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Hello, We will be using VisAD for interactive 2D and 3D scatterplots. The interactions to be added are "drilldown features" of sample point selection- individually as sample point picking and collectively with sample point lasso. The desired behaviors are: 1. For sample point picking, user clicks in plot area, and the sample point that is "closest" (in terms of euclidean distance in x-y screen coordinates) is highlighted, and a programmatic event is issued with the identity of that sample available. 2. For sample group picking, user clicks in plot area, drags the cursor in a path that creates a closed loop and releases the mouse button. Then sample points "inside" the loop (in terms of x-y screen coordinates) are highlighted, and a programmatic event is issued with the identities of those samples available. I know how to do the algorithmic parts of these behaviors... but how do I: A. Get the screen coordinates of a mouse click in this object B. Get the screen coordinates of all the data samples (to compare to the mouseclick) C. Highlight/unhighlight a sample point(s) (use a different color/circle it) D. Accumulate the list of screen coodinates generated during the drag I am guessing/hoping that tasks A&D may be done without interference with other callbacks, by doing the normal addMouseListener & addMouseMotionListener with my own MouseInputAdapter & MouseMotionAdapter. Is that so? If "event crosstalk" might be a problem, is it possible to put the object into a "select sample mode" temporarily, removing the existing mouse listeners, add our listeners, use them, and then restore the "default mode" by swapping the listeners back again? How would I access the default listeners? What about tasks B&C? I have to believe that other people are doing these things, and hope you will share your experiences with me. Thank you for your kindness, Barry "Dare to be naive" ...Buckminster Fuller Barry Wythoff Computational Design ArQule, Inc. 19 Presidential Way Woburn, MA 01801-5140 email: bwythoff@xxxxxxxxxx phone: 781-994-0388 fax: 781-376-6019
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