Draft Circle

Description
This tool draws a circle by asking for two points, the center and the radius, by picking tangents, or any combination of those.



Usage

 * The primary use of the circle tool is by picking two points, the centre and a point on the circumference, defining the radius.
 * By pressing, you can select a tangent instead of picking a point. You can therefore construct several types of circles by selecting one, two or three tangents.
 * Picking a point on an empty area of the 3d view, or on an existing object.
 * Pressing will snap your point to availible snap locations.
 * Pressing constrains your movement.
 * Enter numbers to manually insert a coordinate.
 * Pressing cancels the function.
 * The newly created line will take the current linestyle.

Scripting
The created circle is a Part feature containing one edge with only one vertex.