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Issue #59: Use optionally logical pixels when zooming

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This commit is contained in:
Jakub Melka
2023-07-13 20:14:52 +02:00
parent aec5483690
commit fe1bf16597
4 changed files with 67 additions and 32 deletions
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17
Pdf4QtLib/sources/pdfdrawspacecontroller.cpp
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@ -29,6 +29,8 @@
#include <QTimer>
#include <QPainter>
#include <QFontMetrics>
#include <QScreen>
#include <QGuiApplication>
namespace pdf
{
@ -535,10 +537,23 @@ void PDFDrawWidgetProxy::update()
Q_ASSERT(m_verticalScrollbar);
QWidget* widget = m_widget->getDrawWidget()->getWidget();
QScreen* primaryScreen = QGuiApplication::primaryScreen();
// First, we must calculate pixel per mm ratio to obtain DPMM (device pixel per mm),
// we also assume, that zoom is correctly set.
m_pixelPerMM = static_cast<PDFReal>(widget->width()) / static_cast<PDFReal>(widget->widthMM());
QSizeF physicalSize = primaryScreen->physicalSize();
QSizeF pixelSize = primaryScreen->size();
m_pixelPerMM = pixelSize.width() / physicalSize.width();
// Are we using logical pixels instead of physical ones?
if (m_features.testFlag(PDFRenderer::LogicalSizeZooming))
{
qreal ldpi = primaryScreen->logicalDotsPerInch();
qreal pdpi = primaryScreen->physicalDotsPerInch();
qreal ratioLogicalToPhysical = ldpi / pdpi;
m_pixelPerMM *= ratioLogicalToPhysical;
}
Q_ASSERT(m_zoom > 0.0);
Q_ASSERT(m_pixelPerMM > 0.0);