OpenGL鼠标旋转图像

（鼠标旋转功能）

#include <iostream>
using namespace std;

#include<gl/glut.h>

GLfloat transx,transy;

GLfloat scale;

int primw=;
int primh=;

GLfloat rotatex=,rotatey=;

GLint mousepx,mousepy;

void rend(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    glPointSize();
    glLineWidth();
    glColor3f(,,);

    glPushMatrix();
    glTranslatef(transx,transy,);
    glRotatef(rotatex,,,);
    glRotatef(rotatey,,,);
    glBegin(GL_LINES);
        glVertex3f(,,);
        glVertex3f(,,);
        glVertex3f(,,);
        glVertex3f(,,);
        glVertex3f(,,);
        glVertex3f(,,);
    glEnd();
    glBegin(GL_LINES);
        glVertex3f(,,);
        glVertex3f(,,);
        glVertex3f(,,);
    glEnd();
    glPopMatrix();

    glFlush();
}

void reshape(int w, int h)
{
    glViewport(,,w,h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    if(w<=h)
        gluOrtho2D(-,,-10.0/w*h,10.0/w*h);
    else
        gluOrtho2D(-10.0/h*w,10.0/h*w,-,);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    if(w<=h)
    {
    /*    scale=(GLfloat)primw/w;*/
        transx=(-w/2.0)*20.0/w;
        transy=(-h/2.0)*20.0/w;
    }
    else
    {
/*        scale=(GLfloat)primh/h;*/
        transx=(-w/2.0)*20.0/h;
        transy=(-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(<=x && x<=w && <=y && y<=h)
    {
        rotatex=(mousepy-y)/(GLfloat)h*;
        rotatey=(mousepx-x)/(GLfloat)w*;
/*        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(,,,);
    glutDisplayFunc(rend);
    glutMotionFunc(motion);
    glutMouseFunc(mousedown);
    glutReshapeFunc(reshape);
    glutMainLoop();

    return ;
}

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：

删除无用的文件（*.ui等），仅剩下main.cpp即可

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