src/klftools/qtcolortriangle.h

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/*
 * This file was very slightly modified by Philippe Faist for KLatexFormula. (april 2009)
 * In order for integration into KLatexFormula, this code is relicensed
 * to **GPL Version 2.1 or higher** as described in the footnote to the GPL
 * compatibility table found at
 *   http://www.gnu.org/licenses/gpl-faq.html#compat-matrix-footnote-7
 *
 */

/****************************************************************************
**
** This file is part of a Qt Solutions component.
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
** 
** Contact:  Qt Software Information (qt-info@nokia.com)
** 
** Commercial Usage  
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Solutions Commercial License Agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and Nokia.
** 
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
** 
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
** 
** GNU General Public License Usage 
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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** 
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****************************************************************************/

#ifndef QTCOLORTRIANGLE_H
#define QTCOLORTRIANGLE_H
#include <QImage>
#include <QWidget>

class QPointF;
struct Vertex;

#if defined(KLF_WS_WIN)
#  if !defined(QT_QTCOLORTRIANGLE_EXPORT) && !defined(QT_QTCOLORTRIANGLE_IMPORT)
#    define QT_QTCOLORTRIANGLE_EXPORT
#  elif defined(QT_QTCOLORTRIANGLE_IMPORT)
#    if defined(QT_QTCOLORTRIANGLE_EXPORT)
#      undef QT_QTCOLORTRIANGLE_EXPORT
#    endif
#    define QT_QTCOLORTRIANGLE_EXPORT __declspec(dllimport)
#  elif defined(QT_QTCOLORTRIANGLE_EXPORT)
#    undef QT_QTCOLORTRIANGLE_EXPORT
#    define QT_QTCOLORTRIANGLE_EXPORT __declspec(dllexport)
#  endif
#else
#  define QT_QTCOLORTRIANGLE_EXPORT
#endif

class QT_QTCOLORTRIANGLE_EXPORT QtColorTriangle : public QWidget
{
    Q_OBJECT

    Q_PROPERTY(QColor color READ color WRITE setColor)

public:
    QtColorTriangle(QWidget *parent = 0);
    ~QtColorTriangle();

    QSize sizeHint() const;
    int heightForWidth(int w) const;

    void polish();
    QColor color() const;

Q_SIGNALS:
    void colorChanged(const QColor &col);

public Q_SLOTS:
    void setColor(const QColor &col);

protected:
    void paintEvent(QPaintEvent *);
    void mouseMoveEvent(QMouseEvent *);
    void mousePressEvent(QMouseEvent *);
    void mouseReleaseEvent(QMouseEvent *);
    void keyPressEvent(QKeyEvent *e);
    void resizeEvent(QResizeEvent *);
    void drawTrigon(QImage *p, const QPointF &a, const QPointF &b,
                    const QPointF &c, const QColor &color);

  void internalSetNewColor(const QColor& color);

private:
    double radiusAt(const QPointF &pos, const QRect &rect) const;
    double angleAt(const QPointF &pos, const QRect &rect) const;
    QPointF movePointToTriangle(double x, double y, const Vertex &a,
                                    const Vertex &b, const Vertex &c) const;

    QPointF pointFromColor(const QColor &col) const;
    QColor colorFromPoint(const QPointF &p) const;

    void genBackground();

    QImage bg;
    double a, b, c;
    QPointF pa, pb, pc, pd;

    QColor curColor;
    int curHue;

    bool mustGenerateBackground;
    int penWidth;
    int ellipseSize;

    int outerRadius;
    QPointF selectorPos;

    enum SelectionMode {
        Idle,
        SelectingHue,
        SelectingSatValue
    } selMode;
};

#endif