Answered
We have discussed it before: How to restrict the dragging of a point to a defined area.
This is necessary in many geometrical constructions, f.e. many examples of Geometric Places.
It applies to almost any geometric applet.
We can restrict a point to an invisible line segment.
It would be great if we could also restrict a point into a certain area.
A limitation to a convex, or even convex regular area is acceptable. (Square, triangle, rectangle or circle)
All solutions given over the years like covering an area with a linesegment are not very general.
I suggest some kind of command like P=RestrictedArea[c,inside/outside] which defines P inside or outside a circle c or a square s or a rectangle r.
Would this be possible?
Paul
The same question 
hello
in 4.0 it is possible already
pointin[<region>] for polygon, circle, ellipse, convex zone of hiperbola, inequations....
for more strange restrictions you can use dynamiccoordinates like this file
saludos
https://ggbm.at/549611
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