Following on from my previous transformation query, it seems that plvect 
ignores the transformation set by plstransform. I've attached a patch to fix 
this. It essentially performs the transformation on both ends of the arrow 
before the conversion into device coordinates. It therefore transforms both the 
location and the direction of the arrows, which I assume is the appropriate 
behaviour.
 
Phil

Attachment: plvect_transform.patch
Description: Binary data

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