Package org.jfree.chart.axis

Class LogarithmicAxis

java.lang.Object

org.jfree.chart.axis.Axis

org.jfree.chart.axis.ValueAxis

org.jfree.chart.axis.NumberAxis

org.jfree.chart.axis.LogarithmicAxis

All Implemented Interfaces:

Serializable, Cloneable, PublicCloneable

public class LogarithmicAxis
extends NumberAxis

A numerical axis that uses a logarithmic scale.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	allowNegativesFlag	Flag set true to allow negative values in data.
protected boolean	autoRangeNextLogFlag	True to make 'autoAdjustRange()' select "10^n" values.
protected boolean	expTickLabelsFlag	Flag set true for "1e#"-style tick labels.
static final double	LOG10_VALUE	Useful constant for log(10).
protected boolean	log10TickLabelsFlag	Flag set true for "10^n"-style tick labels.
protected final NumberFormat	numberFormatterObj	Number formatter for generating numeric strings.
static final double	SMALL_LOG_VALUE	Smallest arbitrarily-close-to-zero value allowed.
protected boolean	smallLogFlag	Helper flag for log axis processing.
protected boolean	strictValuesFlag	Flag set true make axis throw exception if any values are <= 0 and 'allowNegativesFlag' is false.

Fields inherited from class org.jfree.chart.axis.NumberAxis

DEFAULT_AUTO_RANGE_INCLUDES_ZERO, DEFAULT_AUTO_RANGE_STICKY_ZERO, DEFAULT_TICK_UNIT, DEFAULT_VERTICAL_TICK_LABELS

Fields inherited from class org.jfree.chart.axis.ValueAxis

DEFAULT_AUTO_RANGE, DEFAULT_AUTO_RANGE_MINIMUM_SIZE, DEFAULT_AUTO_TICK_UNIT_SELECTION, DEFAULT_INVERTED, DEFAULT_LOWER_MARGIN, DEFAULT_RANGE, DEFAULT_UPPER_MARGIN, MAXIMUM_TICK_COUNT

Fields inherited from class org.jfree.chart.axis.Axis

DEFAULT_AXIS_LABEL_FONT, DEFAULT_AXIS_LABEL_INSETS, DEFAULT_AXIS_LABEL_PAINT, DEFAULT_AXIS_LINE_PAINT, DEFAULT_AXIS_LINE_STROKE, DEFAULT_AXIS_VISIBLE, DEFAULT_TICK_LABEL_FONT, DEFAULT_TICK_LABEL_INSETS, DEFAULT_TICK_LABEL_PAINT, DEFAULT_TICK_LABELS_VISIBLE, DEFAULT_TICK_MARK_INSIDE_LENGTH, DEFAULT_TICK_MARK_OUTSIDE_LENGTH, DEFAULT_TICK_MARK_PAINT, DEFAULT_TICK_MARK_STROKE, DEFAULT_TICK_MARKS_VISIBLE

Constructor Summary

Constructors

Constructor	Description
LogarithmicAxis(String label)	Creates a new axis.

Method Summary

Modifier and Type	Method	Description
double	adjustedLog10(double val)	Returns an adjusted log10 value for graphing purposes.
double	adjustedPow10(double val)	Returns an adjusted power of 10 value for graphing purposes.
void	autoAdjustRange()	Rescales the axis to ensure that all data is visible.
protected double	computeLogCeil(double upper)	Returns the smallest (closest to negative infinity) double value that is not less than the argument, is equal to a mathematical integer and satisfying the condition that log base 10 of the value is an integer (i.e., the value returned will be a power of 10: 1, 10, 100, 1000, etc.).
protected double	computeLogFloor(double lower)	Returns the largest (closest to positive infinity) double value that is not greater than the argument, is equal to a mathematical integer and satisfying the condition that log base 10 of the value is an integer (i.e., the value returned will be a power of 10: 1, 10, 100, 1000, etc.).
boolean	getAllowNegativesFlag()	Returns the 'allowNegativesFlag' flag; true to allow negative values in data, false to be able to plot positive values arbitrarily close to zero.
boolean	getAutoRangeNextLogFlag()	Returns the 'autoRangeNextLogFlag' flag.
boolean	getExpTickLabelsFlag()	Returns the 'expTickLabelsFlag' flag.
boolean	getLog10TickLabelsFlag()	Returns the 'log10TickLabelsFlag' flag.
boolean	getStrictValuesFlag()	Returns the 'strictValuesFlag' flag; if true and 'allowNegativesFlag' is false then this axis will throw a runtime exception if any of its values are less than or equal to zero; if false then the axis will adjust for values less than or equal to zero as needed.
double	java2DToValue(double java2DValue, Rectangle2D plotArea, RectangleEdge edge)	Converts a coordinate in Java2D space to the corresponding data value, assuming that the axis runs along one edge of the specified plotArea.
protected String	makeTickLabel(double val)	Converts the given value to a tick label string.
protected String	makeTickLabel(double val, boolean forceFmtFlag)	Converts the given value to a tick label string.
protected List	refreshTicksHorizontal(Graphics2D g2, Rectangle2D dataArea, RectangleEdge edge)	Calculates the positions of the tick labels for the axis, storing the results in the tick label list (ready for drawing).
protected List	refreshTicksVertical(Graphics2D g2, Rectangle2D dataArea, RectangleEdge edge)	Calculates the positions of the tick labels for the axis, storing the results in the tick label list (ready for drawing).
void	setAllowNegativesFlag(boolean flgVal)	Sets the 'allowNegativesFlag' flag; true to allow negative values in data, false to be able to plot positive values arbitrarily close to zero.
void	setAutoRangeNextLogFlag(boolean flag)	Sets the 'autoRangeNextLogFlag' flag.
void	setExpTickLabelsFlag(boolean flgVal)	Sets the 'expTickLabelsFlag' flag.
void	setLog10TickLabelsFlag(boolean flag)	Sets the 'log10TickLabelsFlag' flag.
void	setRange(Range range)	Overridden version that calls original and then sets up flag for log axis processing.
void	setStrictValuesFlag(boolean flgVal)	Sets the 'strictValuesFlag' flag; if true and 'allowNegativesFlag' is false then this axis will throw a runtime exception if any of its values are less than or equal to zero; if false then the axis will adjust for values less than or equal to zero as needed.
protected void	setupNumberFmtObj()	Sets up the number formatter object according to the 'expTickLabelsFlag' flag.
protected void	setupSmallLogFlag()	Sets up flag for log axis processing.
protected double	switchedLog10(double val)	Returns the log10 value, depending on if values between 0 and 1 are being plotted.
double	switchedPow10(double val)	Returns a power of 10, depending on if values between 0 and 1 are being plotted.
double	valueToJava2D(double value, Rectangle2D plotArea, RectangleEdge edge)	Converts a data value to a coordinate in Java2D space, assuming that the axis runs along one edge of the specified plotArea.
void	zoomRange(double lowerPercent, double upperPercent)	Zooms in on the current range.

Methods inherited from class org.jfree.chart.axis.NumberAxis

calculateHighestVisibleTickValue, calculateLowestVisibleTickValue, calculateVisibleTickCount, clone, configure, createIntegerTickUnits, createIntegerTickUnits, createStandardTickUnits, createStandardTickUnits, draw, equals, estimateMaximumTickLabelHeight, estimateMaximumTickLabelWidth, getAutoRangeIncludesZero, getAutoRangeStickyZero, getMarkerBand, getNumberFormatOverride, getRangeType, getTickUnit, hashCode, refreshTicks, selectAutoTickUnit, selectHorizontalAutoTickUnit, selectVerticalAutoTickUnit, setAutoRangeIncludesZero, setAutoRangeStickyZero, setMarkerBand, setNumberFormatOverride, setRangeType, setTickUnit, setTickUnit

Methods inherited from class org.jfree.chart.axis.ValueAxis

calculateAnchorPoint, centerRange, drawAxisLine, drawTickMarksAndLabels, findMaximumTickLabelHeight, findMaximumTickLabelWidth, getAutoRangeMinimumSize, getAutoTickIndex, getDefaultAutoRange, getDownArrow, getFixedAutoRange, getLeftArrow, getLowerBound, getLowerMargin, getMinorTickCount, getRange, getRightArrow, getStandardTickUnits, getUpArrow, getUpperBound, getUpperMargin, isAutoRange, isAutoTickUnitSelection, isInverted, isNegativeArrowVisible, isPositiveArrowVisible, isVerticalTickLabels, lengthToJava2D, pan, reserveSpace, resizeRange, resizeRange, resizeRange2, setAutoRange, setAutoRange, setAutoRangeMinimumSize, setAutoRangeMinimumSize, setAutoTickIndex, setAutoTickUnitSelection, setAutoTickUnitSelection, setDefaultAutoRange, setDownArrow, setFixedAutoRange, setInverted, setLeftArrow, setLowerBound, setLowerMargin, setMinorTickCount, setNegativeArrowVisible, setPositiveArrowVisible, setRange, setRange, setRangeAboutValue, setRangeWithMargins, setRangeWithMargins, setRangeWithMargins, setRightArrow, setStandardTickUnits, setUpArrow, setUpperBound, setUpperMargin, setVerticalTickLabels

Methods inherited from class org.jfree.chart.axis.Axis

addChangeListener, createAndAddEntity, createAttributedLabel, drawAttributedLabel, drawLabel, fireChangeEvent, getAttributedLabel, getAxisLinePaint, getAxisLineStroke, getFixedDimension, getLabel, getLabelAngle, getLabelEnclosure, getLabelFont, getLabelInsets, getLabelLocation, getLabelPaint, getMinorTickMarkInsideLength, getMinorTickMarkOutsideLength, getPlot, getTickLabelFont, getTickLabelInsets, getTickLabelPaint, getTickMarkInsideLength, getTickMarkOutsideLength, getTickMarkPaint, getTickMarkStroke, hasListener, isAxisLineVisible, isMinorTickMarksVisible, isTickLabelsVisible, isTickMarksVisible, isVisible, labelAnchorH, labelAnchorV, labelLocationX, labelLocationY, notifyListeners, removeChangeListener, setAttributedLabel, setAttributedLabel, setAxisLinePaint, setAxisLineStroke, setAxisLineVisible, setFixedDimension, setLabel, setLabelAngle, setLabelFont, setLabelInsets, setLabelInsets, setLabelLocation, setLabelPaint, setMinorTickMarkInsideLength, setMinorTickMarkOutsideLength, setMinorTickMarksVisible, setPlot, setTickLabelFont, setTickLabelInsets, setTickLabelPaint, setTickLabelsVisible, setTickMarkInsideLength, setTickMarkOutsideLength, setTickMarkPaint, setTickMarkStroke, setTickMarksVisible, setVisible

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Details

LOG10_VALUE

public static final double LOG10_VALUE

Useful constant for log(10).

SMALL_LOG_VALUE

public static final double SMALL_LOG_VALUE

Smallest arbitrarily-close-to-zero value allowed.

See Also:

• Constant Field Values

allowNegativesFlag

protected boolean allowNegativesFlag

Flag set true to allow negative values in data.

strictValuesFlag

protected boolean strictValuesFlag

Flag set true make axis throw exception if any values are <= 0 and 'allowNegativesFlag' is false.

numberFormatterObj

protected final NumberFormat numberFormatterObj

Number formatter for generating numeric strings.

expTickLabelsFlag

protected boolean expTickLabelsFlag

Flag set true for "1e#"-style tick labels.

log10TickLabelsFlag

protected boolean log10TickLabelsFlag

Flag set true for "10^n"-style tick labels.

autoRangeNextLogFlag

protected boolean autoRangeNextLogFlag

True to make 'autoAdjustRange()' select "10^n" values.

smallLogFlag

protected boolean smallLogFlag

Helper flag for log axis processing.

Constructor Details

LogarithmicAxis

public LogarithmicAxis(String label)

Creates a new axis.

Parameters:

label - the axis label.

Method Details

setAllowNegativesFlag

public void setAllowNegativesFlag(boolean flgVal)

Sets the 'allowNegativesFlag' flag; true to allow negative values in data, false to be able to plot positive values arbitrarily close to zero.

Parameters:

flgVal - the new value of the flag.

getAllowNegativesFlag

public boolean getAllowNegativesFlag()

Returns the 'allowNegativesFlag' flag; true to allow negative values in data, false to be able to plot positive values arbitrarily close to zero.

Returns:

The flag.

setStrictValuesFlag

public void setStrictValuesFlag(boolean flgVal)

Sets the 'strictValuesFlag' flag; if true and 'allowNegativesFlag' is false then this axis will throw a runtime exception if any of its values are less than or equal to zero; if false then the axis will adjust for values less than or equal to zero as needed.

Parameters:

flgVal - true for strict enforcement.

getStrictValuesFlag

public boolean getStrictValuesFlag()

Returns the 'strictValuesFlag' flag; if true and 'allowNegativesFlag' is false then this axis will throw a runtime exception if any of its values are less than or equal to zero; if false then the axis will adjust for values less than or equal to zero as needed.

Returns:

true if strict enforcement is enabled.

setExpTickLabelsFlag

public void setExpTickLabelsFlag(boolean flgVal)

Sets the 'expTickLabelsFlag' flag. If the 'log10TickLabelsFlag' is false then this will set whether or not "1e#"-style tick labels are used. The default is to use regular numeric tick labels.

Parameters:

flgVal - true for "1e#"-style tick labels, false for log10 or regular numeric tick labels.

getExpTickLabelsFlag

public boolean getExpTickLabelsFlag()

Returns the 'expTickLabelsFlag' flag.

Returns:

true for "1e#"-style tick labels, false for log10 or regular numeric tick labels.

setLog10TickLabelsFlag

public void setLog10TickLabelsFlag(boolean flag)

Sets the 'log10TickLabelsFlag' flag. The default value is false.

Parameters:

flag - true for "10^n"-style tick labels, false for "1e#"-style or regular numeric tick labels.

getLog10TickLabelsFlag

public boolean getLog10TickLabelsFlag()

Returns the 'log10TickLabelsFlag' flag.

Returns:

true for "10^n"-style tick labels, false for "1e#"-style or regular numeric tick labels.

setAutoRangeNextLogFlag

public void setAutoRangeNextLogFlag(boolean flag)

Sets the 'autoRangeNextLogFlag' flag. This determines whether or not the 'autoAdjustRange()' method will select the next "10^n" values when determining the upper and lower bounds. The default value is false.

Parameters:

flag - true to make the 'autoAdjustRange()' method select the next "10^n" values, false to not.

getAutoRangeNextLogFlag

public boolean getAutoRangeNextLogFlag()

Returns the 'autoRangeNextLogFlag' flag.

Returns:

true if the 'autoAdjustRange()' method will select the next "10^n" values, false if not.

setRange

public void setRange(Range range)

Overridden version that calls original and then sets up flag for log axis processing.

Overrides:

setRange in class ValueAxis

Parameters:

range - the new range.

See Also:

• ValueAxis.getRange()

setupSmallLogFlag

protected void setupSmallLogFlag()

Sets up flag for log axis processing. Set true if negative values not allowed and the lower bound is between 0 and 10.

setupNumberFmtObj

protected void setupNumberFmtObj()

Sets up the number formatter object according to the 'expTickLabelsFlag' flag.

switchedLog10

protected double switchedLog10(double val)

Returns the log10 value, depending on if values between 0 and 1 are being plotted. If negative values are not allowed and the lower bound is between 0 and 10 then a normal log is returned; otherwise the returned value is adjusted if the given value is less than 10.

Parameters:

val - the value.

Returns:

log₁₀(val).

See Also:

• switchedPow10(double)

switchedPow10

public double switchedPow10(double val)

Returns a power of 10, depending on if values between 0 and 1 are being plotted. If negative values are not allowed and the lower bound is between 0 and 10 then a normal power is returned; otherwise the returned value is adjusted if the given value is less than 1.

Parameters:

val - the value.

Returns:

10^val.

See Also:

• switchedLog10(double)

adjustedLog10

public double adjustedLog10(double val)

Returns an adjusted log10 value for graphing purposes. The first adjustment is that negative values are changed to positive during the calculations, and then the answer is negated at the end. The second is that, for values less than 10, an increasingly large (0 to 1) scaling factor is added such that at 0 the value is adjusted to 1, resulting in a returned result of 0.

Parameters:

val - value for which log10 should be calculated.

Returns:

An adjusted log₁₀(val).

See Also:

• adjustedPow10(double)

adjustedPow10

public double adjustedPow10(double val)

Returns an adjusted power of 10 value for graphing purposes. The first adjustment is that negative values are changed to positive during the calculations, and then the answer is negated at the end. The second is that, for values less than 1, a progressive logarithmic offset is subtracted such that at 0 the returned result is also 0.

Parameters:

val - value for which power of 10 should be calculated.

Returns:

An adjusted 10^val.

See Also:

• adjustedLog10(double)

computeLogFloor

protected double computeLogFloor(double lower)

Returns the largest (closest to positive infinity) double value that is not greater than the argument, is equal to a mathematical integer and satisfying the condition that log base 10 of the value is an integer (i.e., the value returned will be a power of 10: 1, 10, 100, 1000, etc.).

Parameters:

lower - a double value below which a floor will be calcualted.

Returns:

10^N with N .. { 1 ... }

computeLogCeil

protected double computeLogCeil(double upper)

Returns the smallest (closest to negative infinity) double value that is not less than the argument, is equal to a mathematical integer and satisfying the condition that log base 10 of the value is an integer (i.e., the value returned will be a power of 10: 1, 10, 100, 1000, etc.).

Parameters:

upper - a double value above which a ceiling will be calcualted.

Returns:

10^N with N .. { 1 ... }

autoAdjustRange

public void autoAdjustRange()

Rescales the axis to ensure that all data is visible.

Overrides:

autoAdjustRange in class NumberAxis

valueToJava2D

public double valueToJava2D(double value,
 Rectangle2D plotArea,
 RectangleEdge edge)

Converts a data value to a coordinate in Java2D space, assuming that the axis runs along one edge of the specified plotArea. Note that it is possible for the coordinate to fall outside the plotArea.

Overrides:

valueToJava2D in class NumberAxis

Parameters:

value - the data value.

plotArea - the area for plotting the data.

edge - the axis location.

Returns:

The Java2D coordinate.

See Also:

• NumberAxis.java2DToValue(double, Rectangle2D, RectangleEdge)

java2DToValue

public double java2DToValue(double java2DValue,
 Rectangle2D plotArea,
 RectangleEdge edge)

Converts a coordinate in Java2D space to the corresponding data value, assuming that the axis runs along one edge of the specified plotArea.

Overrides:

java2DToValue in class NumberAxis

Parameters:

java2DValue - the coordinate in Java2D space.

plotArea - the area in which the data is plotted.

edge - the axis location.

Returns:

The data value.

See Also:

• NumberAxis.valueToJava2D(double, Rectangle2D, RectangleEdge)

zoomRange

public void zoomRange(double lowerPercent,
 double upperPercent)

Zooms in on the current range.

Overrides:

zoomRange in class ValueAxis

Parameters:

lowerPercent - the new lower bound.

upperPercent - the new upper bound.

refreshTicksHorizontal

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

Calculates the positions of the tick labels for the axis, storing the results in the tick label list (ready for drawing).

Overrides:

refreshTicksHorizontal in class NumberAxis

Parameters:

g2 - the graphics device.

dataArea - the area in which the plot should be drawn.

edge - the location of the axis.

Returns:

A list of ticks.

refreshTicksVertical

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

Calculates the positions of the tick labels for the axis, storing the results in the tick label list (ready for drawing).

Overrides:

refreshTicksVertical in class NumberAxis

Parameters:

g2 - the graphics device.

dataArea - the area in which the plot should be drawn.

edge - the location of the axis.

Returns:

A list of ticks.

makeTickLabel

protected String makeTickLabel(double val,
 boolean forceFmtFlag)

Converts the given value to a tick label string.

Parameters:

val - the value to convert.

forceFmtFlag - true to force the number-formatter object to be used.

Returns:

The tick label string.

makeTickLabel

protected String makeTickLabel(double val)

Converts the given value to a tick label string.

Parameters:

val - the value to convert.

Returns:

The tick label string.