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/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-present, by David Gilbert 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.]
*
* ---------------
* NumberAxis.java
* ---------------
* (C) Copyright 2000-present, by David Gilbert and Contributors.
*
* Original Author: David Gilbert;
* Contributor(s): Laurence Vanhelsuwe;
* Peter Kolb (patches 1934255 and 2603321);
*
*/
package org.jfree.chart.axis;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.awt.font.LineMetrics;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.Objects;
import org.jfree.chart.event.AxisChangeEvent;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.ValueAxisPlot;
import org.jfree.chart.ui.RectangleEdge;
import org.jfree.chart.ui.RectangleInsets;
import org.jfree.chart.ui.TextAnchor;
import org.jfree.chart.util.Args;
import org.jfree.data.Range;
import org.jfree.data.RangeType;
/**
* An axis for displaying numerical data.
*
* If the axis is set up to automatically determine its range to fit the data,
* you can ensure that the range includes zero (statisticians usually prefer
* this) by setting the {@code autoRangeIncludesZero} flag to
* {@code true}.
*
* The {@code NumberAxis} class has a mechanism for automatically
* selecting a tick unit that is appropriate for the current axis range.
*/
public class NumberAxis extends ValueAxis implements Cloneable, Serializable {
/** For serialization. */
private static final long serialVersionUID = 2805933088476185789L;
/** The default value for the autoRangeIncludesZero flag. */
public static final boolean DEFAULT_AUTO_RANGE_INCLUDES_ZERO = true;
/** The default value for the autoRangeStickyZero flag. */
public static final boolean DEFAULT_AUTO_RANGE_STICKY_ZERO = true;
/** The default tick unit. */
public static final NumberTickUnit DEFAULT_TICK_UNIT = new NumberTickUnit(
1.0, new DecimalFormat("0"));
/** The default setting for the vertical tick labels flag. */
public static final boolean DEFAULT_VERTICAL_TICK_LABELS = false;
/**
* The range type (can be used to force the axis to display only positive
* values or only negative values).
*/
private RangeType rangeType;
/**
* A flag that affects the axis range when the range is determined
* automatically. If the auto range does NOT include zero and this flag
* is TRUE, then the range is changed to include zero.
*/
private boolean autoRangeIncludesZero;
/**
* A flag that affects the size of the margins added to the axis range when
* the range is determined automatically. If the value 0 falls within the
* margin and this flag is TRUE, then the margin is truncated at zero.
*/
private boolean autoRangeStickyZero;
/** The tick unit for the axis. */
private NumberTickUnit tickUnit;
/** The override number format. */
private NumberFormat numberFormatOverride;
/** An optional band for marking regions on the axis. */
private MarkerAxisBand markerBand;
/**
* Default constructor.
*/
public NumberAxis() {
this(null);
}
/**
* Constructs a number axis, using default values where necessary.
*
* @param label the axis label ({@code null} permitted).
*/
public NumberAxis(String label) {
super(label, NumberAxis.createStandardTickUnits());
this.rangeType = RangeType.FULL;
this.autoRangeIncludesZero = DEFAULT_AUTO_RANGE_INCLUDES_ZERO;
this.autoRangeStickyZero = DEFAULT_AUTO_RANGE_STICKY_ZERO;
this.tickUnit = DEFAULT_TICK_UNIT;
this.numberFormatOverride = null;
this.markerBand = null;
}
/**
* Returns the axis range type.
*
* @return The axis range type (never {@code null}).
*
* @see #setRangeType(RangeType)
*/
public RangeType getRangeType() {
return this.rangeType;
}
/**
* Sets the axis range type.
*
* @param rangeType the range type ({@code null} not permitted).
*
* @see #getRangeType()
*/
public void setRangeType(RangeType rangeType) {
Args.nullNotPermitted(rangeType, "rangeType");
this.rangeType = rangeType;
notifyListeners(new AxisChangeEvent(this));
}
/**
* Returns the flag that indicates whether or not the automatic axis range
* (if indeed it is determined automatically) is forced to include zero.
*
* @return The flag.
*/
public boolean getAutoRangeIncludesZero() {
return this.autoRangeIncludesZero;
}
/**
* Sets the flag that indicates whether or not the axis range, if
* automatically calculated, is forced to include zero.
*
* If the flag is changed to {@code true}, the axis range is
* recalculated.
*
* Any change to the flag will trigger an {@link AxisChangeEvent}.
*
* @param flag the new value of the flag.
*
* @see #getAutoRangeIncludesZero()
*/
public void setAutoRangeIncludesZero(boolean flag) {
if (this.autoRangeIncludesZero != flag) {
this.autoRangeIncludesZero = flag;
if (isAutoRange()) {
autoAdjustRange();
}
notifyListeners(new AxisChangeEvent(this));
}
}
/**
* Returns a flag that affects the auto-range when zero falls outside the
* data range but inside the margins defined for the axis.
*
* @return The flag.
*
* @see #setAutoRangeStickyZero(boolean)
*/
public boolean getAutoRangeStickyZero() {
return this.autoRangeStickyZero;
}
/**
* Sets a flag that affects the auto-range when zero falls outside the data
* range but inside the margins defined for the axis.
*
* @param flag the new flag.
*
* @see #getAutoRangeStickyZero()
*/
public void setAutoRangeStickyZero(boolean flag) {
if (this.autoRangeStickyZero != flag) {
this.autoRangeStickyZero = flag;
if (isAutoRange()) {
autoAdjustRange();
}
notifyListeners(new AxisChangeEvent(this));
}
}
/**
* Returns the tick unit for the axis.
*
* Note: if the {@code autoTickUnitSelection} flag is
* {@code true} the tick unit may be changed while the axis is being
* drawn, so in that case the return value from this method may be
* irrelevant if the method is called before the axis has been drawn.
*
* @return The tick unit for the axis.
*
* @see #setTickUnit(NumberTickUnit)
* @see ValueAxis#isAutoTickUnitSelection()
*/
public NumberTickUnit getTickUnit() {
return this.tickUnit;
}
/**
* Sets the tick unit for the axis and sends an {@link AxisChangeEvent} to
* all registered listeners. A side effect of calling this method is that
* the "auto-select" feature for tick units is switched off (you can
* restore it using the {@link ValueAxis#setAutoTickUnitSelection(boolean)}
* method).
*
* @param unit the new tick unit ({@code null} not permitted).
*
* @see #getTickUnit()
* @see #setTickUnit(NumberTickUnit, boolean, boolean)
*/
public void setTickUnit(NumberTickUnit unit) {
// defer argument checking...
setTickUnit(unit, true, true);
}
/**
* Sets the tick unit for the axis and, if requested, sends an
* {@link AxisChangeEvent} to all registered listeners. In addition, an
* option is provided to turn off the "auto-select" feature for tick units
* (you can restore it using the
* {@link ValueAxis#setAutoTickUnitSelection(boolean)} method).
*
* @param unit the new tick unit ({@code null} not permitted).
* @param notify notify listeners?
* @param turnOffAutoSelect turn off the auto-tick selection?
*/
public void setTickUnit(NumberTickUnit unit, boolean notify,
boolean turnOffAutoSelect) {
Args.nullNotPermitted(unit, "unit");
this.tickUnit = unit;
if (turnOffAutoSelect) {
setAutoTickUnitSelection(false, false);
}
if (notify) {
notifyListeners(new AxisChangeEvent(this));
}
}
/**
* Returns the number format override. If this is non-null, then it will
* be used to format the numbers on the axis.
*
* @return The number formatter (possibly {@code null}).
*
* @see #setNumberFormatOverride(NumberFormat)
*/
public NumberFormat getNumberFormatOverride() {
return this.numberFormatOverride;
}
/**
* Sets the number format override. If this is non-null, then it will be
* used to format the numbers on the axis.
*
* @param formatter the number formatter ({@code null} permitted).
*
* @see #getNumberFormatOverride()
*/
public void setNumberFormatOverride(NumberFormat formatter) {
this.numberFormatOverride = formatter;
notifyListeners(new AxisChangeEvent(this));
}
/**
* Returns the (optional) marker band for the axis.
*
* @return The marker band (possibly {@code null}).
*
* @see #setMarkerBand(MarkerAxisBand)
*/
public MarkerAxisBand getMarkerBand() {
return this.markerBand;
}
/**
* Sets the marker band for the axis.
*
* The marker band is optional, leave it set to {@code null} if you
* don't require it.
*
* @param band the new band ({@code null} permitted).
*
* @see #getMarkerBand()
*/
public void setMarkerBand(MarkerAxisBand band) {
this.markerBand = band;
notifyListeners(new AxisChangeEvent(this));
}
/**
* Configures the axis to work with the specified plot. If the axis has
* auto-scaling, then sets the maximum and minimum values.
*/
@Override
public void configure() {
if (isAutoRange()) {
autoAdjustRange();
}
}
/**
* Rescales the axis to ensure that all data is visible.
*/
@Override
protected void autoAdjustRange() {
Plot plot = getPlot();
if (plot == null) {
return; // no plot, no data
}
if (plot instanceof ValueAxisPlot) {
ValueAxisPlot vap = (ValueAxisPlot) plot;
Range r = vap.getDataRange(this);
if (r == null) {
r = getDefaultAutoRange();
}
double upper = r.getUpperBound();
double lower = r.getLowerBound();
if (this.rangeType == RangeType.POSITIVE) {
lower = Math.max(0.0, lower);
upper = Math.max(0.0, upper);
}
else if (this.rangeType == RangeType.NEGATIVE) {
lower = Math.min(0.0, lower);
upper = Math.min(0.0, upper);
}
if (getAutoRangeIncludesZero()) {
lower = Math.min(lower, 0.0);
upper = Math.max(upper, 0.0);
}
double range = upper - lower;
// if fixed auto range, then derive lower bound...
double fixedAutoRange = getFixedAutoRange();
if (fixedAutoRange > 0.0) {
lower = upper - fixedAutoRange;
}
else {
// ensure the autorange is at least in size...
double minRange = getAutoRangeMinimumSize();
if (range < minRange) {
double expand = (minRange - range) / 2;
upper = upper + expand;
lower = lower - expand;
if (lower == upper) { // see bug report 1549218
double adjust = Math.abs(lower) / 10.0;
lower = lower - adjust;
upper = upper + adjust;
}
if (this.rangeType == RangeType.POSITIVE) {
if (lower < 0.0) {
upper = upper - lower;
lower = 0.0;
}
}
else if (this.rangeType == RangeType.NEGATIVE) {
if (upper > 0.0) {
lower = lower - upper;
upper = 0.0;
}
}
}
if (getAutoRangeStickyZero()) {
if (upper <= 0.0) {
upper = Math.min(0.0, upper + getUpperMargin() * range);
}
else {
upper = upper + getUpperMargin() * range;
}
if (lower >= 0.0) {
lower = Math.max(0.0, lower - getLowerMargin() * range);
}
else {
lower = lower - getLowerMargin() * range;
}
}
else {
upper = upper + getUpperMargin() * range;
lower = lower - getLowerMargin() * range;
}
}
setRange(new Range(lower, upper), false, false);
}
}
/**
* Converts a data value to a coordinate in Java2D space, assuming that the
* axis runs along one edge of the specified dataArea.
*
* Note that it is possible for the coordinate to fall outside the plotArea.
*
* @param value the data value.
* @param area the area for plotting the data.
* @param edge the axis location.
*
* @return The Java2D coordinate.
*
* @see #java2DToValue(double, Rectangle2D, RectangleEdge)
*/
@Override
public double valueToJava2D(double value, Rectangle2D area,
RectangleEdge edge) {
Range range = getRange();
double axisMin = range.getLowerBound();
double axisMax = range.getUpperBound();
double min = 0.0;
double max = 0.0;
if (RectangleEdge.isTopOrBottom(edge)) {
min = area.getX();
max = area.getMaxX();
}
else if (RectangleEdge.isLeftOrRight(edge)) {
max = area.getMinY();
min = area.getMaxY();
}
if (isInverted()) {
return max
- ((value - axisMin) / (axisMax - axisMin)) * (max - min);
}
else {
return min
+ ((value - axisMin) / (axisMax - axisMin)) * (max - min);
}
}
/**
* Converts a coordinate in Java2D space to the corresponding data value,
* assuming that the axis runs along one edge of the specified dataArea.
*
* @param java2DValue the coordinate in Java2D space.
* @param area the area in which the data is plotted.
* @param edge the location.
*
* @return The data value.
*
* @see #valueToJava2D(double, Rectangle2D, RectangleEdge)
*/
@Override
public double java2DToValue(double java2DValue, Rectangle2D area,
RectangleEdge edge) {
Range range = getRange();
double axisMin = range.getLowerBound();
double axisMax = range.getUpperBound();
double min = 0.0;
double max = 0.0;
if (RectangleEdge.isTopOrBottom(edge)) {
min = area.getX();
max = area.getMaxX();
}
else if (RectangleEdge.isLeftOrRight(edge)) {
min = area.getMaxY();
max = area.getY();
}
if (isInverted()) {
return axisMax
- (java2DValue - min) / (max - min) * (axisMax - axisMin);
}
else {
return axisMin
+ (java2DValue - min) / (max - min) * (axisMax - axisMin);
}
}
/**
* Calculates the value of the lowest visible tick on the axis.
*
* @return The value of the lowest visible tick on the axis.
*
* @see #calculateHighestVisibleTickValue()
*/
protected double calculateLowestVisibleTickValue() {
double unit = getTickUnit().getSize();
double index = Math.ceil(getRange().getLowerBound() / unit);
return index * unit;
}
/**
* Calculates the value of the highest visible tick on the axis.
*
* @return The value of the highest visible tick on the axis.
*
* @see #calculateLowestVisibleTickValue()
*/
protected double calculateHighestVisibleTickValue() {
double unit = getTickUnit().getSize();
double index = Math.floor(getRange().getUpperBound() / unit);
return index * unit;
}
/**
* Calculates the number of visible ticks.
*
* @return The number of visible ticks on the axis.
*/
protected int calculateVisibleTickCount() {
double unit = getTickUnit().getSize();
Range range = getRange();
return (int) (Math.floor(range.getUpperBound() / unit)
- Math.ceil(range.getLowerBound() / unit) + 1);
}
/**
* Draws the axis on a Java 2D graphics device (such as the screen or a
* printer).
*
* @param g2 the graphics device ({@code null} not permitted).
* @param cursor the cursor location.
* @param plotArea the area within which the axes and data should be drawn
* ({@code null} not permitted).
* @param dataArea the area within which the data should be drawn
* ({@code null} not permitted).
* @param edge the location of the axis ({@code null} not permitted).
* @param plotState collects information about the plot
* ({@code null} permitted).
*
* @return The axis state (never {@code null}).
*/
@Override
public AxisState draw(Graphics2D g2, double cursor, Rectangle2D plotArea,
Rectangle2D dataArea, RectangleEdge edge,
PlotRenderingInfo plotState) {
AxisState state;
// if the axis is not visible, don't draw it...
if (!isVisible()) {
state = new AxisState(cursor);
// even though the axis is not visible, we need ticks for the
// gridlines...
List ticks = refreshTicks(g2, state, dataArea, edge);
state.setTicks(ticks);
return state;
}
// draw the tick marks and labels...
state = drawTickMarksAndLabels(g2, cursor, plotArea, dataArea, edge);
if (getAttributedLabel() != null) {
state = drawAttributedLabel(getAttributedLabel(), g2, plotArea,
dataArea, edge, state);
} else {
state = drawLabel(getLabel(), g2, plotArea, dataArea, edge, state);
}
createAndAddEntity(cursor, state, dataArea, edge, plotState);
return state;
}
/**
* Creates the standard tick units.
*
* If you don't like these defaults, create your own instance of TickUnits
* and then pass it to the setStandardTickUnits() method in the
* NumberAxis class.
*
* @return The standard tick units.
*
* @see #setStandardTickUnits(TickUnitSource)
* @see #createIntegerTickUnits()
*/
public static TickUnitSource createStandardTickUnits() {
return new NumberTickUnitSource();
}
/**
* Returns a collection of tick units for integer values.
*
* @return A collection of tick units for integer values.
*
* @see #setStandardTickUnits(TickUnitSource)
* @see #createStandardTickUnits()
*/
public static TickUnitSource createIntegerTickUnits() {
return new NumberTickUnitSource(true);
}
/**
* Creates a collection of standard tick units. The supplied locale is
* used to create the number formatter (a localised instance of
* {@code NumberFormat}).
*
* If you don't like these defaults, create your own instance of
* {@link TickUnits} and then pass it to the
* {@code setStandardTickUnits()} method.
*
* @param locale the locale.
*
* @return A tick unit collection.
*
* @see #setStandardTickUnits(TickUnitSource)
*/
public static TickUnitSource createStandardTickUnits(Locale locale) {
NumberFormat numberFormat = NumberFormat.getNumberInstance(locale);
return new NumberTickUnitSource(false, numberFormat);
}
/**
* Returns a collection of tick units for integer values.
* Uses a given Locale to create the DecimalFormats.
*
* @param locale the locale to use to represent Numbers.
*
* @return A collection of tick units for integer values.
*
* @see #setStandardTickUnits(TickUnitSource)
*/
public static TickUnitSource createIntegerTickUnits(Locale locale) {
NumberFormat numberFormat = NumberFormat.getNumberInstance(locale);
return new NumberTickUnitSource(true, numberFormat);
}
/**
* Estimates the maximum tick label height.
*
* @param g2 the graphics device.
*
* @return The maximum height.
*/
protected double estimateMaximumTickLabelHeight(Graphics2D g2) {
RectangleInsets tickLabelInsets = getTickLabelInsets();
double result = tickLabelInsets.getTop() + tickLabelInsets.getBottom();
Font tickLabelFont = getTickLabelFont();
FontRenderContext frc = g2.getFontRenderContext();
result += tickLabelFont.getLineMetrics("123", frc).getHeight();
return result;
}
/**
* Estimates the maximum width of the tick labels, assuming the specified
* tick unit is used.
*
* Rather than computing the string bounds of every tick on the axis, we
* just look at two values: the lower bound and the upper bound for the
* axis. These two values will usually be representative.
*
* @param g2 the graphics device.
* @param unit the tick unit to use for calculation.
*
* @return The estimated maximum width of the tick labels.
*/
protected double estimateMaximumTickLabelWidth(Graphics2D g2,
TickUnit unit) {
RectangleInsets tickLabelInsets = getTickLabelInsets();
double result = tickLabelInsets.getLeft() + tickLabelInsets.getRight();
if (isVerticalTickLabels()) {
// all tick labels have the same width (equal to the height of the
// font)...
FontRenderContext frc = g2.getFontRenderContext();
LineMetrics lm = getTickLabelFont().getLineMetrics("0", frc);
result += lm.getHeight();
}
else {
// look at lower and upper bounds...
FontMetrics fm = g2.getFontMetrics(getTickLabelFont());
Range range = getRange();
double lower = range.getLowerBound();
double upper = range.getUpperBound();
String lowerStr, upperStr;
NumberFormat formatter = getNumberFormatOverride();
if (formatter != null) {
lowerStr = formatter.format(lower);
upperStr = formatter.format(upper);
}
else {
lowerStr = unit.valueToString(lower);
upperStr = unit.valueToString(upper);
}
double w1 = fm.stringWidth(lowerStr);
double w2 = fm.stringWidth(upperStr);
result += Math.max(w1, w2);
}
return result;
}
/**
* Selects an appropriate tick value for the axis. The strategy is to
* display as many ticks as possible (selected from an array of 'standard'
* tick units) without the labels overlapping.
*
* @param g2 the graphics device.
* @param dataArea the area defined by the axes.
* @param edge the axis location.
*/
protected void selectAutoTickUnit(Graphics2D g2, Rectangle2D dataArea,
RectangleEdge edge) {
if (RectangleEdge.isTopOrBottom(edge)) {
selectHorizontalAutoTickUnit(g2, dataArea, edge);
}
else if (RectangleEdge.isLeftOrRight(edge)) {
selectVerticalAutoTickUnit(g2, dataArea, edge);
}
}
/**
* Selects an appropriate tick value for the axis. The strategy is to
* display as many ticks as possible (selected from an array of 'standard'
* tick units) without the labels overlapping.
*
* @param g2 the graphics device.
* @param dataArea the area defined by the axes.
* @param edge the axis location.
*/
protected void selectHorizontalAutoTickUnit(Graphics2D g2,
Rectangle2D dataArea, RectangleEdge edge) {
TickUnit unit = getTickUnit();
TickUnitSource tickUnitSource = getStandardTickUnits();
// we should start with the current tick unit if it gives a count in
// the range 3 to 40 otherwise estimate one that will give a count <= 10
double length = getRange().getLength();
int count = (int) (length / unit.getSize());
if (count < 3 || count > 40) {
unit = tickUnitSource.getCeilingTickUnit(length / 10);
}
// now consider the label size relative to the width of the tick unit
// and make a guess at the ideal size
TickUnit unit1 = tickUnitSource.getCeilingTickUnit(unit);
double tickLabelWidth = estimateMaximumTickLabelWidth(g2, unit1);
double unit1Width = lengthToJava2D(unit1.getSize(), dataArea, edge);
NumberTickUnit unit2 = (NumberTickUnit) unit1;
double guess = (tickLabelWidth / unit1Width) * unit1.getSize();
// due to limitations of double precision, when you zoom very far into
// a chart, eventually the visible axis range will get reported as
// having length 0, and then 'guess' above will be infinite ... in that
// case we'll just stick with the tick unit we have, it's better than
// throwing an exception
// https://github.com/jfree/jfreechart/issues/64
if (Double.isFinite(guess)) {
unit2 = (NumberTickUnit) tickUnitSource.getCeilingTickUnit(guess);
double unit2Width = lengthToJava2D(unit2.getSize(), dataArea, edge);
tickLabelWidth = estimateMaximumTickLabelWidth(g2, unit2);
if (tickLabelWidth > unit2Width) {
unit2 = (NumberTickUnit) tickUnitSource.getLargerTickUnit(unit2);
}
}
setTickUnit(unit2, false, false);
}
/**
* Selects an appropriate tick value for the axis. The strategy is to
* display as many ticks as possible (selected from an array of 'standard'
* tick units) without the labels overlapping.
*
* @param g2 the graphics device.
* @param dataArea the area in which the plot should be drawn.
* @param edge the axis location.
*/
protected void selectVerticalAutoTickUnit(Graphics2D g2,
Rectangle2D dataArea, RectangleEdge edge) {
double tickLabelHeight = estimateMaximumTickLabelHeight(g2);
// start with the current tick unit...
TickUnitSource tickUnits = getStandardTickUnits();
TickUnit unit1 = tickUnits.getCeilingTickUnit(getTickUnit());
double unitHeight = lengthToJava2D(unit1.getSize(), dataArea, edge);
double guess;
if (unitHeight > 0) { // then extrapolate...
guess = (tickLabelHeight / unitHeight) * unit1.getSize();
} else {
guess = getRange().getLength() / 20.0;
}
NumberTickUnit unit2 = (NumberTickUnit) tickUnits.getCeilingTickUnit(
guess);
double unit2Height = lengthToJava2D(unit2.getSize(), dataArea, edge);
tickLabelHeight = estimateMaximumTickLabelHeight(g2);
if (tickLabelHeight > unit2Height) {
unit2 = (NumberTickUnit) tickUnits.getLargerTickUnit(unit2);
}
setTickUnit(unit2, false, false);
}
/**
* Calculates the positions of the tick labels for the axis, storing the
* results in the tick label list (ready for drawing).
*
* @param g2 the graphics device.
* @param state the axis state.
* @param dataArea the area in which the plot should be drawn.
* @param edge the location of the axis.
*
* @return A list of ticks.
*/
@Override
public List refreshTicks(Graphics2D g2, AxisState state,
Rectangle2D dataArea, RectangleEdge edge) {
List result = new java.util.ArrayList();
if (RectangleEdge.isTopOrBottom(edge)) {
result = refreshTicksHorizontal(g2, dataArea, edge);
}
else if (RectangleEdge.isLeftOrRight(edge)) {
result = refreshTicksVertical(g2, dataArea, edge);
}
return result;
}
/**
* Calculates the positions of the tick labels for the axis, storing the
* results in the tick label list (ready for drawing).
*
* @param g2 the graphics device.
* @param dataArea the area in which the data should be drawn.
* @param edge the location of the axis.
*
* @return A list of ticks.
*/
protected List refreshTicksHorizontal(Graphics2D g2,
Rectangle2D dataArea, RectangleEdge edge) {
List result = new java.util.ArrayList();
Font tickLabelFont = getTickLabelFont();
g2.setFont(tickLabelFont);
if (isAutoTickUnitSelection()) {
selectAutoTickUnit(g2, dataArea, edge);
}
TickUnit tu = getTickUnit();
double size = tu.getSize();
int count = calculateVisibleTickCount();
double lowestTickValue = calculateLowestVisibleTickValue();
if (count <= ValueAxis.MAXIMUM_TICK_COUNT) {
int minorTickSpaces = getMinorTickCount();
if (minorTickSpaces <= 0) {
minorTickSpaces = tu.getMinorTickCount();
}
for (int minorTick = 1; minorTick < minorTickSpaces; minorTick++) {
double minorTickValue = lowestTickValue
- size * minorTick / minorTickSpaces;
if (getRange().contains(minorTickValue)) {
result.add(new NumberTick(TickType.MINOR, minorTickValue,
"", TextAnchor.TOP_CENTER, TextAnchor.CENTER,
0.0));
}
}
for (int i = 0; i < count; i++) {
double currentTickValue = lowestTickValue + (i * size);
String tickLabel;
NumberFormat formatter = getNumberFormatOverride();
if (formatter != null) {
tickLabel = formatter.format(currentTickValue);
}
else {
tickLabel = getTickUnit().valueToString(currentTickValue);
}
TextAnchor anchor, rotationAnchor;
double angle = 0.0;
if (isVerticalTickLabels()) {
anchor = TextAnchor.CENTER_RIGHT;
rotationAnchor = TextAnchor.CENTER_RIGHT;
if (edge == RectangleEdge.TOP) {
angle = Math.PI / 2.0;
}
else {
angle = -Math.PI / 2.0;
}
}
else {
if (edge == RectangleEdge.TOP) {
anchor = TextAnchor.BOTTOM_CENTER;
rotationAnchor = TextAnchor.BOTTOM_CENTER;
}
else {
anchor = TextAnchor.TOP_CENTER;
rotationAnchor = TextAnchor.TOP_CENTER;
}
}
Tick tick = new NumberTick(currentTickValue, tickLabel, anchor,
rotationAnchor, angle);
result.add(tick);
double nextTickValue = lowestTickValue + ((i + 1) * size);
for (int minorTick = 1; minorTick < minorTickSpaces;
minorTick++) {
double minorTickValue = currentTickValue
+ (nextTickValue - currentTickValue)
* minorTick / minorTickSpaces;
if (getRange().contains(minorTickValue)) {
result.add(new NumberTick(TickType.MINOR,
minorTickValue, "", TextAnchor.TOP_CENTER,
TextAnchor.CENTER, 0.0));
}
}
}
}
return result;
}
/**
* Calculates the positions of the tick labels for the axis, storing the
* results in the tick label list (ready for drawing).
*
* @param g2 the graphics device.
* @param dataArea the area in which the plot should be drawn.
* @param edge the location of the axis.
*
* @return A list of ticks.
*/
protected List refreshTicksVertical(Graphics2D g2,
Rectangle2D dataArea, RectangleEdge edge) {
List result = new ArrayList<>();
Font tickLabelFont = getTickLabelFont();
g2.setFont(tickLabelFont);
if (isAutoTickUnitSelection()) {
selectAutoTickUnit(g2, dataArea, edge);
}
TickUnit tu = getTickUnit();
double size = tu.getSize();
int count = calculateVisibleTickCount();
double lowestTickValue = calculateLowestVisibleTickValue();
if (count <= ValueAxis.MAXIMUM_TICK_COUNT) {
int minorTickSpaces = getMinorTickCount();
if (minorTickSpaces <= 0) {
minorTickSpaces = tu.getMinorTickCount();
}
for (int minorTick = 1; minorTick < minorTickSpaces; minorTick++) {
double minorTickValue = lowestTickValue
- size * minorTick / minorTickSpaces;
if (getRange().contains(minorTickValue)) {
result.add(new NumberTick(TickType.MINOR, minorTickValue,
"", TextAnchor.TOP_CENTER, TextAnchor.CENTER,
0.0));
}
}
for (int i = 0; i < count; i++) {
double currentTickValue = lowestTickValue + (i * size);
String tickLabel;
NumberFormat formatter = getNumberFormatOverride();
if (formatter != null) {
tickLabel = formatter.format(currentTickValue);
}
else {
tickLabel = getTickUnit().valueToString(currentTickValue);
}
TextAnchor anchor;
TextAnchor rotationAnchor;
double angle = 0.0;
if (isVerticalTickLabels()) {
if (edge == RectangleEdge.LEFT) {
anchor = TextAnchor.BOTTOM_CENTER;
rotationAnchor = TextAnchor.BOTTOM_CENTER;
angle = -Math.PI / 2.0;
}
else {
anchor = TextAnchor.BOTTOM_CENTER;
rotationAnchor = TextAnchor.BOTTOM_CENTER;
angle = Math.PI / 2.0;
}
}
else {
if (edge == RectangleEdge.LEFT) {
anchor = TextAnchor.CENTER_RIGHT;
rotationAnchor = TextAnchor.CENTER_RIGHT;
}
else {
anchor = TextAnchor.CENTER_LEFT;
rotationAnchor = TextAnchor.CENTER_LEFT;
}
}
Tick tick = new NumberTick(currentTickValue, tickLabel, anchor,
rotationAnchor, angle);
result.add(tick);
double nextTickValue = lowestTickValue + ((i + 1) * size);
for (int minorTick = 1; minorTick < minorTickSpaces;
minorTick++) {
double minorTickValue = currentTickValue
+ (nextTickValue - currentTickValue)
* minorTick / minorTickSpaces;
if (getRange().contains(minorTickValue)) {
result.add(new NumberTick(TickType.MINOR,
minorTickValue, "", TextAnchor.TOP_CENTER,
TextAnchor.CENTER, 0.0));
}
}
}
}
return result;
}
/**
* Returns a clone of the axis.
*
* @return A clone
*
* @throws CloneNotSupportedException if some component of the axis does
* not support cloning.
*/
@Override
public Object clone() throws CloneNotSupportedException {
NumberAxis clone = (NumberAxis) super.clone();
if (this.numberFormatOverride != null) {
clone.numberFormatOverride
= (NumberFormat) this.numberFormatOverride.clone();
}
return clone;
}
/**
* Tests the axis for equality with an arbitrary object.
*
* @param obj the object ({@code null} permitted).
*
* @return A boolean.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof NumberAxis)) {
return false;
}
NumberAxis that = (NumberAxis) obj;
if (this.autoRangeIncludesZero != that.autoRangeIncludesZero) {
return false;
}
if (this.autoRangeStickyZero != that.autoRangeStickyZero) {
return false;
}
if (!Objects.equals(this.tickUnit, that.tickUnit)) {
return false;
}
if (!Objects.equals(this.numberFormatOverride,
that.numberFormatOverride)) {
return false;
}
if (!this.rangeType.equals(that.rangeType)) {
return false;
}
return super.equals(obj);
}
/**
* Returns a hash code for this object.
*
* @return A hash code.
*/
@Override
public int hashCode() {
return super.hashCode();
}
}