[postgis-tickets] [PostGIS] #3099: ST_curveToLine bad conversion for some arcs

[PostGIS]

#3099: ST_curveToLine bad conversion for some arcs
--------------------------+----------------------------
  Reporter:  claudeunger  |      Owner:  pramsey
      Type:  defect       |     Status:  new
  Priority:  critical     |  Milestone:  PostGIS 2.1.9
 Component:  postgis      |    Version:  2.1.x
Resolution:               |   Keywords:  ST_curveToLine
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Comment (by tiiipponen):

 After thinking a bit more I would like to clarify few comment rows in
 code:

 /* Using cartesian eguations from page
 https://en.wikipedia.org/wiki/Circumscribed_circle */[[br]]
 ^^=^^>[[br]]
 /* Using cartesian circumcenter eguations from page
 https://en.wikipedia.org/wiki/Circumscribed_circle */[[br]]

 /* 2 * |Cross product|, d<0 means clockwise and d>0 counterclockwise
 sweeping angle */[[br]]
 ^^=^^>[[br]]
 /* 2 * Cross product, d<0 means clockwise and d>0 counterclockwise
 sweeping angle */[[br]]

 /* Check colinearity, |Cross product| = 0 */[[br]]
 ^^=^^>[[br]]
 /* Check colinearity, Cross product = 0 */[[br]]

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3099#comment:7>
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