VARKON Version 1.15 1997-12-29

cur_offs - Geometric procedure

Creates a curve


Description

Creates a curve with constant offset to another curve.

Syntax

cur_offs(id, ref, offset:attributes);

REF	id;
REF	ref;
FLOAT	offset;

Principal parameters

id	- Local identity
ref	- Identity of other curve
offset	- Offset value, pos. value => right side, neg. value => left side

Optional parameters

None.

Attributes

PEN	- Pen or colour number
LEVEL	- Level number
BLANK	- Visible(0) or invisible(1)
CFONT	- Solid(0), dashed(1) or centerline(2)
CDASHL	- Dashlength
WIDTH	- Linewidth

Examples

cur_offs(#4,#2,10);

Creates a curve #4 on the right side of and at constant perpendicular distance from #2. Distance = 10.

Comments

In a 3D module the result is always a planar curve in the XY-plane of the active coordinate system. If the original curve is not in this plane it will be projected along the Z-axis onto the XY-plane before the new curve is created.

The old curve must be C1 continous. Normally all curves in VARKON are C1 continous but curves with kinks can be created for example with cur_comp.

If the original curve has sharp inner corners and the offset value is large loops may result. VARKON tries to detect this and generates an error message if one is found.

Note that all curves including UV-curves and other offset curves can be used to create new offset curves.