OpenGL鼠标点击事件

我就是我 2022-03-29 04:56 302阅读 0赞

#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
    }