OpenGL鼠标旋转图像

#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;
}

View Code
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