[Ipe-discuss] Specify direction of an arc in a curve containing many segments

Otfried Cheong otfried at ipe.airpost.net
Thu Nov 24 07:10:11 CET 2016

I think you need to change the orientation of the matrix: put a minus in
front of the first r.


On Thu, Nov 24, 2016, at 06:54, Andrew Martchenko wrote:
> Hi all,
> I have written an ipelet (attached) called "fillet", which will create 
> circular fillets on a polyline or polygon. The problem I am having is 
> that I am unable to specify which side of an arc to draw when 
> constructing the filleted curve. On line 108, swapping x1 and x2 around 
> in the function
>      ipe.Arc(ipe.Matrix(r, 0, 0, r, c.x, c.y), x1, x2)
> does not make a difference to the arc that gets drawn.
> I have attached a test.ipe file to illustrate the problem. Here's how to 
> run the ipelet
> 1) select the shape
> 2) type Ctrl-F
> 3) enter 12 for the radius of the fillet and select OK
> Notice that the inner fillets are correctly applied while the outer 
> fillets are incorrect. So how can I specify the direction in which the 
> arc is drawn.
> Also, how would I go about deleting the old polygon/polyline?
> Cheers,
> Andrew M.
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> Ipe-discuss at lists.science.uu.nl
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> Email had 2 attachments:
> + fillet.lua
>   3k (text/x-lua)
> + test.ipe
>   7k (text/xml)

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