JFreeChart Large values - charts

Question

Hello I have small issue.
Got such chart with kinda large values. Is there any EASY way to fix that? I would love to see
numbers something as 1e15.

Answer 1

Coming in the 1.0.18 release is a new TickUnitSource implementation that should resolve this problem:
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2014, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* -------------------------
* NumberTickUnitSource.java
* -------------------------
* (C) Copyright 2014, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes
* -------
* 18-Mar-2014 : Version 1 (DG);
*
*/
package org.jfree.chart.axis;
import java.io.Serializable;
import java.text.DecimalFormat;
import java.text.NumberFormat;
/**
* A tick unit source implementation that returns NumberTickUnit instances
* that are multiples of 1 or 5 times some power of 10.
*
* #since 1.0.18
*/
public class NumberTickUnitSource implements TickUnitSource, Serializable {
private int power = 0;
private int factor = 1;
/**
* Creates a new instance.
*/
public NumberTickUnitSource() {
this.power = 0;
this.factor = 1;
}
#Override
public TickUnit getLargerTickUnit(TickUnit unit) {
TickUnit t = getCeilingTickUnit(unit);
if (t.equals(unit)) {
next();
t = new NumberTickUnit(getTickSize(), getTickLabelFormat(),
getMinorTickCount());
}
return t;
}
#Override
public TickUnit getCeilingTickUnit(TickUnit unit) {
return getCeilingTickUnit(unit.getSize());
}
#Override
public TickUnit getCeilingTickUnit(double size) {
this.power = (int) Math.ceil(Math.log10(size));
this.factor = 1;
return new NumberTickUnit(getTickSize(), getTickLabelFormat(),
getMinorTickCount());
}
private boolean next() {
if (factor == 1) {
factor = 5;
return true;
}
if (factor == 5) {
power++;
factor = 1;
return true;
}
throw new IllegalStateException("We should never get here.");
}
private boolean previous() {
if (factor == 1) {
factor = 5;
power--;
return true;
}
if (factor == 5) {
factor = 1;
return true;
}
throw new IllegalStateException("We should never get here.");
}
private double getTickSize() {
return this.factor * Math.pow(10.0, this.power);
}
private DecimalFormat dfNeg4 = new DecimalFormat("0.0000");
private DecimalFormat dfNeg3 = new DecimalFormat("0.000");
private DecimalFormat dfNeg2 = new DecimalFormat("0.00");
private DecimalFormat dfNeg1 = new DecimalFormat("0.0");
private DecimalFormat df0 = new DecimalFormat("#,##0");
private NumberFormat getTickLabelFormat() {
if (power == -4) {
return dfNeg4;
}
if (power == -3) {
return dfNeg3;
}
if (power == -2) {
return dfNeg2;
}
if (power == -1) {
return dfNeg1;
}
if (power >= 0 && power <= 6) {
return df0;
}
return new DecimalFormat("0.#E0");
}
private int getMinorTickCount() {
if (factor == 1) {
return 10;
} else if (factor == 5) {
return 5;
}
return 0;
}
#Override
public boolean equals(Object obj) {
return (obj instanceof NumberTickUnitSource);
}
}
Add this to your code:
NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
rangeAxis.setStandardTickUnits(new NumberTickUnitSource());