106 lines
1.5 KiB
C
106 lines
1.5 KiB
C
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#include "color.h"
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#include <math.h>
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uint32_t CCtoHEX( float note, float sat, float value )
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{
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float hue = 0.0;
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note = fmodf( note, 1.0 );
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note *= 12;
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if( note < 4 )
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{
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//Needs to be YELLOW->RED
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hue = (4 - note) / 24.0;
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}
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else if( note < 8 )
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{
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// [4] [8]
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//Needs to be RED->BLUE
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hue = ( 4 - note ) / 12.0;
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}
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else
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{
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// [8] [12]
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//Needs to be BLUE->YELLOW
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hue = ( 12 - note ) / 8.0 + 1./6.;
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}
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return HSVtoHEX( hue, sat, value );
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}
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//0/6: RED
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//1/6: YELLOW
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//2/6: GREEN
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//3/6: CYAN
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//4/6: BLUE
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//5/6: PURPLE
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//6/6: RED
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uint32_t HSVtoHEX( float hue, float sat, float value )
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{
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float pr = 0;
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float pg = 0;
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float pb = 0;
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short ora = 0;
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short og = 0;
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short ob = 0;
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float ro = fmod( hue * 6, 6. );
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float avg = 0;
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ro = fmod( ro + 6 + 1, 6 ); //Hue was 60* off...
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if( ro < 1 ) //yellow->red
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{
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pr = 1;
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pg = 1. - ro;
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} else if( ro < 2 )
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{
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pr = 1;
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pb = ro - 1.;
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} else if( ro < 3 )
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{
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pr = 3. - ro;
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pb = 1;
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} else if( ro < 4 )
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{
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pb = 1;
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pg = ro - 3;
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} else if( ro < 5 )
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{
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pb = 5 - ro;
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pg = 1;
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} else
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{
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pg = 1;
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pr = ro - 5;
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}
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//Actually, above math is backwards, oops!
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pr *= value;
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pg *= value;
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pb *= value;
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avg += pr;
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avg += pg;
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avg += pb;
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pr = pr * sat + avg * (1.-sat);
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pg = pg * sat + avg * (1.-sat);
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pb = pb * sat + avg * (1.-sat);
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ora = pr * 255;
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og = pb * 255;
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ob = pg * 255;
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if( ora < 0 ) ora = 0;
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if( ora > 255 ) ora = 255;
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if( og < 0 ) og = 0;
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if( og > 255 ) og = 255;
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if( ob < 0 ) ob = 0;
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if( ob > 255 ) ob = 255;
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return (ob<<16) | (og<<8) | ora;
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}
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