坐标系－三角函数

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;

}