Qt Reference Documentation

vibrationsurface.cpp Example File

widgets/symbianvibration/vibrationsurface.cpp
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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;
     }
 }