Package org.krysalis.jcharts.axisChart

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

/***********************************************************************************************
* 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 com.google.code.appengine.awt.Graphics2D;
import com.google.code.appengine.awt.geom.Rectangle2D;

import org.krysalis.jcharts.axisChart.customRenderers.axisValue.AxisValueRenderEvent;
import org.krysalis.jcharts.chartData.interfaces.IAxisChartDataSet;
import org.krysalis.jcharts.chartText.TextTagGroup;
import org.krysalis.jcharts.imageMap.RectMapArea;
import org.krysalis.jcharts.properties.BarChartProperties;


/*****************************************************************************************
* @author Nathaniel Auvil
* @version $Id: BarChart.java,v 1.3 2004/05/27 02:15:19 nathaniel_auvil Exp $
****************************************************************************************/
abstract class BarChart
{

  /***************************************************************************************
   * Draws the chart uses Rectangle2D......keep having rounding problems.
   *
   * @param axisChart
   * @param iAxisChartDataSet
   **************************************************************************************/
  static void render( AxisChart axisChart, IAxisChartDataSet iAxisChartDataSet )
  {
    Graphics2D g2d = axisChart.getGraphics2D();
    BarChartProperties barChartProperties = (BarChartProperties) iAxisChartDataSet.getChartTypeProperties();
    float barWidth;

    //---y axis position on screen to start drawing.
    float startingX;
    float startingY;
    float width;
    float height;

    if( axisChart.getAxisProperties().isPlotHorizontal() )
    {
      barWidth = axisChart.getYAxis().getScalePixelWidth() * barChartProperties.getPercentage();
      startingX = axisChart.getXAxis().getZeroLineCoordinate();
      startingY = axisChart.getYAxis().getLastTickY() - (barWidth / 2);
      width = 0;
      height = barWidth;
      Rectangle2D.Float rectangle = new Rectangle2D.Float( startingX, startingY, width, height );

      BarChart.horizontalPlotaxisChart,
                        iAxisChartDataSet,
                        barChartProperties,
                        g2d,
                        rectangle,
                        startingX );
    }
    else
    {
      barWidth = axisChart.getXAxis().getScalePixelWidth() * barChartProperties.getPercentage();
      startingX = axisChart.getXAxis().getTickStart() - (barWidth / 2);
      startingY = axisChart.getYAxis().getZeroLineCoordinate();
      width = barWidth;
      height = 0;
      Rectangle2D.Float rectangle = new Rectangle2D.Float( startingX, startingY, width, height );

      BarChart.verticalPlotaxisChart,
                      iAxisChartDataSet,
                      barChartProperties,
                      g2d,
                      rectangle,
                      startingY );
    }
  }


  /***************************************************************************************
   * @param axisChart
   * @param iAxisChartDataSet
   * @param barChartProperties
   * @param g2d
   * @param rectangle
   * @param startingX
   **************************************************************************************/
  private static void horizontalPlot( AxisChart axisChart,
                          IAxisChartDataSet iAxisChartDataSet,
                          BarChartProperties barChartProperties,
                          Graphics2D g2d,
                          Rectangle2D.Float rectangle,
                          float startingX )
  {
    int imageMapLabelIndex = axisChart.getYAxis().getNumberOfScaleItems() - 1;

    //---setup the total area rectangle
    Rectangle2D.Float totalItemArea = new Rectangle2D.Float();
    totalItemArea.y = axisChart.getYAxis().getOrigin() - axisChart.getYAxis().getPixelLength() + 1;
    totalItemArea.height = axisChart.getYAxis().getScalePixelWidth() - 1;
    totalItemArea.x = axisChart.getXAxis().getOrigin() + 1;
    totalItemArea.width = axisChart.getXAxis().getPixelLength() - 1;

    //---reuse the same Object for pre and post render events.
    AxisValueRenderEvent axisValueRenderEvent = new AxisValueRenderEvent( axisChart,
                                                  iAxisChartDataSet,
                                                  g2d,
                                                  totalItemArea,
                                                  axisChart.getXAxis().getZeroLineCoordinate() );

    //---there is only ever one data set for a regular bar chart
    axisValueRenderEvent.setDataSetIndex( 0 );

    //LOOP
    for( int i = 0; i < iAxisChartDataSet.getNumberOfDataItems(); i++ )
    {
      //---reset the paint as it might have changed for the outline drawing
      g2d.setPaint( iAxisChartDataSet.getPaint( 0 ) );

      //---set values for the preRender event
      axisValueRenderEvent.setValueX( axisChart.getXAxis().getZeroLineCoordinate() );
      axisValueRenderEvent.setValueY( (float) rectangle.getCenterY() );
      axisValueRenderEvent.setValueIndex( i );

      //---we want to do this regardless if we render an item
      barChartProperties.firePreRender( axisValueRenderEvent );

      //---if value == 0 do not plot anything.
      if( iAxisChartDataSet.getValue( 0, i ) != 0.0d )
      {
        if( iAxisChartDataSet.getValue( 0, i ) < 0 )
        {
          rectangle.x = axisChart.getXAxis().computeAxisCoordinate( axisChart.getXAxis().getOrigin(),
                                                  iAxisChartDataSet.getValue( 0, i ),
                                                  axisChart.getXAxis().getScaleCalculator().getMinValue() );
          rectangle.width = startingX - rectangle.x;

          //---set values for the postRender event
          axisValueRenderEvent.setValueX( rectangle.x );
        }
        else
        {
          rectangle.x = startingX;
          rectangle.width = BarChart.computeScaleHeightOfValue( iAxisChartDataSet.getValue( 0, i ),
                                              axisChart.getXAxis().getOneUnitPixelSize() );

          //---set values for the postRender event
          axisValueRenderEvent.setValueX( rectangle.x + rectangle.width );
        }

        //---with a user defined scale, we could have non-zero data points with a height of zero.
        if( rectangle.width != 0 )
        {
          g2d.fill( rectangle );

          if( barChartProperties.getShowOutlinesFlag() )
          {
            barChartProperties.getBarOutlineStroke().draw( g2d, rectangle );
          }

          //---if we are generating an ImageMap, store the image coordinates
          if( axisChart.getGenerateImageMapFlag() )
          {
            RectMapArea rectMapArea= createImageMapArea( axisChart.getYAxis().getAxisLabelsGroup(),
                                          imageMapLabelIndex,
                                          rectangle,
                                          iAxisChartDataSet.getValue( 0, i ),
                                          iAxisChartDataSet.getLegendLabel( 0 ) );
            axisChart.getImageMap().addImageMapArea( rectMapArea );
           
            imageMapLabelIndex--;
          }
        }
      }
      else
      {
        //---else, value is zero.

        //---if we are generating an ImageMap, store the image coordinates
        if( axisChart.getGenerateImageMapFlag() )
        {
          //---check if zero scale line is visible
          //---make sure zero is even visible on the scale.
          //---If zero is not visible on scale nothing will be clickable for that item
          if( axisChart.getXAxis().getScaleCalculator().getMaxValue() >= 0
              && axisChart.getXAxis().getScaleCalculator().getMinValue() <= 0 )
          {
            rectangle.x = startingX;
            rectangle.width = 1;
             
            RectMapArea rectMapArea = createImageMapArea( axisChart.getYAxis().getAxisLabelsGroup(),
                                            imageMapLabelIndex,
                                            rectangle,
                                            iAxisChartDataSet.getValue( 0, i ),
                                            iAxisChartDataSet.getLegendLabel( 0 ) );

            axisChart.getImageMap().addImageMapArea( rectMapArea );           
          }
         
          imageMapLabelIndex--;
        }
      }

      //---notify everyone we just rendered
      barChartProperties.firePostRender( axisValueRenderEvent );
      totalItemArea.y += axisChart.getYAxis().getScalePixelWidth();

      rectangle.y += axisChart.getYAxis().getScalePixelWidth();
    }
  }


  /***************************************************************************************
   * @param axisChart
   * @param iAxisChartDataSet
   * @param barChartProperties
   * @param g2d
   * @param rectangle
   * @param startingY
   **************************************************************************************/
  private static void verticalPlot( AxisChart axisChart,
                          IAxisChartDataSet iAxisChartDataSet,
                          BarChartProperties barChartProperties,
                          Graphics2D g2d,
                          Rectangle2D.Float rectangle,
                          float startingY )
  {
    //---setup the total area rectangle
    Rectangle2D.Float totalItemArea = new Rectangle2D.Float();
    totalItemArea.x = axisChart.getXAxis().getOrigin() + 1;
    totalItemArea.y = axisChart.getYAxis().getOrigin() - axisChart.getYAxis().getPixelLength() + 1;
    totalItemArea.width = axisChart.getXAxis().getScalePixelWidth() - 1;
    totalItemArea.height = axisChart.getYAxis().getPixelLength() - 1;

    //---reuse the same Object for pre and post render events.
    AxisValueRenderEvent axisValueRenderEvent = new AxisValueRenderEvent( axisChart,
                                                  iAxisChartDataSet,
                                                  g2d,
                                                  totalItemArea,
                                                  axisChart.getYAxis().getZeroLineCoordinate() );

    //---there is only ever one data set for a regular bar chart
    axisValueRenderEvent.setDataSetIndex( 0 );

    //LOOP
    for( int i = 0; i < iAxisChartDataSet.getNumberOfDataItems(); i++ )
    {
      //---reset the paint as it might have changed for the outline drawing
      g2d.setPaint( iAxisChartDataSet.getPaint( 0 ) );

      //---set values for the preRender event
      axisValueRenderEvent.setValueX( (float) rectangle.getCenterX() );
      axisValueRenderEvent.setValueY( axisChart.getYAxis().getZeroLineCoordinate() );
      axisValueRenderEvent.setValueIndex( i );

      //---we want to do this regardless if we render an item
      barChartProperties.firePreRender( axisValueRenderEvent );

      //---if value == 0 do not plot anything.
      if( iAxisChartDataSet.getValue( 0, i ) != 0.0d )
      {
        if( iAxisChartDataSet.getValue( 0, i ) < 0 )
        {
          rectangle.y = startingY;
          rectangle.height = BarChart.computeScaleHeightOfValue( iAxisChartDataSet.getValue( 0, i ), axisChart.getYAxis().getOneUnitPixelSize() );

          axisValueRenderEvent.setValueY( rectangle.y + rectangle.height );
        }
        else
        {
          rectangle.y = axisChart.getYAxis().computeAxisCoordinate( axisChart.getYAxis().getOrigin(),
                                                 iAxisChartDataSet.getValue( 0, i ),
                                                 axisChart.getYAxis().getScaleCalculator().getMinValue() );
          rectangle.height = startingY - rectangle.y;

          axisValueRenderEvent.setValueY( rectangle.y );
        }

       
        //---with a user defined scale, we could have non-zero data points with a height of zero.
        if( rectangle.height != 0 )
        {
          g2d.fill( rectangle );

          if( barChartProperties.getShowOutlinesFlag() )
          {
            barChartProperties.getBarOutlineStroke().draw( g2d, rectangle );
            g2d.setPaint( iAxisChartDataSet.getPaint( 0 ) );
          }
        }

        //---even if the bar is not visible, we still need to generate an ImageMapArea
        if( axisChart.getGenerateImageMapFlag() )
        {
          RectMapArea rectMapArea = createImageMapArea( axisChart.getXAxis().getAxisLabelsGroup(),
                                          i,
                                          rectangle,
                                          iAxisChartDataSet.getValue( 0, i ),
                                          iAxisChartDataSet.getLegendLabel( 0 ) );

          axisChart.getImageMap().addImageMapArea( rectMapArea );
        }
      }
      else
      {
        //---if we are generating an ImageMap, store the image coordinates
        if( axisChart.getGenerateImageMapFlag() )
        {
          //---make sure zero is even visible on the scale.
          //---If zero is not visible on scale nothing will be clickable for that item
          if( axisChart.getYAxis().getScaleCalculator().getMaxValue() >= 0
              && axisChart.getYAxis().getScaleCalculator().getMinValue() <= 0 )
          {
            rectangle.y = startingY;
            rectangle.height = 1;
             
            RectMapArea rectMapArea = createImageMapArea( axisChart.getXAxis().getAxisLabelsGroup(),
                                            i,
                                            rectangle,
                                            iAxisChartDataSet.getValue( 0, i ),
                                            iAxisChartDataSet.getLegendLabel( 0 ) );

            axisChart.getImageMap().addImageMapArea( rectMapArea );           
          }
        }
      }

      //---notify everyone we just rendered
      barChartProperties.firePostRender( axisValueRenderEvent );
      totalItemArea.x += axisChart.getXAxis().getScalePixelWidth();

      rectangle.x += axisChart.getXAxis().getScalePixelWidth();
    }
  }


  /***************************************************************************************
   * Takes a value and determines the number of pixels it should fill on the screen. If
   * there is a user defined scale and the passed value is greater than the MAX or less
   * than the MIN, the height will be forced to the MAX or MIN respectively.
   *
   * @param value
   * @param oneUnitPixelSize
   * @return float the screen pixel coordinate
   **************************************************************************************/
  static float computeScaleHeightOfValue( double value, double oneUnitPixelSize )
  {
    return (float) Math.abs( (value) * oneUnitPixelSize );
  }


  /***************************************************************************************
   * @param axisLabelsGroup
   * @param labelIndex
   * @param rectangle
   * @param value
   * @param legendLabel
   * @return RectMapArea
   **************************************************************************************/
  private static RectMapArea createImageMapArea( TextTagGroup axisLabelsGroup,
                                   int labelIndex,
                                  Rectangle2D.Float rectangle,
                                  double value,
                                  String legendLabel )
  {
    String label;
    if( axisLabelsGroup != null )
    {
      label = axisLabelsGroup.getTextTag( labelIndex ).getText();
    }
    else
    {
      label = "";
    }

    return new RectMapArea( rectangle, value, label, legendLabel );
  }
}
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