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Use Qt's built-in HSV conversion

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This commit is contained in:
Mike Walters
2015-09-04 10:00:24 +01:00
parent 2801ebbfcc
commit 736e91f72d
1 changed files with 1 additions and 56 deletions
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57
spectrogram.cpp
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@@ -51,58 +51,6 @@ template <class T> const T& clamp (const T& value, const T& min, const T& max) {
return std::min(max, std::max(min, value));
}
void HSVtoRGB( float *r, float *g, float *b, float h, float s, float v )
{
int i;
float f, p, q, t;
if( s == 0 ) {
// achromatic (grey)
*r = *g = *b = v;
return;
}
h /= 60; // sector 0 to 5
i = floor( 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;
}
}
void Spectrogram::paintEvent(QPaintEvent *event)
{
QElapsedTimer timer;
@@ -125,10 +73,7 @@ void Spectrogram::paintEvent(QPaintEvent *event)
float normPower = (line[x] - powerMax) * -1.0f / powerRange;
normPower = clamp(normPower, 0.0f, 1.0f);
float red, green, blue;
HSVtoRGB(&red, &green, &blue, normPower * 300.0f, 1, 1 - normPower);
image.setPixel(x, y, qRgb(red * 255, green * 255, blue * 255));
image.setPixel(x, y, QColor::fromHsvF(normPower * 0.83f, 1.0, 1.0 - normPower).rgba());
}
}