C. H. Hanson, manufacturer of the Chalk Hog, now offers something called the Angle Snap — a chalk line jig designed to simplify complex layout on sheet goods like plywood, sheet rock, or OSB. With built in positive stops for fast placement on edges and corners, it works with any standard chalk line to mark angles simply and accurately.
To use the Angle Snap, place the it at the edge or corner of the sheet you want to mark, fit the end of the chalk line into the Angle Snap, and pull the chalk line to the desired angle marked on the scale. When you snap the chalk line, the layout line is at the desired angle.
C. H. Hanson is promoting the Angle Snap on their website and they have a great video showing the tool in action. Unfortunately, the it doesn’t seem to be available for sale yet and no release date is listed.
Angle Snap [Manufacturer]