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0001 /* 0002 * Copyright (C) 2001-2015 Klaralvdalens Datakonsult AB. All rights reserved. 0003 * 0004 * This file is part of the KD Chart library. 0005 * 0006 * This program is free software; you can redistribute it and/or 0007 * modify it under the terms of the GNU General Public License as 0008 * published by the Free Software Foundation; either version 2 of 0009 * the License, or (at your option) any later version. 0010 * 0011 * This program is distributed in the hope that it will be useful, 0012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 0013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 0014 * GNU General Public License for more details. 0015 * 0016 * You should have received a copy of the GNU General Public License 0017 * along with this program. If not, see <https://www.gnu.org/licenses/>. 0018 */ 0019 0020 #ifndef __KCHART_PALETTE_H__ 0021 #define __KCHART_PALETTE_H__ 0022 0023 #include <QObject> 0024 #include <QBrush> 0025 #include "KChartGlobal.h" 0026 0027 namespace KChart { 0028 0029 /** 0030 * \brief A Palette is a set of brushes (or colors) to be used 0031 * for painting data sets. 0032 * 0033 * The palette class encapsulates a colletion of brushes, which in 0034 * the simplest case are colors, to be used for painting a series of 0035 * data sets. When asked for the m-th color, a palette of size n will 0036 * wrap around and thus cycle through the available colors. 0037 * 0038 * Three builtin palettes are provided for convenience, one with a default 0039 * set of colors, one with a subdued color selection, one with rainbow 0040 * colors. 0041 * 0042 * When a palette changes, it emits a changed() signal. Hook up to it, if 0043 * you want to repaint when the color selection changes. 0044 */ 0045 0046 class KCHART_EXPORT Palette: public QObject 0047 { 0048 Q_OBJECT 0049 public: 0050 explicit Palette( QObject *parent = nullptr ); 0051 Palette( const Palette& ); 0052 Palette &operator= ( const Palette & ); 0053 0054 ~Palette(); 0055 0056 /** Provide access to the three builtin palettes, one with standard bright 0057 * colors, one with more subdued colors, and one with rainbow colors. */ 0058 static const Palette& defaultPalette(); 0059 static const Palette& subduedPalette(); 0060 static const Palette& rainbowPalette(); 0061 0062 /** @return whether this represents a valid palette. For a palette to be 0063 * valid it needs to have at least one brush associated. */ 0064 bool isValid() const; 0065 0066 /** @return the number of brushed in the palette. */ 0067 int size() const; 0068 0069 /** Adds \a brush to the palette. If no \a position is specified, the 0070 * brush is appended. 0071 */ 0072 void addBrush( const QBrush & brush, int position = -1 ); 0073 0074 /** 0075 * Query the palette for a brush at the specified position. If the 0076 * position exceeds the size of the palette, it wraps around. 0077 */ 0078 QBrush getBrush( int position ) const; 0079 0080 /** Remove the brush at position \a position, if there is one. */ 0081 void removeBrush( int position ); 0082 0083 Q_SIGNALS: 0084 /** Emitted whenever the palette changes. Views listen to this and repaints. */ 0085 void changed(); 0086 0087 private: 0088 KCHART_DECLARE_PRIVATE_BASE_VALUE( Palette ) 0089 }; 0090 0091 } 0092 0093 KCHART_DECLARE_SWAP_SPECIALISATION( KChart::Palette ) 0094 0095 #endif