Offset Curve <OffsetCurve>

Synopsis

This design generates a curve offset from another curve. The input curve must be planar. The offset distance may be positive or negative. The "positive side" of the curve is defined as follows: If sidePoint: is provided, then the side the point is on is the positive side. If planeNormal is provided, then the positive side is defined by the vector cross product of the curve tangent and the planeNormal. This is "to the right" if you travel along the curve with "up" in the planeNormal direction.

Mixins

Canonicals

Name	Type	Description
curve	part	Curve part to offset.
offsetDistance	number	Normal distance from the input curve to the new offset curve.

Parameters

Name	Type	Description
planeNormal	vector	Normal vector of the plane used to offset the curve. This is only used to determine the side for positive offset distances, and does not need to be strictly perpendicular to the plane of the curve.
surface	part	Surface used to compute the offset vectors for the curve. [This is not yet supported]
fillType	name	Algorithm used to fill gaps in the offset curve. Default is Fillet, but choices include Fillet, Tangent, or Natural.
sidePoint	point	Used to determine the side for positive offset distances. The point on the curve nearest to sidePoint is used to determine the positive side.

Example 1

Name:	offsetCurve_Ex01
Design:	acDrawingDocument

Child Name:	baseCurve
Child Design:	:SplineCurve
Name	Type	Supplied
color	string	"blue"
pointList	list	{point(2,-2,0), point(4,5,0), point(6,6,0), point(8,6,0)}

Child Name:	offsetCurve
Child Design:	:OffsetCurve
Name	Type	Supplied
curve	any	baseCurve

Example 2

Name:	offsetCurve_Ex02
Design:	acDrawingDocument
Name	Type	Formula
ptList	list	Dim i As Integer Dim result As List For i = 1 To 9 result = result + _ {cl.pointAtLength(cl.length / 9 * i)} Next i Return result

Child Name:	spine
Child Design:	:SplineCurve
Name	Type	Supplied
color	string	"blue"
pointList	list	{point(5,-4,0), point(7,4,0), point(4,7,0)}

Child Name:	end
Child Design:	:Line
Name	Type	Supplied
thruPoint1	point	spine.endPoint
thruPoint2	point	leg.endPoint

Child Name:	flange
Child Design:	:offsetCurve
Name	Type	Supplied
curve	part	spine
offsetDistance	number	0.1

Child Name:	leg
Child Design:	:OffsetCurve
Name	Type	Supplied
curve	part	spine
offsetDistance	number	1.0

Child Name:	start
Child Design:	:Line
Name	Type	Supplied
thruPoint1	point	leg.startPoint
thruPoint2	point	spine.startPoint

Child Name:	cl
Child Design:	:OffsetCurve
Name	Type	Supplied
curve	part	spine
offsetDistance	number	0.5
render?	boolean	false

Child Name:	pt
Child List?
Child Design:	:Point
Name	Type	Supplied
quantity	integer	length(ptList)
origin	point	nth(child.index, ptList)
color	string	"red"