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Harris Geospatial / Docs Center / Libraries / CATALYST / CAT_POLYGON__DEFINE

CAT_POLYGON__DEFINE

CAT_POLYGON__DEFINE

Name


      CAT_POLYGON__DEFINE

Purpose



      The purpose of this routine is to provide a polygon that can be displayed
      in a direct graphics draw widget. The coordinate system of the Cat_Polygon
      object is either passed to it (a CatCoord object) or is a normalized
      coordinate system by default.

Authors



        FANNING SOFTWARE CONSULTING BURRIDGE COMPUTING
        1645 Sheely Drive 18 The Green South
        Fort Collins Warborough, Oxon
        CO 80526 USA OX10 7DN, ENGLAND
        Phone: 970-221-0438 Phone: +44 (0)1865 858279
        E-mail: davidf@dfanning.com E-mail: davidb@burridgecomputing.co.uk

Category



      Objects.

Syntax



      polygonObject = Obj_New("CAT_POLYGON", XPTS, YPTS)
      drawObject -> Add, polygonObject

Superclasses



      SELECTABLEOBJECT
      CATDATAATOM
      CATATOM
      CATCONTAINER IDLITCOMPONENT
      IDL_CONTAINER

Class Structure



  class = { CAT_POLYGON, $
            background: 0L, $ ; A flag to indicate if a background polygon is drawn.
            bg_color: "", $ ; The background color.
            color: "", $ ; The name of a color to draw polygon in.
            linestyle: 0L, $ ; The line style of the polygon.
            xpts: Ptr_New(), $ ; The X points making up the polygon.
            ypts: Ptr_New(), $ ; The X points making up the polygon.
            npoints: 0L, $ ; The number of points in the polygon
            thickness: 0.0, $ ; The thickness of the polygon.
            sx: 0L, $ ; The static X location.
            sy: 0L, $ ; The static Y location.
            INHERITS SelectableObject $
          }

Messages



  CAT_POLYGON_CHANGED: This message is sent whenever SetProperty method is called and the NOMESSAGE
                      keyword is NOT set.

Event Structure



      This object will add the following fields to the event structure created by an interaction.
      The fields are defined as:
      BOUNDARY_BOX: A 2x5 element array in normalized coordinates giving the boundary box of
                        the object.
      XPTS: An array of X points in data coordinates descriping a polygon.
      YPTS: An array of Y points in data coordinates descriping a polygon.

Modification History



      Written by: David W. Fanning, 25 Jan 2004.



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