[cairo] How to draw an invisible rectangle?

[Tuom Larsen]

On Dec 16, 2007 6:29 PM, Dirk Schönberger <dirk.schoenberger at sz-online.de>
wrote:

> > Sounds like a case for your app deciding when it should be drawn and
> then
> only
> > creating and stroking the path at that stage.
>
> Not quite. The path should eist (e.g in a generated SVG document), it only
> should not be rendered.
> Think e.g of a SVG document which should be embedded in a wordprocessor
> document (given the fact that such a tool actually exist).
> The invisible path could be used to define the outline of the document.
> But
> because you don't know anything about the background of the document, you
> don't want to render the path, just use it for flow calculations.
>

Exactly!


>
> The most obvious way to do this would be to set a source surface to
> "NULL",
> or to a special Null-Surface. The former variant may lead to unexpected
> behaviour, because NULL may be treated as an invalid value.


Um, what is Null-Surface? How? Can't find it in API reference.
I'm running pycairo 1.2.6, if that make things a bit cleaner..



>
>
> Regards
> Dirk
>
>
>
>
>
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