Week05 武鵬宇02160366 課堂作業

做一個3D旋轉的長方形

#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);;

        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 main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutCreateWindow("02160366");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop();

}

加了角度的參數和motion指令，讓用滑鼠拖曳可以讓3D模型轉動

int oldX=0;

void motion(int x,int y)

{

    angle +=(x-oldX);

    oldX=x;

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutCreateWindow("02160366");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMotionFunc(motion);

    glutMainLoop();

}