Package org.jfree.chart.panel

Class CrosshairOverlay

java.lang.Object

org.jfree.chart.panel.AbstractOverlay

org.jfree.chart.panel.CrosshairOverlay

All Implemented Interfaces:

PropertyChangeListener, Serializable, Cloneable, EventListener, Overlay, PublicCloneable

public class CrosshairOverlay
extends AbstractOverlay
implements Overlay, PropertyChangeListener, PublicCloneable, Cloneable, Serializable

An overlay for a ChartPanel that draws crosshairs on a chart. If you are using the JavaFX extensions for JFreeChart, then you should use the CrosshairOverlayFX class.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
CrosshairOverlay()	Creates a new overlay that initially contains no crosshairs.

Method Summary

Modifier and Type	Method	Description
void	addDomainCrosshair(Crosshair crosshair)	Adds a crosshair against the domain axis (x-axis) and sends an OverlayChangeEvent to all registered listeners.
void	addRangeCrosshair(Crosshair crosshair)	Adds a crosshair against the range axis and sends an OverlayChangeEvent to all registered listeners.
void	clearDomainCrosshairs()	Clears all the domain crosshairs from the overlay and sends an OverlayChangeEvent to all registered listeners (unless there were no crosshairs to begin with).
void	clearRangeCrosshairs()	Clears all the range crosshairs from the overlay and sends an OverlayChangeEvent to all registered listeners (unless there were no crosshairs to begin with).
Object	clone()	Returns a clone of this instance.
protected void	drawHorizontalCrosshair(Graphics2D g2, Rectangle2D dataArea, double y, Crosshair crosshair)	Draws a crosshair horizontally across the plot.
protected void	drawVerticalCrosshair(Graphics2D g2, Rectangle2D dataArea, double x, Crosshair crosshair)	Draws a crosshair vertically on the plot.
boolean	equals(Object obj)	Tests this overlay for equality with an arbitrary object.
List<Crosshair>	getDomainCrosshairs()	Returns a new list containing the domain crosshairs for this overlay.
List<Crosshair>	getRangeCrosshairs()	Returns a new list containing the range crosshairs for this overlay.
void	paintOverlay(Graphics2D g2, ChartPanel chartPanel)	Renders the crosshairs in the overlay on top of the chart that has just been rendered in the specified chartPanel.
void	propertyChange(PropertyChangeEvent e)	Receives a property change event (typically a change in one of the crosshairs).
void	removeDomainCrosshair(Crosshair crosshair)	Removes a domain axis crosshair and sends an OverlayChangeEvent to all registered listeners.
void	removeRangeCrosshair(Crosshair crosshair)	Removes a range axis crosshair and sends an OverlayChangeEvent to all registered listeners.

Methods inherited from class org.jfree.chart.panel.AbstractOverlay

addChangeListener, fireOverlayChanged, notifyListeners, removeChangeListener

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.jfree.chart.panel.Overlay

addChangeListener, removeChangeListener

Constructor Details

CrosshairOverlay

public CrosshairOverlay()

Creates a new overlay that initially contains no crosshairs.

Method Details

addDomainCrosshair

public void addDomainCrosshair(Crosshair crosshair)

Adds a crosshair against the domain axis (x-axis) and sends an OverlayChangeEvent to all registered listeners.

Parameters:

crosshair - the crosshair (null not permitted).

See Also:

• removeDomainCrosshair(org.jfree.chart.plot.Crosshair)
• addRangeCrosshair(org.jfree.chart.plot.Crosshair)

removeDomainCrosshair

public void removeDomainCrosshair(Crosshair crosshair)

Removes a domain axis crosshair and sends an OverlayChangeEvent to all registered listeners.

Parameters:

crosshair - the crosshair (null not permitted).

See Also:

• addDomainCrosshair(org.jfree.chart.plot.Crosshair)

clearDomainCrosshairs

public void clearDomainCrosshairs()

Clears all the domain crosshairs from the overlay and sends an OverlayChangeEvent to all registered listeners (unless there were no crosshairs to begin with).

getDomainCrosshairs

public List<Crosshair> getDomainCrosshairs()

Returns a new list containing the domain crosshairs for this overlay.

Returns:

A list of crosshairs.

addRangeCrosshair

public void addRangeCrosshair(Crosshair crosshair)

Adds a crosshair against the range axis and sends an OverlayChangeEvent to all registered listeners.

Parameters:

crosshair - the crosshair (null not permitted).

removeRangeCrosshair

public void removeRangeCrosshair(Crosshair crosshair)

Removes a range axis crosshair and sends an OverlayChangeEvent to all registered listeners.

Parameters:

crosshair - the crosshair (null not permitted).

See Also:

• addRangeCrosshair(org.jfree.chart.plot.Crosshair)

clearRangeCrosshairs

public void clearRangeCrosshairs()

Clears all the range crosshairs from the overlay and sends an OverlayChangeEvent to all registered listeners (unless there were no crosshairs to begin with).

getRangeCrosshairs

public List<Crosshair> getRangeCrosshairs()

Returns a new list containing the range crosshairs for this overlay.

Returns:

A list of crosshairs.

propertyChange

public void propertyChange(PropertyChangeEvent e)

Receives a property change event (typically a change in one of the crosshairs).

Specified by:

propertyChange in interface PropertyChangeListener

Parameters:

e - the event.

paintOverlay

public void paintOverlay(Graphics2D g2,
 ChartPanel chartPanel)

Renders the crosshairs in the overlay on top of the chart that has just been rendered in the specified chartPanel. This method is called by the JFreeChart framework, you won't normally call it from user code.

Specified by:

paintOverlay in interface Overlay

Parameters:

g2 - the graphics target.

chartPanel - the chart panel.

drawHorizontalCrosshair

protected void drawHorizontalCrosshair(Graphics2D g2,
 Rectangle2D dataArea,
 double y,
 Crosshair crosshair)

Draws a crosshair horizontally across the plot.

Parameters:

g2 - the graphics target.

dataArea - the data area.

y - the y-value in Java2D space.

crosshair - the crosshair.

drawVerticalCrosshair

protected void drawVerticalCrosshair(Graphics2D g2,
 Rectangle2D dataArea,
 double x,
 Crosshair crosshair)

Draws a crosshair vertically on the plot.

Parameters:

g2 - the graphics target.

dataArea - the data area.

x - the x-value in Java2D space.

crosshair - the crosshair.

equals

public boolean equals(Object obj)

Tests this overlay for equality with an arbitrary object.

Overrides:

equals in class Object

Parameters:

obj - the object (null permitted).

Returns:

A boolean.

clone

public Object clone()
             throws CloneNotSupportedException

Returns a clone of this instance.

Specified by:

clone in interface PublicCloneable

Overrides:

clone in class Object

Returns:

A clone of this instance.

Throws:

CloneNotSupportedException - if there is some problem with the cloning.