Help for an experiment to build an sketch recognizer

Question

Many months ago I saw the sketch application made at MIT
http://www.youtube.com/watch?v=NZNTgglPbUA&eurl=
and
http://rationale.csail.mit.edu/project_assist.shtml
and I would like to try to do something similar in Flex or
Flash CS3 just for fun.
I think it could be an interesting exercise.
However, before I start I would like to get some ideas and
suggestions from others on how to do this sort of thing.
My first ideas are:
Start simple. Thus, first try to
recognize if the person is trying to draw a rectangle, another
polygon or a circle.
When the user clicks to start the app. records the initial
mouse position and as he moves the mouse more points are recorded
in an array. If the angle change is > something the app.
eliminates the intermediate points between the first point and the
last point before the big angle change. This should work for
polygons with relatively few sides.
To recognize circles, if the app. detects too may angle
changes in the same direction and the end point is close (3-5
pixels in x and y) record as circle.
If an drawing is recognized as a square for example, replace
it with a "real" square object, that may have some predefined
behaviors, like the balls in the MIT app.
Well those are my initial thoughts, but I want to have some
more ideas before beginning this experiment.
One more thing. The idea is that the user starts with a blank
canvas. No buttons or anything to drag and drop. The challenge is
to design an application that can recognize the sketches made by
users and do something based on those sketches. For instance, if a
draw a circle on top of a slope the circle will roll down. or if a
draw a rectangle (and its recognize appropriately it becomes a
button that can do trigger some event, etc.
Gilbert

Answer 1

Hi garycris,
I try that +AVG([Age].Levels(0).Members, [Accounts].[Head Count])+
The result is not good.
     Head Count     Age in Years
16     1     123
17     1     123
18     9     123
19     28     123
20     65     123
21     84     123
22     92     123
23     147     123
24     199     123
25     189     123
25 and under     815     123
26 to 35     1973     123
36 to 45     1803     123
46 to 55     1698     123
56 to 65     583     123
Over 65     16     123
Age by Decade     6888     123
Age by Generation     6888     123
Age     6888     123