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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;
import java.security.InvalidParameterException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import com.sun.javafx.css.converters.SizeConverter;
import de.gsi.chart.axes.AxisTransform;
import de.gsi.chart.axes.LogAxisType;
import de.gsi.chart.axes.TickUnitSupplier;
import de.gsi.chart.axes.spi.format.DefaultTickUnitSupplier;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.css.CssMetaData;
import javafx.css.SimpleStyleableDoubleProperty;
import javafx.css.Styleable;
import javafx.css.StyleableProperty;
import javafx.scene.chart.ValueAxis;
/**
* @author rstein
*/
public class LogarithmicAxis extends AbstractAxis {
public static final double DEFAULT_LOGARITHM_BASE = 10;
public static final double DEFAULT_LOG_MIN_VALUE = 1e-6;
public static final double DB20_LOGARITHM_BASE = Math.exp(Math.log10(10) / 20.0);
public static final double DB10_LOGARITHM_BASE = Math.exp(Math.log10(10) / 10.0);
public static final int DEFAULT_SMALL_LOG_AXIS = 4; // [orders of
// magnitude], e.g. '4'
// <-> [1,10000]
private static final int DEFAULT_TICK_COUNT = 9;
private static final TickUnitSupplier DEFAULT_TICK_UNIT_SUPPLIER = new DefaultTickUnitSupplier();
private final Cache cache = new Cache();
private boolean isUpdating = true;
/**
* Creates an {@link #autoRangingProperty() auto-ranging}
* LogarithmicAxis.
*/
public LogarithmicAxis() {
this("axis label", 0.0, 0.0, 5.0);
}
/**
* Creates a {@link #autoRangingProperty() non-auto-ranging}
* LogarithmicAxis with the given upper bound, lower bound and tick
* unit.
*
* @param lowerBound
* the {@link #lowerBoundProperty() lower bound} of the axis
* @param upperBound
* the {@link #upperBoundProperty() upper bound} of the axis
* @param tickUnit
* the tick unit, i.e. space between tick marks
*/
public LogarithmicAxis(final double lowerBound, final double upperBound, final double tickUnit) {
this(null, lowerBound, upperBound, tickUnit);
}
/**
* Create a {@link #autoRangingProperty() non-auto-ranging}
* LogarithmicAxis with the given upper bound, lower bound and tick
* unit.
*
* @param axisLabel
* the axis {@link #labelProperty() label}
* @param lowerBound
* the {@link #lowerBoundProperty() lower bound} of the axis
* @param upperBound
* the {@link #upperBoundProperty() upper bound} of the axis
* @param tickUnit
* the tick unit, i.e. space between tick marks
*/
public LogarithmicAxis(final String axisLabel, final double lowerBound, final double upperBound,
final double tickUnit) {
super(lowerBound, upperBound);
this.setLabel(axisLabel);
if (lowerBound >= upperBound || lowerBound == 0 && upperBound == 0) {
setAutoRanging(true);
}
setTickUnit(tickUnit);
setMinorTickCount(LogarithmicAxis.DEFAULT_TICK_COUNT);
super.currentLowerBound.addListener((evt, o, n) -> cache.updateCachedAxisVariables());
super.upperBoundProperty().addListener((evt, o, n) -> cache.updateCachedAxisVariables());
super.scaleProperty().addListener((evt, o, n) -> cache.updateCachedAxisVariables());
widthProperty().addListener((ch, o, n) -> cache.axisWidth = getWidth());
heightProperty().addListener((ch, o, n) -> cache.axisHeight = getHeight());
isUpdating = false;
}
private final SimpleStyleableDoubleProperty tickUnit = new SimpleStyleableDoubleProperty(
StyleableProperties.TICK_UNIT, this, "tickUnit", 5d) {
@Override
protected void invalidated() {
if (!(isAutoRanging() || isAutoGrowRanging())) {
invalidateRange();
requestAxisLayout();
}
}
};
/**
* The value between each major tick mark in data units. This is
* automatically set if we are auto-ranging.
*
* @return tickUnit property
*/
@Override
public DoubleProperty tickUnitProperty() {
return tickUnit;
}
/**
* Returns tick unit value expressed in data units.
*
* @return major tick unit value
*/
@Override
public double getTickUnit() {
return tickUnitProperty().get();
}
/**
* Sets the value of the {@link #tickUnitProperty()}.
*
* @param unit
* major tick unit
*/
@Override
public void setTickUnit(final double unit) {
tickUnitProperty().set(unit);
}
private final ObjectProperty tickUnitSupplier = new SimpleObjectProperty<>(this,
"tickUnitSupplier", LogarithmicAxis.DEFAULT_TICK_UNIT_SUPPLIER);
/**
* Strategy to compute major tick unit when auto-range is on or when axis
* bounds change. By default initialized to {@link DefaultTickUnitSupplier}.
*
* See {@link TickUnitSupplier} for more information about the expected
* behavior of the strategy.
*
*
* @return tickUnitSupplier property
*/
public ObjectProperty tickUnitSupplierProperty() {
return tickUnitSupplier;
}
/**
* Returns the value of the {@link #tickUnitSupplierProperty()}.
*
* @return the TickUnitSupplier
*/
public TickUnitSupplier getTickUnitSupplier() {
return tickUnitSupplierProperty().get();
}
/**
* Sets the value of the {@link #tickUnitSupplierProperty()}.
*
* @param supplier
* the tick unit supplier. If {@code null}, the default one will
* be used
*/
public void setTickUnitSupplier(final TickUnitSupplier supplier) {
tickUnitSupplierProperty().set(supplier);
}
/**
* @return {@code true} if logarithmic axis, {@code false} otherwise
*/
@Override
public boolean isLogAxis() {
return true;
}
/**
* @return the log axis Type @see LogAxisType
*/
@Override
public LogAxisType getLogAxisType() {
return LogAxisType.LINEAR_SCALE;
}
private final DoubleProperty logarithmBase = new SimpleDoubleProperty(this, "logarithmBase",
LogarithmicAxis.DEFAULT_LOGARITHM_BASE) {
@Override
protected void invalidated() {
if (get() <= 1) {
throw new IllegalArgumentException("logarithmBase must be grater than 1");
}
invalidateRange();
requestAxisLayout();
}
};
/**
* Base of the logarithm used by the axis, must be grater than 1.
*
* Default value: 10
*
*
* @return base of the logarithm
*/
public DoubleProperty logarithmBaseProperty() {
return logarithmBase;
}
/**
* Returns the value of the {@link #logarithmBaseProperty()}.
*
* @return base of the logarithm
*/
public double getLogarithmBase() {
return logarithmBaseProperty().get();
}
/**
* Sets value of the {@link #logarithmBaseProperty()}.
*
* @param value
* base of the logarithm, value > 1
*/
public void setLogarithmBase(final double value) {
logarithmBaseProperty().set(value);
}
private double log(final double value) {
if (value <= 0) {
return Double.NaN;
}
return Math.log10(value) / cache.logBase;
}
private double pow(final double value) {
return Math.pow(getLogarithmBase(), value);
}
@Override
protected void setRange(final AxisRange range, final boolean animate) {
super.setRange(range, animate);
setTickUnit(range.getTickUnit());
}
@Override
protected List calculateMajorTickValues(final double axisLength, final AxisRange range) {
if (!(range instanceof AxisRange)) {
throw new InvalidParameterException("unknown range class:" + range.getClass().getCanonicalName());
}
final AxisRange rangeImpl = range;
final List tickValues = new ArrayList<>();
if (rangeImpl.getLowerBound() >= rangeImpl.getUpperBound()) {
return Arrays.asList(rangeImpl.getLowerBound());
}
double exp = Math.ceil(log(rangeImpl.getLowerBound()));
for (double tickValue = pow(exp); tickValue <= rangeImpl.getUpperBound(); tickValue = pow(++exp)) {
tickValues.add(tickValue);
}
return tickValues;
}
@Override
protected List calculateMinorTickValues() {
if (getMinorTickCount() <= 0) {
return Collections.emptyList();
}
final List minorTickMarks = new ArrayList<>();
final double lowerBound = getLowerBound();
final double upperBound = getUpperBound();
double exp = Math.floor(log(lowerBound));
for (double majorTick = pow(exp); majorTick < upperBound; majorTick = pow(++exp)) {
final double nextMajorTick = pow(exp + 1);
final double minorUnit = (nextMajorTick - majorTick) / getMinorTickCount();
for (double minorTick = majorTick + minorUnit; minorTick < nextMajorTick; minorTick += minorUnit) {
if (minorTick >= lowerBound && minorTick <= upperBound) {
minorTickMarks.add(minorTick);
}
}
}
return minorTickMarks;
}
@Override
protected AxisRange autoRange(final double minValue, final double maxValue, final double length,
final double labelSize) {
double min = minValue;
final double max = maxValue;
// sanitise range if < 0
if (min <= 0) {
min = LogarithmicAxis.DEFAULT_LOG_MIN_VALUE;
isUpdating = true;
setLowerBound(LogarithmicAxis.DEFAULT_LOG_MIN_VALUE);
isUpdating = false;
}
final double paddingScale = 1.0 + getAutoRangePadding();
final double paddedMin = min / paddingScale;
final double paddedMax = max * paddingScale;
return computeRange(paddedMin, paddedMax, length, labelSize);
}
@Override
protected AxisRange computeRange(final double min, final double max, final double axisLength,
final double labelSize) {
double minValue = min;
double maxValue = max;
if ((isAutoRanging() || isAutoGrowRanging()) && isAutoRangeRounding()) {
minValue = minValue <= 0 ? LogarithmicAxis.DEFAULT_LOG_MIN_VALUE : pow(Math.floor(log(minValue)));
maxValue = pow(Math.ceil(log(maxValue)));
}
final double newScale = calculateNewScale(axisLength, minValue, maxValue);
return new AxisRange(minValue, maxValue, axisLength, newScale, tickUnit.get());
}
/**
* Computes the preferred tick unit based on the upper/lower bounds and the
* length of the axis in screen coordinates.
*
* @param axisLength
* the length in screen coordinates
* @return the tick unit
*/
@Override
public double computePreferredTickUnit(final double axisLength) {
return tickUnit.get();
}
/**
* Get the display position along this axis for a given value. If the value
* is not in the current range, the returned value will be an extrapolation
* of the display position. -- cached double optimised version (shaves of
* 50% on delays)
*
* @param value
* The data value to work out display position for
* @return display position
*/
@Override
public double getDisplayPosition(final double value) {
final double valueLogOffset = log(value) - cache.lowerBoundLog;
if (cache.isVerticalAxis) {
return cache.axisHeight - valueLogOffset * cache.logScaleLengthInv;
}
return valueLogOffset * cache.logScaleLengthInv;
}
/**
* Get the data value for the given display position on this axis. If the
* axis is a CategoryAxis this will be the nearest value. -- cached double
* optimised version (shaves of 50% on delays)
*
* @param displayPosition
* A pixel position on this axis
* @return the nearest data value to the given pixel position or null if not
* on axis;
*/
@Override
public double getValueForDisplay(final double displayPosition) {
if (cache.isVerticalAxis) {
final double height = cache.axisHeight;
return pow(cache.lowerBoundLog + (height - displayPosition) / height * cache.logScaleLength);
}
return pow(cache.lowerBoundLog + displayPosition / cache.axisWidth * cache.logScaleLength);
}
/**
* Get the display position of the zero line along this axis.
*
* @return display position or Double.NaN if zero is not in current range;
*/
@Override
public double getZeroPosition() {
return getDisplayPosition(cache.localCurrentLowerBound);
}
/**
* Checks if the given value is plottable on this axis
*
* @param value
* The value to check if its on axis
* @return true if the given value is plottable on this axis
*/
@Override
public boolean isValueOnAxis(final double value) {
return value >= getLowerBound() && value <= getUpperBound();
}
// -------------- STYLESHEET HANDLING
// ------------------------------------------------------------------------------
private static class StyleableProperties {
private StyleableProperties() {
}
private static final CssMetaData TICK_UNIT = new CssMetaData(
"-fx-tick-unit", SizeConverter.getInstance(), 5.0) {
@Override
public boolean isSettable(final LogarithmicAxis axis) {
return axis.tickUnit == null || !axis.tickUnit.isBound();
}
@SuppressWarnings("unchecked")
@Override
public StyleableProperty getStyleableProperty(final LogarithmicAxis axis) {
return (StyleableProperty) axis.tickUnitProperty();
}
};
private static final List> STYLEABLES;
static {
final List> styleables = new ArrayList<>(
ValueAxis.getClassCssMetaData());
styleables.add(StyleableProperties.TICK_UNIT);
STYLEABLES = Collections.unmodifiableList(styleables);
}
}
public static List> getClassCssMetaData() {
return StyleableProperties.STYLEABLES;
}
@Override
public List> getCssMetaData() {
return LogarithmicAxis.getClassCssMetaData();
}
@Override
public void requestAxisLayout() {
if (isUpdating) {
return;
}
super.requestAxisLayout();
}
protected class Cache {
protected double localCurrentLowerBound;
protected double localCurrentUpperBound;
protected double upperBoundLog;
protected double lowerBoundLog;
protected double logScaleLength;
protected double logScaleLengthInv;
protected boolean isVerticalAxis;
protected double axisWidth;
protected double axisHeight;
protected double logBase;
private void updateCachedAxisVariables() {
localCurrentLowerBound = currentLowerBound.get();
localCurrentUpperBound = LogarithmicAxis.super.getUpperBound();
upperBoundLog = log(getUpperBound());
lowerBoundLog = log(getLowerBound());
logScaleLength = upperBoundLog - lowerBoundLog;
logScaleLengthInv = 1.0 / logScaleLength;
if (getSide() != null) {
isVerticalAxis = getSide().isVertical();
}
if (isVerticalAxis) {
logScaleLengthInv = axisHeight / logScaleLength;
} else {
logScaleLengthInv = axisWidth / logScaleLength;
}
logBase = Math.log10(getLogarithmBase());
}
}
@Override
public AxisTransform getAxisTransform() {
return null;
}
}