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• ErrorBarFactory.java

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jcckit.plot.ErrorBarFactory Maven / Gradle / Ivy

/*
 * Copyright 2003-2004, Franz-Josef Elmer, All rights reserved
 *
 * 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 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 Lesser General Public License for more details
 * (http://www.gnu.org/copyleft/lesser.html).
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcckit.plot;

import jcckit.graphic.GraphPoint;
import jcckit.graphic.GraphicAttributes;
import jcckit.graphic.GraphicalComposite;
import jcckit.graphic.GraphicalElement;
import jcckit.graphic.Rectangle;
import jcckit.util.ConfigParameters;
import jcckit.util.Factory;

/**
 * Symbol factory for creating symbols with error bars. It wraps 
 * a {@link SymbolFactory} for creating the symbol. The error bars
 * are {@link Rectangle Rectangles}. 
 * 

 * Curves with error bars are based on two 
 * {@link jcckit.data.DataCurve DataCurves}:
 * 
The plain curve.
 *     
An instance which stores the errors in x and y.
 *         It is assumed that the errors are positive values defining
 *         the error symmetrically around the curve points.
 * 
 * 

 * The ErrorBarFactory needs an instance of {@link PositionHint}
 * as initial {@link Hint} for the next curve. Its origin must be
 * the origin of the data coordinate system in device-independent coordinates.
 * The position of PositionHint must be undefined.
 * 
 * @author Franz-Josef Elmer
 */
public class ErrorBarFactory implements SymbolFactory {
  /** Configuration parameter key. */
  public static final String SYMBOL_FACTORY_KEY = "symbolFactory";

  private final SymbolFactory _symbolFactory;
  private final GraphicAttributes _attributes;
  private final double _size;

  /**
   * Creates an instance from the specified configuration parameters.
   * 
   * 
   *     
   * 
   *     
   *     
   * 
   *     
   *     
   * 
   *     
   *     
   * 
Key & Default Value
Type
Mandatory
Description
symbolFactory = null
ConfigParameters
no
Definition of the wrapped {@link SymbolFactory} which generates
   *         the curve symbol without bars. By default an empty
   *         {@link GraphicalComposite} will be created.
size = 0
double
no
Width of the error bars.
attributes = null
ConfigParameters
no
Definition of the {@link GraphicAttributes} of the error 
   *         bars.
   */
  public ErrorBarFactory(ConfigParameters config) {
    _symbolFactory = (SymbolFactory) Factory.createOrGet(
        config.getNode(SYMBOL_FACTORY_KEY), null);
    _size = config.getDouble(SIZE_KEY, 0);
    _attributes = (GraphicAttributes) Factory.createOrGet(
        config.getNode(ATTRIBUTES_KEY), null);
  }

  /**
   * Creates the legend symbol. Calls the wrapped {@link SymbolFactory}
   * or returns an empty instance of {@link GraphicalComposite} if undefined.
   */
  public GraphicalElement createLegendSymbol(GraphPoint centerPosition,
                                             double size) {
    return _symbolFactory == null ? new GraphicalComposite(null)
              : _symbolFactory.createLegendSymbol(centerPosition, size);
  }

  /**
   * Creates either the curve symbol or the error bars. Error bars are
   * created when hintFromPreviousCurve is an instance of
   * {@link PositionHint} and its position attribute is not null.
   * Otherwise the curve symbol is created. The position attributes stores
   * the curve point (in device-independent coordinates). The origin is
   * always as set in the initial PositionHint. The hint for
   * the next curve wrapped by the returned Symbol is always
   * a PositionHint.
   */
  public Symbol createSymbol(GraphPoint point, Hint hintFromPreviousPoint,
                             Hint hintFromPreviousCurve) {
    GraphPoint origin = new GraphPoint(null);
    GraphPoint position = null;
    if (hintFromPreviousCurve instanceof PositionHint) {
      origin = ((PositionHint) hintFromPreviousCurve).getOrigin();
      position = ((PositionHint) hintFromPreviousCurve).getPosition();
    }
    if (position == null) {
      if (_symbolFactory == null) {
        return new Symbol(new GraphicalComposite(null), hintFromPreviousPoint,
                          new PositionHint(origin, point));
      } else {
        return _symbolFactory.createSymbol(point, hintFromPreviousPoint,
                                           new PositionHint(origin, point));
      }
    } else {
      double xError = point.getX() - origin.getX();
      double yError = point.getY() - origin.getY();
      GraphicalComposite errorBars = new GraphicalComposite(null);
      if (xError > 0) {
        errorBars.addElement(new Rectangle(position, 2 * xError, _size, 
                                           _attributes));
      }
      if (yError > 0) {
        errorBars.addElement(new Rectangle(position, _size, 2 * yError, 
                                           _attributes));
      }
      return new Symbol(errorBars, hintFromPreviousPoint, 
                        new PositionHint(origin, null));
    }
  }
}