cocos2dx 3.0 绘制图形

	DrawNode* drawNode = DrawNode::create();
	drawNode->drawTriangle(Point(100, 100), Point(200, 200), Point(300, 100), Color4F::BLUE);
	this->addChild(drawNode);

	DrawNode* front=DrawNode::create();
	Point rect[4] = {ccp(-30, 30), ccp(30, 30), ccp(30, -30), ccp(-30, -30)};
	front->drawPolygon(rect, 4, Color4F::RED, 0, Color4F::BLUE);
	front->setPosition(Point(240, 160));
	this->addChild(front);