void ImageView::doScale(qreal factor)
{
qreal currentScale = transform().m11();
qreal newScale = currentScale * factor;
qreal actualFactor = factor;
// cap to 0.001 - 1000
if (newScale > 1000)
actualFactor = 1000./currentScale;
else if (newScale < 0.001)
actualFactor = 0.001/currentScale;
scale(actualFactor, actualFactor);
emitScaleFactor();
}
void ImageView::fitToScreen()
{
fitInView(d->imageItem, Qt::KeepAspectRatio);
emitScaleFactor();
}
void ImageView::resetToOriginalSize()
{
resetTransform();
emitScaleFactor();
}
void ImageView::doScale(qreal factor)
{
scale(factor, factor);
emitScaleFactor();
}
bool ImageView::openFile(QString fileName)
{
#ifndef QT_NO_SVG
bool isSvg = false;
#endif
QByteArray format = QImageReader::imageFormat(fileName);
// if it is impossible to recognize a file format - file will not be open correctly
if (format.isEmpty())
return false;
#ifndef QT_NO_SVG
if (format.startsWith("svg"))
isSvg = true;
#endif
QGraphicsScene *s = scene();
bool drawBackground = (d->backgroundItem ? d->backgroundItem->isVisible() : false);
bool drawOutline = (d->outlineItem ? d->outlineItem->isVisible() : true);
s->clear();
resetTransform();
// image
#ifndef QT_NO_SVG
if (isSvg) {
d->imageItem = new QGraphicsSvgItem(fileName);
} else
#endif
{
QPixmap pixmap(fileName);
QGraphicsPixmapItem *pixmapItem = new QGraphicsPixmapItem(pixmap);
pixmapItem->setTransformationMode(Qt::SmoothTransformation);
d->imageItem = pixmapItem;
}
d->imageItem->setCacheMode(QGraphicsItem::NoCache);
d->imageItem->setZValue(0);
// background item
d->backgroundItem = new QGraphicsRectItem(d->imageItem->boundingRect());
d->backgroundItem->setBrush(Qt::white);
d->backgroundItem->setPen(Qt::NoPen);
d->backgroundItem->setVisible(drawBackground);
d->backgroundItem->setZValue(-1);
// outline
d->outlineItem = new QGraphicsRectItem(d->imageItem->boundingRect());
QPen outline(Qt::black, 1, Qt::DashLine);
outline.setCosmetic(true);
d->outlineItem->setPen(outline);
d->outlineItem->setBrush(Qt::NoBrush);
d->outlineItem->setVisible(drawOutline);
d->outlineItem->setZValue(1);
s->addItem(d->backgroundItem);
s->addItem(d->imageItem);
s->addItem(d->outlineItem);
// if image size is 0x0, then it is not loaded
if (d->imageItem->boundingRect().height() == 0 && d->imageItem->boundingRect().width() == 0)
return false;
emitScaleFactor();
return true;
}
