fixed issue with ruler and compass. They show now the correct radius information

src/frameworks/UBFileSystemUtils.cpp

@@ -397,7 +397,6 @@ QString UBFileSystemUtils::lastPathComponent(const QString& path)
 
 QString UBFileSystemUtils::mimeTypeFromFileName(const QString& fileName)
 {
-    Q_ASSERT(fileName.length());
     QString ext = extension(fileName);
 
     if (ext == "xls" || ext == "xlsx") return "application/msexcel";

src/tools/UBGraphicsCompass.cpp

@@ -51,6 +51,13 @@ UBGraphicsCompass::UBGraphicsCompass()
     , mDrewCenterCross(false)
 {
     setRect(sDefaultRect);
+    setBrush(QBrush(Qt::red));
+
+    //TODO claudio: remove code duplication
+    QDesktopWidget* desktop = UBApplication::desktop();
+    int dpiCommon = (desktop->physicalDpiX() + desktop->physicalDpiY()) / 2;
+    mPixelsPerMillimeter = qRound(dpiCommon / 25.4f);
+
     setFlag(QGraphicsItem::ItemIsMovable, true);
     setFlag(QGraphicsItem::ItemIsSelectable, true);
     setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
@@ -399,7 +406,7 @@ void UBGraphicsCompass::paintAngleDisplay(QPainter *painter)
 
 void UBGraphicsCompass::paintRadiusDisplay(QPainter *painter)
 {
-    qreal radiusInCentimeters = rect().width() / (sPixelsPerMillimeter * 10);
+    qreal radiusInCentimeters = rect().width() / (mPixelsPerMillimeter * 10);
     QString format = rect().width() >= sDisplayRadiusUnitMinLength ? "%1 cm" : "%1";
     QString radiusText = QString(format).arg(radiusInCentimeters, 0, 'f', 1);
 

src/tools/UBGraphicsCompass.h

@@ -113,6 +113,7 @@ class UBGraphicsCompass: public QObject, public QGraphicsRectItem, public UBItem
         QGraphicsSvgItem* mResizeSvgItem;
         qreal mAntiScaleRatio;
         bool mDrewCenterCross;
+        int mPixelsPerMillimeter;
 
         // Constants
         static const QRect                     sDefaultRect;
@@ -130,7 +131,6 @@ class UBGraphicsCompass: public QObject, public QGraphicsRectItem, public UBItem
         static const QColor    sDarkBackgroundEdgeFillColor;
         static const QColor  sDarkBackgroundMiddleFillColor;
         static const QColor        sDarkBackgroundDrawColor;
-        static const int               sPixelsPerMillimeter = 5;
         static const int sDisplayRadiusOnPencilArmMinLength = 300;
         static const int        sDisplayRadiusUnitMinLength = 250;
 };

src/tools/UBGraphicsRuler.cpp

@@ -164,6 +164,9 @@ void UBGraphicsRuler::paintGraduations(QPainter *painter)
     const int       millimetersPerCentimeter = 10;
     const int   millimetersPerHalfCentimeter = 5;
 
+
+    qDebug() << sPixelsPerMillimeter;
+
     painter->save();
     painter->setFont(font());
     QFontMetricsF fontMetrics(painter->font());