Re: [artworks] New arrowheads

  • From: John Cartmell <john@xxxxxxxxxxxxxxxxxxxx>
  • To: artworks@xxxxxxxxxxxxx
  • Date: Fri, 05 May 2006 15:05:03 +0100

On 05 May, Martin Wuerthner <lists@xxxxxxxxxxxxxxx> wrote:
> In message <347f3a224e.eddie@xxxxxxxxxxxxxxxxxxxxxxxxx>
>           Eddie Lord <riscos@xxxxxxxxxxxxxxxxxxx> wrote:

> > In message <85cfc8214e.martin@xxxxxxxxxxxxxxxxxxx>
> >           Martin Wuerthner <lists@xxxxxxxxxxxxxxx> wrote thus:
> > 
> >> While we are discussing the name for the new arrowhead option I
> >> noticed that while working on the arrowheads this might be a good time
> >> to add new ones as well.
> >> 
> >> In the medium term I would like to add user-defined arrowheads, which
> >> should not be too difficult, but it will not make it into 2.6. It
> >> might be a nice bonus to have at least a few nice new arrowheads in
> >> ArtWorks 2.6 (and the associated AWRender).
> >
> > Can I remind you of an arrow request I put in a few months ago?
> > 
> > Can we have one that ends in an open circle please?
> > 
> >  i.e.   o----------o

> Thanks for reminding me. Sounds like a good idea. You got it. ;-)

> I will probably do a new filled circle arrowhead, too. The "blob" 
> arrowhead that we have is very ugly - it is not a proper circle.

> With both the filled and unfilled circles, there remains one question, 
> however: Where exactly should they be positioned with respect to the 
> line anchor point? It is clear for the old non-integrated arrows - the 
> arrowhead starts at the line end, i.e., where the anchor point is. In 
> the integrated case, the tip of the arrow is placed on the anchor 
> point, but what exactly is the tip of such an arrow? One could argue 
> that it is the centre of the blob or the open circle. This would allow 
> you to position the centre using the anchor point, which is useful if 
> you want to use the filled circle arrowhead to label something. 
> Similarly, if you use the open circle arrowhead to denote an open 
> interval in a graph, then you will want to position the centre of the 
> circle. So, I think this is how it should work.

And some users may like an open circle with a dot in the centre - with the dot
at the anchor point.

        John Cartmell   john@ followed by   0845 006 8822
        Qercus magazine FAX +44 (0)8700-519-527
        Qercus - the best guide to RISC OS computing

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