GraphicsView.cpp
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#include "stdafx.h"
#include "GraphicsView.h"
//View
View::View(const QString& name, QWidget *parent)
: QFrame(parent)
{
//GraphicsView settings
graphicsView = new GraphicsView(this);
graphicsView->setDragMode(QGraphicsView::RubberBandDrag);
graphicsView->setOptimizationFlags(QGraphicsView::DontSavePainterState);
graphicsView->setViewportUpdateMode(QGraphicsView::SmartViewportUpdate);
graphicsView->setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
//layout
QGridLayout *topLayout = new QGridLayout;
topLayout->addWidget(graphicsView, 0, 0);
setLayout(topLayout);
setupMatrix();
}
QGraphicsView* View::view() const
{
return static_cast<QGraphicsView *>(graphicsView);
}
void View::setupMatrix()
{
qreal scale = qPow(qreal(1), qreal(1));
QMatrix matrix;
matrix.scale(scale, scale);
matrix.rotate(qreal(0));
graphicsView->setMatrix(matrix);
}
#ifndef QT_NO_WHEELEVENT
void GraphicsView::wheelEvent(QWheelEvent * event)
{
scaleView(pow((double)2, event->delta() / 240.0));
}
#endif
void GraphicsView::scaleView(qreal scaleFactor)
{
qreal factor = transform().scale(scaleFactor, scaleFactor).mapRect(QRectF(0, 0, 1, 1)).width();
if (factor < 0.07 || factor > 100)
return;
scale(scaleFactor, scaleFactor);
}