50);

glEnd();

//

glBegin(GL_LINES);//两条线段

glVertex2i(85,80);

glVertex2i(100,100);

glVertex2i(110,90);

glVertex2i(130,150);

glVertex2i(100,205);//不会画出

glEnd();

//

glBegin(GL_LINE_STRIP);//依次链接的折现

glVertex2i(200,100);

glVertex2i(290,180);

glVertex2i(250,90);

glVertex2i(230,150);

glVertex2i(270,200);

glEnd();

//

glColor3f(0.0f,0.0f,1.0f);// 下方颜色

glBegin(GL_LINE_LOOP);//依次链接 直至 封闭

glVertex2i(250,300);

glVertex2i(300,280);

glVertex2i(190,300);

glVertex2i(330,330);

glVertex2i(300,350);

glEnd();

/*------------------------------------------------------------------------*/

glFlush();//强制OpenGL函数在有限时间内运行

}

int main(int argc, char ** argv)

{

glutInit(&argc, argv);//初始化GLUT库

glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB|GLUT_DEPTH | GLUT_SINGLE | GLUT_RGBA);//单缓冲、RGB模式|其他模式

glutInitWindowSize(500,500);//窗口尺寸大小

glutInitWindowPosition(200, 200);//距离屏幕边框距离

glutCreateWindow("OpenGL_Window");//窗口标题

init();

glutDisplayFunc(myDisplay);//显示需要绘制的图形

glutMainLoop();//循环

return 0;

}