TechDraw: SVG export refactoring - Keep correct font sizes

src/Mod/TechDraw/Gui/QGIHighlight.cpp

@@ -84,7 +84,7 @@ void QGIHighlight::makeHighlight()
 void QGIHighlight::makeReference()
 {
     prepareGeometryChange();
-    m_refFont.setPointSizeF(QGIView::calculateFontPointSizeF(this, m_refSize));
+    m_refFont.setPixelSize(QGIView::calculateFontPixelSize(m_refSize));
     m_reference->setFont(m_refFont);
     m_reference->setPlainText(QString::fromUtf8(m_refText));
     double fudge = Rez::guiX(1.0);

src/Mod/TechDraw/Gui/QGISVGTemplate.h

@@ -54,6 +54,8 @@ public:
     void draw();
     virtual void updateView(bool update = false);
 
+    TechDraw::DrawSVGTemplate *getSVGTemplate();
+
 protected:
     void openFile(const QFile &file);
     void load (const QString & fileName);
@@ -61,7 +63,6 @@ protected:
 
 protected:
     bool firstTime;
-    TechDraw::DrawSVGTemplate * getSVGTemplate();
     QGraphicsSvgItem *m_svgItem;
     QSvgRenderer *m_svgRender;
     virtual QVariant itemChange(GraphicsItemChange change, const QVariant &value);

src/Mod/TechDraw/Gui/QGISectionLine.cpp

@@ -195,7 +195,7 @@ void QGISectionLine::makeSymbolsTrad()
     extLineStart = m_start + offset;
     extLineEnd = m_end + offset;
     prepareGeometryChange();
-    m_symFont.setPointSizeF(QGIView::calculateFontPointSizeF(this, m_symSize));
+    m_symFont.setPixelSize(QGIView::calculateFontPixelSize(m_symSize));
     m_symbol1->setFont(m_symFont);
     m_symbol1->setPlainText(QString::fromUtf8(m_symbol));
     if (m_arrowDir.y < 0.0) {         //pointing down
@@ -238,7 +238,7 @@ void QGISectionLine::makeSymbolsISO()
     symPosEnd = m_end - offset;
 
     prepareGeometryChange();
-    m_symFont.setPointSizeF(QGIView::calculateFontPointSizeF(this, m_symSize));
+    m_symFont.setPixelSize(QGIView::calculateFontPixelSize(m_symSize));
     m_symbol1->setFont(m_symFont);
     m_symbol1->setPlainText(QString::fromUtf8(m_symbol));
     m_symbol1->centerAt(symPosStart);

src/Mod/TechDraw/Gui/QGIView.cpp

@@ -96,7 +96,7 @@ QGIView::QGIView()
     m_pen.setColor(m_colCurrent);
 
     //Border/Label styling
-    m_font.setPointSizeF(calculateFontPointSizeF(getPrefFontSize()));
+    m_font.setPixelSize(calculateFontPixelSize(getPrefFontSize()));
 
     m_decorPen.setStyle(Qt::DashLine);
     m_decorPen.setWidth(0); // 0 => 1px "cosmetic pen"
@@ -428,7 +428,7 @@ void QGIView::drawCaption()
     QRectF displayArea = customChildrenBoundingRect();
     m_caption->setDefaultTextColor(m_colCurrent);
     m_font.setFamily(getPrefFont());
-    m_font.setPointSizeF(calculateFontPointSizeF(getPrefFontSize()));
+    m_font.setPixelSize(calculateFontPixelSize(getPrefFontSize()));
     m_caption->setFont(m_font);
     QString captionStr = QString::fromUtf8(getViewObject()->Caption.getValue());
     m_caption->setPlainText(captionStr);
@@ -469,7 +469,7 @@ void QGIView::drawBorder()
 
     m_label->setDefaultTextColor(m_colCurrent);
     m_font.setFamily(getPrefFont());
-    m_font.setPointSizeF(calculateFontPointSizeF(getPrefFontSize()));
+    m_font.setPixelSize(calculateFontPixelSize(getPrefFontSize()));
 
     m_label->setFont(m_font);
     QString labelStr = QString::fromUtf8(getViewObject()->Label.getValue());
@@ -686,30 +686,11 @@ double QGIView::getDimFontSize()
     return hGrp->GetFloat("FontSize", DefaultFontSizeInMM);
 }
 
-double QGIView::calculateFontPointSizeF(const QGraphicsItem *item, double sizeInMillimetres)
+int QGIView::calculateFontPixelSize(double sizeInMillimetres)
 {
-    const QWidget *widget = MDIViewPage::getFromScene(item->scene());
-    if (widget == nullptr && !QApplication::topLevelWidgets().isEmpty()) {
-        // Fallback to some top level window if we are not assigned to a scene/widget yet
-        widget = QApplication::topLevelWidgets().first();
-    }
-
-    double logicalDPI = 96.0; // This is the most common value in PC world
-    if (widget != nullptr) {
-        logicalDPI = widget->logicalDpiY();
-    }
-
-    // Now calculate the correct font size to be used by a QGraphicsTextItem:
-    // 1) Start with font size in mm.
-    // 2) Convert it to "pixels" via Rex::GuiX().
-    // 3) Convert "pixels" to inches dividing them by DPI.
-    // 4) Convert inches to points - there are exactly 72 points to one inch.
-    return 72.0*Rez::guiX(sizeInMillimetres)/logicalDPI;
-}
-
-double QGIView::calculateFontPointSizeF(double sizeInMillimetres) const
-{
-    return calculateFontPointSizeF(this, sizeInMillimetres);
+    // Calculate font size in pixels by using resolution conversion
+    // and round to nearest integer
+    return (int) (Rez::guiX(sizeInMillimetres) + 0.5);
 }
 
 const double QGIView::DefaultFontSizeInMM = 5.0;

src/Mod/TechDraw/Gui/QGIView.h

@@ -111,7 +111,7 @@ public:
     
     static Gui::ViewProvider* getViewProvider(App::DocumentObject* obj);
     static QGVPage* getGraphicsView(TechDraw::DrawView* dv);
-    static double calculateFontPointSizeF(const QGraphicsItem *graphicsItem, double sizeInMillimetres);
+    static int calculateFontPixelSize(double sizeInMillimetres);
     static const double DefaultFontSizeInMM;
 
     MDIViewPage* getMDIViewPage(void) const;
@@ -138,7 +138,6 @@ protected:
     QString getPrefFont(void);
     double getPrefFontSize(void);
     double getDimFontSize(void);
-    double calculateFontPointSizeF(double sizeInMillimetres) const;
 
     Base::Reference<ParameterGrp> getParmGroupCol(void);
 

src/Mod/TechDraw/Gui/QGIViewBalloon.cpp

@@ -181,7 +181,7 @@ void QGIViewBalloon::placeBalloon(QPointF pos)
         balloon->Text.setValue(std::to_string(idx).c_str());
      
         QFont font = balloonLabel->getFont();
-        font.setPointSizeF(calculateFontPointSizeF(vp->Fontsize.getValue()));
+        font.setPixelSize(calculateFontPixelSize(vp->Fontsize.getValue()));
         font.setFamily(QString::fromUtf8(vp->Font.getValue()));
         balloonLabel->setFont(font);
         prepareGeometryChange();
@@ -263,7 +263,7 @@ void QGIViewBalloon::updateBalloon(bool obtuse)
     }
 
     QFont font = balloonLabel->getFont();
-    font.setPointSizeF(calculateFontPointSizeF(vp->Fontsize.getValue()));
+    font.setPixelSize(calculateFontPixelSize(vp->Fontsize.getValue()));
     font.setFamily(QString::fromUtf8(vp->Font.getValue()));
     balloonLabel->setFont(font);
 

src/Mod/TechDraw/Gui/QGIViewDimension.cpp

@@ -208,9 +208,9 @@ void QGIDatumLabel::setFont(QFont f)
 {
     m_dimText->setFont(f);
     QFont tFont(f);
-    double fontSize = f.pointSizeF();
+    double fontSize = f.pixelSize();
     double tolAdj = getTolAdjust();
-    tFont.setPointSizeF(fontSize * tolAdj);
+    tFont.setPixelSize((int) (fontSize * tolAdj));
     m_tolText->setFont(tFont);
 }
 
@@ -481,7 +481,7 @@ void QGIViewDimension::updateDim(bool obtuse)
     
     QFont font = datumLabel->getFont();
     font.setFamily(QString::fromUtf8(vp->Font.getValue()));
-    font.setPointSizeF(calculateFontPointSizeF(this, vp->Fontsize.getValue()));
+    font.setPixelSize(calculateFontPixelSize(vp->Fontsize.getValue()));
     datumLabel->setFont(font);
 
     prepareGeometryChange();