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

Herbert Voss Herbert.Voss at FU-Berlin.DE
Mon Aug 2 08:35:27 CEST 2010

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.

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?


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