Trilithon Protractors Trilithon Software Software for the Macintosh MillenniumSM . . . 
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Protractors Controls

Several controls are on the faces of the protractors themselves. This screen shot shows the controls for the protractors.

Protractors Controls

Move

Move the protractor by grabbing it and dragging it with the mouse. As you move the protractor, it turns partially transparent, so you can see through the protractor for more precise positioning.

Units Controls

Click on the Units Control on the protractor to select a different set of units. Available units are currently degrees (360 gradations to a circle), grads (400 gradations to a circle), mils (6,400 gradations to a circle), radians ( gradations to a circle), and a compass rose.

Direction Controls

Click on the Direction Control on the protractor to select the direction of measurement. Direction is measured as Widdershins (anti-clockwise), or Deasil (clockwise).

Zero Point Controls

Click on any of the Zero Point Controls on a protractor to select a zero point for that protractor.