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The Waikato Environment for Knowledge Analysis (WEKA), a machine learning workbench. This version represents the developer version, the "bleeding edge" of development, you could say. New functionality gets added to this version.

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/*
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program 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 General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see .
 */

/*
 *    OffscreenChartRenderer.java
 *    Copyright (C) 2011-2012 University of Waikato, Hamilton, New Zealand
 *
 */

package weka.gui.beans;

import java.awt.image.BufferedImage;
import java.util.List;

import weka.core.Instances;

/**
 * Interface to something that can render certain types of charts
 * in headless mode.
 * 
 * @author Mark Hall (mhall{[at]}pentaho{[dot]}com)
 * @version $Revision: 8034 $
 */
public interface OffscreenChartRenderer {

  /**
   * The name of this off screen renderer
   * 
   * @return the name of this off screen renderer
   */
  String rendererName();
  
  /**
   * Gets a short list of additional options (if any),
   * suitable for displaying in a tip text, in HTML form
   * 
   * @return additional options description in simple HTML form
   */
  String optionsTipTextHTML();
  
  /**
   * Render an XY line chart
   * 
   * @param width the width of the resulting chart in pixels
   * @param height the height of the resulting chart in pixels
   * @param series a list of Instances - one for each series to be plotted
   * @param xAxis the name of the attribute for the x-axis (all series Instances 
   * are expected to have an attribute of the same type with this name)
   * @param yAxis the name of the attribute for the y-axis (all series Instances 
   * are expected to have an attribute of the same type with this name)
   * @param optionalArgs optional arguments to the renderer (may be null)
   * 
   * @return a BufferedImage containing the chart
   * @throws Exception if there is a problem rendering the chart
   */
  BufferedImage renderXYLineChart(int width, int height, List series, 
      String xAxis, String yAxis, List optionalArgs) throws Exception;
  
  /**
   * Render an XY scatter plot
   * 
   * @param width the width of the resulting chart in pixels
   * @param height the height of the resulting chart in pixels
   * @param series a list of Instances - one for each series to be plotted
   * @param xAxis the name of the attribute for the x-axis (all series Instances 
   * are expected to have an attribute of the same type with this name)
   * @param yAxis the name of the attribute for the y-axis (all series Instances 
   * are expected to have an attribute of the same type with this name)
   * @param optionalArgs optional arguments to the renderer (may be null)
   * 
   * @return a BufferedImage containing the chart
   * @throws Exception if there is a problem rendering the chart
   */
  BufferedImage renderXYScatterPlot(int width, int height, List series, 
      String xAxis, String yAxis, List optionalArgs) throws Exception;
  
  /**
   * Render histogram(s) (numeric attribute) or bar chart(s) (nominal attribute).
   * Some implementations may not be able to render more than one histogram/pie
   * on the same chart - the implementation can either throw an exception or
   * just process the first series in this case. 
   * 
   * @param width the width of the resulting chart in pixels
   * @param height the height of the resulting chart in pixels
   * @param series a list of Instances - one for each series to be plotted
   * @param attToPlot the name of the attribute to plot (the attribute, with the,
   * same type, must be present in each series) 
   * @param optionalArgs optional arguments to the renderer (may be null)
   * 
   * @return a BufferedImage containing the chart
   * @throws Exception if there is a problem rendering the chart
   */
  BufferedImage renderHistogram(int width, int height, List series, 
      String attsToPlot, List optionalArgs)
    throws Exception;
}