Programmer Guide/Command Reference/EVAL/pginit: Difference between revisions
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Check or | Check or initialize a polygon stream. | ||
;Usage:<code>pginit(<var>X</var> {, <var>N</var>=0, {number}<var>E</var>=0} )</code> | ;Usage:<code>pginit(<var>X</var> {, <var>N</var>=0, {number}<var>E</var>=0} )</code> | ||
:;<var>X</var>:A [[../#polygons|closed point-list]] or a [[../#polygons|polygon-stream]] defining one or more polygons. | :;<var>X</var>:A [[../#polygons|closed point-list]] or a [[../#polygons|polygon-stream]] defining one or more polygons. | ||
Revision as of 14:00, 18 April 2011
Check or initialize a polygon stream.
- Usage
pginit(X {, N=0, {number}E=0} )- X
- A closed point-list or a polygon-stream defining one or more polygons.
- N
- The requested number of simple polygons:
N<=0 undefined, polygons are counted during initialization N>0 exactly N simple polygons must be contained in X
- E
- The maximum error for polygon simplification. If E<=0 the simplification is skipped.
- Result
- A polygon-stream P containing all simple-polygons defined by X. The function failes if:
- no simple polygons can be found or one of the detected polygons is invalid
- N>0 and the number of polygons defined by X is not equal to N
