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#ifndef COLORSCALE_H
#define COLORSCALE_H
#include <initializer_list>
#include <QColor>
#include <QList>
class ColorScale
{
public:
ColorScale(const QColor &firstColor, const QColor &lastColor);
ColorScale(std::initializer_list<QColor> colors);
ColorScale(const QList<QColor> &colors);
virtual ~ColorScale();
QColor operator ()(float t) const { return color(t); }
virtual QColor color(float t) const;
void setExtents(float min, float max);
float min() const { return m_min; }
float max() const { return m_max; }
int numColors() const { return m_colors.size(); }
template<typename OutputIterator>
void sample(int samples, OutputIterator it) const;
protected:
float m_min, m_max;
QList<QColor> m_colors;
};
template<typename OutputIterator>
void ColorScale::sample(int samples, OutputIterator it) const
{
if (samples < 1) {
return;
}
float step = (max() - min()) / samples;
qreal r, g, b;
for (float t = min(); samples-- > 0; t += step) {
color(t).getRgbF(&r, &g, &b);
*it++ = r;
*it++ = g;
*it++ = b;
}
}
#endif // COLORSCALE_H
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