kicad/common/gal/color4d.cpp

/*
 * This program source code file is part of KICAD, a free EDA CAD application.
 *
 * Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
 * Copyright (C) 2012 Kicad Developers, see change_log.txt for contributors.
 *
 * Color class
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#include <gal/color4d.h>

using namespace KIGFX;

COLOR4D::COLOR4D( EDA_COLOR_T aColor )
{
    r = g_ColorRefs[aColor].m_Red / 255.0;
    g = g_ColorRefs[aColor].m_Green / 255.0;
    b = g_ColorRefs[aColor].m_Blue / 255.0;
    a = 1.0;
}


#ifdef WX_COMPATIBILITY
    COLOR4D::COLOR4D( const wxColour& aColor )
    {
        r = aColor.Red();
        g = aColor.Green();
        b = aColor.Blue();
        a = aColor.Alpha();
    }
#endif


const bool COLOR4D::operator==( const COLOR4D& aColor )
{
    return a == aColor.a && r == aColor.r && g == aColor.g && b == aColor.b;
}


const bool COLOR4D::operator!=( const COLOR4D& aColor )
{
    return a != aColor.a || r != aColor.r || g != aColor.g || b != aColor.b;
}


void COLOR4D::ToHSV( double& aOutH, double& aOutS, double& aOutV ) const
{
    double min, max, delta;

    min = r < g ? r : g;
    min = min < b ? min : b;

    max = r > g ? r : g;
    max = max > b ? max : b;

    aOutV = max;                                // v
    delta = max - min;

    if( max > 0.0 )
    {
        aOutS = ( delta / max );                  // s
    }
    else
    {
        // r = g = b = 0                        // s = 0, v is undefined
        aOutS = 0.0;
        aOutH = NAN;                            // its now undefined
        return;
    }

    if( r >= max )                          // > is bogus, just keeps compiler happy
        aOutH = ( g - b ) / delta;          // between yellow & magenta
    else if( g >= max )
        aOutH = 2.0 + ( b - r ) / delta;    // between cyan & yellow
    else
        aOutH = 4.0 + ( r - g ) / delta;    // between magenta & cyan

    aOutH *= 60.0;                          // degrees

    if( aOutH < 0.0 )
        aOutH += 360.0;
}


void COLOR4D::FromHSV( double aInH, double aInS, double aInV )
{
    double hh, p, q, t, ff;
    long i;

    if( aInS <= 0.0 )    // < is bogus, just shuts up warnings
    {
        r = aInV;
        g = aInV;
        b = aInV;
        return;
    }

    hh = aInH;

    if( hh >= 360.0 )
        hh = 0.0;

    hh /= 60.0;

    i = (long) hh;
    ff = hh - i;

    p = aInV * ( 1.0 - aInS );
    q = aInV * ( 1.0 - ( aInS * ff ) );
    t = aInV * ( 1.0 - ( aInS * ( 1.0 - ff ) ) );

    switch( i )
    {
    case 0:
        r = aInV;
        g = t;
        b = p;
        break;

    case 1:
        r = q;
        g = aInV;
        b = p;
        break;

    case 2:
        r = p;
        g = aInV;
        b = t;
        break;

    case 3:
        r = p;
        g = q;
        b = aInV;
        break;

    case 4:
        r = t;
        g = p;
        b = aInV;
        break;

    case 5:
    default:
        r = aInV;
        g = p;
        b = q;
        break;
    }
}


COLOR4D& COLOR4D::Saturate( double aFactor )
{
    double h, s, v;

    ToHSV( h, s, v );
    FromHSV( h, aFactor, 1.0 );

    return *this;
}