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Mouse click in DisplayImplJ2D

<HTML><P>Hi, there, </P>
<P>Suppose I implement a function, (x,y)-&gt;f, and display it in 2D with 
DisplayImplJ2D, how can I get the coordinates (x,y) as well as the range f, by 
clicking right button of mouse? </P>
<P>I notice that visad.bom.PickManipulationRendererJ3D offers similar 
functionality, but it is only for 3D, in other words, I cannot 
do:&nbsp;myDisplayImplJ2D.addReferences(PickManipulationRendererJ3D, 
myDataRef).&nbsp; Does anyone any workaround?</P>
<P>thanks in advance,</P>
<P>Kan</P>
<P>&nbsp;</P></HTML>
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