Programmer Guide/Command Reference/EVAL/pgitest

Check the relation (outside, inside, overlap) of a given point, line or simple polygon p to the polygon x.

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Usage 1

pgitest(X, IX, PXscalar, PYscalar)

X

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

IX

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

PX, PY

The point P=<PX,PY> to be tested.

Result 1

The result r is a scaler.

r=0	... point P is outside the polygon
r=1	... point P is inside the polygon

pgitest(X, I, PXscalar, PYvector)

pgitest(X, I, PXvector, PYscalar)

pgitest(X, I, PXvector, PYvector)

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

pgget(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.

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See also

pginit, pgitest, pgiline, pgxgrid, pgsplit, pgtrans, pghull

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