[pstricks] {pst-eucl?} Drawing a circle with tangent

Hubert Lam pstricks at tug.org
Mon Aug 2 23:43:24 CEST 2010

Sorry, I meant the examples provided in .tex files with the package but
drawn in the documentation (p. 24, section 2.1.7)

I'll give an example here instead


This is the way to draw the circle and tangent without being able to
specify the radius or point of contact directly (but am able to specify
directly the tangent). I would like to be able to specify the radius
directly and also the point of contact.

Many thanks


On Mon, 02 Aug 2010 08:35 +0200, "Herbert Voss"
<Herbert.Voss at fu-berlin.de> wrote:
> Am 02.08.2010 04:55, schrieb Hubert Lam:
> > In the documentation of pst-eucl the author shows how to draw a circle
> > with a tangent by specifying three points: the end points of the tangent
> > and the centre of the circle, then the point of contact is found by
> > \pstProjection (i.e. radius is perpendicular to point of contact) and
> > then the circle is drawn using \pstCircleOA.
> Hubert,
> to which page of the documentation do you refer?
> > Is there a way of using the macros in pst-eucl (and/or pstricks-add) to
> > specify the radius of the circle, and then drawing the tangent from
> > there without having to differentiate the semicircle function, find the
> > coordinates of the point of contact and then substitute into y = mx + b?
> Herbert
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