#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;}