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OffsetPolyN

Description

Offsets a polygon or polyline. Uses Parasolid to do it. Equivalent of Voronoy based OffsetPoly.

FUNCTION OffsetPolyN(
				h              : HANDLE;
				offsetDistance : REAL;
				smoothCorners  : BOOLEAN): HANDLE;
def vs.OffsetPolyN(h, offsetDistance, smoothCorners):
    return HANDLE

Parameters

Name Type Description
h HANDLE
offsetDistance REAL
smoothCorners BOOLEAN

Remarks

(_c_, 2020):

  • smoothCorners will create rounded corners
  • there is a suppression of collinear vertexes from the original object, so the resulting poly doesn't necessarily have the same count of vertexes.

(_c_, 2011): It outputs a polygon (Type 5), polyline (Type 21) or a group (Type 11), according to the offset geometry and eventual intersections. OffsetPolyN fails:

  • on holes, they are ignored
  • used from inside plug-in objects: deselects the object instance on drawing at each run, compelling the user to re-select (tested from VW 2011 through 2014, also in 2016).

Examples

BEGIN
	toppoly_h := OffsetPolyN(poly_h, total_ht, FALSE);
	RepeatFirstVertexAndClose(toppoly_h);
END;

BEGIN
	IF ( i <> 0 )
		THEN HoleCutterHand := OffsetPolyN( HoleCutterHand, i * OffsetDistance, TRUE )
		ELSE HoleCutterHand := CreateDuplicateObject( HoleCutterHand, pioHand );
	IF ( HoleCutterHand <> NIL ) THEN
	BEGIN
		boo := AddHole( PolyHand, HoleCutterHand );
		DelObjectClearHandProc( HoleCutterHand );

BEGIN
	hPaDSlidOut := OffsetPolyN(hLine2D, kPandDPipeRad, FALSE );
	SetFPat (hPaDSlidOut,0);
	SetLSN (hPaDSlidOut,4);
	IF bNonStockPaD & bHghLghtNonStckPaD THEN SetPenFore (hPaDSlidOut,65535,0,0);
	hPaDSlidIn := OffsetPolyN(hLine2D, -kPandDPipeRad, FALSE );
import vs

# Offsets a polygon or polyline.
h = vs.FSActLayer()  # handle to the first selected object on the active layer
offsetDistance = 1.0
smoothCorners = True

objHandle = vs.OffsetPolyN(h, offsetDistance, smoothCorners)
if objHandle is not None:
    vs.Message('Created object handle: ' + str(objHandle))

See Also

Similar calls:

Version

Availability: from Vectorworks 2009

Category