anonymous_namespace{Color.cpp} Namespace Reference

Functions
void	rgb2hsv (osg::Vec4f &c)
void	hsv2rgb (osg::Vec4f &c)

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Function Documentation

void anonymous_namespace{Color.cpp}::hsv2rgb

(

osg::Vec4f &

c

)

Definition at line 50 of file Color.cpp.

    {
        float h = c[0], s = c[1], v = c[2];
        if ( s == 0.0f ) {
            c.r() = c.g() = c.b() = 1.0f;
        }
        else {
            float vh = h*6.0f;
            float vi = floor(vh);
            float v1 = v * (1.0f - s);
            float v2 = v * (1.0f - s * (vh-vi));
            float v3 = v * (1.0f - s * (1.0f - (vh-vi)));
            float vr, vg, vb;
            if ( vi == 0.0f )      { vr = v,  vg = v3, vb = v1; }
            else if ( vi == 1.0f ) { vr = v2, vg = v,  vb = v1; }
            else if ( vi == 2.0f ) { vr = v1, vg = v,  vb = v3; }
            else if ( vi == 3.0f ) { vr = v1, vb = v2, vb = v; }
            else if ( vi == 4.0f ) { vr = v3, vg = v1, vb = v; }
            else                   { vr = v,  vg = v1, vb = v2; }
            c.set( vr, vg, vb, c.a() );
        }
    }

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void anonymous_namespace{Color.cpp}::rgb2hsv

(

osg::Vec4f &

c

)

Definition at line 29 of file Color.cpp.

    {
        float minval = std::min( c.r(), std::min( c.g(), c.b() ) );
        float maxval = std::max( c.r(), std::max( c.g(), c.b() ) );
        float delta = maxval - minval;
        float h = 0.0f, s = 0.0, v = maxval;
        if ( delta != 0.0f )
        {
            s = delta / maxval;
            float dr = (((maxval-c.r())/6.0f)+(delta/2.0f))/delta;
            float dg = (((maxval-c.g())/6.0f)+(delta/2.0f))/delta;
            float db = (((maxval-c.b())/6.0f)+(delta/2.0f))/delta;
            if ( c.r() == maxval ) h = db - dg;
            else if ( c.g() == maxval ) h = (1.0f/3.0f)+dr-db;
            else if ( c.b() == maxval ) h = (2.0f/3.0f)+dg-dr;
            if ( h < 0.0f ) h += 1.0f;
            if ( h > 1.0f ) h -= 1.0f;
        }
        c.set( h, s, v, c.a() );
    }

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