My own autolisp routines, with some commands and routines for luthiery specific drawing tasks
My CorelCAD startup file, to automatically load my customizations
It allow to construct new lines from the division between two defined points
linefrommidpoint
Ask to define two points; a mid point is calculated, and a line start to be drawn from there. The new line finish when defining the third and last point.
linefromthirdpoint
Ask to define two points; the point at one third their distances is calculated, and a line start to be drawn from there. The new line finish when defining the third and last point.
linefromgoldensection
Ask to define two points; then, a point at the golden section from them is calculated, and a line start to be drawn from there. The new line finish when defining the third and last point.
It construct a Vesica Piscis from two defined points
vesicastartend
Ask to define both opposite extreme points, then draw the Vesica.
vesicacenterend
Ask to define the center and one of the opposite extreme points, then draw the Vesica.