de.gsi.chart.axes.spi.format.DefaultLogFormatter Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of chartfx-chart Show documentation
Show all versions of chartfx-chart Show documentation
This charting library ${project.artifactId}- is an extension
in the spirit of Oracle's XYChart and performance/time-proven JDataViewer charting functionalities.
Emphasis was put on plotting performance for both large number of data points and real-time displays,
as well as scientific accuracies leading to error bar/surface plots, and other scientific plotting
features (parameter measurements, fitting, multiple axes, zoom, ...).
package de.gsi.chart.axes.spi.format;
import java.text.DecimalFormat;
import java.text.ParseException;
import de.gsi.chart.axes.Axis;
import de.gsi.chart.axes.TickUnitSupplier;
import de.gsi.chart.utils.NumberFormatter;
import javafx.util.StringConverter;
/**
* @author rstein
*/
public class DefaultLogFormatter extends AbstractFormatter {
private static final TickUnitSupplier DEFAULT_TICK_UNIT_SUPPLIER = new DefaultTickUnitSupplier();
private static final String FORMAT_SMALL_SCALE = "0.######";
private static final String FORMAT_LARGE_SCALE = "0.0E0";
public static final int DEFAULT_SMALL_LOG_AXIS = 4; // [orders of
// magnitude], e.g. '4'
// <-> [1,10000]
private final DecimalFormat formatterSmall = new DecimalFormat(DefaultLogFormatter.FORMAT_SMALL_SCALE);
private final DecimalFormat formatterLarge = new DecimalFormat(DefaultLogFormatter.FORMAT_LARGE_SCALE);
private MyDecimalFormat formatter = new MyDecimalFormat(formatterSmall);
/**
* Construct a DefaultFormatter for the given NumberAxis
*
* @param axis
* The axis to format tick marks for
*/
public DefaultLogFormatter(final Axis axis) {
super(axis);
}
/**
* Construct a DefaultFormatter for the given NumberAxis
*/
public DefaultLogFormatter() {
super();
setTickUnitSupplier(DefaultLogFormatter.DEFAULT_TICK_UNIT_SUPPLIER);
}
@Override
protected void rangeUpdated() {
final boolean smallScale = getLogRange() <= DefaultLogFormatter.DEFAULT_SMALL_LOG_AXIS;
final DecimalFormat oldFormatter = formatter.getFormatter();
if (smallScale) {
formatter.setFormatter(formatterSmall);
if (!formatter.equals(oldFormatter)) {
labelCache.clear();
}
return;
}
formatter.setFormatter(formatterLarge);
if (!formatter.equals(oldFormatter)) {
labelCache.clear();
}
}
@Override
protected double getLogRange() {
return Math.abs(Math.log10(rangeMin)) + Math.abs(Math.log10(rangeMax));
}
@Override
public String toString(final Number object) {
return labelCache.get(formatter, object.doubleValue());
}
@Override
public Number fromString(final String string) {
return null;
}
private class MyDecimalFormat extends StringConverter implements NumberFormatter {
DecimalFormat formatter;
public MyDecimalFormat(final DecimalFormat formatter) {
super();
this.formatter = formatter;
}
private void setFormatter(final DecimalFormat formatter) {
this.formatter = formatter;
}
private DecimalFormat getFormatter() {
return this.formatter;
}
@Override
public int getPrecision() {
return 0;
}
@Override
public NumberFormatter setPrecision(int precision) {
return this;
}
@Override
public boolean isExponentialForm() {
return false;
}
@Override
public NumberFormatter setExponentialForm(boolean state) {
return this;
}
@Override
public String toString(double val) {
return formatter.format(val);
}
@Override
public String toString(Number object) {
return formatter.format(object.doubleValue());
}
@Override
public Number fromString(String source) {
try {
return formatter.parse(source);
} catch (ParseException e) {
return Double.NaN;
}
}
}
}