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//GameScene.h
#include "cocos2d.h"
USING_NS_CC;
class
GameScene :
public
cocos2d::Layer
{
public
:
static
cocos2d::Scene* createScene();
virtual
bool
init();
virtual
bool
onTouchBegan(Touch *touch, Event *unused_event);
virtual
void
onTouchMoved(Touch *touch, Event *unused_event);
bool
isCircleCollision(Point pos1,
float
radius1, Point pos2,
float
radius2);
CREATE_FUNC(GameScene);
private
:
//注意不能用auto关键字
Size size;
Sprite *sprite1, *sprite2;
Label *label;
};
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//GameScene.cpp
// Created by Jacedy on 14-8-11.
#include "GameScene.h"
USING_NS_CC;
cocos2d::Scene* GameScene::createScene()
{
auto
scene = Scene::create();
//创建一个场景
auto
layer = GameScene::create();
//创建一个图层
scene->addChild(layer);
return
scene;
}
//初始化当前的图层
bool
GameScene::init()
{
if
(!Layer::init())
//初始化父类
return
false
;
//获取屏幕大小
size = Director::getInstance()->getVisibleSize();
//auto size = Director::getInstance()->getWinSize();
//添加一个图片精灵
sprite1 = Sprite::create(
"r1.png"
);
sprite1->setPosition(Vec2(size.width/2, size.height/2));
this
->addChild(sprite1);
sprite2 = Sprite::create(
"r2.png"
);
sprite2->setPosition(Vec2(size.width*0.4, size.height/2));
this
->addChild(sprite2);
label = Label::createWithSystemFont(
"No collision"
,
"Marker Felt"
, 50);
label->setPosition(Vec2(size.width/2, size.height*0.7));
this
->addChild(label);
//创建监听事件对象
auto
listener = EventListenerTouchOneByOne::create();
//定义监听事件的回调函数
listener->onTouchBegan = CC_CALLBACK_2(GameScene::onTouchBegan,
this
);
listener->onTouchMoved = CC_CALLBACK_2(GameScene::onTouchMoved,
this
);
//在事件分发器中注册
_eventDispatcher->addEventListenerWithSceneGraphPriority(listener,
this
);
return
true
;
}
bool
GameScene::onTouchBegan(Touch *touch, Event *unused_event)
{
//获取触屏位置
Point pos = touch->getLocation();
sprite2->setPosition(pos);
log
(
"TouchBegan"
);
return
true
;
}
void
GameScene::onTouchMoved(Touch *touch, Event *unused_event)
{
Point pos = touch->getLocation();
sprite2->setPosition(pos);
if
(isCircleCollision(sprite1->getPosition(), sprite1->getContentSize().width/2, sprite2->getPosition(), sprite2->getContentSize().width/2))
label->setString(
"Collision!"
);
else
label->setString(
"No collision"
);
log
(
"TouchMoved"
);
}
bool
GameScene::isCircleCollision(Point pos1,
float
radius1, Point pos2,
float
radius2)
{
//运用勾股定理判断两圆是否相交
if
(
sqrt
(
pow
(pos1.x - pos2.x, 2) +
pow
(pos1.y - pos2.y, 2)) >
pow
(radius1 + radius2, 2))
{
return
false
;
}
return
true
;
}
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补充：其实有专门的圆形碰撞检测函数：isbong( )，可以试一下。
