Engauge Digitizer 2
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ColorFilterStrategyHue.cpp
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1/******************************************************************************************************
2 * (C) 2014 markummitchell@github.com. This file is part of Engauge Digitizer, which is released *
3 * under GNU General Public License version 2 (GPLv2) or (at your option) any later version. See file *
4 * LICENSE or go to gnu.org/licenses for details. Distribution requires prior written permission. *
5 ******************************************************************************************************/
6
7#include "ColorConstants.h"
9#include <QColor>
10#include <qmath.h>
11
15
19
20double ColorFilterStrategyHue::pixelToZeroToOne (const QColor &pixel,
21 QRgb /* rgbBackground */) const
22{
23 double s = pixel.hueF();
24 if (s < 0) {
25 // Color is achromatic (r=g=b) so it has no hue
26 }
27
28 return s;
29}
30
32{
33 return qFloor (HUE_MIN + s * (HUE_MAX - HUE_MIN));
34}
const int HUE_MAX
const int HUE_MIN
ColorFilterStrategyHue()
Single constructor.
virtual int zeroToOneToValue(double s) const
Return the low value normalized to 0 to 1.
virtual double pixelToZeroToOne(const QColor &pixel, QRgb rgbBackground) const
Return a normalized value of 0 to 1 given input pixel.