lin_perp - Geometric procedure

Creates a line


Description

Creates a line perpendicular to another line. The line can start in any position and have any length but the direction will always be perpendicular to the referenced line. With a positive value for length the new line will point to the right with respect to the referenced line and with a negative value for length the direction of the new line becomes opposite.

Syntax

lin_perp(id, p, ref, len:attributes);

REF	id;
VECTOR	p;
REF	ref;
FLOAT	len;

Principal parameters

id	- Local identity
p	- Start position
ref	- Identity of perpendicular line
len	- Length

Optional parameters

None.

Attributes

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

Example

lin_perp(#6,vec(0,0),#4,100);

Creates a line starting in X=Y=0 perpendicular to the line #4. The direction of the new line is to the right with respect of the sense of direction for #4.


Comments

In a 3D module the resulting line is restricted to the XY-plane of the active coordinate system. If the start position p or the line ref is not in in this plane they will be projected along the Z-axis onto the XY-plane before being used to create the new line.