How to use QPainterPathStroker?

[lni]

Hi,

I need to create an outline following a curve with a fixed width (said 100), as shown in my attachment 1.

To do this, I use QPainterPathStroker using following code. However, the resulting stroker joins them with the curve (see attachment 2). What I want is the outline without joining with the curve. How can I do so? Thanks!

QVector<QPointF> myCurve; // <-- myCurve is calculated somewhere else.
 
    QPainterPath curvePath;
    curvePath.moveTo( myCurve[ 0 ] );
    for ( int idx = 1; idx < myCurve.size(); idx++ ) {
      curvePath.lineTo( myCurve[ idx ] );
    }
 
    QPainterPathStroker stroker;
    stroker.setCapStyle( Qt::RoundCap );
    stroker.setJoinStyle( Qt::RoundJoin  );
    stroker.setWidth( 100 );
    QPainterPath outline = stroker.createStroke ( curvePath );
    painter->drawPath( outline );

QVector<QPointF> myCurve; // <-- myCurve is calculated somewhere else.

    QPainterPath curvePath;
    curvePath.moveTo( myCurve[ 0 ] );
    for ( int idx = 1; idx < myCurve.size(); idx++ ) {
      curvePath.lineTo( myCurve[ idx ] );
    }

    QPainterPathStroker stroker;
    stroker.setCapStyle( Qt::RoundCap );
    stroker.setJoinStyle( Qt::RoundJoin  );
    stroker.setWidth( 100 );
    QPainterPath outline = stroker.createStroke ( curvePath );
    painter->drawPath( outline );

To copy to clipboard, switch view to plain text mode