Programmer Guide/Command Reference/EVAL/pginit: Difference between revisions

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:;<var>N</var>:The requested number of simple polygons:
:;<var>N</var>:The requested number of simple polygons:
::{|class="keinrahmen"
::{|class="keinrahmen"
|<var>N</var><=0 ||undefined, polygons are counted during initialization
|<var>N</var>&le;0 ||undefined, polygons are counted during initialization
|-
|-
|<var>N</var>>0 || exactly <var>N</var> simple polygons must be contained in <var>X</var>
|<var>N</var>>0 || exactly <var>N</var> simple polygons must be contained in <var>X</var>
|}
|}
:;<var>E</var>:The maximum error for polygon simplification. If <var>E</var><=0 the simplification is skipped.
:;<var>E</var>:The maximum error for polygon simplification. If <var>E</var>&le;0 the simplification is skipped.
:;Result:A [[../#polygons|polygon-stream]] <var>P</var> containing all simple-polygons defined by <var>X</var>. The function failes if:
:;Result:A [[../#polygons|polygon-stream]] <var>P</var> containing all simple-polygons defined by <var>X</var>. The function failes if:
::*no simple polygons can be found or one of the detected polygons is invalid
::*no simple polygons can be found or one of the detected polygons is invalid
::*<var>N</var>>0 and the number of polygons defined by <var>X</var> is not equal to <var>N</var>
::*<var>N</var>>0 and the number of polygons defined by <var>X</var> is not equal to <var>N</var>
;See also: [[../pgget|pgget]], [[../pgitest|pgitest]], [[../pgiline|pgiline]], [[../pgxgrid|pgxgrid]], [[../pgsplit|pgsplit]], [[../pgtrans|pgtrans]], [[../pghull|pghull]]
;See also: [[../pgget|pgget]], [[../pgitest|pgitest]], [[../pgiline|pgiline]], [[../pgxgrid|pgxgrid]], [[../pgsplit|pgsplit]], [[../pgtrans|pgtrans]], [[../pghull|pghull]]


[[../#Functions|<function list>]]
[[../#Functions|<function list>]]

Latest revision as of 19:10, 21 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
See also
pgget, pgitest, pgiline, pgxgrid, pgsplit, pgtrans, pghull

<function list>

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