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QskLinearDirection::valueAt added

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This commit is contained in:
Uwe Rathmann 2023-01-24 19:40:41 +01:00
parent 07da205dc0
commit c384fd608d
1 changed files with 23 additions and 2 deletions
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25
src/common/QskGradientDirection.h
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@ -68,6 +68,17 @@ class QSK_EXPORT QskLinearDirection
constexpr qreal y2() const noexcept;
void setY2( qreal ) noexcept;
/*
In direction of the gradient vector, where 0.0 corresponds to
points on the perpendicular at the start and 1.0 to points on
the perpendicular of the end point ( normalized projection ).
Also corresponds to the positions of the color stops and can be
used it calculate the color at a specific position.
*/
qreal valueAt( const QPointF& ) const;
qreal valueAt( qreal x, qreal y ) const;
bool contains( const QRectF& ) const;
private:
@ -226,8 +237,7 @@ inline constexpr QPointF QskLinearDirection::stop() const noexcept
inline constexpr bool QskLinearDirection::isOriented(
Qt::Orientation orientation ) const noexcept
{
return ( orientation == Qt::Horizontal )
? isHorizontal() : isVertical();
return ( orientation == Qt::Horizontal ) ? isHorizontal() : isVertical();
}
inline constexpr bool QskLinearDirection::isHorizontal() const noexcept
@ -245,6 +255,17 @@ inline constexpr bool QskLinearDirection::isTilted() const noexcept
return ( m_x1 != m_x2 ) && ( m_y1 != m_y2 );
}
inline qreal QskLinearDirection::valueAt( const QPointF& pos ) const
{
return valueAt( pos.x(), pos.y() );
}
inline qreal QskLinearDirection::valueAt( qreal x, qreal y ) const
{
const qreal d = ( m_x2 - m_x1 ) * ( m_y2 - m_y1 );
return ( ( x - m_x1 ) * ( y - m_y1 ) + d ) / ( d + d );
}
inline constexpr QskConicDirection::QskConicDirection(
qreal x, qreal y, qreal startAngle ) noexcept
: QskConicDirection( x, y, startAngle, 360.0 )