From: Stefan Goessner <goessner@mecxpert.de>

Date: Fri, 27 Apr 2001 14:38:58 +0200

Message-ID: <002101c0cf17$0ad061c0$e91ee23e@user>

To: <www-svg@w3.org>

Date: Fri, 27 Apr 2001 14:38:58 +0200

Message-ID: <002101c0cf17$0ad061c0$e91ee23e@user>

To: <www-svg@w3.org>

I was searching for a parameterized equation for elliptical arcs and .. quite happy to find it in a useful form in the spec (Appendix F.6 Eq. F.6.3.1). On the next page there I became aware of a formula to determine the angle between two vectors u and v (F.6.5.4). To implement this we need 4 calls of math functions: 1 x acos() 2 x abs() 1 x sign() I usually implement this in a somewhat other way, via teta = atan2(ux*vy - uy*vx, ux*vx + uy*vy); wich yields a teta in the range of -pi/2 < teta < pi/2 with no need to care for the sign or any other pre- or postcalculations and one single math function. are there any arguments against that ? -- stefan goessnerReceived on Friday, 27 April 2001 08:36:07 UTC

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