axmol/cocos2dx/label_nodes/CCLabelAtlas.cpp

/****************************************************************************
Copyright (c) 2010-2011 cocos2d-x.org
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2011      Zynga Inc.

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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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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****************************************************************************/
#include "CCLabelAtlas.h"
#include "CCTextureAtlas.h"
#include "CCPointExtension.h"
#include "CCDrawingPrimitives.h"
#include "ccConfig.h"

namespace cocos2d {

//CCLabelAtlas - Creation & Init
CCLabelAtlas * CCLabelAtlas::labelWithString(const char *label, const char *charMapFile, unsigned int itemWidth, int unsigned itemHeight, unsigned char startCharMap)
{
    CCLabelAtlas *pRet = new CCLabelAtlas();
    if(pRet && pRet->initWithString(label, charMapFile, itemWidth, itemHeight, startCharMap))
    {
        pRet->autorelease();
        return pRet;
    }
    CC_SAFE_DELETE(pRet)
    return NULL;
}

bool CCLabelAtlas::initWithString(const char *label, const char *charMapFile, unsigned int itemWidth, unsigned int itemHeight, unsigned char startCharMap)
{
    assert(label != NULL);
    if (CCAtlasNode::initWithTileFile(charMapFile, itemWidth, itemHeight, strlen(label)))
    {
        m_cMapStartChar = startCharMap;
        this->setString(label);
        return true;
    }
    return false;
}

//CCLabelAtlas - Atlas generation
void CCLabelAtlas::updateAtlasValues()
{
    unsigned int n = m_sString.length();

    ccV3F_C4B_T2F_Quad quad;

    const unsigned char *s = (unsigned char*)m_sString.c_str();

    CCTexture2D *texture = m_pTextureAtlas->getTexture();
    float textureWide = (float) texture->getPixelsWide();
    float textureHigh = (float) texture->getPixelsHigh();

    for(unsigned int i = 0; i < n; i++) {
        unsigned char a = s[i] - m_cMapStartChar;
        float row = (float) (a % m_uItemsPerRow);
        float col = (float) (a / m_uItemsPerRow);

#if CC_FIX_ARTIFACTS_BY_STRECHING_TEXEL
        // Issue #938. Don't use texStepX & texStepY
        float left		= (2 * row * m_uItemWidth + 1) / (2 * textureWide);
        float right		= left + (m_uItemWidth * 2 - 2) / (2 * textureWide);
        float top		= (2 * col * m_uItemHeight + 1) / (2 * textureHigh);
        float bottom	= top + (m_uItemHeight * 2 - 2) / (2 * textureHigh);
#else
        float left		= row * m_uItemWidth / textureWide;
        float right		= left + m_uItemWidth / textureWide;
        float top		= col * m_uItemHeight / textureHigh;
        float bottom	= top + m_uItemHeight / textureHigh;
#endif // ! CC_FIX_ARTIFACTS_BY_STRECHING_TEXEL

        quad.tl.texCoords.u = left;
        quad.tl.texCoords.v = top;
        quad.tr.texCoords.u = right;
        quad.tr.texCoords.v = top;
        quad.bl.texCoords.u = left;
        quad.bl.texCoords.v = bottom;
        quad.br.texCoords.u = right;
        quad.br.texCoords.v = bottom;

        quad.bl.vertices.x = (float) (i * m_uItemWidth);
        quad.bl.vertices.y = 0;
        quad.bl.vertices.z = 0.0f;
        quad.br.vertices.x = (float)(i * m_uItemWidth + m_uItemWidth);
        quad.br.vertices.y = 0;
        quad.br.vertices.z = 0.0f;
        quad.tl.vertices.x = (float)(i * m_uItemWidth);
        quad.tl.vertices.y = (float)(m_uItemHeight);
        quad.tl.vertices.z = 0.0f;
        quad.tr.vertices.x = (float)(i * m_uItemWidth + m_uItemWidth);
        quad.tr.vertices.y = (float)(m_uItemHeight);
        quad.tr.vertices.z = 0.0f;

        m_pTextureAtlas->updateQuad(&quad, i);
    }
}

//CCLabelAtlas - CCLabelProtocol
void CCLabelAtlas::setString(const char *label)
{
    unsigned int len = strlen(label);
    if (len > m_pTextureAtlas->getTotalQuads())
    {
        m_pTextureAtlas->resizeCapacity(len);
    }
    m_sString.clear();
    m_sString = label;
    this->updateAtlasValues();

    CCSize s;
    s.width = (float)(len * m_uItemWidth);
    s.height = (float)(m_uItemHeight);
    this->setContentSizeInPixels(s);

    m_uQuadsToDraw = len;
}

const char* CCLabelAtlas::getString(void)
{
    return m_sString.c_str();
}

//CCLabelAtlas - draw

#if CC_LABELATLAS_DEBUG_DRAW
void CCLabelAtlas::draw()
{
    CCAtlasNode::draw();

    const CCSize& s = this->getContentSize();
    CCPoint vertices[4]= {
        ccp(0,0),ccp(s.width,0),
        ccp(s.width,s.height),ccp(0,s.height),
    };
    ccDrawPoly(vertices, 4, true);
}
#endif
} // namespace cocos2d