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qskFuzzyFllor/qskFuzzyCeil added

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This commit is contained in:
Uwe Rathmann 2021-05-26 13:06:50 +02:00
parent 0bcb308d1c
commit d07e5fcf3f
2 changed files with 36 additions and 8 deletions
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25
src/common/QskFunctions.cpp
View File

@ -22,6 +22,8 @@ QSK_QT_PRIVATE_END
#include <qpa/qplatformintegration.h>
#include <qpa/qplatformscreen.h>
#include <cmath>
template< class Rect, class Value >
static inline Rect qskAlignedRect( const Rect& outerRect,
Value width, Value height, Qt::Alignment alignment )
@ -193,3 +195,26 @@ QRect qskPlatformScreenGeometry( const QScreen* screen )
return screen->handle()->geometry();
}
/*
Due to the nature of floating point arithmetic
we might floor a value, that is already "aligned"
F.e static_cast< int >( 0.29 / 0.01 ) -> 28
*/
qreal qskFuzzyFloor( qreal value, qreal stepSize )
{
qreal v = std::floor( value / stepSize ) * stepSize;
if ( qFuzzyCompare( value - v, stepSize ) )
v = value;
return v;
}
qreal qskFuzzyCeil( qreal value, qreal stepSize )
{
qreal v = std::ceil( value / stepSize ) * stepSize;
if ( qFuzzyCompare( v - value, stepSize ) )
v = value;
return v;
}

19
src/common/QskFunctions.h
View File

@ -36,6 +36,15 @@ QSK_EXPORT QRectF qskValidOrEmptyInnerRect(
QSK_EXPORT qreal qskHorizontalAdvance( const QFont&, const QString& );
QSK_EXPORT qreal qskHorizontalAdvance( const QFontMetricsF&, const QString& );
inline QMarginsF qskMargins( const QRectF& rect, const QRectF& innerRect )
{
return QMarginsF(
innerRect.left() - rect.left(),
innerRect.top() - rect.top(),
rect.right() - innerRect.right(),
rect.bottom() - innerRect.bottom() );
}
inline bool qskFuzzyCompare( qreal value1, qreal value2 )
{
if ( qFuzzyIsNull( value1 ) )
@ -47,13 +56,7 @@ inline bool qskFuzzyCompare( qreal value1, qreal value2 )
return qFuzzyCompare( value1, value2 );
}
inline QMarginsF qskMargins( const QRectF& rect, const QRectF& innerRect )
{
return QMarginsF(
innerRect.left() - rect.left(),
innerRect.top() - rect.top(),
rect.right() - innerRect.right(),
rect.bottom() - innerRect.bottom() );
}
QSK_EXPORT qreal qskFuzzyFloor( qreal value, qreal stepSize );
QSK_EXPORT qreal qskFuzzyCeil( qreal value, qreal stepSize );
#endif