[SOLVED] LogarithmicAxis zoom

[Alex4924]

Hello everybody,

I use the LogarithmicAxis in my chart, and I don't want ot display values below zero when i zoom out.

Is it possible?

Thanks

[maryan]

I think that you can try to override zoomOutBoth method from ChartPanel.

[mkrauskopf]

Or you might do something like (tweak to your needs):

Code: Select all

    private static LogarithmicAxis newZeroBasedLogAxis() {
        LogarithmicAxis axis = new LogarithmicAxis(null /* maybe title */) {
            @Override
            public Range getRange() {
                Range sRange = super.getRange();
                // ensure lowerBound < upperBound to prevent exception
                return new Range(
                        Math.max(0, sRange.getLowerBound()),
                        Math.max(1e-8, sRange.getUpperBound()));
            }
        };
        axis.setAllowNegativesFlag(true);
        // ... init as you wish ...
        return axis;
    }

    private void aMethod() {
        .....
        XYPlot plot = (XYPlot) chart.getPlot();
        plot.setDomainAxis(newZeroBasedLogAxis());
        plot.setRangeAxis(newZeroBasedLogAxis());
        .....
    }

Cheers,
- m.

[Alex4924]

Thank a lot,

my problem is almost solved, Do you know how to add tick marks, for example 1000 -> 1KBq?

[Alex4924]

My probleme is solved, Thank you mkrauskopf!!

[maryan]

Thank a lot,

my problem is almost solved, Do you know how to add tick marks, for example 1000 -> 1KBq?

How did you solve this?

[Alex4924]

I use the méthods

Code: Select all

protected List refreshTicksHorizontal(Graphics2D g2,Rectangle2D dataArea,RectangleEdge edge)

and

Code: Select all

    protected List refreshTicksVertical(Graphics2D g2,Rectangle2D dataArea,RectangleEdge edge)

in the class LogarithmicAxis