[postgis-users] Bezier Support?

[Paul Ramsey]

Nope, SQL/MM only specifies circular arcs. At this point, I'll be
happy just to get that support roughed in fully.

P

On 3/9/08, Jeshua Lacock <jeshua at 3dtopo.com> wrote:
>
>  Greetings,
>
>  I am wondering if bezier type paths are supported with PostGIS. The
>  path is comprised of segments with an "anchor" point (X,Y) and a
>  "in" (X,Y) and "out" (X,Y) point. The anchor point is where the
>  segment is located and the in and out points of a segment define the
>  tangent of the curve at point.
>
>
>  I looked at the SQL-MM definitions, but I do not see a way to use them
>  for a bezier type curve:
>
>  CIRCULARSTRING(0 0, 1 1, 1 0)
>
>  COMPOUNDCURVE(CIRCULARSTRING(0 0, 1 1, 1 0),(1 0, 0 1))
>
>  CURVEPOLYGON(CIRCULARSTRING(0 0, 4 0, 4 4, 0 4, 0 0),(1 1, 3 3, 3 1, 1
>  1))
>
>  MULTICURVE((0 0, 5 5),CIRCULARSTRING(4 0, 4 4, 8 4))
>
>
>
>  Will I have to store the anchor points as a LINESTRING and created a
>  relational table for the in and out points?
>
>  And advice is greatly appreciated!
>
>
>  Many Thanks,
>
>  Jeshua Lacock
>  Founder/Programmer
>  3DTOPO Incorporated
>  <http://3DTOPO.com>
>  Phone: 877.240.1364
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