【转】OpenGL鼠标点击事件

#include <windows.h>    // Windows的头文件

#include <gl\gl.h>        // OpenGL32库的头文件

#include <gl\glu.h>        // GLu32库的头文件

#include <gl\glaux.h>    // GLaux库的头文件

#include <gl\glut.h>    // Glut库头文件

#pragma comment( lib, "opengl32.lib")    // OpenGL32连接库

#pragma comment( lib, "glu32.lib")        // GLu32连接库

#pragma comment( lib, "glaux.lib")        // GLaux连接库

#pragma comment( lib, "glut.lib")        // Glut链接库

int screenWidth=640;

int screenHeight=480;

void myInit()

{

    glClearColor(1.0,1.0,1.0,0.0);            //设置背景颜色为亮白

    glColor3f(0.0f,0.0f,0.0f);                //设置绘图颜色为黑色

    glPointSize(4.0);                        //设置点的大小为4*4像素

    glMatrixMode(GL_PROJECTION);            //设置合适的矩阵

    glLoadIdentity();                       

    gluOrtho2D(0.0,screenWidth,0.0,screenHeight);

}

void drawDot(int x,int y)

{

     glBegin(GL_POINTS);

        glVertex2i(x,y);                    //画一些点

    glEnd();

}

void myMouse(int button,int state,int x,int y)

{

    if(state==GLUT_DOWN)

    {

        if(button==GLUT_LEFT_BUTTON)

        {

            drawDot(x,screenHeight-y);

            glFlush();

        }

        else if(button==GLUT_RIGHT_BUTTON)

        {

            glClearColor(1.0f,0.0f,0.0f,0.0f);

            glClear(GL_COLOR_BUFFER_BIT);

            glFlush();

       

        }   

   

    }

    return;

}

void myDisplay()

{

    glClear(GL_COLOR_BUFFER_BIT);            //清屏

    glBegin(GL_POINTS);

        glVertex2i(100,50);                    //画一些点

        glVertex2i(100,130);

        glVertex2i(150,130);

        glVertex2i(320,240);

    glEnd();

    glFlush();                                //送所有输出到显示设备

}

void main(int argc, char **argv)

{

    glutInit(&argc,argv);                        //初始化工具包   

    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);//设置显示模式

    glutInitWindowSize(640,480);                //设置窗口大小

    glutInitWindowPosition(100,150);            //设置窗口在屏幕上的位置

    glutCreateWindow("my first attempt");        //打开屏幕窗口

    //注册回调函数

    glutDisplayFunc(myDisplay);

    glutMouseFunc(myMouse);

    myInit();

    glutMainLoop();                                //进入循环

}