OpenGL之旋转缩放

void CShape3D::drawCircle(void) {

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();
    glPushMatrix();
    //glTranslated(0.0f, 0.0f, 0.0f); //移动
    glRotated(angle, 0.5f, 0.5f, 0.0f);// 旋转
    angle += 1.0f;
    glScaled(2.0f, 2.0f, 2.0f);//x, y, z放大2倍
    scale += 0.1f;
    static GLUquadricObj* qobj=gluNewQuadric( );
    gluSphere(qobj,0.4,1000,10); 
    
    glPopMatrix();
    
    glFlush();
    glutSwapBuffers();
}

//旋转正方形

void CShape::init() {
	glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB) ;
	 glutInitWindowSize(400, 400) ;
	 glutCreateWindow("I love OpenGl") ;
	 glutDisplayFunc(CShape::displayWindow) ;
	 glutSpecialUpFunc(CShape::getKey);
	 glutReshapeFunc(CShape::shapeFunc);
	 glutMainLoop() ;
}

void CShape::getKey(GLint iKey, GLint x, GLint y) {
	switch (iKey)
	{
	case GLUT_KEY_UP:
		g_sAngle += kAngleStep;
		break;
	case GLUT_KEY_DOWN:
		g_sAngle -= kAngleStep;
		break;
	case GLUT_KEY_LEFT:
		g_sAngle += kAngleStep;
		break;
	case GLUT_KEY_RIGHT:
		g_sAngle -= kAngleStep;
		break;
	default:
		break;
	}
	<span style="color:#ff0000;">glutPostRedisplay();//刷新一下屏幕，如果不添加这行代码，看到效果很困难</span>
}

void CShape::draw3DSprialLine() {

}

void CShape::displayWindow() {
	glClear(GL_COLOR_BUFFER_BIT);
    //glPushMatrix();  
	glRotated(g_sAngle, 0.0, 0.0, 1.0);
    glBegin(GL_TRIANGLES);                            // 绘制三角形
        glVertex3f( 0.0f, 1.0f, 0.0f);                    // 上顶点
        glVertex3f(-1.0f,-1.0f, 0.0f);                    // 左下
        glVertex3f( 1.0f,-1.0f, 0.0f);                    // 右下
	glEnd();
	//glPopMatrix();
	glutSwapBuffers();
}

void CShape::idleFunc() {
	displayWindow();
}

void CShape::shapeFunc(GLint w, GLint h) {
	glViewport(0, 0, w, h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	gluLookAt(0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 5.0f, 0.0f);
}