Andrew’s Pitchforks are defined by 3 points. Order for points (1) and (2) does not matter, but point (3) always define the origin point.

Screen shot 2011-05-31 at 5.19.29 PM

After you select “Add Pitchfork” in the popup menu, the program with wait for three left clicks defining three points. At any time, right click cancel the sequence.

Screen shot 2011-05-31 at 5.23.26 PM

If you select and delete one the pitchfork lines, the pitchfork is deleted. You can, however, define colors and thicknesses independently for each line.