# Header
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## org.jfree.chart.panel
Interface Overlay

All Known Implementing Classes:
  CrosshairOverlay

    public interface Overlay

Defines the interface for an overlay that can be added to a `ChartPanel`.

Since:
  1.0.13

Method Summary
`void` `addChangeListener(OverlayChangeListener listener)` Registers a change listener with the overlay.
`void` `paintOverlay(java.awt.Graphics2D g2, ChartPanel chartPanel)` Paints the crosshairs in the layer.
`void` `removeChangeListener(OverlayChangeListener listener)` Deregisters a listener from the overlay.

Method Detail

### paintOverlay

    void paintOverlay(java.awt.Graphics2D g2,
                      ChartPanel chartPanel)

  Paints the crosshairs in the layer.

  Parameters:
    `g2` - the graphics target.
    `chartPanel` - the chart panel.

### addChangeListener

    void addChangeListener(OverlayChangeListener listener)

  Registers a change listener with the overlay.

  Parameters:
    `listener` - the listener.

### removeChangeListener

    void removeChangeListener(OverlayChangeListener listener)

  Deregisters a listener from the overlay.

  Parameters:
    `listener` - the listener.

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