Another question :

Now my widget is OK, I can draw an animated pendulum inside. 
I would like to add the animation function as a parameter.
So I add a parameter to my widget :
<$mycanvas animation="pendulum">

I get the parameter in the execute() function. 
I create a tiddler with my animation function "pendulum.js" with type 
"application/javascript".

Then I want to execute my function with something like : 

   - window[this.displayFunc](this.canvasDomNode);
   - (eval(this.displayFunc))(this.canvasDomNode);

Neither worked. I tried to add a type:command / type:utils / type:global to 
my pendulum.js tiddler. But it didn't worked.

I have no clue how to define and call this function from the widget.

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