OpenGL鼠标旋转图像

﹏ヽ暗。殇╰゛Y 2021-12-19 04:23 455阅读 0赞

![162230193088550.png][]

（鼠标旋转功能）

![ContractedBlock.gif][] ![ExpandedBlockStart.gif][]

#include <iostream>
    using namespace std;
    
    #include<gl/glut.h>
    
    GLfloat transx,transy;
    
    GLfloat scale;
    
    int primw=300;
    int primh=300;
    
    GLfloat rotatex=0,rotatey=0;
    
    GLint mousepx,mousepy;
    
    void rend(void)
    {
        glClear(GL_COLOR_BUFFER_BIT);
        glPointSize(8);
        glLineWidth(2);
        glColor3f(1,0,0);
    
        glPushMatrix();
        glTranslatef(transx,transy,0);
        glRotatef(rotatex,1,0,0);
        glRotatef(rotatey,0,1,0);
        glBegin(GL_LINES);
            glVertex3f(0,0,0);
            glVertex3f(0,2,0);
            glVertex3f(0,0,0);
            glVertex3f(2,0,0);
            glVertex3f(0,0,0);
            glVertex3f(0,0,2);
        glEnd();
        glBegin(GL_LINES);
            glVertex3f(0,0,0);
            glVertex3f(10,6,0);
            glVertex3f(10,10,0);
        glEnd();
        glPopMatrix();
    
            
        glFlush();
    }
    
    void reshape(int w, int h)
    {
        glViewport(0,0,w,h);
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        if(w<=h)
            gluOrtho2D(-10,10,-10.0/w*h,10.0/w*h);
        else
            gluOrtho2D(-10.0/h*w,10.0/h*w,-10,10);
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
        
        if(w<=h)
        {
        /*    scale=(GLfloat)primw/w;*/
            transx=(50-w/2.0)*20.0/w;
            transy=(50-h/2.0)*20.0/w;
        }
        else
        {
    /*        scale=(GLfloat)primh/h;*/
            transx=(50-w/2.0)*20.0/h;
            transy=(50-h/2.0)*20.0/h;
        }
    
    }
    
    void motion(int x, int y)
    {    
        int w,h;
        w=glutGet(GLUT_WINDOW_WIDTH);
        h=glutGet(GLUT_WINDOW_HEIGHT);
    
        if(0<=x && x<=w && 0<=y && y<=h)
        {
            rotatex=(mousepy-y)/(GLfloat)h*360;
            rotatey=(mousepx-x)/(GLfloat)w*360;
    /*        cout<<"rotatex:rotatey"<<rotatex<<" "<<rotatey<<endl;*/
            glutPostRedisplay();
        }
    
    }
    
    void mousedown(int mouse, int state , int x, int y)
    {
        if(state== GLUT_DOWN)
        {
            mousepx=x;
            mousepy=y;
        }
    //     cout<<"mousepx:mousepy"<<endl;
    //     cout<<mousepx<<"  "<<mousepy<<endl;
    }
    
    int main(int argc,char** argv)
    {
        glutInit(&argc,argv);
        glutInitDisplayMode(GLUT_RGB);
        glutInitWindowSize(primw,primh);
        glutCreateWindow("coordination");
    
        glClearColor(1,1,1,0);
        glutDisplayFunc(rend);
        glutMotionFunc(motion);
        glutMouseFunc(mousedown);
        glutReshapeFunc(reshape);
        glutMainLoop();
    
        return 0;
    }

以上代码的使用：

1,、放在控制台应用程序中运行会出现控制台界面（黑框）

2、新建一个Qt工程Qt Application：

![162244415733277.png][]

删除无用的文件（\*.ui等），仅剩下main.cpp即可

![162246400738679.png][]

将代码复制到main.cpp中运行，没有控制台出现。

工程下载地址（注意电脑要配置Qt）：http://pan.baidu.com/s/1gdEeZgZ

转载于:https://www.cnblogs.com/lwngreat/p/4229885.html

[162230193088550.png]: /images/20211218/e0dce6a41673413bb1c6e49c1c951056.png
[ContractedBlock.gif]: https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif
[ExpandedBlockStart.gif]: /images/20211218/397c586860a343d6aea13dd87d62b0a3.png
[162244415733277.png]: /images/20211218/34bb2f72c0444cb7bd35903a14800652.png
[162246400738679.png]: /images/20211218/62b703f0c55d491db9cf155e871c53bd.png