/**************************************************************************
/* This class is part of the Java Plotlib Toolkit.
/*
/* Copyright (c) 1999-2004 by Bernhard Bablok (bablokb@gmx.de)
/*
/* 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 2 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 Library General Public License for more details.
/*
/* You should have received a copy of the GNU General Public License
/* along with this program; see the file COPYING.  If not, write to
/* the Free Software Foundation Inc., 59 Temple Place - Suite 330,
/* Boston, MA  02111-1307 USA
/**************************************************************************/
package de.bablokb.plotlib.plot;

import java.util.*;
import java.awt.*;
import java.awt.geom.*;
import de.bablokb.plotlib.core.*;
import de.bablokb.plotlib.data.*;

/**
   For every datapoint, plot a line from the x-axis to the datapoint.

   @version $Revision: 1.3 $
   @author  $Author: bablokb $
*/

public class BarPlot extends DataPlot {
  
  /**
     Baseline (usually value of y-coordinate of x-axis).
  */

  private float iBase = 0;

  //////////////////////////////////////////////////////////////////////////////

  /**
     Construct a BarPlot-object without data.
  */

  public BarPlot() {
    super();
  }

  //////////////////////////////////////////////////////////////////////////////

  /**
     Construct a BarPlot-object from a given dataset.
  */

  public BarPlot(Dataset data) {
    super(data);
  }

  //////////////////////////////////////////////////////////////////////////////

  /**
     Set the value of the baseline.
  */

  public void setBase(float base) {
    iBase = base;
  }

  //////////////////////////////////////////////////////////////////////////////

  /**
     Plot the data. Implements AbstractPlottable.plotObjects.
  */

  public void plotObjects(PlottingContext pc) {
    if (iData == null)
      throw new MissingDatasetException();

    GeneralPath gp = new GeneralPath();
    Iterator it = iData.iterator();
    while (it.hasNext()) {
      Point2D p = (Point2D) it.next(), base = (Point2D) p.clone();
      base.setLocation(p.getX(),iBase);
      p    = pc.transform(p);
      base = pc.transform(base);
      gp.moveTo((float) base.getX(), (float) base.getY());
      gp.lineTo((float) p.getX(), (float) p.getY());
    }
    Graphics2D g2 = pc.getG2();
    g2.draw(gp);
  }
}