Cairo drawing within a rectangle or another path

Hi,

 

I have this problem in Cairo that I only want to show what is within a rectangle.

 

I used to do these things within a seperate surface after which I showed this as a source on the cairoContext.

 

As I want to make a fully vectorised PDF file (without any images) I want to avoid these, so I am looking for the operators that allow me to define a rectangular path (or any other shape) and then draw within this path.

 

The enclosed image shows what kinf of effect I want. You can imagine thet the black liner are smaller and that the elips was partly drawn outide the greenish rectangle.

 

Anyone having a code snippit on this ?

 

Thanks in adavance,

 

Maarten,

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