# [Volute] r3530 - trunk/projects/dal/DALI

Volute commit messages volutecommits at g-vo.org
Wed Oct 26 18:05:18 CEST 2016

Author: pdowler.cadc
Date: Wed Sep  7 19:18:57 2016
New Revision: 3530

Log:
specified polygon winding direction is counterclockwise

Modified:
trunk/projects/dal/DALI/DALI.tex

Modified: trunk/projects/dal/DALI/DALI.tex
==============================================================================
--- trunk/projects/dal/DALI/DALI.tex	Wed Sep  7 10:46:05 2016	(r3529)
+++ trunk/projects/dal/DALI/DALI.tex	Wed Sep  7 19:18:57 2016	(r3530)
@@ -789,19 +789,10 @@
\end{verbatim}

In spherical coordinates, all longitude values must fall within [0,360] and all
-latitude values within [-90,90].
+latitude values within [-90,90]. Vertices must be ordered such that the polygon
+winding direction is counter-clockwise (when viewed from the origin toward the
+sky).

-\todo{Choose one of these options}
-Option 1: The vertices of a polygon must be specified in counter-clockwise
-order.
-
-Option 2: The vertices of a polygon may be specified in clockwise or
-counter-clockwise order. The inside is the region with the smallest area;
-polygons in spherical coordinates are limited to less than half the sphere.
-
-\subsubsection{More geometry?}
-\todo{Do we want any of this?}
-Ellipse? Coord-range? STC Box?

\subsection{Standard Parameters}