Programmer Guide/Command Reference/EVAL/pghull - Revision history

Christian at 18:28, 21 April 2011

2011-04-21T18:28:34Z

← Older revision		Revision as of 20:28, 21 April 2011
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	:<code>pghull(<var>X</var>, <var>IX</var>, <var>Y</var>, <var>IY</var>)</code>		:<code>pghull(<var>X</var>, <var>IX</var>, <var>Y</var>, <var>IY</var>)</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.
	:;<var>IX</var>:the index of a polygon of ''X''; 0 <= <var>IX</var> < <code>[[../pgget\|pgget]](''X'')</code>		:;<var>IX</var>:the index of a polygon of ''X''; 0 ≤ <var>IX</var> < <code>[[../pgget\|pgget]](''X'')</code>
	:;<var>Y</var>:a [[../#polygons\|closed point-list]] or a [[../#polygons\|polygon-stream]] defining one or more polygons.		:;<var>Y</var>:a [[../#polygons\|closed point-list]] or a [[../#polygons\|polygon-stream]] defining one or more polygons.
	:;<var>IY</var>:the index of a polygon of ''Y''; 0 <= <var>IY</var> < <code>[[../pgget\|pgget]](''Y'')</code>		:;<var>IY</var>:the index of a polygon of ''Y''; 0 ≤ <var>IY</var> < <code>[[../pgget\|pgget]](''Y'')</code>
	;Result: The result ''r'' is a [[../#polygons\|polygon-stream]] containing the hull polygon of ''X<sub>IX</sub>'' and ''Y<sub>IY</sub>''. The function fails if the two polygons have no overlapping regions.		;Result: The result ''r'' is a [[../#polygons\|polygon-stream]] containing the hull polygon of ''X<sub>IX</sub>'' and ''Y<sub>IY</sub>''. The function fails if the two polygons have no overlapping regions.
	;See also: [[../pginit\|pginit]], [[../pgget\|pgget]], [[../pgitest\|pgitest]], [[../pgiline\|pgiline]], [[../pgxgrid\|pgxgrid]], [[../pgsplit\|pgsplit]], [[../pgtrans\|pgtrans]]		;See also: [[../pginit\|pginit]], [[../pgget\|pgget]], [[../pgitest\|pgitest]], [[../pgiline\|pgiline]], [[../pgxgrid\|pgxgrid]], [[../pgsplit\|pgsplit]], [[../pgtrans\|pgtrans]]

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

193.171.195.48 at 09:22, 20 April 2011

2011-04-20T09:22:57Z

← Older revision		Revision as of 11:22, 20 April 2011
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	:<code>pghull(<var>X</var>, <var>IX</var>, <var>Y</var>, <var>IY</var>)</code>		:<code>pghull(<var>X</var>, <var>IX</var>, <var>Y</var>, <var>IY</var>)</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.
	:;<var>IX</var>:~~The~~ index of ~~the~~ polygon of ''X'' ~~to be tested~~; 0 <= <var>IX</var> < <code>[[../pgget\|pgget]](''X'')</code>		:;<var>IX</var>:the index of a polygon of ''X''; 0 <= <var>IX</var> < <code>[[../pgget\|pgget]](''X'')</code>
	:;<var>~~DX, DY~~</var>: ~~shift values for x and y (default=0, no shift)~~		:;<var>Y</var>:a [[../#polygons\|closed point-list]] or a [[../#polygons\|polygon-stream]] defining one or more polygons.
	~~::* shift the center~~ point ~~<code><xc,yc></code> of ''X<sub>IX</sub>''~~		:;<var>IY</var>:the index of a polygon of ''Y''; 0 <= <var>IY</var> < <code>[[../pgget\|pgget]](''Y'')</code>
	~~:::<code><x~~[~~i] , y~~[~~i]>~~ -~~> <x[i~~]~~+<var>DX</var> , y[i~~]~~+<var>DY</var>></code>~~		;Result: The result ''r'' is a [[../#polygons\|polygon-stream]] containing the hull polygon of ''X<sub>IX</sub>'' and ''Y<sub>IY</sub>''. The function fails if the two polygons have no overlapping regions.
	:;<var>~~KX, KY~~</var>: ~~scaling factors; both factors must be greater than zero (default=1, no scaling)~~		;See also: [[../pginit\|pginit]], [[../pgget\|pgget]], [[../pgitest\|pgitest]], [[../pgiline\|pgiline]], [[../pgxgrid\|pgxgrid]], [[../pgsplit\|pgsplit]], [[../pgtrans\|pgtrans]]
	~~::* scale~~ the ~~distances~~ of ~~corners~~ of ''X<~~sub~~>IX</~~sub~~>~~'' to the center point~~
	~~:::~~<code><x[~~i] , y~~[i]~~> -> <(x[i~~]~~-xc)<var>KX</var>+xc ,~~ (~~y[i]-yc~~)<var>KY</var>'+yc></code>
	~~:;<var>A</var>: rotation angle in degree (default=0, no rotation); a scaling factors (default=1)~~
	~~::*rotate the polygon around the center point~~
	;Result: The result ''r'' is a [[../#polygons\|polygon-stream]] containing the ~~transformed~~ ''X<sub>IX</sub>''.
	;See also: [[../pginit\|pginit]], [[../pgget\|pgget]], [[../pgitest\|pgitest]], [[../pgiline\|pgiline]], [[../pgxgrid\|pgxgrid]], [[../pgsplit\|pgsplit]], [[../~~pghull~~\|~~pghull~~]]

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

193.171.195.48: Created page with '{{DISPLAYTITLE:{{SUBPAGENAME}}}} Calculate the hull polygon of two polygons. ;Usage: :`pghull(X, IX, Y, IY)` :;`X`…'

2011-04-20T09:19:28Z

Created page with '{{DISPLAYTITLE:{{SUBPAGENAME}}}} Calculate the hull polygon of two polygons. ;Usage: :<code>pghull(<var>X</var>, <var>IX</var>, <var>Y</var>, <var>IY</var>)</code> :;<var>X</var>…'

New page

{{DISPLAYTITLE:{{SUBPAGENAME}}}}
Calculate the hull polygon of two polygons.
;Usage:
:<code>pghull(<var>X</var>, <var>IX</var>, <var>Y</var>, <var>IY</var>)</code>
:;<var>X</var>:a [[../#polygons|closed point-list]] or a [[../#polygons|polygon-stream]] defining one or more polygons.
:;<var>IX</var>:The index of the polygon of ''X'' to be tested; 0 <= <var>IX</var> < <code>[[../pgget|pgget]](''X'')</code>
:;<var>DX, DY</var>: shift values for x and y (default=0, no shift)
::* shift the center point <code><xc,yc></code> of ''XIX''
:::<code><x[i] , y[i]> -> <x[i]+<var>DX</var> , y[i]+<var>DY</var>></code>
:;<var>KX, KY</var>: scaling factors; both factors must be greater than zero (default=1, no scaling)
::* scale the distances of corners of ''XIX'' to the center point
:::<code><x[i] , y[i]> -> <(x[i]-xc)*<var>KX</var>+xc , (y[i]-yc)*<var>KY</var>'+yc></code>
:;<var>A</var>: rotation angle in degree (default=0, no rotation); a scaling factors (default=1)
::*rotate the polygon around the center point
;Result: The result ''r'' is a [[../#polygons|polygon-stream]] containing the transformed ''XIX''.
;See also: [[../pginit|pginit]], [[../pgget|pgget]], [[../pgitest|pgitest]], [[../pgiline|pgiline]], [[../pgxgrid|pgxgrid]], [[../pgsplit|pgsplit]], [[../pghull|pghull]]

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

Programmer Guide/Command Reference/EVAL/pghull - Revision history

Christian at 18:28, 21 April 2011

193.171.195.48 at 09:22, 20 April 2011

193.171.195.48: Created page with '{{DISPLAYTITLE:{{SUBPAGENAME}}}} Calculate the hull polygon of two polygons. ;Usage: :pghull(X, IX, Y, IY) :;X…'

193.171.195.48: Created page with '{{DISPLAYTITLE:{{SUBPAGENAME}}}} Calculate the hull polygon of two polygons. ;Usage: :`pghull(X, IX, Y, IY)` :;`X`…'