pghull

Calculate the hull polygon of two polygons.

Usage

pghull(X, IX, Y, IY)

X

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

IX

the index of a polygon of X; 0 ≤ IX < pgget(X)

Y

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

IY

the index of a polygon of Y; 0 ≤ IY < pgget(Y)

Result

The result r is a polygon-stream containing the hull polygon of X_IX and Y_IY. The function fails if the two polygons have no overlapping regions.

See also

pginit, pgget, pgitest, pgiline, pgxgrid, pgsplit, pgtrans

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