Week14_李慎行

#include <GL/glut.h>
float angle=0, oldX=0, oldY=0;
void display()
{
    {
    GLfloat pos[] = {0,0,-1,0};
    glLightfv(GL_LIGHT0, GL_POSITION, pos);
    glEnable(GL_LIGHT0);
    glEnable(GL_LIGHTING);
    }
    glEnable(GL_DEPTH_TEST);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
        glTranslatef(0.45,0.14,0);///version 4: 把樓下的整個再轉....往右掛在某個地方
        glRotatef(angle,0,0,1);///version 3: rotating teapot on the handle
        glTranslatef(0.5,0,0);///version 2: teapot on the right
        glutSolidTeapot(0.3);///version 1: A teapot
    glPopMatrix();
    glutSolidTeapot(0.3);
    glFlush();
}
void timer(int t)
{
    glutTimerFunc(20, timer, 0);
    ///angle++;
    glutPostRedisplay();
}
void mouse(int button, int state, int x,int y)
{
    if(state==GLUT_DOWN) { oldX=x; oldY=y;}
}
void motion(int x,int y)
{
    angle += (x -oldX);
    oldX=x;
}
int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutCreateWindow("TRT 3D");
    glutDisplayFunc(display);
    glutTimerFunc(20, timer,0);
    glutMouseFunc(mouse);
    glutMotionFunc(motion);
    glutMainLoop();
}