axmol/cocos/2d/CCTMXLayer.cpp

/****************************************************************************
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2011      Zynga Inc.
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include "2d/CCTMXLayer.h"
#include "2d/CCTMXTiledMap.h"
#include "2d/CCSprite.h"
#include "base/CCDirector.h"
#include "base/ccUTF8.h"
#include "renderer/CCTextureCache.h"
#include "renderer/ccShaders.h"
#include "renderer/backend/Program.h"
#include "renderer/backend/ProgramState.h"

NS_CC_BEGIN


// TMXLayer - init & alloc & dealloc

TMXLayer * TMXLayer::create(TMXTilesetInfo *tilesetInfo, TMXLayerInfo *layerInfo, TMXMapInfo *mapInfo)
{
    TMXLayer *ret = new (std::nothrow) TMXLayer();
    if (ret->initWithTilesetInfo(tilesetInfo, layerInfo, mapInfo))
    {
        ret->autorelease();
        return ret;
    }
    CC_SAFE_DELETE(ret);
    return nullptr;
}
bool TMXLayer::initWithTilesetInfo(TMXTilesetInfo *tilesetInfo, TMXLayerInfo *layerInfo, TMXMapInfo *mapInfo)
{    
    // FIXME:: is 35% a good estimate ?
    Size size = layerInfo->_layerSize;
    float totalNumberOfTiles = size.width * size.height;
    float capacity = totalNumberOfTiles * 0.35f + 1; // 35 percent is occupied ?

    Texture2D *texture = nullptr;
    if( tilesetInfo )
    {
        texture = Director::getInstance()->getTextureCache()->addImage(tilesetInfo->_sourceImage);
    }

    if (nullptr == texture)
        return false;

    if (SpriteBatchNode::initWithTexture(texture, static_cast<ssize_t>(capacity)))
    {
        // layerInfo
        _layerName = layerInfo->_name;
        _layerSize = size;
        _tiles = layerInfo->_tiles;
        _opacity = layerInfo->_opacity;
        setProperties(layerInfo->getProperties());
        _contentScaleFactor = Director::getInstance()->getContentScaleFactor(); 

        // tilesetInfo
        _tileSet = tilesetInfo;
        CC_SAFE_RETAIN(_tileSet);

        // mapInfo
        _mapTileSize = mapInfo->getTileSize();
        _layerOrientation = mapInfo->getOrientation();
        _staggerAxis = mapInfo->getStaggerAxis();
        _staggerIndex = mapInfo->getStaggerIndex();
        _hexSideLength = mapInfo->getHexSideLength();

        // offset (after layer orientation is set);
        Vec2 offset = this->calculateLayerOffset(layerInfo->_offset);
        this->setPosition(CC_POINT_PIXELS_TO_POINTS(offset));

        _atlasIndexArray = ccCArrayNew(totalNumberOfTiles);

        float width = 0;
        float height = 0;
        if (_layerOrientation == TMXOrientationHex) {
            if (_staggerAxis == TMXStaggerAxis_X) {
                height = _mapTileSize.height * (_layerSize.height + 0.5);
                width = (_mapTileSize.width + _hexSideLength) * ((int)(_layerSize.width / 2)) + _mapTileSize.width * ((int)_layerSize.width % 2);
            } else {
                width = _mapTileSize.width * (_layerSize.width + 0.5);
                height = (_mapTileSize.height + _hexSideLength) * ((int)(_layerSize.height / 2)) + _mapTileSize.height * ((int)_layerSize.height % 2);
            }
        } else {
            width = _layerSize.width * _mapTileSize.width;
            height = _layerSize.height * _mapTileSize.height;
        }
        this->setContentSize(CC_SIZE_PIXELS_TO_POINTS(Size(width, height)));

        _useAutomaticVertexZ = false;
        _vertexZvalue = 0;
        
        return true;
    }
    return false;
}

TMXLayer::TMXLayer()
:_layerName("")
,_opacity(0)
,_vertexZvalue(0)
,_useAutomaticVertexZ(false)
,_reusedTile(nullptr)
,_atlasIndexArray(nullptr)
,_contentScaleFactor(1.0f)
,_layerSize(Size::ZERO)
,_mapTileSize(Size::ZERO)
,_tiles(nullptr)
,_tileSet(nullptr)
,_layerOrientation(TMXOrientationOrtho)
,_staggerAxis(TMXStaggerAxis_Y)
,_staggerIndex(TMXStaggerIndex_Even)
,_hexSideLength(0)
{}

TMXLayer::~TMXLayer()
{
    CC_SAFE_RELEASE(_tileSet);
    CC_SAFE_RELEASE(_reusedTile);

    if (_atlasIndexArray)
    {
        ccCArrayFree(_atlasIndexArray);
        _atlasIndexArray = nullptr;
    }

    CC_SAFE_FREE(_tiles);
}

void TMXLayer::releaseMap()
{
    if (_tiles)
    {
        free(_tiles);
        _tiles = nullptr;
    }

    if (_atlasIndexArray)
    {
        ccCArrayFree(_atlasIndexArray);
        _atlasIndexArray = nullptr;
    }
}

// TMXLayer - setup Tiles
void TMXLayer::setupTiles()
{    
    // Optimization: quick hack that sets the image size on the tileset
    _tileSet->_imageSize = _textureAtlas->getTexture()->getContentSizeInPixels();

    // By default all the tiles are aliased
    // pros:
    //  - easier to render
    // cons:
    //  - difficult to scale / rotate / etc.
    _textureAtlas->getTexture()->setAliasTexParameters();

    //CFByteOrder o = CFByteOrderGetCurrent();

    // Parse cocos2d properties
    this->parseInternalProperties();

    for (int y=0; y < _layerSize.height; y++)
    {
        for (int x=0; x < _layerSize.width; x++)
        {
            int newX = x;
            // fix correct render ordering in Hexagonal maps when stagger axis == x
            if (_staggerAxis == TMXStaggerAxis_X && _layerOrientation == TMXOrientationHex)
            {
                if (_staggerIndex == TMXStaggerIndex_Odd)
                {
                    if (x >= _layerSize.width/2)
                        newX = (x - std::ceil(_layerSize.width/2)) * 2 + 1;
                    else
                        newX = x * 2;
                } else {
                    // TMXStaggerIndex_Even
                    if (x >= static_cast<int>(_layerSize.width/2))
                        newX = (x - static_cast<int>(_layerSize.width/2)) * 2;
                    else
                        newX = x * 2 + 1;
                }
            }

            int pos = static_cast<int>(newX + _layerSize.width * y);
            int gid = _tiles[ pos ];

            // gid are stored in little endian.
            // if host is big endian, then swap
            //if( o == CFByteOrderBigEndian )
            //    gid = CFSwapInt32( gid );
            /* We support little endian.*/

            // FIXME:: gid == 0 --> empty tile
            if (gid != 0) 
            {
                this->appendTileForGID(gid, Vec2(newX, y));
            }
        }
    }
}

// TMXLayer - Properties
Value TMXLayer::getProperty(const std::string& propertyName) const
{
    if (_properties.find(propertyName) != _properties.end())
        return _properties.at(propertyName);
    
    return Value();
}

void TMXLayer::parseInternalProperties()
{
    // if cc_vertex=automatic, then tiles will be rendered using vertexz

    auto vertexz = getProperty("cc_vertexz");
    if (!vertexz.isNull())
    {
        std::string vertexZStr = vertexz.asString();
        // If "automatic" is on, then parse the "cc_alpha_func" too
        if (vertexZStr == "automatic")
        {
            _useAutomaticVertexZ = true;
            auto alphaFuncVal = getProperty("cc_alpha_func");
            float alphaFuncValue = alphaFuncVal.asFloat();

            setProgramStateWithRegistry(backend::ProgramType::POSITION_TEXTURE_COLOR_ALPHA_TEST, nullptr);

            auto& pipelineDescriptor = _quadCommand.getPipelineDescriptor();
            auto& vertexShader = pipelineDescriptor.programState->getProgram()->getVertexShader();

            auto alphaValueLocation = pipelineDescriptor.programState->getUniformLocation("u_alpha_value");
            pipelineDescriptor.programState->setUniform(alphaValueLocation, &alphaFuncValue, sizeof(alphaFuncValue));
        }
        else
        {
            _vertexZvalue = vertexz.asInt();
        }
    }
}

void TMXLayer::setupTileSprite(Sprite* sprite, const Vec2& pos, uint32_t gid)
{
    sprite->setPosition(getPositionAt(pos));
    sprite->setPositionZ((float)getVertexZForPos(pos));
    sprite->setAnchorPoint(Vec2::ZERO);
    sprite->setOpacity(_opacity);

    //issue 1264, flip can be undone as well
    sprite->setFlippedX(false);
    sprite->setFlippedY(false);
    sprite->setRotation(0.0f);
    sprite->setAnchorPoint(Vec2(0,0));

    // Rotation in tiled is achieved using 3 flipped states, flipping across the horizontal, vertical, and diagonal axes of the tiles.
    if (gid & kTMXTileDiagonalFlag)
    {
        // put the anchor in the middle for ease of rotation.
        sprite->setAnchorPoint(Vec2(0.5f,0.5f));
        sprite->setPosition(getPositionAt(pos).x + sprite->getContentSize().height/2,
           getPositionAt(pos).y + sprite->getContentSize().width/2 );

        auto flag = gid & (kTMXTileHorizontalFlag | kTMXTileVerticalFlag );

        // handle the 4 diagonally flipped states.
        if (flag == kTMXTileHorizontalFlag)
        {
            sprite->setRotation(90.0f);
        }
        else if (flag == kTMXTileVerticalFlag)
        {
            sprite->setRotation(270.0f);
        }
        else if (flag == (kTMXTileVerticalFlag | kTMXTileHorizontalFlag) )
        {
            sprite->setRotation(90.0f);
            sprite->setFlippedX(true);
        }
        else
        {
            sprite->setRotation(270.0f);
            sprite->setFlippedX(true);
        }
    }
    else
    {
        if (gid & kTMXTileHorizontalFlag)
        {
            sprite->setFlippedX(true);
        }

        if (gid & kTMXTileVerticalFlag)
        {
            sprite->setFlippedY(true);
        }
    }
}

Sprite* TMXLayer::reusedTileWithRect(const Rect& rect)
{
    if (! _reusedTile) 
    {
        _reusedTile = Sprite::createWithTexture(_textureAtlas->getTexture(), rect);
        _reusedTile->setBatchNode(this);
        _reusedTile->retain();
    }
    else
    {
        // FIXME: HACK: Needed because if "batch node" is nil,
        // then the Sprite'squad will be reset
        _reusedTile->setBatchNode(nullptr);
        
        // Re-init the sprite
        _reusedTile->setTextureRect(rect, false, rect.size);
        
        // restore the batch node
        _reusedTile->setBatchNode(this);
    }

    return _reusedTile;
}

// TMXLayer - obtaining tiles/gids
Sprite * TMXLayer::getTileAt(const Vec2& pos)
{
    CCASSERT(pos.x < _layerSize.width && pos.y < _layerSize.height && pos.x >=0 && pos.y >=0, "TMXLayer: invalid position");
    CCASSERT(_tiles && _atlasIndexArray, "TMXLayer: the tiles map has been released");

    Sprite *tile = nullptr;
    int gid = this->getTileGIDAt(pos);

    // if GID == 0, then no tile is present
    if (gid) 
    {
        int z = (int)(pos.x + pos.y * _layerSize.width);
        tile = static_cast<Sprite*>(this->getChildByTag(z));

        // tile not created yet. create it
        if (! tile) 
        {
            Rect rect = _tileSet->getRectForGID(gid);
            rect = CC_RECT_PIXELS_TO_POINTS(rect);

            tile = Sprite::createWithTexture(this->getTexture(), rect);
            tile->setBatchNode(this);
            tile->setPosition(getPositionAt(pos));
            tile->setPositionZ((float)getVertexZForPos(pos));
            tile->setAnchorPoint(Vec2::ZERO);
            tile->setOpacity(_opacity);

            ssize_t indexForZ = atlasIndexForExistantZ(z);
            this->addSpriteWithoutQuad(tile, static_cast<int>(indexForZ), z);
        }
    }
    
    return tile;
}

uint32_t TMXLayer::getTileGIDAt(const Vec2& pos, TMXTileFlags* flags/* = nullptr*/)
{
    CCASSERT(pos.x < _layerSize.width && pos.y < _layerSize.height && pos.x >=0 && pos.y >=0, "TMXLayer: invalid position");
    CCASSERT(_tiles && _atlasIndexArray, "TMXLayer: the tiles map has been released");

    ssize_t idx = static_cast<int>(((int) pos.x + (int) pos.y * _layerSize.width));
    // Bits on the far end of the 32-bit global tile ID are used for tile flags
    uint32_t tile = _tiles[idx];

    // issue1264, flipped tiles can be changed dynamically
    if (flags) 
    {
        *flags = (TMXTileFlags)(tile & kTMXFlipedAll);
    }
    
    return (tile & kTMXFlippedMask);
}

// TMXLayer - adding helper methods
Sprite * TMXLayer::insertTileForGID(uint32_t gid, const Vec2& pos)
{
    if (gid != 0 && (static_cast<int>((gid & kTMXFlippedMask)) - _tileSet->_firstGid) >= 0)
    {
        Rect rect = _tileSet->getRectForGID(gid);
        rect = CC_RECT_PIXELS_TO_POINTS(rect);
        
        intptr_t z = (intptr_t)((int) pos.x + (int) pos.y * _layerSize.width);
        
        Sprite *tile = reusedTileWithRect(rect);
        
        setupTileSprite(tile, pos, gid);
        
        // get atlas index
        ssize_t indexForZ = atlasIndexForNewZ(static_cast<int>(z));
        
        // Optimization: add the quad without adding a child
        this->insertQuadFromSprite(tile, indexForZ);
        
        // insert it into the local atlasindex array
        ccCArrayInsertValueAtIndex(_atlasIndexArray, (void*)z, indexForZ);
        
        // update possible children
        
        for(const auto &child : _children) {
            Sprite* sp = static_cast<Sprite*>(child);
            auto ai = sp->getAtlasIndex();
            if ( ai >= indexForZ )
            {
                sp->setAtlasIndex(ai+1);
            }
        }
        
        _tiles[z] = gid;
        return tile;
    }
    
    return nullptr;
}

Sprite * TMXLayer::updateTileForGID(uint32_t gid, const Vec2& pos)
{
    Rect rect = _tileSet->getRectForGID(gid);
    rect = Rect(rect.origin.x / _contentScaleFactor, rect.origin.y / _contentScaleFactor, rect.size.width/ _contentScaleFactor, rect.size.height/ _contentScaleFactor);
    int z = (int)((int) pos.x + (int) pos.y * _layerSize.width);

    Sprite *tile = reusedTileWithRect(rect);

    setupTileSprite(tile ,pos ,gid);

    // get atlas index
    auto indexForZ = atlasIndexForExistantZ(z);
    tile->setAtlasIndex(static_cast<unsigned int>(indexForZ) );
    tile->setDirty(true);
    tile->updateTransform();
    _tiles[z] = gid;

    return tile;
}

intptr_t TMXLayer::getZForPos(const Vec2& pos) const
{
    intptr_t z = -1;
    // fix correct render ordering in Hexagonal maps when stagger axis == x
    if (_staggerAxis == TMXStaggerAxis_X && _layerOrientation == TMXOrientationHex)
    {
        if (_staggerIndex == TMXStaggerIndex_Odd)
        {
            if (((int)pos.x % 2) == 0)
                z = pos.x / 2 + pos.y * _layerSize.width;
            else
                z = pos.x / 2 + std::ceil(_layerSize.width / 2) + pos.y * _layerSize.width;
        } else {
            // TMXStaggerIndex_Even
            if (((int)pos.x % 2) == 1)
                z = pos.x / 2 + pos.y * _layerSize.width;
            else
                z = pos.x / 2 + std::floor(_layerSize.width / 2) + pos.y * _layerSize.width;
        }
    }
    else
    {
        z = (pos.x + pos.y * _layerSize.width);
    }

    CCASSERT(z != -1, "Invalid Z");
    return z;
}

// used only when parsing the map. useless after the map was parsed
// since lot's of assumptions are no longer true
Sprite * TMXLayer::appendTileForGID(uint32_t gid, const Vec2& pos)
{
    if (gid != 0 && (static_cast<int>((gid & kTMXFlippedMask)) - _tileSet->_firstGid) >= 0)
    {
        Rect rect = _tileSet->getRectForGID(gid);
        rect = CC_RECT_PIXELS_TO_POINTS(rect);

        // Z could be just an integer that gets incremented each time it is called.
        // but that wouldn't work on layers with empty tiles.
        // and it is IMPORTANT that Z returns an unique and bigger number than the previous one.
        // since _atlasIndexArray must be ordered because `bsearch` is used to find the GID for
        // a given Z. (github issue #16512)
        intptr_t z = getZForPos(pos);

        Sprite *tile = reusedTileWithRect(rect);
        
        setupTileSprite(tile ,pos ,gid);
        
        // optimization:
        // The difference between appendTileForGID and insertTileforGID is that append is faster, since
        // it appends the tile at the end of the texture atlas
        ssize_t indexForZ = _atlasIndexArray->num;
        
        // don't add it using the "standard" way.
        insertQuadFromSprite(tile, indexForZ);
        
        // append should be after addQuadFromSprite since it modifies the quantity values
        ccCArrayInsertValueAtIndex(_atlasIndexArray, (void*)z, indexForZ);

        // Validation for issue #16512
        CCASSERT(_atlasIndexArray->num == 1 ||
                 _atlasIndexArray->arr[_atlasIndexArray->num-1] > _atlasIndexArray->arr[_atlasIndexArray->num-2], "Invalid z for _atlasIndexArray");

        return tile;
    }
    
    return nullptr;
}

// TMXLayer - atlasIndex and Z
static inline int compareInts(const void * a, const void * b)
{
    const int ia = *(int*)a;
    const int ib = *(int*)b;
    return (ia-ib);
}

ssize_t TMXLayer::atlasIndexForExistantZ(int z)
{
    int key=z;
    int *item = (int*)bsearch((void*)&key, (void*)&_atlasIndexArray->arr[0], _atlasIndexArray->num, sizeof(void*), compareInts);

    CCASSERT(item, "TMX atlas index not found. Shall not happen");

    ssize_t index = ((size_t)item - (size_t)_atlasIndexArray->arr) / sizeof(void*);
    return index;
}

ssize_t TMXLayer::atlasIndexForNewZ(int z)
{
    // FIXME:: This can be improved with a sort of binary search
    ssize_t i=0;
    for (i=0; i< _atlasIndexArray->num ; i++) 
    {
        ssize_t val = (size_t) _atlasIndexArray->arr[i];
        if (z < val)
        {
            break;
        }
    } 
    
    return i;
}

// TMXLayer - adding / remove tiles
void TMXLayer::setTileGID(uint32_t gid, const Vec2& pos)
{
    setTileGID(gid, pos, (TMXTileFlags)0);
}

void TMXLayer::setTileGID(uint32_t gid, const Vec2& pos, TMXTileFlags flags)
{
    CCASSERT(pos.x < _layerSize.width && pos.y < _layerSize.height && pos.x >=0 && pos.y >=0, "TMXLayer: invalid position");
    CCASSERT(_tiles && _atlasIndexArray, "TMXLayer: the tiles map has been released");
    CCASSERT(gid == 0 || (int)gid >= _tileSet->_firstGid, "TMXLayer: invalid gid" );

    TMXTileFlags currentFlags;
    uint32_t currentGID = getTileGIDAt(pos, &currentFlags);

    if (currentGID != gid || currentFlags != flags) 
    {
        uint32_t gidAndFlags = gid | flags;

        // setting gid=0 is equal to remove the tile
        if (gid == 0)
        {
            removeTileAt(pos);
        }
        // empty tile. create a new one
        else if (currentGID == 0)
        {
            insertTileForGID(gidAndFlags, pos);
        }
        // modifying an existing tile with a non-empty tile
        else 
        {
            int z = (int) pos.x + (int) pos.y * _layerSize.width;
            Sprite *sprite = static_cast<Sprite*>(getChildByTag(z));
            if (sprite)
            {
                Rect rect = _tileSet->getRectForGID(gid);
                rect = CC_RECT_PIXELS_TO_POINTS(rect);

                sprite->setTextureRect(rect, false, rect.size);
                if (flags) 
                {
                    setupTileSprite(sprite, sprite->getPosition(), gidAndFlags);
                }
                _tiles[z] = gidAndFlags;
            } 
            else 
            {
                updateTileForGID(gidAndFlags, pos);
            }
        }
    }
}

void TMXLayer::addChild(Node* /*child*/, int /*zOrder*/, int /*tag*/)
{
    CCASSERT(0, "addChild: is not supported on TMXLayer. Instead use setTileGID:at:/tileAt:");
}

void TMXLayer::removeChild(Node* node, bool cleanup)
{
    Sprite *sprite = (Sprite*)node;
    // allows removing nil objects
    if (! sprite)
    {
        return;
    }

    CCASSERT(_children.contains(sprite), "Tile does not belong to TMXLayer");

    ssize_t atlasIndex = sprite->getAtlasIndex();
    ssize_t zz = (ssize_t)_atlasIndexArray->arr[atlasIndex];
    _tiles[zz] = 0;
    ccCArrayRemoveValueAtIndex(_atlasIndexArray, atlasIndex);
    SpriteBatchNode::removeChild(sprite, cleanup);
}

void TMXLayer::removeTileAt(const Vec2& pos)
{
    CCASSERT(pos.x < _layerSize.width && pos.y < _layerSize.height && pos.x >=0 && pos.y >=0, "TMXLayer: invalid position");
    CCASSERT(_tiles && _atlasIndexArray, "TMXLayer: the tiles map has been released");

    int gid = getTileGIDAt(pos);

    if (gid) 
    {
        int z = pos.x + pos.y * _layerSize.width;
        ssize_t atlasIndex = atlasIndexForExistantZ(z);

        // remove tile from GID map
        _tiles[z] = 0;

        // remove tile from atlas position array
        ccCArrayRemoveValueAtIndex(_atlasIndexArray, atlasIndex);

        // remove it from sprites and/or texture atlas
        Sprite *sprite = (Sprite*)getChildByTag(z);
        if (sprite)
        {
            SpriteBatchNode::removeChild(sprite, true);
        }
        else 
        {
            _textureAtlas->removeQuadAtIndex(atlasIndex);

            // update possible children
            for(const auto &obj : _children) {
                Sprite* child = static_cast<Sprite*>(obj);
                auto ai = child->getAtlasIndex();
                if ( ai >= atlasIndex )
                {
                    child->setAtlasIndex(ai-1);
                }
            }
        }
    }
}

//CCTMXLayer - obtaining positions, offset
Vec2 TMXLayer::calculateLayerOffset(const Vec2& pos)
{
    Vec2 ret;
    switch (_layerOrientation)
    {
        case TMXOrientationOrtho:
            ret.set( pos.x * _mapTileSize.width, -pos.y *_mapTileSize.height);
            break;
        case TMXOrientationIso:
            ret.set((_mapTileSize.width /2) * (pos.x - pos.y),
                  (_mapTileSize.height /2 ) * (-pos.x - pos.y));
            break;
        case TMXOrientationHex:
        {
            if(_staggerAxis == TMXStaggerAxis_Y)
            {
                int diffX = (_staggerIndex == TMXStaggerIndex_Even) ? _mapTileSize.width/2 : 0;
                ret.set(pos.x * _mapTileSize.width + diffX, -pos.y * (_mapTileSize.height - (_mapTileSize.width - _hexSideLength) / 2));
            }
            else if(_staggerAxis == TMXStaggerAxis_X)
            {
                int diffY = (_staggerIndex == TMXStaggerIndex_Odd) ? _mapTileSize.height/2 : 0;
                ret.set(pos.x * (_mapTileSize.width - (_mapTileSize.width - _hexSideLength) / 2), -pos.y * _mapTileSize.height + diffY);
            }
            break;
        }
        case TMXOrientationStaggered:
        {
            float diffX = 0;
            if ((int)std::abs(pos.y) % 2 == 1)
            {
                diffX = _mapTileSize.width/2;
            }
            ret.set(pos.x * _mapTileSize.width + diffX,
                         (-pos.y) * _mapTileSize.height/2);
        }
        break;
    }
    return ret;    
}

Vec2 TMXLayer::getPositionAt(const Vec2& pos)
{
    Vec2 ret;
    switch (_layerOrientation)
    {
    case TMXOrientationOrtho:
        ret = getPositionForOrthoAt(pos);
        break;
    case TMXOrientationIso:
        ret = getPositionForIsoAt(pos);
        break;
    case TMXOrientationHex:
        ret = getPositionForHexAt(pos);
        break;
    case TMXOrientationStaggered:
        ret = getPositionForStaggeredAt(pos);
        break;
    }
    ret = CC_POINT_PIXELS_TO_POINTS( ret );
    return ret;
}

Vec2 TMXLayer::getPositionForOrthoAt(const Vec2& pos)
{
    return Vec2(pos.x * _mapTileSize.width,
                            (_layerSize.height - pos.y - 1) * _mapTileSize.height);
}

Vec2 TMXLayer::getPositionForIsoAt(const Vec2& pos)
{
    return Vec2(_mapTileSize.width /2 * (_layerSize.width + pos.x - pos.y - 1),
                             _mapTileSize.height /2 * ((_layerSize.height * 2 - pos.x - pos.y) - 2));
}

Vec2 TMXLayer::getPositionForHexAt(const Vec2& pos)
{
    Vec2 xy;
    Vec2 offset = _tileSet->_tileOffset;

    int odd_even = (_staggerIndex == TMXStaggerIndex_Odd) ? 1 : -1;
    switch (_staggerAxis)
    {
        case TMXStaggerAxis_Y:
        {
            float diffX = 0;
            if ((int)pos.y % 2 == 1)
            {
                diffX = _mapTileSize.width/2 * odd_even;
            }
            xy = Vec2(pos.x * _mapTileSize.width+diffX+offset.x,
                      (_layerSize.height - pos.y - 1) * (_mapTileSize.height-(_mapTileSize.height-_hexSideLength)/2)-offset.y);
            break;
        }
            
        case TMXStaggerAxis_X:
        {
            float diffY = 0;
            if ((int)pos.x % 2 == 1)
            {
                diffY = _mapTileSize.height/2 * -odd_even;
            }
            
            xy = Vec2(pos.x * (_mapTileSize.width-(_mapTileSize.width-_hexSideLength)/2)+offset.x,
                      (_layerSize.height - pos.y - 1) * _mapTileSize.height + diffY-offset.y);
            break;
        }
    }
    return xy;
}

Vec2 TMXLayer::getPositionForStaggeredAt(const Vec2 &pos)
{
    float diffX = 0;
    if ((int)pos.y % 2 == 1)
    {
        diffX = _mapTileSize.width/2;
    }
    return Vec2(pos.x * _mapTileSize.width + diffX,
                (_layerSize.height - pos.y - 1) * _mapTileSize.height/2);
}

int TMXLayer::getVertexZForPos(const Vec2& pos)
{
    int ret = 0;
    int maxVal = 0;
    if (_useAutomaticVertexZ)
    {
        switch (_layerOrientation) 
        {
        case TMXOrientationIso:
            maxVal = static_cast<int>(_layerSize.width + _layerSize.height);
            ret = static_cast<int>(-(maxVal - (pos.x + pos.y)));
            break;
        case TMXOrientationOrtho:
            ret = static_cast<int>(-(_layerSize.height-pos.y));
            break;
        case TMXOrientationStaggered:
            ret = static_cast<int>(-(_layerSize.height-pos.y));
            break;
        case TMXOrientationHex:
            ret = static_cast<int>(-(_layerSize.height-pos.y));
            break;
        default:
            CCASSERT(0, "TMX invalid value");
            break;
        }
    } 
    else
    {
        ret = _vertexZvalue;
    }
    
    return ret;
}

std::string TMXLayer::getDescription() const
{
    return StringUtils::format("<TMXLayer | tag = %d, size = %d,%d>", _tag, (int)_mapTileSize.width, (int)_mapTileSize.height);
}


NS_CC_END