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interpolating colors improved

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This commit is contained in:
Uwe Rathmann 2019-01-04 11:53:16 +01:00
parent 738695031b
commit 14444fc1fd
1 changed files with 23 additions and 6 deletions
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25
src/common/QskRgbValue.cpp
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@ -79,13 +79,30 @@ QRgb QskRgbValue::interpolated( QRgb rgb1, QRgb rgb2, qreal ratio )
QColor QskRgbValue::interpolated( const QColor& c1, const QColor& c2, qreal ratio )
{
if ( c1 != c2 && c1.isValid() && c2.isValid() )
if ( c1 == c2 )
return c2;
/*
If one of the colors is invalid we treat it like
a transparent version of the other color
*/
if ( !c1.isValid() )
{
QColor c = c2;
c.setAlpha( ratio * c2.alpha() );
return c;
}
if ( !c2.isValid() )
{
QColor c = c1;
c.setAlpha( ( 1.0 - ratio ) * c1.alpha() );
return c;
}
if ( c1.spec() == c2.spec() )
return qskInterpolatedColor( c1, c2, ratio );
else
return qskInterpolatedColor( c1.convertTo( c2.spec() ), c2, ratio );
}
return c2;
}