org.jfree.chart.plot.dial

Interface DialLayer

public interface DialLayer

A dial layer draws itself within a reference frame. The view frame is a subset of the reference frame, and defines the area that is actually visible.

Classes that implement this interface should be Serializable, otherwise chart serialization may fail.

Since: 1.0.7

Method Summary
voidaddChangeListener(DialLayerChangeListener listener)
Registers a listener with this layer, so that it receives notification of changes to this layer.
voiddraw(Graphics2D g2, DialPlot plot, Rectangle2D frame, Rectangle2D view)
Draws the content of this layer.
booleanhasListener(EventListener listener)
Returns true if the specified listener is currently registered with the this layer.
booleanisClippedToWindow()
Returns true if the drawing should be clipped to the dial window (which is defined by the DialFrame), and false otherwise.
booleanisVisible()
Returns a flag that indicates whether or not the layer is visible.
voidremoveChangeListener(DialLayerChangeListener listener)
Deregisters a listener, so that it no longer receives notification of changes to this layer.

Method Detail

addChangeListener

public void addChangeListener(DialLayerChangeListener listener)
Registers a listener with this layer, so that it receives notification of changes to this layer.

Parameters: listener the listener.

draw

public void draw(Graphics2D g2, DialPlot plot, Rectangle2D frame, Rectangle2D view)
Draws the content of this layer.

Parameters: g2 the graphics target (null not permitted). plot the plot (typically this should not be null, but for a layer that doesn't need to reference the plot, it may be permitted). frame the reference frame for the dial's geometry (null not permitted). This is typically larger than the visible area of the dial (see the next parameter). view the visible area for the dial (null not permitted).

hasListener

public boolean hasListener(EventListener listener)
Returns true if the specified listener is currently registered with the this layer.

Parameters: listener the listener.

Returns: A boolean.

isClippedToWindow

public boolean isClippedToWindow()
Returns true if the drawing should be clipped to the dial window (which is defined by the DialFrame), and false otherwise.

Returns: A boolean.

isVisible

public boolean isVisible()
Returns a flag that indicates whether or not the layer is visible.

Returns: A boolean.

removeChangeListener

public void removeChangeListener(DialLayerChangeListener listener)
Deregisters a listener, so that it no longer receives notification of changes to this layer.

Parameters: listener the listener.

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