#253 Tools for drawing with oblique projection

[William Kendrick]

Magic tools, similar to the N-point Perspective tools (and axonometric; see #252), for drawing objects with oblique projection. That is, a line-drawing that only allows lines to be drawn at certain angles.

The directions would be vertical (90 and 270 degrees), horizontal (0 and 180 degrees), or the angle of the receding axis (typically 30 or 45 degrees, but can be any angle).

A useful image can be seen here: http://engineeringessentials.com/ege5/files/ege/pic/pic_page4.htm

[William Kendrick]

They are a bit slow on my Android phone, but seem to do the job.