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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Hi Maohai...I wonder if the only issue with using "point mode" is the size of the points, then perhaps you could use "setPointSize()" to make them show up larger? (display.getGraphicsModeCOntrol().setPointSize(5.f) for example)
tom maohai huang wrote:
One user requirement is to plot a million points and pick out interesting part to zoom in until individual points are resolved on the screen. From my test the fasted way to draw a large number of points is plotting in (x->y) with setPointMode(true). Each point then is a pixel. I suppose this is not the same as drawing everypoing with VisADPointArray? Anyways in this mode, each point is so small that the out liers are easy to overlook. So I start experimenting with drawing with shapes. There is precisely one shape at a time, though it is drawn a million times from the user point of view. Now it looks like there is no way to get around having at least an array of indices of large size created, and having this array referenced when each point is plotted. Yes it is possible to extend what visad does by default in order to save memory and execution time. but I am concerned by being tied too much to the unexposed internals of visad to gain performance. maohai
-- Tom Whittaker (tomw@xxxxxxxxxxxxx) University of Wisconsin-Madison Space Science and Engineering Center Cooperative Institute for Meteorological Satellite Studies Phone/VoiceMail: 608.262.2759
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