4.207: Sample AutoLISP

Geometric Utilities

4.207 | Tutorials and Samples
write requests to: takehiko@mit.edu
last revised : 10/5/06
LISPLOADERŠ Set Up

AutoLISP file

geom_01.lsp: : This program provides various geometric utility functions in AutoLISP.

Functions Defined (click button for dispatching to AutoCAD)

(c:demo): :
(point-in-polygon x y point_list): : This checks if a given point, (x y) is inside a polygon defined
by point_list, ((x1 y1) (x2 y2) ....) .
If the point is outside, it returns 1.
If the point is inside, it returns -1.
If the point is on a side of the polygon, returns 0.; (point-in-polygon 5 10 '( (0 0) (10 0) (10 10) (0 20) ) )

Standard AutoCAD Commands