【cocos2d-x IOS游戏开发-城市跑酷10】完善繁荣的城市街区及地形图类

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【cocos2d-x IOS游戏开发-捕鱼达人1】内容介绍

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【cocos2d-x IOS游戏开发-城市跑酷9】没有各种坑还叫游戏吗

定义一个地形类，继承于CCSprite，可以想象着把一块块街区与坑看做是一个个精灵。

//地形类
class Terrain : public CCSprite {

	CCArray * _blockPool;
	int _blockPoolIndex;

	CCArray * _blocks;
	int _lastBlockHeight;
	int _lastBlockWidth;
	int _minTerrainWidth;

	bool _showGap;
	CCSize _screenSize;

	int _currentPatternIndex;
	int _currentPatternCnt;
	int _currentWidthIndex;
	int _currentHeightIndex;
	int _currentTypeIndex;

	int _increaseGapInterval;
	float _increaseGapTimer;
	int _gapSize;

	void initTerrain (void);
	void addBlocks(int currentWidth);

	void distributeBlocks();
	void initBlock(Block * block);

	inline float getWidth () {

		int count = _blocks->count();
		int width = 0;
		Block * block;
		for (int i = 0; i < count; i++) {
			block = (Block *) _blocks->objectAtIndex(i);
			width += block->getWidth();
		}
		return width;
	}


public:

	Terrain(void);
	~Terrain(void);

	CC_SYNTHESIZE(bool, _startTerrain, StartTerrain);

	static Terrain * create();

	void activateChimneysAt (Player * player);
	void checkCollision (Player * player);

	void move (float xMove);
	void reset (void);


};

定义vector来随机生成街区的模式、高、宽以及类型：

int patterns[] = {1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,3,3,3};
int widths[] = {2,2,2,2,2,3,3,3,3,3,3,4,4,4,4,4,4};
int heights[] = {0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,2,2,2,3,3,3,3,3,3,4};
int types[] = {1,2,3,4,1,3,2,4,3,2,1,4,2,3,1,4,2,3,1,2,3,2,3,4,1,2,4,3,1,3,1,4,2,4,2,1,2,3};

vector<int> _blockPattern (patterns, patterns + sizeof(patterns) / sizeof(int));
vector<int> _blockWidths (widths, widths + sizeof(widths) / sizeof(int));
vector<int> _blockHeights (heights, heights + sizeof(heights) / sizeof(int));
vector<int> _blockTypes (types, types + sizeof(types) / sizeof(int));

初始化地形类：

先介绍一种随机算法：

random_shuffle()，用来对一个元素序列进行重新排序（随机的），包含在头文件 algorithm.h中。

void Terrain::initTerrain () {

	_increaseGapInterval = 5000;
	_increaseGapTimer = 0;
	_gapSize = 2;

	_blockPool = CCArray::createWithCapacity(20);
	_blockPool->retain();

	//init object pools
	Block * block;
	for (int i = 0; i < 20; i++) {
		block = Block::create();
		this->addChild(block);
		_blockPool->addObject(block);
	}

	_blocks = CCArray::createWithCapacity(20);
	_blocks->retain();

	_minTerrainWidth = _screenSize.width * 1.5f;


	random_shuffle(_blockPattern.begin(), _blockPattern.end());
	random_shuffle(_blockWidths.begin(), _blockWidths.end());
	random_shuffle(_blockHeights.begin(), _blockHeights.end());

	this->addBlocks(0);
}

地形图移动：

void Terrain::move (float xMove) {

	if (xMove < 0) return;


	if (_startTerrain) {

		if (xMove > 0 && _gapSize < 5) _increaseGapTimer += xMove;

		if (_increaseGapTimer > _increaseGapInterval) {
			_increaseGapTimer = 0;
			_gapSize += 1;
		}
	}

	this->setPositionX(this->getPositionX() - xMove);

	Block * block;
	block = (Block *) _blocks->objectAtIndex(0);

	if (this->getPositionX() + block->getWidth() < 0) {

		_blocks->removeObjectAtIndex(0);
		_blocks->addObject(block);

		this->setPositionX(this->getPositionX() + block->getWidth());

		float width_cnt = this->getWidth() - block->getWidth() - ((Block *) _blocks->objectAtIndex(0))->getWidth();
		this->initBlock(block);
		this->addBlocks(width_cnt);
	}
}

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