A (filled) polygon can be plotted by a PLOT operation of the form
PLOT <data>,<xvar>,<yvar> / LINE=POLYGON,<fill_index>
The coordinates of the vertices are given by the <xvar> and <yvar>
variables and the polygon is filled by the shading (or color)
given by the (optional) <fill_index>.
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Example:
DATA POLY6:(X,Y) 0,0 4,1 3,3 2,2 0,2 1,1 END
GPLOT POLY6,X,Y / LINE=POLYGON,5 GRID=1,1
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A more general form on the next page!
If <yvar> has missing values, a sequence of polygons is plotted.
A missing <yvar> value terminates plotting of the current polygon
and starts a new one with <fill_index> given by the <xvar> value.
If <fill_index> is 0, only the edges of the polygon are drawn.
LINE=[line_width(0)],POLYGON,<fill_index>
means that the edges are not drawn but the polygon is filled.
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Example: Three partially overlapping polygons
DATA POLY14:(X,Y) 2,0.5 4,3 0,0 3,- 0,2.5 0,1 4,2 3,2.7 2,-
4,0 4,1 2.8,1.2 2.5,3 2.3,0
GPLOT POLY14,X,Y / LINE=POLYGON,5 GRID=1,1
ROP=9 (Test various raster options using ROP values 0,1,2,...,15!)
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P = More information about polygons
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