18.6. Fill Area.   

(1)
Line drawing are not always sufficient: VLSI, animation, solid modelling.

(2)
Many devices are capable of filling areas with colour or via a pattern of some predefined style and type.

The area is defined by the boundary = a set of points similar to polyline, polymarker.
Fill Area (N,X,Y)
NOTE: that the area is bounded therefore the curve is closed. If the last point is the same as the first then you have closed it else the FILL AREA primitive does it.
Polyline (N,X,Y) may not give the same as
fill area (N,X,Y) since fill area closes last line segment.

    


   
     Fig. 18.3 : Fill Area.                    Polyline.

18.6.1. Fill Area Attributes.   

In Figure 18.3 the type of fill was HOLLOW: i.e. nothing filled in the area and only the boundary was drawn (Normally boundary is not drawn). Other interior styles are HATCH and SOLID and PATTERN.

    


   
        Fig. 18.4 : Hollow Fill, Solid Fill, Hatch Fill

  set fill area representation (          )

  set fill area interior style (          )- Hollow, solid, PATTERN, HATCH.

  set fill area style index (             )- only for PATTERN

  set fill area colour index (            )

  set pattern size (        )

  set pattern reference point (           )

  set pattern representation (           )