Cocos2d入门 <四> fire bullet

最新推荐文章于 2025-05-09 11:58:16 发布

真田幸村

最新推荐文章于 2025-05-09 11:58:16 发布

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分类专栏： cocos2d

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本文介绍了一个使用Cocos2d-x开发的简单射击游戏实现方法，详细讲解了如何通过触摸事件创建子弹对象，并根据玩家触摸的位置计算子弹移动的方向和终点。此外，还介绍了如何设置子弹的移动速度及移动路径。

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我们需要我们的英雄来发射子弹消灭敌人。

void HelloWorld::ccTouchesEnded(CCSet* touches, CCEvent* event)
{
	// Choose one of the touches to work with
	CCTouch* touch = (CCTouch*)( touches->anyObject() );
	CCPoint location = touch->locationInView();
	location = CCDirector::sharedDirector()->convertToGL(location);
	// Set up initial location of projectile
	CCSize winSize = CCDirector::sharedDirector()->getWinSize();
	CCSprite *projectile = CCSprite::create("Projectile.png",  CCRectMake(0, 0, 20, 20));
	projectile->setPosition( ccp(20, winSize.height/2) );
    
	// Determinie offset of location to projectile
	int offX = location.x - projectile->getPosition().x;
	int offY = location.y - projectile->getPosition().y;

	// Bail out if we are shooting down or backwards
	if (offX <= 0) return;

	// Ok to add now - we've double checked position
	this->addChild(projectile);
	// Determine where we wish to shoot the projectile to
    int realX = winSize.width + (projectile->getContentSize().width/2);
	float ratio = (float)offY / (float)offX;
	int realY = (realX * ratio) + projectile->getPosition().y;
	CCPoint realDest = ccp(realX, realY);

	// Determine the length of how far we're shooting
	int offRealX = realX - projectile->getPosition().x;
	int offRealY = realY - projectile->getPosition().y;
	
	float length = sqrtf((offRealX * offRealX) + (offRealY*offRealY));

	float velocity = 480/1; // 480pixels/1sec
	float realMoveDuration = length/velocity;

	// Move projectile to actual endpoint
	 projectile->runAction( CCSequence::actions(CCMoveTo::create(realMoveDuration, realDest),
					CCCallFuncN::create(this, 
					callfuncN_selector(HelloWorld::spriteMoveFinished)), 
					NULL) );


}




// on "init" you need to initialize your instance
bool HelloWorld::init()
{
　　......	
	this->setTouchEnabled(true);
	// Call game logic about every second
	this->schedule( schedule_selector(HelloWorld::gameLogic), 1.0 );

    return true;
}