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   * v 1.0 as shown at http://oss.oracle.com/licenses/upl
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   * and the following disclaimer.
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  package org.openjdk.jmc.ui.charts;
  
  import org.openjdk.jmc.common.IDisplayable;
  
  /**
   * Interface for an indexable set of coordinate pairs, ordered on the x coordinate, where each
   * coordinate also has an {@link IDisplayable}. In addition, a user payload is carried along.
   *
   * @param <P>
   * @param <D>
   */
  public interface IXYDisplayableSet<P, D extends IDisplayable> {
  
  	/**
  	 * @return the size of the set, that is, the number of coordinate pairs
  	 */
  	int getSize();
  
  	/**
  	 * @param index
  	 *            the coordinate index
  	 * @return
  	 */
  	double getPixelX(int index);
  
  	/**
  	 * @param index
  	 *            the coordinate index
  	 * @return
  	 */
  	double getPixelY(int index);
  
  	/**
  	 * @param index
  	 *            the coordinate index
  	 * @return
  	 */
  	D getDisplayableX(int index);
  
  	/**
  	 * @param index
  	 *            the coordinate index
  	 * @return
  	 */
  	D getDisplayableY(int index);
  
  	/**
  	 * @return the width in integer pixels
  	 */
  	int getWidth();
  
  	/**
  	 * @return the height in integer pixels
  	 */
  	int getHeight();
  
  	/**
  	 * The payload. If this is an array, it may be assumed to be of length {@link #getSize()}.
  	 *
  	 * @return
  	 */
  	P getPayload();
  }
  