qmapview.cpp

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#include "qmapview.h"
#include "qmapview.moc"


#include <QDebug>
#include <QGraphicsScene>
#include <QWheelEvent>

#include <math.h>

QMapView::QMapView()
{
        setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
        
         setCacheMode(CacheBackground);
         setRenderHint(QPainter::Antialiasing);
         setTransformationAnchor(AnchorUnderMouse);
         setResizeAnchor(AnchorViewCenter);

         scale(0.8, 0.8);
         setMinimumSize(400, 400);
         setWindowTitle(tr("QMapView"));
}

void QMapView::keyPressEvent(QKeyEvent *event)
{
         switch (event->key()) {
         case Qt::Key_Up:
                  break;
         case Qt::Key_Down:
                  break;
         case Qt::Key_Left:
                  break;
         case Qt::Key_Right:
                  break;
         case Qt::Key_Plus:
                  scaleView(1.2);
                  break;
         case Qt::Key_Minus:
                  scaleView(1 / 1.2);
                  break;
         case Qt::Key_Space:
         default:
                  QGraphicsView::keyPressEvent(event);
         }
}


void QMapView::wheelEvent(QWheelEvent *event)
{
         scaleView(pow((double)2, -event->delta() / 240.0));
}


void QMapView::scaleView(qreal scaleFactor)
{
         qreal factor = matrix().scale(scaleFactor, scaleFactor).mapRect(QRectF(0, 0, 1, 1)).width();
         if (factor < 0.07 || factor > 100)
                  return;

         scale(scaleFactor, scaleFactor);
}