Graphics Options and Device Parameters Dictionary |
Specifies the type of clipping used when two polygons overlap.
Used in: |
GOPTIONS statement
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Default: |
device-dependent
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Restriction: |
not supported by Java or ActiveX
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See also: |
PCLIP
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POLYGONCLIP | NOPOLYGONCLIP
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POLYGONCLIP
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specifies polygon clipping, which enables
a clipped polygon to be filled with a hardware pattern. POLYGONCLIP affects
only graphs that have blanking areas or intersecting polygons.
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NOPOLYGONCLIP
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specifies line clipping; a polygon that
has been line-clipped cannot use a hardware pattern.
Clipping is the process of
removing part of one polygon when two polygons intersect. For example, in
a block map, a block might overlap the boundary of its map area. In this case,
the polygon that makes up the map area is clipped so that you do not see the
boundary line behind the block. (See Intersecting Polygons for an illustration of a clipped polygon.) The type of clipping
used by a graph affects whether a clipped area can use hardware patterns.
POLYGONCLIP is affected by the PCLIP graphics option:
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POLYGONCLIP with PCLIP or NOPCLIP
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all areas can use hardware patterns
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NOPOLYGONCLIP with NOPCLIP
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all areas use only software patterns
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NOPOLYGONCLIP with PCLIP
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areas can use either hardware or software
patterns depending on the nature of the clipped polygons.
Under some conditions the polygons might not be clipped
correctly. Specifying both POLYGONCLIP and NOPCLIP will produce the correct
graph.
Copyright © 2010 by SAS Institute Inc., Cary, NC, USA. All rights reserved.