#ifndef __CLIPPING_NODE_MANAGER_H__
#define __CLIPPING_NODE_MANAGER_H__

#include "cocos2d.h"
/*
強制引導管理者

建立強制引導:
auto cnm = ClippingNodeManager::create();
cnm->forcedRect(矩形範圍); 或 cnm->forcedRound(原點，半徑);
this->addChild(cnm);

取消強制引導:
this->removeChild(cnm);
*/

//強制區域型別
enum FORCED_TYPE
{
    FORCED_RECT,
    FORCED_ROUND
};

class ClippingNodeManager : public cocos2d::Layer
{
public:
    ClippingNodeManager();
    ~ClippingNodeManager();
    CREATE_FUNC(ClippingNodeManager);
    //設定矩形強制區域
    void forcedRect(cocos2d::Rect rect);
    //設定圓形強制區域
    void forcedRound(cocos2d::Vec2 pos, float radius);
private:
    //記錄強制區域型別
    int type;
    //記錄矩形區域
    cocos2d::Rect forced;
    //記錄圓形原點
    cocos2d::Vec2 pos;
    //記錄圓形半徑
    float radius;
    cocos2d::ClippingNode *clipper;
    cocos2d::EventListenerTouchOneByOne *listener;
    virtual bool init();
    virtual bool onTouchBegan(cocos2d::Touch *touch, cocos2d::Event *unused_event);
};


#endif // !__CLIPPING_NODE_MANAGER_H__#include "GlobalInclude.h"
#include "ClippingNodeManager.h"

USING_NS_CC;

ClippingNodeManager::ClippingNodeManager()
{}

ClippingNodeManager::~ClippingNodeManager()
{}

bool ClippingNodeManager::init()
{
    if(!Layer::init())
    {
        return false;
    }                           
    
    clipper = ClippingNode::create(); //建立一個ClippingNode物件
    clipper->setInverted(true); //設定底板可見，顯示剩餘部分
    clipper->setAlphaThreshold(1.0f);//設定繪製底板的Alpha值為0
    this->addChild(clipper, 1);

    auto layerBg = LayerColor::create(Color4B(0, 0, 0, 150));//添加了一個背景層
    clipper->addChild(layerBg);

    listener = EventListenerTouchOneByOne::create();//建立一個觸控監聽(單點觸控）  
    listener->onTouchBegan = CC_CALLBACK_2(ClippingNodeManager::onTouchBegan, this);//指定觸控的回撥函式  
    _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);//將listener和layer繫結，放入事件委託中
                                                 
    return true;
}

bool ClippingNodeManager::onTouchBegan(Touch *touch, Event *event)
{
    auto point = Director::getInstance()->convertToGL(touch->getLocationInView());//獲得當前觸控的座標
    bool isInForced = false;
    
    switch(type)
    {
        case FORCED_RECT:

            if(forced.containsPoint(point))//如果觸點處於rect中  
            {
                listener->setSwallowTouches(false);
            }
            else
            {
                listener->setSwallowTouches(true);
            }

            break;

        case FORCED_ROUND:

            float length = point.getDistance(pos);
            if(length <= radius)
            {
                listener->setSwallowTouches(false);
            }
            else
            {
                listener->setSwallowTouches(true);
            }

            break;
        
    }
    return true;
}

void ClippingNodeManager::forcedRect(Rect rect)
{
    type = FORCED_RECT;
    forced = rect;
    const ccColor4F color = {1, 0, 0, 0};

    Vec2 verts[4];
    verts[0] = rect.origin;
    verts[1] = Vec2(rect.origin.x, rect.origin.y + rect.size.height);
    verts[2] = Vec2(rect.origin.x + rect.size.width, rect.origin.y + rect.size.height);
    verts[3] = Vec2(rect.origin.x + rect.size.width, rect.origin.y);

    auto drawNode = DrawNode::create();
    drawNode->drawPolygon(verts, 4, color, 1, color);
    
    clipper->setStencil(drawNode);//設定裁剪模板
}

void ClippingNodeManager::forcedRound(cocos2d::Vec2 pos, float radius)
{
    type = FORCED_ROUND;
    this->pos = pos;
    this->radius = radius;
    const ccColor4F color = {1, 0, 0, 0};

    auto drawNode = DrawNode::create();
    drawNode->drawDot(pos, radius, color);

    clipper->setStencil(drawNode);//設定裁剪模板
}