
Adding Points onto a Polygon
If the selected item is a polygon and this button is pressed the bounding-box
and its points will be deleted and coordinate points for the shape will be
shown as follows :

In a similar method to the Move-point option, a point can be added
in the following way :
- < ButtonPress-1 >
- In one of the coordinate points selects that point and arranges for a
point to be added after that one.
- < B1-Motion >
- Creates a visual aid for the user in the form of a joining line between
the point originally selected, the current cursor location and the
point after it.
- < ButtonRelease-1 >
- Identifies the location for the new point to be drawn, and redraws the
shape with the additional point. It is then reselected.
For example, if from the above diagram point 3 is selected, a point
will be inserted between point 3 and point 4 therefore renumbering
the points as shown below :
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Gudge.