mandelbrotwidget.h Example File

  /****************************************************************************
  **
  ** Copyright (C) 2016 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 MANDELBROTWIDGET_H
  #define MANDELBROTWIDGET_H

  #include <QPixmap>
  #include <QWidget>
  #include "renderthread.h"

  class MandelbrotWidget : public QWidget
  {
      Q_OBJECT

  public:
      MandelbrotWidget(QWidget *parent = 0);

  protected:
      void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
      void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE;
      void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE;
  #ifndef QT_NO_WHEELEVENT
      void wheelEvent(QWheelEvent *event) Q_DECL_OVERRIDE;
  #endif
      void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
      void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
      void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;

  private slots:
      void updatePixmap(const QImage &image, double scaleFactor);
      void zoom(double zoomFactor);

  private:
      void scroll(int deltaX, int deltaY);

      RenderThread thread;
      QPixmap pixmap;
      QPoint pixmapOffset;
      QPoint lastDragPos;
      double centerX;
      double centerY;
      double pixmapScale;
      double curScale;
  };

  #endif // MANDELBROTWIDGET_H