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#### A.4.5.28 Poly4 Form

The Poly4 () form is available from the quad position layer control, and draws a quadrilateral defined by the coordinates of its vertices supplied as 4 separate positions. Various options for how it is drawn, such as filled or outlined, are available.

Example Poly4 plot

Poly4 form configuration panel

Configuration options are:

Shading Mode
  See Appendix A.4.6.
Polygon Mode
  Defines how the polygon is drawn. Options are
  - `outline`: draws a line round the outside of the polygon
  - `fill`: fills the interior of the polygon
  - `cross`: draws a line round the outside of the polygon and lines between all the vertices
Fast
  Determines whether speed is favoured over accuracy when drawing polygons. In some cases unchecking this will give visually better results, and in some cases checking it will speed up plotting. In other cases, the setting will make no difference to either. It may be necessary to unset it when filling polygons that may be re-entrant.

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TOPCAT - Tool for OPerations on Catalogues And Tables
Starlink User Note253
TOPCAT web page: http://www.starlink.ac.uk/topcat/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk