/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2011, by Object Refinery Limited 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.]
*
* --------------
* DialLayer.java
* --------------
* (C) Copyright 2006-2008, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes
* -------
* 03-Nov-2006 : Version 1 (DG);
*
*/
package org.jfree.chart.plot.dial;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import java.util.EventListener;
/**
* 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.
* <br><br>
* Classes that implement this interface should be {@link Serializable},
* otherwise chart serialization may fail.
*
* @since 1.0.7
*/
public interface DialLayer {
/**
* Returns a flag that indicates whether or not the layer is visible.
*
* @return A boolean.
*/
public boolean isVisible();
/**
* Registers a listener with this layer, so that it receives notification
* of changes to this layer.
*
* @param listener the listener.
*/
public void addChangeListener(DialLayerChangeListener listener);
/**
* Deregisters a listener, so that it no longer receives notification of
* changes to this layer.
*
* @param listener the listener.
*/
public void removeChangeListener(DialLayerChangeListener listener);
/**
* Returns <code>true</code> if the specified listener is currently
* registered with the this layer.
*
* @param listener the listener.
*
* @return A boolean.
*/
public boolean hasListener(EventListener listener);
/**
* Returns <code>true</code> if the drawing should be clipped to the
* dial window (which is defined by the {@link DialFrame}), and
* <code>false</code> otherwise.
*
* @return A boolean.
*/
public boolean isClippedToWindow();
/**
* Draws the content of this layer.
*
* @param g2 the graphics target (<code>null</code> not permitted).
* @param plot the plot (typically this should not be <code>null</code>,
* but for a layer that doesn't need to reference the plot, it may
* be permitted).
* @param frame the reference frame for the dial's geometry
* (<code>null</code> not permitted). This is typically larger than
* the visible area of the dial (see the next parameter).
* @param view the visible area for the dial (<code>null</code> not
* permitted).
*/
public void draw(Graphics2D g2, DialPlot plot, Rectangle2D frame,
Rectangle2D view);
}
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