pgget

Extract a polygon from a closed point-list or a polygon-stream.

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Usage 1

pginit(X)

X

A closed point-list or a polygon-stream defining one or more polygons.

Result 1

The number of simple polygons N stored in X. If the result is 0, X contains no valid polygons.

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Usage 2

pginit(X, I, fmt)

X

A closed point-list or a polygon-stream defining one or more polygons.

I

The index of the polygon to be returned; 0 <= I < N (= pgget(X))

fmt

The format of the result.:

fmt=0

... return the I-th polygon of X as polygon-stream

fmt=1

... return the polygon-stream header (a 8x2 matrix) of the I-th polygon of X

Result 2

The I-th polygon stored in X in the format selected by fmt.

on. If E<=0 the simplification is skipped.

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See also

pgget, pgitest, pgiline, pgxgrid, pgsplit, pgtrans, pghull

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