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Editorial Team
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Asked: 2026-05-14T07:00:04+00:00

I have a large number of data points which are two dimensional coordinates with

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I have a large number of data points which are two dimensional coordinates with non-integer values (floats). I am looking for a Java library that can help me plot these points, allowing for custom point size, color, and labels. Further, I would like the user to be able to interact with the points with panning and zooming, and I want to be able to capture KeyEvents from the user.

Processing looks great for what I want, but I don’t want to do everything from scratch. Is there a better solution?

Thanks in advance.

Edit: There are about 2k points.

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1 Answer

  1. Editorial Team

    Depends. I recently did app that displays large 2d datasets with JFreechart, but I ended making datasets smaller to have performance.

    I displayed matrices of points, that changed in time (when new data arrives) with 1 second refresh time (so every one second chart is repainted).

    For matries 256 x 256 it is OK on normal user computer. If the matrix is ~350 pts it gets rough (user sees lags in the GUI), but it is usable, if the matrix is 1024 x 1024 app is unusable.

    I did chart drawing ind EDT, but still even if I took it into different thread — rendering would still eat processor power.

    So depending on data set size — you might want to use JFreeChart.

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