cocos2d-x下实现摇杆

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本文介绍如何在Cocos2d-x中实现一个简单的摇杆控制器。该摇杆能够响应用户的触摸操作，并根据触摸位置计算出方向和力度。文章提供了完整的C++代码示例，包括Joystick类的设计和实现。

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cocos2d-x下实现摇杆

(2011-08-15 10:50:10)

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杂谈

实现方法采至http://www.cocoachina.com/bbs/read.php?tid-16365-keyword-ҡ��.html

他的使用oc实现，我翻译成c++版的。。

Joystick.h文件

#ifndef Joystick_H
#define Joystick_H
#include "cocos2d.h"
using namespace cocos2d;
class Joystick :public CCLayer {
public :
CCPoint centerPoint;//摇杆中心
CCPoint currentPoint;//摇杆当前位置
bool active;//是否激活摇杆
float radius;//摇杆半径
CCSprite *jsSprite;

void Active();
void Inactive();
CCPoint getDirection();
float getVelocity();
void updatePos(ccTime dt);

//初始化 aPoint是摇杆中心 aRadius是摇杆半径 aJsSprite是摇杆控制点 aJsBg是摇杆背景
static Joystick* JoystickWithCenter(CCPoint aPoint ,float aRadius ,CCSprite* aJsSprite,CCSprite* aJsBg);
Joystick * initWithCenter(CCPoint aPoint ,float aRadius ,CCSprite* aJsSprite,CCSprite* aJsBg);

virtual bool ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent);
virtual void ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent);
virtual void ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent);
LAYER_NODE_FUNC(Joystick);
};
#endif

Joystick.cpp文件

#include "Joystick.h"
void Joystick::updatePos(ccTime dt){
jsSprite->setPosition(ccpAdd(jsSprite->getPosition(),ccpMult(ccpSub(currentPoint, jsSprite->getPosition()),0.5)));
}

void Joystick::Active()
{
if (!active) {
active=true;
schedule(schedule_selector(Joystick::updatePos));//添加刷新函数
CCTouchDispatcher::sharedDispatcher()->addTargetedDelegate(this, 0,false);//添加触摸委托
}else {

}
}
//冻结摇杆
void Joystick::Inactive()
{
if (active) {
active=false;
this->unschedule(schedule_selector(Joystick::updatePos));//删除刷新
CCTouchDispatcher::sharedDispatcher()->removeDelegate(this);//删除委托
}else {

}
}

bool Joystick::ccTouchBegan(CCTouch* touch, CCEvent* event)
{
if (!active)
return false;
CCPoint touchPoint = touch->locationInView(touch->view());
touchPoint = CCDirector:: sharedDirector()->convertToGL(touchPoint);
if (ccpDistance(touchPoint, centerPoint) > radius)
return false;
currentPoint = touchPoint;
return true;
}

void Joystick::ccTouchMoved(CCTouch* touch, CCEvent* event)
{
CCPoint touchPoint = touch->locationInView(touch->view());
touchPoint = CCDirector:: sharedDirector()->convertToGL(touchPoint);
if (ccpDistance(touchPoint, centerPoint) > radius)
{
currentPoint =ccpAdd(centerPoint,ccpMult(ccpNormalize(ccpSub(touchPoint, centerPoint)), radius));
}else {
currentPoint = touchPoint;
}
}

void Joystick::ccTouchEnded(CCTouch* touch, CCEvent* event)
{

currentPoint = centerPoint;
}
//获取摇杆方位,注意是单位向量
CCPoint Joystick::getDirection()
{
return ccpNormalize(ccpSub(centerPoint, currentPoint));
}
//获取摇杆力度
float Joystick::getVelocity()
{
return ccpDistance(centerPoint, currentPoint);
}

Joystick* Joystick:: JoystickWithCenter(CCPoint aPoint ,float aRadius ,CCSprite* aJsSprite,CCSprite* aJsBg){
Joystick *jstick=Joystick::node();
jstick->initWithCenter(aPoint,aRadius,aJsSprite,aJsBg);
return jstick;
}

Joystick* Joystick::initWithCenter(CCPoint aPoint ,float aRadius ,CCSprite* aJsSprite,CCSprite* aJsBg){

active = false;
radius = aRadius;
centerPoint = aPoint;
currentPoint = centerPoint;
jsSprite = aJsSprite;
jsSprite->setPosition(centerPoint);
aJsBg->setPosition(centerPoint);
this->addChild(jsSprite);
this->addChild(aJsBg);
return this;
}

最终效果图为

在helloworld 里面添加

CCSprite *testPointL=CCSprite::spriteWithFile("LeftPoint.png");//摇杆
CCSprite *testBGL=CCSprite::spriteWithFile("LeftPlane.png");//摇杆背景
Joystick *testJSL=Joystick::JoystickWithCenter(ccp(80.0f,80.0f),60.0f ,testPointL ,testBGL);
this->addChild(testJSL);
testJSL->Active();