diff --git a/src/common/QskArcMetrics.cpp b/src/common/QskArcMetrics.cpp
new file mode 100644
index 00000000..86911328
--- /dev/null
+++ b/src/common/QskArcMetrics.cpp
@@ -0,0 +1,68 @@
+/******************************************************************************
+ * QSkinny - Copyright (C) 2016 Uwe Rathmann
+ * This file may be used under the terms of the QSkinny License, Version 1.0
+ *****************************************************************************/
+
+#include "QskArcMetrics.h"
+
+#include <qhashfunctions.h>
+#include <qvariant.h>
+
+static void qskRegisterArcMetrics()
+{
+    qRegisterMetaType< QskArcMetrics >();
+}
+
+Q_CONSTRUCTOR_FUNCTION( qskRegisterArcMetrics )
+
+void QskArcMetrics::setSizeMode( Qt::SizeMode sizeMode ) noexcept
+{
+    m_sizeMode = sizeMode;
+}
+
+void QskArcMetrics::setStartAngle( qreal angle ) noexcept
+{
+    m_startAngle = angle;
+}
+
+void QskArcMetrics::setEndAngle( qreal angle ) noexcept
+{
+    m_endAngle = angle;
+}
+
+void QskArcMetrics::setWidth( qreal width ) noexcept
+{
+    m_width = width;
+}
+
+uint QskArcMetrics::hash( uint seed ) const noexcept
+{
+    uint hash = qHash( m_startAngle, seed );
+    hash = qHash( m_endAngle, hash );
+    hash = qHash( m_width, hash );
+    const int mode = m_sizeMode;
+    return qHashBits( &mode, sizeof( mode ), hash );
+}
+
+#ifndef QT_NO_DEBUG_STREAM
+
+#include <qdebug.h>
+
+QDebug operator<<( QDebug debug, const QskArcMetrics& metrics )
+{
+    QDebugStateSaver saver( debug );
+    debug.nospace();
+
+    debug << "Arc" << '(';
+    debug << "start angle:" << metrics.startAngle();
+    debug << ", end angle:" << metrics.endAngle();
+    debug << ", size mode:" << metrics.sizeMode();
+    debug << ", width:" << metrics.width();
+    debug << ')';
+
+    return debug;
+}
+
+#endif
+
+#include "moc_QskArcMetrics.cpp"
diff --git a/src/common/QskArcMetrics.h b/src/common/QskArcMetrics.h
new file mode 100644
index 00000000..3cc4cdca
--- /dev/null
+++ b/src/common/QskArcMetrics.h
@@ -0,0 +1,116 @@
+/******************************************************************************
+ * QSkinny - Copyright (C) 2016 Uwe Rathmann
+ * This file may be used under the terms of the QSkinny License, Version 1.0
+ *****************************************************************************/
+
+#ifndef QSK_ARC_METRICS_H
+#define QSK_ARC_METRICS_H
+
+#include "QskFunctions.h"
+
+#include <qmetatype.h>
+
+class QVariant;
+
+class QSK_EXPORT QskArcMetrics
+{
+    Q_GADGET
+
+    Q_PROPERTY( QskMargins widths READ widths WRITE setWidths )
+    Q_PROPERTY( Qt::SizeMode sizeMode READ sizeMode WRITE setSizeMode )
+
+  public:
+    constexpr QskArcMetrics() noexcept;
+
+    constexpr QskArcMetrics( qreal startAngle, qreal endAngle,
+        qreal width, Qt::SizeMode = Qt::AbsoluteSize ) noexcept;
+
+    constexpr bool operator==( const QskArcMetrics& ) const noexcept;
+    constexpr bool operator!=( const QskArcMetrics& ) const noexcept;
+
+    constexpr bool isNull() const noexcept;
+
+    void setStartAngle( qreal ) noexcept;
+    constexpr qreal startAngle() const noexcept;
+    void setEndAngle( qreal ) noexcept;
+    constexpr qreal endAngle() const noexcept;
+
+    void setWidth( qreal width ) noexcept;
+    constexpr qreal width() const noexcept;
+
+    void setSizeMode( Qt::SizeMode ) noexcept;
+    constexpr Qt::SizeMode sizeMode() const noexcept;
+
+    uint hash( uint seed = 0 ) const noexcept;
+
+    static QVariant interpolate( const QskArcMetrics&,
+        const QskArcMetrics&, qreal progress );
+
+  private:
+    qreal m_startAngle;
+    qreal m_endAngle;
+    qreal m_width;
+    Qt::SizeMode m_sizeMode;
+};
+
+inline constexpr QskArcMetrics::QskArcMetrics() noexcept
+    : m_startAngle( 0 )
+    , m_endAngle( 0 )
+    , m_width( 0 )
+    , m_sizeMode( Qt::AbsoluteSize )
+{
+}
+
+inline constexpr QskArcMetrics::QskArcMetrics( qreal startAngle, qreal endAngle,
+    qreal width, Qt::SizeMode sizeMode ) noexcept
+    : m_startAngle( startAngle )
+    , m_endAngle( endAngle )
+    , m_width( width )
+    , m_sizeMode( sizeMode )
+{
+}
+
+inline constexpr bool QskArcMetrics::operator==(
+    const QskArcMetrics& other ) const noexcept
+{
+    return ( qskFuzzyCompare( m_startAngle, other.m_startAngle )
+             && qskFuzzyCompare( m_endAngle, other.m_endAngle )
+             && qskFuzzyCompare( m_width, other.m_width )
+             && m_sizeMode == other.m_sizeMode );
+}
+
+inline constexpr bool QskArcMetrics::operator!=(
+    const QskArcMetrics& other ) const noexcept
+{
+    return !( *this == other );
+}
+
+inline constexpr bool QskArcMetrics::isNull() const noexcept
+{
+    return qFuzzyIsNull( m_startAngle )
+            && qFuzzyIsNull( m_endAngle )
+            && qFuzzyIsNull( m_width )
+            && m_sizeMode == Qt::AbsoluteSize;
+}
+
+inline constexpr qreal QskArcMetrics::width() const noexcept
+{
+    return m_width;
+}
+
+inline constexpr Qt::SizeMode QskArcMetrics::sizeMode() const noexcept
+{
+    return m_sizeMode;
+}
+
+#ifndef QT_NO_DEBUG_STREAM
+
+class QDebug;
+QSK_EXPORT QDebug operator<<( QDebug, const QskArcMetrics& );
+
+#endif
+
+Q_DECLARE_TYPEINFO( QskArcMetrics, Q_MOVABLE_TYPE );
+Q_DECLARE_METATYPE( QskArcMetrics )
+
+#endif
diff --git a/src/src.pro b/src/src.pro
index 9912d316..06f567a4 100644
--- a/src/src.pro
+++ b/src/src.pro
@@ -12,6 +12,7 @@ DEPENDPATH *= $${QSK_SUBDIRS}
 # DEFINES += QSK_LAYOUT_COMPAT
 
 HEADERS += \
+    common/QskArcMetrics.h \
     common/QskAspect.h \
     common/QskBoxBorderColors.h \
     common/QskBoxBorderMetrics.h \
@@ -38,6 +39,7 @@ HEADERS += \
     common/QskTextOptions.h
 
 SOURCES += \
+    common/QskArcMetrics.cpp \
     common/QskAspect.cpp \
     common/QskBoxBorderColors.cpp \
     common/QskBoxBorderMetrics.cpp \