Tip 2229: Perpendicular Line Drawing
The Perpendicular Line Drawing utility by Jimmy D'Hondt is a simple routine that makes it easier to draw a perpendicular line. After loading the LISP module, type Perpline at the Command line of AutoCAD to activate the function. The first prompt will ask for a point on the object from which a perpendicular will be determined. Next, supply a point to the side at the distance you want the perpendicular line to start. The function then takes the second point entered and starts the Line command with a perpendicular object snap back to the first point selected. This function demonstrates how you can use LISP to manipulate the command sequence into something that makes more sense to you.