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Prefuse Java Bar Graphs


By : Dheeraj
Date : October 17 2020, 11:12 AM
may help you . JFreeChart is an excellent graphing package, has a ton of documentation, and is regularly updated. I would recommend checking this out (unless there is some specific reason you are using prefuse).
code :


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How do I create a bar chart using the Java prefuse library?


By : Maz
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I think I should probably point out how I did this - Stack Overflow is supposed to be a repository too, after all. Earlier in the code was the following:
code :
m_vis.setRendererFactory(new RendererFactory() {
    Renderer yAxisRenderer = new AxisRenderer(Constants.LEFT, Constants.TOP);
    Renderer xAxisRenderer = new AxisRenderer(Constants.CENTER, Constants.FAR_BOTTOM);
    Renderer barRenderer = new ShapeRenderer();

    public Renderer getRenderer(VisualItem item) {
        return item.isInGroup("yAxis") ? yAxisRenderer :
               item.isInGroup("xAxis") ? xAxisRenderer :
               barRenderer;
    }
});
m_vis.setRendererFactory(new RendererFactory() {
    Renderer yAxisRenderer = new AxisRenderer(Constants.LEFT, Constants.TOP);
    Renderer xAxisRenderer = new AxisRenderer(Constants.CENTER, Constants.FAR_BOTTOM);
    Renderer barRenderer = new ShapeRenderer() {
        protected Shape getRawShape(VisualItem item) {
            double x = item.getX();
            double y = item.getY();
            if (Double.isNaN(x) || Double.isInfinite(x))
                x = getInsets().left + axisWidth + totalBarWidth / 2;
            if (Double.isNaN(y) || Double.isInfinite(y))
                y = 0;

            double width = totalBarWidth / (barCount + 1) - barGap;
            double height = getHeight() - getInsets().bottom - axisHeight - y;
            x -= width / 2;

            return rectangle(x, y, width, height);
        }
    };

    public Renderer getRenderer(VisualItem item) {
        return item.isInGroup("yAxis") ? yAxisRenderer :
               item.isInGroup("xAxis") ? xAxisRenderer :
               barRenderer;
    }
});

Is there a Java alternative to Prefuse that is under active development?


By : user3122397
Date : March 29 2020, 07:55 AM
it helps some times Protovis is the successor of Prefuse (and now, D3 is under active development). Protovis-Java is a partial implementation of the Protovis toolkit in Java. There's a nice example gallery, but I have no experience with the Java side.
As an alternative, you might consider Processing, with some example of use in Java here, or its Javascript counterpart, Processing.js. There were even a port for Scala + Processing: Spde.

How to visualize a Prefuse (Java) Table correctly?


By : Ebola Zaire
Date : March 29 2020, 07:55 AM
may help you . You want to visualize your table in a scatter plot with PIT on the x-axis, Value on the y-axis, and Car as the color of the marks (= rectangles).
If I understood you correctly, you see the axis labels but no marks.
code :
ColorAction color = new ColorAction("data", VisualItem.STROKECOLOR,
                ColorLib.rgb(100, 100, 255));
ColorAction color = new DataColorAction("data", "Car", 
                Constants.NOMINAL, VisualItem.FILLCOLOR);
y_axis.setRangeModel(new NumberRangeModel(0, 40, 0, 40)); 

How to update Prefuse or JUNG graphs when their source GraphML files are modified?


By : vivekanand mishra
Date : March 29 2020, 07:55 AM
I wish this help you Check the source file "periodically". If you hang on to a handle f for the file, you can query f.lastModified() and if the other program has done its dirty work since last you checked, update! Similar solutions apply if the other program were writing only an update file (which would be sensible if you have the power to make that change - less file to read, know exactly what to change in your model, etc).
"Periodically" is a bit of sticky wicket - your case is probably simple enough that "every X (milli)seconds, check" will do. Periodic tasks in Java can be implemented in a variety of ways - see, e.g. this other question.

How can I save a Prefuse generated graph as a pdf in java?


By : Paulo R
Date : March 29 2020, 07:55 AM
it fixes the issue prefuse draws the graph visualization in a Display, which is a subclass of JComponent.
Thus you can apply tutorials to save Swing components on PDF:
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