摇杆
新建工程名为testRocker
新建类HRocker
HRocker.h
//
// HRocker.h
// GameRockerTest
//
// Created by Himi on 12-9-24.
//
//
#ifndef __GameRockerTest__HRocker__
#define __GameRockerTest__HRocker__
#include "cocos2d.h"
using namespace cocos2d;
//用于标识摇杆与摇杆的背景
typedef enum{
tag_rocker,
tag_rockerBG,
}tagForHRocker;
class HRocker:public CCLayer{
public:
//创建摇杆（摇杆的操作体图片资源名，摇杆背景图片资源名，起始坐标）
static HRocker* createHRocker(const char* rockerImageName,const char* rockerBGImageName,CCPoint position);
//启动摇杆（显示摇杆、监听摇杆触屏事件）
void startRocker(bool _isStopOther);
//停止摇杆(隐藏摇杆，取消摇杆的触屏监听)
void stopRocker();
CREATE_FUNC(HRocker);
private:
//自定义初始化函数
void rockerInit(const char* rockerImageName,const char* rockerBGImageName,CCPoint position);
//是否可操作摇杆
bool isCanMove;
//获取当前摇杆与用户触屏点的角度
float getRad(CCPoint pos1,CCPoint pos2);
//摇杆背景的坐标
CCPoint rockerBGPosition;
//摇杆背景的半径
float rockerBGR;
//触屏事件
virtual bool ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent);
virtual void ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent);
virtual void ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent);
};
//
// HRocker.cpp
// GameRockerTest
//
// Created by Himi on 12-9-24.
//
//
#include "HRocker.h"
HRocker* HRocker::createHRocker(const char* rockerImageName,const char* rockerBGImageName,CCPoint position){
HRocker *layer = HRocker::create();
if(layer){
layer->rockerInit(rockerImageName, rockerBGImageName,position);
return layer;
}
CC_SAFE_DELETE(layer);
return NULL;
}
void HRocker::rockerInit(const char* rockerImageName,const char* rockerBGImageName,CCPoint position){
CCSprite * spRockerBG = CCSprite::create(rockerBGImageName);
spRockerBG->setPosition(position);
spRockerBG->setVisible(false);
addChild(spRockerBG,0,tag_rockerBG);
CCSprite * spRocker = CCSprite::create(rockerImageName);
spRocker->setPosition(position);
spRocker->setVisible(false);
addChild(spRocker,1,tag_rocker);
rockerBGPosition = position;
rockerBGR= spRockerBG->getContentSize().width*0.5;
}
//启动对摇杆的操作
void HRocker::startRocker(bool _isStopOther){
CCSprite * rocker = (CCSprite*)this->getChildByTag(tag_rocker);
rocker->setVisible(true);
CCSprite * rockerBG = (CCSprite*)this->getChildByTag(tag_rockerBG);
rockerBG->setVisible(true);
CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, -1, _isStopOther);
}
//停止对摇杆的操作
void HRocker::stopRocker(){
CCSprite * rocker = (CCSprite*)this->getChildByTag(tag_rocker);
rocker->setVisible(false);
CCSprite * rockerBG = (CCSprite*)this->getChildByTag(tag_rockerBG);
rockerBG->setVisible(false);
CCDirector::sharedDirector()->getTouchDispatcher()->removeDelegate(this);
}
//得到摇杆与触屏点所形成的角度
float HRocker::getRad(CCPoint pos1,CCPoint pos2) {
float px1 = pos1.x;
float py1 = pos1.y;
float px2 = pos2.x;
float py2 = pos2.y;
//得到两点X的距离
float x = px2 - px1;
//得到两点Y的距离
float y = py1 - py2;
//算出斜边长
float xie = sqrt(pow(x, 2) + pow(y, 2));
//得到这个角度的余弦值（通过三角函数中的定理 ：邻边/斜边=角度余弦值）
float cosAngle = x / xie;
//通过反余弦定理获取到其角度的弧度
float rad = acos(cosAngle);
//注意：当触屏的位置Y坐标<摇杆的Y坐标我们要取反值-0~-180
if (py2 < py1) {
rad = -rad;
}
return rad;
}
//得到半径为r的圆周运动上一个角度应对应的x、y坐标
CCPoint getAnglePosition(float r,float angle){
return ccp(r*cos(angle),r*sin(angle));
}
//抬起事件
bool HRocker::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent){
CCPoint point = pTouch->getLocation();
CCSprite * rocker = (CCSprite*)this->getChildByTag(tag_rocker);
if(rocker->boundingBox().containsPoint(point)){
isCanMove=true;
}
return true;
}
//移动事件
void HRocker::ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent){
if(!isCanMove){
return;
}
CCPoint point = pTouch->getLocation();
CCSprite * rocker = (CCSprite*)this->getChildByTag(tag_rocker);
//判断两个圆的圆心距是否大于摇杆背景的半径
if (sqrt(pow((rockerBGPosition.x - point.x), 2) +pow((rockerBGPosition.y - point.y), 2)) >= rockerBGR) {
//得到摇杆与触屏点所形成的角度
float angle = getRad(rockerBGPosition, point);
//保证内部小圆运动的长度限制
rocker->setPosition(ccpAdd(getAnglePosition(rockerBGR, angle),ccp(rockerBGPosition.x,rockerBGPosition.y)));
}else{
//当没有超过，让摇杆跟随用户触屏点移动即可
rocker->setPosition(point);
}
}
//离开事件
void HRocker::ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent){
if(!isCanMove){
return;
}
CCSprite * rockerBG = (CCSprite*)this->getChildByTag(tag_rockerBG);
CCSprite * rocker = (CCSprite*)this->getChildByTag(tag_rocker);
rocker->stopAllActions();
rocker->runAction(CCMoveTo::create(0.08, rockerBG->getPosition()));
isCanMove=false;
}
使用方法HRocker *rocker=HRocker::createHRocker("rocker.png", "rockerBG.png", ccp(240,160));
addChild(rocker);
rocker->startRocker(true);