/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef GRADIENTTEXTURE_H
#define GRADIENTTEXTURE_H

#include <QtQuick3D/QQuick3DTextureData>

#include <QtGui/QColor>

//! [class definition]
class GradientTexture : public QQuick3DTextureData
{
    Q_OBJECT
    Q_PROPERTY(int height READ height WRITE setHeight NOTIFY heightChanged)
    Q_PROPERTY(int width READ width WRITE setWidth NOTIFY widthChanged)
    Q_PROPERTY(QColor startColor READ startColor WRITE setStartColor NOTIFY startColorChanged)
    Q_PROPERTY(QColor endColor READ endColor WRITE setEndColor NOTIFY endColorChanged)
    QML_NAMED_ELEMENT(GradientTexture)
    //! [class definition]

public:
    GradientTexture();

    int height() const;
    int width() const;
    QColor startColor() const;
    QColor endColor() const;

public Q_SLOTS:
    void setHeight(int height);
    void setWidth(int width);
    void setStartColor(QColor startColor);
    void setEndColor(QColor endColor);

Q_SIGNALS:
    void heightChanged(int height);
    void widthChanged(int width);
    void startColorChanged(QColor startColor);
    void endColorChanged(QColor endColor);

private:
    void updateTexture();
    QByteArray generateTexture();

    static QColor linearInterpolate(const QColor &color1, const QColor &color2, float value);

    int m_height = 256;
    int m_width = 256;
    QColor m_startColor = QColor(QStringLiteral("#d4fc79"));
    QColor m_endColor = QColor(QStringLiteral("#96e6a1"));
};

#endif // GRADIENTTEXTURE_H
