Week04 放大縮小、旋轉

加上float angle=0

glPushMatrix()

glRotatef(angle,0,0,1)

glPopMatrix()

void motion(int x,int y)

glutMotionFunc(motion)

void display()

{

    glClearColor(1.0,0.0,0.9,1.0);

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glScalef(s,s,s);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

void motion(int x,int y)

{

    s=1+(x-150)/150.0;

    display();

}

void mouse(int button, int state, int x, int y)

{

    oldX=x;

}

void motion(int x,int y)

{

     angle+=(x-oldX);

     oldX=x;

     display();

}

void keyboard(unsigned char key,int x,int y)

{

    printf("key: %c x: %d  y: %d\n",key,x,y);

}

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

{

    glutKeyboardFunc(keyboard)

    glutMouseFunc(mouse)

    glutMotionFunc(motion)

}

自己旋轉

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)

    glPushMatrix()

        glRotatef(angle++,0,0,1)

        glutSolidTeapot(0.3)

    glPopMatrix()

    glutSwapBuffers()

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glClearColor(1.0,1.0,0.9,1.0);

        glTranslatef(0.8,0,0);

        glRotatef(angle++,0,0,1);

        glScalef(0.3,0.3,0.3);

        glColor3f(0,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

旋轉360

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle++,0,0,1);

        glTranslatef(0.8,0,0);

        glScalef(0.3,0.3,0.3);

        glColor3f(0,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

交換紅色部分