Attached you find an implementation of your plot item - the missing parts should be trivial.
It can be used this way:
CoordinateSystem* system = new CoordinateSystem();
system
->setPosition
( QPointF( 1.0,
8.0 ) );
system
->setSize
( QSizeF( 2.0,
2.0 ) );
system->setRotation( 30.0 );
system->setZ( ... );
...
system->setRenderHint
( QwtPlotItem::RenderAntialiased,
true );
system->attach( &plot );
CoordinateSystem* system = new CoordinateSystem();
system->setPosition( QPointF( 1.0, 8.0 ) );
system->setSize( QSizeF( 2.0, 2.0 ) );
system->setRotation( 30.0 );
system->setZ( ... );
...
system->setRenderHint( QwtPlotItem::RenderAntialiased, true );
system->attach( &plot );
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HTH,
Uwe
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