DrawNode繪製幾何圖形

繼承關係

// 創建一個DrawNode
    Size visibleSize = Director::getInstance()->getVisibleSize();
    DrawNode* drawNode = DrawNode::create();
    drawNode->setPosition(Vec2(visibleSize.width * 0.5f,visibleSize.height * 0.5f));
    this->addChild(drawNode);
    /*
    繪製多邊形：
    void drawPolygon(const Vec2 *verts, int count, const Color4F &fillColor, float borderWidth, const Color4F &borderColor);
    1、verts：      需要繪製的點
    2、count：      繪製點的個數
    3、fillColor：  填充顏色
    4、borderWidth：邊框寬度
    5、borderColor：邊框顏色
    */

    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);

    /*
    繪製點：drawDot
    1、第一個參數爲點的位置
    2、第二個參數爲半徑值
    3、第三個參數爲填充顏色
    */
    drawNode->drawDot(Vec2(100.0f, 0.0f),50.0f, ccc4f(1, 0, 0, 1));

    // drawPolygon繪製三角形
    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));