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// Copyright 2005 by Anthony Liekens anthony@liekens.net
#include <SDL/SDL_gfxPrimitives.h>
#include "extensions.h"
double
frand() {
return (double)rand() / RAND_MAX;
}
double
frand( double max ) {
return max * frand();
}
Uint32 HSVtoRGB( float h, float s, float v )
{
int i;
float f, p, q, t, r, g, b;
if( s == 0 ) {
// achromatic (grey)
r = g = b = v;
} else {
h /= 60; // sector 0 to 5
i = (int)h;
f = h - i; // factorial part of h
p = v * ( 1 - s );
q = v * ( 1 - s * f );
t = v * ( 1 - s * ( 1 - f ) );
switch( i ) {
case 0:
r = v;
g = t;
b = p;
break;
case 1:
r = q;
g = v;
b = p;
break;
case 2:
r = p;
g = v;
b = t;
break;
case 3:
r = p;
g = q;
b = v;
break;
case 4:
r = t;
g = p;
b = v;
break;
default: // case 5:
r = v;
g = p;
b = q;
break;
}
}
return 256 * 256 * (int)( 255 * r ) + 256 * (int)( 255 * g ) + (int)( 255 * b );
}
Uint8 getRed( Uint32 color ) {
return ( color & 0xFF0000 ) >> 16;
}
Uint8 getGreen( Uint32 color ) {
return ( color & 0x00FF00 ) >> 8;
}
Uint8 getBlue( Uint32 color ) {
return color & 0x0000FF;
}
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