Package org.krysalis.jcharts.axisChart

Source Code of org.krysalis.jcharts.axisChart.AreaChart

/***********************************************************************************************
* Copyright 2002 (C) Nathaniel G. Auvil. All Rights Reserved.
*
* Redistribution and use of this software and associated documentation ("Software"), with or
* without modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain copyright statements and notices.
*   Redistributions must also contain a copy of this document.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of
*   conditions and the following disclaimer in the documentation and/or other materials
*   provided with the distribution.
*
* 3. The name "jCharts" or "Nathaniel G. Auvil" must not be used to endorse or promote
*   products derived from this Software without prior written permission of Nathaniel G.
*   Auvil.  For written permission, please contact nathaniel_auvil@users.sourceforge.net
*
* 4. Products derived from this Software may not be called "jCharts" nor may "jCharts" appear
*   in their names without prior written permission of Nathaniel G. Auvil. jCharts is a
*   registered trademark of Nathaniel G. Auvil.
*
* 5. Due credit should be given to the jCharts Project (http://jcharts.sourceforge.net/).
*
* THIS SOFTWARE IS PROVIDED BY Nathaniel G. Auvil AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
* jCharts OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
************************************************************************************************/

package org.krysalis.jcharts.axisChart;


import org.krysalis.jcharts.chartData.interfaces.IAxisChartDataSet;
import org.krysalis.jcharts.imageMap.ImageMapNotSupportedException;

import java.awt.*;
import java.awt.geom.Area;
import java.awt.geom.GeneralPath;


/*************************************************************************************
*
* @author Nathaniel Auvil
* @version $Id: AreaChart.java,v 1.3 2004/05/31 15:39:53 nathaniel_auvil Exp $
************************************************************************************/
abstract class AreaChart
{

  /********************************************************************************************
   * Draws the chart
   *
   * @param axisChart
   * @param iAxisChartDataSet
   *********************************************************************************************/
  static void render( AxisChart axisChart, IAxisChartDataSet iAxisChartDataSet )
  {
    //---hopefully eliminate support requests asking about this...
    if( axisChart.getImageMap() != null )
    {
//todo should we do a point image map?
      throw new ImageMapNotSupportedException( "HTML client-side image maps are not supported on Area Charts." );
    }


    //AreaChartProperties areaChartProperties=(AreaChartProperties) iAxisChartDataSet.getChartTypeProperties();
    float xPosition=axisChart.getXAxis().getTickStart();

    GeneralPath generalPaths[]=new GeneralPath[ iAxisChartDataSet.getNumberOfDataSets() ];


    //---AreaCharts can not be drawn on a horizontal axis so y-axis will always be the data axis
    //DataAxisProperties dataAxisProperties= (DataAxisProperties) axisChart.getAxisProperties().getYAxisProperties();


    //LOOP
    //---initial postion of each line must be set with call to moveTo()
    //---Do this here so every point does not have to check....if( i == 0 )... in loop
    for( int i=0; i < generalPaths.length; i++ )
    {
      generalPaths[ i ]=new GeneralPath();
      generalPaths[ i ].moveTo( xPosition, axisChart.getYAxis().getZeroLineCoordinate() );
      generalPaths[ i ].lineTo( xPosition, axisChart.getYAxis().computeAxisCoordinate( axisChart.getYAxis().getOrigin(),
                                                            iAxisChartDataSet.getValue( i, 0 ),
                                                            axisChart.getYAxis().getScaleCalculator().getMinValue() ) );
    }

    //LOOP
    for( int j=1; j < iAxisChartDataSet.getNumberOfDataItems(); j++ )
    {
      xPosition+=axisChart.getXAxis().getScalePixelWidth();

      //LOOP
      for( int i=0; i < generalPaths.length; i++ )
      {
        generalPaths[ i ].lineTo( xPosition, axisChart.getYAxis().computeAxisCoordinate( axisChart.getYAxis().getOrigin(),
                                                              iAxisChartDataSet.getValue( i, j ),
                                                              axisChart.getYAxis().getScaleCalculator().getMinValue() ) );
      }
    }


    Area[] areas=new Area[ generalPaths.length ];


    //LOOP
    //---close the path. Do this here so do not have to check if last every pass through above loop.
    for( int i=0; i < generalPaths.length; i++ )
    {
      generalPaths[ i ].lineTo( xPosition, axisChart.getYAxis().getZeroLineCoordinate() );
      generalPaths[ i ].closePath();

      areas[ i ]=new Area( generalPaths[ i ] );
    }

    Graphics2D g2d=axisChart.getGraphics2D();

    //LOOP
    //---draw each path to the image
    for( int i=0; i < areas.length; i++ )
    {
      g2d.setPaint( iAxisChartDataSet.getPaint( i ) );
      g2d.fill( areas[ i ] );
    }
  }

}
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