[Ipe-discuss] Re: Perspective

Nikolaus Rath Nikolaus at rath.org
Tue Mar 10 18:38:32 CET 2009

Tim Hutt <tdhutt at gmail.com> writes:
> On Mon, Mar 9, 2009 at 7:00 PM, Nikolaus Rath <Nikolaus at rath.org> wrote:
>> Hello,
>> I am working with a crude 3D picture of a cylinder. This works nicely
>> by just creating two circles, stretching them vertically and
>> connecting them with two straight lines (see attachment).
>> However, now I wanted to insert arrows that point around the cylinder.
>> So I inserted a couple of circle segments with arrows on one end.
>> Unfortunately, the stretching doesn't work out for arrows at all, it
>> basically destroys the illusion of perspective.
>> Is there a way to perspective scale objects in ipe? Or some other way
>> to achieve what I want?
> Simple workaround: use triangles instead of arrowheads.

Sounds good. But how do I create several of them precisely on the
circle? I can create the head-point in tangential direction by
enabling "snap to vertices" and pressing F1, but I don't see how I can
get the positions of the two base points so that they are at the same
distances from the circle....


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