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63 lines
981 B
C++
63 lines
981 B
C++
#include "palette.h"
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#define HUE_INIT 0.1f
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#define HUE_INCREMENT 0.62f
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#define SATURATION 0.99f
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#define VALUE 0.99f
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static unsigned hsv2rgb(float h, float s, float v)
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{
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unsigned hi;
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float r = 0, g = 0, b = 0, p, q, t, f;
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hi = (unsigned)(h * 6.0f);
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f = h * 6.0f - hi;
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p = v * (1.0f - s);
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q = v * (1.0f - f * s);
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t = v * (1.0f - (1.0f - f) * s);
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switch (hi) {
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case 0:
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r = v; g = t; b = p;
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break;
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case 1:
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r = q; g = v; b = p;
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break;
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case 2:
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r = p; g = v; b = t;
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break;
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case 3:
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r = p; g = q; b = v;
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break;
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case 4:
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r = t; g = p; b = v;
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break;
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case 5:
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r = v; g = p; b = q;
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break;
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}
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return ((unsigned)(r * 256) << 16)
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+ ((unsigned)(g * 256) << 8)
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+ (unsigned)(b * 256);
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}
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Palette::Palette()
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{
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_hueState = HUE_INIT;
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}
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QColor Palette::color()
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{
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_hueState += HUE_INCREMENT;
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_hueState -= (int) _hueState;
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return QColor(hsv2rgb(_hueState, SATURATION, VALUE));
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}
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void Palette::reset()
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{
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_hueState = HUE_INIT;
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}
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