57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
#ifndef W_F_PALETTE_HPP__
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#define W_F_PALETTE_HPP__
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#include <QMetaType>
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#include <QList>
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#include <QVector>
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#include <QColor>
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class QString;
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//
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// Class WFPalette
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//
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// Encapulates a waterfall palette description. A colour gradient
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// over 256 intervals is described by a list of RGB colour triplets.
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// The list of colours are use to interpolate the full 256 interval
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// waterfall colour gradient.
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//
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// Responsibilities
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//
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// Construction from a string which is a path to a file containing
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// colour descriptions in the form rrr;ggg;bbb on up to 256
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// consecutive lines, where rrr, ggg and, bbb are integral numbers in
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// the range 0<=n<256.
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//
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// Construction from a list of QColor instances. Up to the first 256
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// list elements are used.
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//
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// Includes a design GUI to create or adjust a WFPalette.
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//
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class WFPalette
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{
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public:
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using Colours = QList<QColor>;
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WFPalette () = default;
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explicit WFPalette (Colours const&);
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explicit WFPalette (QString const& file_path);
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WFPalette (WFPalette const&) = default;
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WFPalette& operator = (WFPalette const&) = default;
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Colours colours () const {return colours_;}
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// interpolate a gradient over 256 steps
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QVector<QColor> interpolate () const;
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// returns true if colours have been modified
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bool design ();
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private:
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Colours colours_;
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};
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Q_DECLARE_METATYPE (WFPalette::Colours);
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#endif
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