cocos2d-x之悦动的小球

发现问题：update()函数不能用virtual前缀

主：

bool HelloWorld::init()

{

if ( !LayerColor::initWithColor(Color4B(255,255,255,255)))

{

return false;

}

for (int i=0;i<10;i++) {

auto b=Ball::create();

b->setPosition(CCRANDOM_0_1()*200+400,CCRANDOM_0_1()*200+400);

addChild(b);

}

return true;

}

hpp：

#include <stdio.h>

#include "cocos2d.h"

using namespace cocos2d;

class Ball:public Sprite

{

public:

virtual bool init();

void update(float dt);

CREATE_FUNC(Ball);

private:

float speedX,speedY;

Size visibleSize;

};

cpp：

#include "Ball.hpp"

bool Ball::init(){

Sprite::initWithFile("GOODS_3201_0.png");

visibleSize=Director::getInstance()->getVisibleSize();

speedX=CCRANDOM_0_1()*10-5;//-5到5之间

speedY=CCRANDOM_0_1()*10-5;

scheduleUpdate();

return true;

}

void Ball::update(float dt){

setPosition(getPositionX()+speedX,getPositionY()+speedY);

if (getPositionX()<getContentSize().width/2) {

speedX=fabs(speedX);

}

if (getPositionX()>visibleSize.width-getContentSize().width/2) {

speedX=-fabs(speedX);

}

if (getPositionY()<getContentSize().height/2) {

speedY=fabs(speedY);

}

if (getPositionY()>visibleSize.height-getContentSize().height/2) {

speedY=-fabs(speedY);

}

}