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interpolation between an invalid and a valid gradient

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This commit is contained in:
Uwe Rathmann 2018-12-22 16:12:45 +01:00
parent 775dca5792
commit 738695031b
1 changed files with 35 additions and 2 deletions
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37
src/common/QskGradient.cpp
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@ -360,7 +360,40 @@ QskGradient QskGradient::interpolated(
const QskGradient& to, qreal value ) const
{
if ( !( isValid() && to.isValid() ) )
return to;
{
if ( !isValid() && !to.isValid() )
return to;
qreal progress;
const QskGradient* gradient;
if ( to.isValid() )
{
progress = value;
gradient = &to;
}
else
{
progress = 1.0 - value;
gradient = this;
}
/*
We interpolate as if the invalid gradient would be
a transparent version of the valid gradient
*/
QVector< QskGradientStop > stops = gradient->m_stops;
for ( auto& stop : stops )
{
auto c = stop.color();
c.setAlpha( c.alpha() * progress );
stop.setColor( c );
}
return QskGradient( gradient->m_orientation, stops );
}
if ( qskIsMonochrome( m_stops ) )
{
@ -422,7 +455,7 @@ QskGradient QskGradient::interpolated(
{
/*
The interpolation is devided into 2 steps. First we
interpolate into a monochrome gradient and ten change
interpolate into a monochrome gradient and then change
the orientation before we continue in direction of the
final gradient.
*/