Free Point
Create a free point on an area or a free point on an uni-dimensional
object. In the first case, the created point can be moved anywhere in
the figure area. To build the point the user just clicks on the
background. In the latter case, it is constrained to the
uni-dimensional object (line); it is stuck to the object. To build
this kind of point the user clicks over a line (i.e. straight line,
ray, segment, circle, arc, etc.).
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