Cocos2d-x3.1 多点触摸

#include "cocos2d.h"
#include "ui/CocosGUI.h"
USING_NS_CC;
using namespace ui;

class HelloWorld : public cocos2d::Layer
{
public:
// there's no 'id' in cpp, so we recommend returning the class instance pointer
static cocos2d::Scene* createScene();

// Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
virtual bool init();

void onTouchesBegan(const std::vector<Touch*>& touches,cocos2d::Event* event);
void onTouchesMoved(const std::vector<Touch*>& touches,cocos2d::Event* event);
void onTouchesEnded(const std::vector<Touch*>& touches,cocos2d::Event* event);
void onTouchesCancel(const std::vector<Touch*>& touches,cocos2d::Event* event);
// a selector callback
void menuCloseCallback(cocos2d::Ref* pSender);

// implement the "static create()" method manually
CREATE_FUNC(HelloWorld);
};

#include "HelloWorldScene.h"
#include "ui/CocosGUI.h"
USING_NS_CC;
using namespace ui;
static const Color3B* s_TouchColors[EventTouch::MAX_TOUCHES] = {
&Color3B::YELLOW,
&Color3B::BLUE,
&Color3B::GREEN,
&Color3B::RED,
&Color3B::MAGENTA
};

class TouchPoint : public Node
{
public:
//默认构造函数
TouchPoint()
{
setGLProgramState(GLProgramState::getOrCreateWithGLProgramName(GLProgram::SHADER_NAME_POSITION_TEXTURE_COLOR));
}
//draw函数
virtual void draw(Renderer *renderer,const Mat4 & transform, bool transformUpdated)
{
//设置线条颜色
DrawPrimitives::setDrawColor4B(_touchColor.r, _touchColor.g, _touchColor.b, 255);
//设置线条宽度
glLineWidth(10);
//画X、Y方向两条直线
DrawPrimitives::drawLine(Vec2(0,_touchPoint.y),Vec2(getContentSize().width,_touchPoint.y));
DrawPrimitives::drawLine(Vec2(_touchPoint.x,0),Vec2(_touchPoint.x,getContentSize().height));
//设置线条宽度
glLineWidth(1);
//设置点大小
DrawPrimitives::setPointSize(30);
//画点
DrawPrimitives::drawPoint(_touchPoint);
}
//设置触摸点位置
void setTouchPos(const Vec2& pt)
{
_touchPoint = pt;
}
//设置触摸点颜色
void setTouchColor(Color3B color)
{
_touchColor = color;
}
//构造触摸点
static TouchPoint* touchPointWithParent(Node* pParent)
{
auto pRet = new TouchPoint();
pRet->setContentSize(pParent->getContentSize());
pRet->setAnchorPoint(Vec2::ZERO);
pRet->autorelease();
return pRet;
}

private:
Vec2 _touchPoint;
Color3B _touchColor;
};

Scene* HelloWorld::createScene()
{
// 'scene' is an autorelease object
auto scene = Scene::create();

// 'layer' is an autorelease object
auto layer = HelloWorld::create();

// add layer as a child to scene
scene->addChild(layer);

// return the scene
return scene;
}

// on "init" you need to initialize your instance
bool HelloWorld::init()
{
//////////////////////////////
// 1. super init first
if ( !Layer::init() )
{
return false;
}

Size visibleSize = Director::getInstance()->getVisibleSize();
Vec2 origin = Director::getInstance()->getVisibleOrigin();

/////////////////////////////
// 2. add a menu item with "X" image, which is clicked to quit the program
// you may modify it.

// add a "close" icon to exit the progress. it's an autorelease object
auto closeItem = MenuItemImage::create(
"CloseNormal.png",
"CloseSelected.png",
CC_CALLBACK_1(HelloWorld::menuCloseCallback, this));

closeItem->setPosition(Vec2(origin.x + visibleSize.width - closeItem->getContentSize().width/2 ,
origin.y + closeItem->getContentSize().height/2));

// create menu, it's an autorelease object
auto menu = Menu::create(closeItem, NULL);
menu->setPosition(Vec2::ZERO);
this->addChild(menu, 1);

//设置事件监听
auto listener = EventListenerTouchAllAtOnce::create();
listener->onTouchesBegan = CC_CALLBACK_2(HelloWorld::onTouchesBegan,this);
listener->onTouchesMoved = CC_CALLBACK_2(HelloWorld::onTouchesMoved,this);
listener->onTouchesEnded = CC_CALLBACK_2(HelloWorld::onTouchesEnded,this);
//添加到事件分发器
Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(listener, this);

//标签
auto title = Label::createWithSystemFont("Please touch the screen", "", 24);
title->setPosition(Vec2(200,200));
addChild(title);
return true;
}

static Map<int, TouchPoint*> s_map;

void HelloWorld::onTouchesBegan(const std::vector<Touch *> &touches, cocos2d::Event *event)
{
for(auto &item : touches)
{
auto touch = item;
auto touchPoint = TouchPoint::touchPointWithParent(this);//初始化触摸点
auto location = touch->getLocation();

touchPoint->setTouchPos(location);//设置触摸位置
touchPoint->setTouchColor(*s_TouchColors[touch->getID()]);//设置颜色
addChild(touchPoint);
s_map.insert(touch->getID(), touchPoint);
}
}

void HelloWorld::onTouchesMoved(const std::vector<Touch *> &touches, cocos2d::Event *event)
{
for(auto &item : touches)
{
auto touch = item;
auto pTP = s_map.at(touch->getID());
auto location = touch->getLocation();
pTP->setTouchPos(location);
}
}

void HelloWorld::onTouchesEnded(const std::vector<Touch *> &touches, cocos2d::Event *event)
{
for(auto &item : touches)
{
auto touch = item;
auto pTP = s_map.at(touch->getID());
removeChild(pTP,true);
s_map.erase(touch->getID());
}
}

void HelloWorld::onTouchesCancel(const std::vector<Touch *> &touches, cocos2d::Event *event)
{
onTouchesEnded(touches, event);
}
void HelloWorld::menuCloseCallback(Ref* pSender)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WP8) || (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
MessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");
return;
#endif

Director::getInstance()->end();

#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
exit(0);
#endif
}