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| How do I digitize a circle, or half a circle? |
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You can use the Digitize | Circle command to digitize a circle. It works in one of two ways: either 2-point mode or 3-point mode. In 2-point mode you click the center and an edge to define the circle. In 3-point mode, you click 3 edge points instead.
Which circle mode is used is controlled in File | Project Settings. On the General tab, look for the Circle section that has a checkbox for Use 3 point method.
The Digitize Circle command is documented in the help file. In the Contents, open the Digizing chapter and look at the Circle topic.
If you only want part of the circle, first digitize the whole circle and then modify it. There are a couple of different ways to modify it that could be used:
Click on the circle so that it is selected. Convert it to a polyline using the Tools | Polygon to Polyline command. Then use the Tools | Break Polyline command and click where you want to break the circular polyline in two. Delete the parts you don't want. If you want, you can select the remaining half-circular polyline and go to Tools | Polyline to Polygon to convert it back into a polygon. Digitize a polygon that starts outside of the circle, cuts across the circle where you want to divide it, and then end back outside again. Select the circle and the polygon and use the Tools | Intersect Polygons command to produce a new polygon that is the intersection of the two.
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