Color_Scales.h

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#ifndef COLOR_SCALE_H
#define COLOR_SCALE_H


typedef enum
{
        SCALE_TEMPERATURE,
        SCALE_FIRE,
        SCALE_ICE,
        SCALE_GREYSCALE,
        SCALE_THREE_LVL,
        SCALE_THREE_LVL_LINEAR,
        SCALE_THREE_LVL_LINEAR_NARROW,
        SCALE_GOOD_AND_EVIL,
        SCALE_COUNT
}Color_Scale_t;


static const char * const Color_Scale_names[SCALE_COUNT] =
{
        "temperature",
        "fire",
        "ice",
        "greyscale",
        "three levels",
        "three levels linear",
        "three levels linear narrow",
        "good and evil"
};


Color_Scale_t Color_Scale_from_name( char * name );

 
struct Color {
    int r;  
    int g;  
    int b;  
};




static inline void factor_to_color( struct Color *col, double factor, Color_Scale_t scale_type )
{
        double h=factor * 255;
        double f = 0;

        switch( scale_type ) {
                case SCALE_TEMPERATURE : // TEMPERATURE
                        if ( h < 60 ) {
                                f = h /60.0;
                                col->b = 255;

                                col->g = f * 255;
                                col->r = 0;

                        }

                        if ( 60 < h && h <= 120 ) {
                                f = (h /60.0) - 1;
                                col->b = (1 -f) *255;
                                col->g = 255;
                                col->r = 0;

                        }

                        if ( 120 < h && h <= 180 ) {
                                f = (h /60.0) - 2;
                                col->b = 0;
                                col->g = 255;
                                col->r = f * 255;

                        }

                        if ( h > 180) {
                                f = ((h /60.0) - 3)/1.25;
                                col->b = 0;
                                col->g = (1-f)*255;
                                col->r = 255;

                        }
                        break;
                case SCALE_FIRE : // FIRE
                        if( factor <= 0.5 ) {
                                col->r = 255 * factor;
                                col->g = 0;
                                col->b = 0;
                        } else {
                                col->r = 255 * factor;
                                col->g = (255 * (factor - 0.5)) * 1.8;
                                col->b = 0;
                        }
                        break;
                case SCALE_ICE : // ICE
                        col->r = 0;
                        col->g = 255 * factor;
                        col->b = 255 * factor;
                        break;
                case SCALE_GREYSCALE : //GREYSCALE
                        col->r = 255 * (1-factor);
                        col->g = 255 * (1-factor);
                        col->b = 255 * (1-factor);
                        break;
                case SCALE_THREE_LVL : //THREE LEVELS STRICT
                        col->r = 0;
                        col->g = 0;
                        col->b = 0;

                        if( factor < 0.3333 ) {
                                col->b = 255;
                        } else if( 0.6666 < factor ) {
                                col->r = 255;
                        } else {
                                col->r = 128;
                                col->g = 128;
                                col->b = 128;
                        }
                        break;
                case SCALE_THREE_LVL_LINEAR : //THREE LEVELS LINEAR LARGE AVG
                        col->r = 0;
                        col->g = 0;
                        col->b = 0;

                        if( factor < 0.3333 ) {
                                col->r = 0;
                                col->g = 0;
                                col->b = 255 * (1-(factor*3));
                        } else if( 0.6666 < factor ) {
                                col->r = 0;
                                col->g = 0;
                                col->r = 255 * (( factor - 0.6666 ) * 3);
                        } else {
                                col->r = 0;
                                col->g = 0;
                                col->b = 0;
                        }
                        break;
                case SCALE_THREE_LVL_LINEAR_NARROW : //THREE LEVELS LINEAR NARROW AVG
                        col->r = 0;
                        col->g = 0;
                        col->b = 0;

                        if( factor < 0.4705 ) {
                                col->r = 0;
                                col->g = 0;
                                col->b = 255 * (1-(factor*2.125));
                        } else if( 0.5294 < factor ) {
                                col->r = 0;
                                col->g = 0;
                                col->r = 255 * (( factor - 0.5294 ) * 2.125);
                        } else {
                                col->r = 0;
                                col->g = 0;
                                col->b = 0;
                        }
                        break;
                case SCALE_GOOD_AND_EVIL : //GOOD AND EVIL
                        col->r = 0;
                        col->g = 0;
                        col->b = 0;

                        if( factor < 0.5 ) {
                                col->b = 255;
                        } else {
                                col->r = 255;
                        }

                        break;
                default :
                        f = 0;
        }


}

















#endif /* COLOR_SCALE_H */