Week05 02160580課堂作業

#include <GL/glut.h>
float angle=0;
void display()
{
    glClear(GL_COLOR_BUFFER_BIT);
    glPushMatrix();
        glRotatef( angle, 0, 1, 0.5);
        glBegin(GL_POLYGON);
            glColor3f(1,0,0);
            glVertex3f(0.1,0.1,0.8);
            glVertex3f(-0.1,0.1,0.8);
            glVertex3f(-0.1,-0.1,0.8);
            glVertex3f(0.1,-0.1,0.8);
        glEnd();

        glBegin(GL_POLYGON);
            glColor3f(1,0,0);
            glVertex3f(0.1,0.1,-0.8);
            glVertex3f(-0.1,0.1,-0.8);
            glVertex3f(-0.1,-0.1,-0.8);
            glVertex3f(0.1,-0.1,-0.8);
        glEnd();

        glBegin(GL_QUAD_STRIP);
            glColor3f(1,1,1);
            glVertex3f(0.1,0.1,0.8);
            glVertex3f(0.1,0.1,-0.8);
            glVertex3f(-0.1,0.1,0.8);
            glVertex3f(-0.1,0.1,-0.8);
            glVertex3f(-0.1,-0.1,0.8);
            glVertex3f(-0.1,-0.1,-0.8);
            glVertex3f(0.1,-0.1,0.8);
            glVertex3f(0.1,-0.1,-0.8);
        glEnd();
    glPopMatrix();
    angle += 0.01;
    glFlush();
}
int oldX=0;
void motion(int x,int y)
{
    angle+=(x-oldX);
    oldX=x;
}
int main(int argc, char *argv[])
{
    glutInit(&argc, argv);
    glutCreateWindow("GLUT Shapes");
    glutDisplayFunc(display);
    glutIdleFunc(display);
    glutMotionFunc(motion);
    glutMainLoop();
}