DrawNode绘制几何图形

// 创建一个DrawNode
Size visibleSize = Director::getInstance()->getVisibleSize();
DrawNode* drawNode = DrawNode::create();
drawNode->setPosition(Vec2(visibleSize.width * 0.5f,visibleSize.height * 0.5f));
this->addChild(drawNode);
/*
绘制多边形：
void drawPolygon(const Vec2 *verts, int count, const Color4F &fillColor, float borderWidth, const Color4F &borderColor);
1、verts：      需要绘制的点
2、count：      绘制点的个数
3、fillColor：  填充颜色
4、borderWidth：边框宽度
5、borderColor：边框颜色
*/

ccColor4F yellow = { 1, 1, 0, 1 };
Vec2 vecs[4] = { Vec2(-30.0f, 30.0f), Vec2(30.0f, 30.0f), Vec2(30.0f, -30.0f), Vec2(-30.0f, -30.0f) };
drawNode->drawPolygon(vecs, 4, yellow, 1, yellow);

/*
绘制点：drawDot
1、第一个参数为点的位置
2、第二个参数为半径值
3、第三个参数为填充颜色
*/
drawNode->drawDot(Vec2(100.0f, 0.0f),50.0f, ccc4f(1, 0, 0, 1));

// drawPolygon绘制三角形
Vec2 triangles[3];
triangles[0] = Vec2(0.0f, 50.0f);
triangles[1] = Vec2(200.0f, 50.0f);
triangles[2] = Vec2(0.0f, 200.0f);
drawNode->drawPolygon(triangles, 3, ccc4f(1, 0.5, 1, 0.5), 0, ccc4f(1, 0, 0, 1));