Week13_02131735_郭盈萱

#include <GL/glut.h>

float eyeX=-100,eyeY=80,eyeZ=-200;

void display()

{   GLfloat pos[]={0,0,200,0};

    glLightfv(GL_LIGHT0, GL_POSITION, pos);

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_LIGHTING);

    glEnable(GL_DEPTH_TEST);

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

      gluLookAt(eyeX,eyeY,eyeZ, 0,0,0,0,1,0);

      glPushMatrix();

      glutSolidTeapot(100);

     glPopMatrix();

    glPopMatrix();

    glFlush();

}

void motion(int x,int y)

{

    eyeX=x-400;eyeY=300-y;

    glutPostRedisplay();

}

void reshape(int w, int h)

{

    glViewport(0,0, w,h);

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    glOrtho(-w/2,w/2, -h/2,h/2,-1000,1000);

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

}

void timer(int t)

{

    glutTimerFunc(20,timer,t+1);

    eyeX+=2;

    if(eyeX>300) eyeY+=4;

    glutPostRedisplay();

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitWindowSize(800,600);

    glutCreateWindow("3D");

    glutDisplayFunc(display);

    glutReshapeFunc(reshape);

    glutMotionFunc(motion);

    glutTimerFunc(0,timer,0);

glViewport(0,0,800,600);

    glMatrixMode(GL_PROJECTION);

    glOrtho(-400,400,-300,300,-1000,1000);

    glMatrixMode(GL_MODELVIEW);

    glutMainLoop();

}