RedCore/cocos2d/extensions/GUI/CCControlExtension/CCControlUtils.cpp

/****************************************************************************
Copyright (c) 2012 cocos2d-x.org

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#include "CCControlUtils.h"

NS_CC_EXT_BEGIN

Sprite* ControlUtils::addSpriteToTargetWithPosAndAnchor(const char* spriteName, Node * target, Vec2 pos, Vec2 anchor)
{
    Sprite *sprite =Sprite::createWithSpriteFrameName(spriteName);
    
    if (!sprite)
        return nullptr;

    sprite->setPosition(pos);
    sprite->setAnchorPoint(anchor);
    target->addChild(sprite);

    return sprite;
}


HSV ControlUtils::HSVfromRGB(RGBA value)
{
    HSV         out;
    double      min, max, delta;
    
    min = value.r < value.g ? value.r : value.g;
    min = min  < value.b ? min  : value.b;
    
    max = value.r > value.g ? value.r : value.g;
    max = max  > value.b ? max  : value.b;
    
    out.v = max;                                // v
    delta = max - min;
    if( max > 0.0 )
    {
        out.s = (delta / max);                  // s
    } else
    {
        // r = g = b = 0                        // s = 0, v is undefined
        out.s = 0.0;
        out.h = -1;                            // its now undefined (don't know if setting to NAN is a good idea)
        return out;
    }
    if( value.r >= max )                        // > is bogus, just keeps compilor happy
    {
        out.h = ( value.g - value.b ) / delta;        // between yellow & magenta
    } else
    {
        if( value.g >= max )
            out.h = 2.0 + ( value.b - value.r ) / delta;  // between cyan & yellow
        else
            out.h = 4.0 + ( value.r - value.g ) / delta;  // between magenta & cyan
    }
    
    out.h *= 60.0;                              // degrees
    
    if( out.h < 0.0 )
        out.h += 360.0;
    
    return out;
}

RGBA ControlUtils::RGBfromHSV(HSV value)
{
    double      hh, p, q, t, ff;
    long        i;
    RGBA        out;
    out.a        = 1;
    
    if (value.s <= 0.0) // < is bogus, just shuts up warnings
    {       
        if (std::isnan(value.h)) // value.h == NAN
        {   
            out.r = value.v;
            out.g = value.v;
            out.b = value.v;
            return out;
        }
        
        // error - should never happen
        out.r = 0.0;
        out.g = 0.0;
        out.b = 0.0;
        return out;
    }
    
    hh = value.h;
    if(hh >= 360.0) hh = 0.0;
    hh /= 60.0;
    i = (long)hh;
    ff = hh - i;
    p = value.v * (1.0 - value.s);
    q = value.v * (1.0 - (value.s * ff));
    t = value.v * (1.0 - (value.s * (1.0 - ff)));
    
    switch(i)
    {
        case 0:
            out.r = value.v;
            out.g = t;
            out.b = p;
            break;
        case 1:
            out.r = q;
            out.g = value.v;
            out.b = p;
            break;
        case 2:
            out.r = p;
            out.g = value.v;
            out.b = t;
            break;
            
        case 3:
            out.r = p;
            out.g = q;
            out.b = value.v;
            break;
        case 4:
            out.r = t;
            out.g = p;
            out.b = value.v;
            break;
        case 5:
        default:
            out.r = value.v;
            out.g = p;
            out.b = q;
            break;
    }
    return out;     
}

Rect ControlUtils::RectUnion(const Rect& src1, const Rect& src2) 
{
    Rect result;
    
    float x1 = MIN(src1.getMinX(), src2.getMinX());
    float y1 = MIN(src1.getMinY(), src2.getMinY());
    float x2 = MAX(src1.getMaxX(), src2.getMaxX());
    float y2 = MAX(src1.getMaxY(), src2.getMaxY());
    
    result.origin=Vec2(x1,y1);
    result.size=Size(x2-x1, y2-y1);
    return result;
}

NS_CC_EXT_END