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# vibrationsurface.cpp Example File

widgets/symbianvibration/vibrationsurface.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the QtCore module of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** 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 Digia Plc and its Subsidiary(-ies) nor the names
     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     #include "vibrationsurface.h"
     #include <QtGui/QPainter>
     #include <QtCore/QLine>
     #include <QtGui/QMouseEvent>
     #include <QtGui/QScreen>
     #include <QtCore/QRect>
     #include <QtGui/QColor>

     #include "xqvibra.h"

     const int NumberOfLevels = 10;
     const double IntensityFactor = XQVibra::MaxIntensity / NumberOfLevels;

     VibrationSurface::VibrationSurface(XQVibra *vibra, QWidget *parent) :
         QWidget(parent),
         vibra(vibra),
         lastIntensity(0)
     {
     }

     void VibrationSurface::mousePressEvent(QMouseEvent *event)
     {
         applyIntensity(event->x(), event->y());
         vibra->start();
     }

     void VibrationSurface::mouseMoveEvent(QMouseEvent *event)
     {
         applyIntensity(event->x(), event->y());
     }

     void VibrationSurface::mouseReleaseEvent(QMouseEvent *)
     {
         vibra->stop();
     }

     void VibrationSurface::paintEvent(QPaintEvent *)
     {
         QPainter painter(this);
         QRect rect = geometry();
         int dx = 0, dy = 0;

         if (height() > width()) {
             dy = height() / NumberOfLevels;
             rect.setHeight(dy);
         } else {
             dx = width() / NumberOfLevels;
             rect.setWidth(dx);
         }
         for (int i = 0; i < NumberOfLevels; i++) {
             int x = i * dx;
             int y = i * dy;
             int intensity = getIntensity(x, y);
             QColor color = QColor(40, 80, 10).lighter(100 + intensity);

             rect.moveTo(x, y);
             painter.fillRect(rect, color);
             painter.setPen(color.darker());
             painter.drawText(rect, Qt::AlignCenter, QString::number(intensity));
         }
     }

     int VibrationSurface::getIntensity(int x, int y)
     {
         int level;
         int coord;

         if (height() > width()) {
             level = height() / NumberOfLevels;
             coord = y;
         } else {
             level = width() / NumberOfLevels;
             coord = x;
         }

         if (level == 0) {
             return 0;
         }
         int intensity = (coord / level + 1) * IntensityFactor;

         if (intensity < 0) {
             intensity = 0;
         } else if (intensity > XQVibra::MaxIntensity) {
             intensity = XQVibra::MaxIntensity;
         }

         return intensity;
     }

     void VibrationSurface::applyIntensity(int x, int y)
     {
         int intensity = getIntensity(x, y);

         if (intensity != lastIntensity) {
             vibra->setIntensity(intensity);
             lastIntensity = intensity;
         }
     }