103 lines
1.5 KiB
C++
103 lines
1.5 KiB
C++
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#include "trop.h"
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#include "hsvutil.h"
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void OLDRGB2HSV(double r, double g, double b,
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double *h, double *s, double *v)
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{
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double max, min;
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double delta;
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max = tmax(r, g, b);
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min = tmin(r, g, b);
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*v = max;
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if (max != 0)
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*s = (max - min) / max;
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else
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*s = 0;
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if (*s == 0)
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*h = 0;
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else {
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delta = max - min;
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if (r == max)
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*h = (g - b) / delta;
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else if (g == max)
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*h = 2 + (b - r) / delta;
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else if (b == max)
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*h = 4 + (r - g) / delta;
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*h = *h * 60;
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if (*h < 0)
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*h += 360;
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}
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}
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void OLDHSV2RGB(double hue, double sat, double value,
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double *red, double *green, double *blue)
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{
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int i;
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double p, q, t, f;
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// if (hue > 360 || hue < 0)
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// hue=0;
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if (hue > 360)
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hue -= ((int)hue / 360) * 360;
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//hue-=360;
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if (hue < 0)
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hue += (1 - (int)hue / 360) * 360;
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//hue+=360;
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if (sat < 0)
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sat = 0;
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if (sat > 1)
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sat = 1;
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if (value < 0)
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value = 0;
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if (value > 1)
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value = 1;
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if (sat == 0) {
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*red = value;
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*green = value;
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*blue = value;
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} else {
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if (hue == 360)
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hue = 0;
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hue = hue / 60;
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i = (int)hue;
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f = hue - i;
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p = value * (1 - sat);
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q = value * (1 - (sat * f));
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t = value * (1 - (sat * (1 - f)));
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switch (i) {
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CASE 0 :
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*red = value;
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*green = t;
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*blue = p;
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CASE 1 :
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*red = q;
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*green = value;
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*blue = p;
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CASE 2 :
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*red = p;
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*green = value;
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*blue = t;
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CASE 3 :
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*red = p;
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*green = q;
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*blue = value;
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CASE 4 :
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*red = t;
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*green = p;
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*blue = value;
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CASE 5 :
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*red = value;
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*green = p;
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*blue = q;
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}
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}
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}
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