VARKON Version 1.15 1997-10-24

sur_ruled - Geometric procedure

Creates a surface


Description

Creates a ruled surface by connecting consecutive positions from two lines, arcs or curves with straight lines (rulers).

Syntax

sur_ruled(id, curve1, curve2, reverse, par:attributes);

REF	id;
REF	curve1;
REF	curve2;
INT	reverse;
INT	par;

Principal parameters

id	- Local identity
curve1	- Identity of first line, arc or curve
curve2	- Identity of second line, arc or curve

Optional parameters

reverse	- Controls the parametric directions of the resulting surface
	1 = No reversal of input (default)
	-1 = Both input curves (U-direction) are reversed
	2 = Input curves change place (V-direction)
	3 = Input curves are reversed and change place
par	- Controls the type of parametrisation
	1 = Arc length parametrisation (default)

Attributes

PEN	- Pen or colour number
LEVEL	- Level number
BLANK	- Visible(0) or invisible(1)
SDASHL	- Dashlength

Example

sur_ruled(#3, #1, #2);

Creates a ruled surface connecting #1 with #2

Comments

The parameter of the curves becomes the U-direction of the surface and V goes from curve1 to curve2. The optional "reverse" parameter can be used to alter this.