坐标系－三角函数

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bool HelloWorld::init()

{

    if ( !Layer::init() )

    {

        return false;

    }

    Size visibleSize = Director::getInstance()->getVisibleSize();

    Vec2 origin = Director::getInstance()->getVisibleOrigin();

    _angle=0;

    auto dot=DrawNode::create();

    dot->drawDot(Vec2(0,0),10,Color4F(1.0,1.0,1.0,1.0));

    addChild(dot);

    dot->setPosition(visibleSize/2);

    schedule([dot,this,visibleSize](float f){

        dot->setPositionY(visibleSize.height/2+sin(_angle)*100.0);

        dot->setPositionX(visibleSize.width/2+cos(_angle)*100.0);

        _angle+=0.1;

    },"Test");

    return true;

}

坐标系－三角函数

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原文地址：http://www.cnblogs.com/daochong/p/5225914.html