QskInterval::center(), QskInterval::stretch removed as they the

implementation is only handling normalized intervals

src/common/QskIntervalF.h

@@ -36,8 +36,6 @@ class QSK_EXPORT QskIntervalF
     constexpr qreal upperBound() const noexcept;
     void setUpperBound( qreal ) noexcept;
 
-    constexpr qreal center() const noexcept;
-
     void spanFromLowerBound( qreal ) noexcept;
     void spanFromUpperBound( qreal ) noexcept;
 
@@ -68,9 +66,6 @@ class QSK_EXPORT QskIntervalF
     void extend( qreal value ) noexcept;
     QskIntervalF extended( qreal value ) const noexcept;
 
-    void stretch( qreal length ) noexcept;
-    constexpr QskIntervalF stretched( qreal length ) const noexcept;
-
     QskIntervalF operator|( const QskIntervalF& ) const noexcept;
     QskIntervalF operator&( const QskIntervalF& ) const noexcept;
 
@@ -140,11 +135,6 @@ inline constexpr qreal QskIntervalF::upperBound() const noexcept
     return m_upperBound;
 }
 
-inline constexpr qreal QskIntervalF::center() const noexcept
-{
-    return m_lowerBound + 0.5 * ( m_upperBound - m_lowerBound );
-}
-
 inline constexpr qreal QskIntervalF::length() const noexcept
 {
     return ( m_upperBound > m_lowerBound ) ? ( m_upperBound - m_lowerBound ) : 0.0;
@@ -208,18 +198,6 @@ inline constexpr QskIntervalF QskIntervalF::normalized( qreal value1, qreal valu
     return ( value1 < value2 ) ? QskIntervalF( value1, value2 ) : QskIntervalF( value2, value1 );
 }
 
-inline void QskIntervalF::stretch( qreal length ) noexcept
-{
-    m_lowerBound = center() - 0.5 * length;
-    m_upperBound = m_lowerBound + length;
-}
-
-inline constexpr QskIntervalF QskIntervalF::stretched( qreal length ) const noexcept
-{
-    const auto lowerBound = center() - 0.5 * length;
-    return QskIntervalF( lowerBound, lowerBound + length );
-}
-
 inline QskIntervalF QskIntervalF::operator&( const QskIntervalF& other ) const noexcept
 {
     return intersected( other );

src/controls/QskSliderSkinlet.cpp

@@ -6,9 +6,9 @@
 #include "QskSliderSkinlet.h"
 #include "QskSlider.h"
 #include "QskFunctions.h"
-#include "QskIntervalF.h"
 
 #include <qvector.h>
+#include <qpair.h>
 #include <qmath.h>
 
 // the color of graduation ticks might different, when being on top of the filling
@@ -65,6 +65,19 @@ static inline bool qskHasGraduation( const QskSlider* slider )
     return false;
 }
 
+static inline QPair< qreal, qreal > qskTickSpan( qreal min, qreal max, qreal length )
+{
+    if ( length >= 0.0 )
+    {
+        // using the center of [min,max]
+        min += 0.5 * ( max - min - length );
+        max = min + length;
+    }
+
+    return { min, max };
+}
+
+
 QskSliderSkinlet::QskSliderSkinlet( QskSkin* skin )
     : Inherited( skin )
 {
@@ -285,23 +298,21 @@ QRectF QskSliderSkinlet::tickRect( const QskSlider* slider,
     {
         const auto x = tickPos * r.width() - 0.5 * size.width();
 
-        QskIntervalF intv( padding.top(), r.height() - padding.bottom() );
+        const auto span = qskTickSpan(
-        if ( size.height() >= 0.0 )
+            padding.top(), r.height() - padding.bottom(), size.height() );
-            intv.stretch( size.height() );
 
-        return QRectF( r.x() + x, r.y() + intv.lowerBound(),
+        return QRectF( r.x() + x, r.y() + span.first,
-            size.width(), intv.length() );
+            size.width(), span.second - span.first );
     }
     else
     {
         const auto y = tickPos * r.height() + 0.5 * size.height();
 
-        QskIntervalF intv( padding.left(), r.width() - padding.right() );
+        const auto span = qskTickSpan(
-        if ( size.width() >= 0.0 )
+            padding.left(), r.width() - padding.right(), size.width() );
-            intv.stretch( size.width() );
 
-        return QRectF( r.x() + intv.lowerBound(), r.bottom() - y,
+        return QRectF( r.x() + span.first, r.bottom() - y,
-            intv.length(), size.height() );
+            span.second - span.first, size.height() );
     }
 }