PointChart


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16   *  Auvil.  For written permission, please contact nathaniel_auvil@users.sourceforge.net
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34  
35  package org.krysalis.jcharts.axisChart;
36  
37  
38  import org.krysalis.jcharts.chartData.interfaces.IAxisChartDataSet;
39  import org.krysalis.jcharts.chartData.interfaces.IDataSeries;
40  import org.krysalis.jcharts.imageMap.CircleMapArea;
41  import org.krysalis.jcharts.properties.PointChartProperties;
42  import org.krysalis.jcharts.properties.DataAxisProperties;
43  
44  import java.awt.*;
45  import java.awt.geom.AffineTransform  ;
46  import java.awt.geom.Rectangle2D  ;
47  
48  
49  /*************************************************************************************
50   *
51   * @author Nathaniel Auvil
52   * @version $Id: PointChart.java,v 1.1 2003/05/17 16:56:57 nathaniel_auvil Exp $
53   ************************************************************************************/
54  abstract class PointChart
55  {
56  
57      /********************************************************************************************
58       * Draws the chart
59       *
60       * @param axisChart
61       * @param iAxisChartDataSet
62       *********************************************************************************************/
63      static void render( AxisChart axisChart, IAxisChartDataSet iAxisChartDataSet )
64      {
65          Graphics2D g2d=axisChart.getGraphics2D();
66          PointChartProperties pointChartProperties=(PointChartProperties) iAxisChartDataSet.getChartTypeProperties();
67  
68          //---Point Charts can not be horizontal so we know the y-axis is DataAxisProperties
69          DataAxisProperties dataAxisProperties= (DataAxisProperties) axisChart.getAxisProperties().getYAxisProperties();
70          IDataSeries iDataSeries= (IDataSeries) axisChart.getIAxisDataSeries();
71  
72  
73          float xPosition=axisChart.getXAxis().getTickStart();
74          float yPosition;
75  
76          //---when centering the shapes on the points, need x and y offset to do this
77          double[] cornerXOffset=new double[ iAxisChartDataSet.getNumberOfDataSets() ];
78          double[] cornerYOffset=new double[ iAxisChartDataSet.getNumberOfDataSets() ];
79  
80  
81          //---get the original transform so can reset it.
82          AffineTransform   affineTransform=g2d.getTransform();
83  
84          Rectangle2D   rectangle;
85  
86          //LOOP
87          //---pre-compute the dimensions of each Shape so do not do it in loop.
88          for( int i=0; i < iAxisChartDataSet.getNumberOfDataSets(); i++ )
89          {
90              rectangle=pointChartProperties.getShape( i ).getBounds2D();
91              cornerXOffset[ i ]=rectangle.getWidth() / 2;
92              cornerYOffset[ i ]=rectangle.getHeight() / 2;
93          }
94  
95          g2d.setStroke( PointChartProperties.DEFAULT_POINT_BORDER_STROKE );
96  
97          //LOOP
98          //---for each item in data set...
99          for( int i=0; i < iAxisChartDataSet.getNumberOfDataItems(); i++ )
100         {
101             //LOOP
102             //---for each data set
103             for( int dataSetIndex=0; dataSetIndex < iAxisChartDataSet.getNumberOfDataSets(); dataSetIndex++ )
104             {
105                 //---if the value is NaN, do not display a value
106                 if( Double.isNaN( iAxisChartDataSet.getValue( dataSetIndex, i ) ) )
107                 {
108                     continue;
109                 }
110 
111                 yPosition= axisChart.getYAxis().computeAxisCoordinate( axisChart.getYAxis().getOrigin(),
112                                                                                          iAxisChartDataSet.getValue( dataSetIndex, i ),
113                                                                                          axisChart.getYAxis().getScaleCalculator().getMinValue() );
114 
115                 //---if we are generating an ImageMap, store the image coordinates
116                 if( axisChart.getGenerateImageMapFlag() )
117                 {
118                     String   label;
119                     if( axisChart.getXAxis().getAxisLabelsGroup() != null )
120                     {
121                         label = axisChart.getXAxis().getAxisLabelsGroup().getTextTag( i ).getText();
122                     }
123                     else
124                     {
125                         label = null;
126                     }
127 
128                     axisChart.getImageMap().addImageMapArea( new CircleMapArea( xPosition,
129                                                                                                     yPosition,
130                                                                                                     iAxisChartDataSet.getValue( dataSetIndex, i ),
131                                                                                                     label,
132                                                                                                     iAxisChartDataSet.getLegendLabel( dataSetIndex ) ) );
133                 }
134 
135                 //---translate the Shape into position.
136                 g2d.translate( xPosition - cornerXOffset[ dataSetIndex ], yPosition - cornerYOffset[ dataSetIndex ] );
137 
138                 g2d.setPaint( iAxisChartDataSet.getPaint( dataSetIndex ) );
139 
140                 //---render the point
141                 if( pointChartProperties.getFillPointsFlag( dataSetIndex ) )
142                 {
143                     //---fill the point
144                     g2d.fill( pointChartProperties.getShape( dataSetIndex ) );
145 
146                     //---if we are filling the points, see if we should outline the Shape
147                     if( pointChartProperties.getPointOutlinePaints( dataSetIndex ) != null )
148                     {
149                         g2d.setPaint( pointChartProperties.getPointOutlinePaints( dataSetIndex ) );
150                         g2d.draw( pointChartProperties.getShape( dataSetIndex ) );
151                     }
152                 }
153                 else
154                 {
155                     //---if we are NOT filling the points, use the Paint specified with the DataSet to outline.
156                     g2d.draw( pointChartProperties.getShape( dataSetIndex ) );
157                 }
158 
159                 g2d.setTransform( affineTransform );
160             }
161 
162             //---move right to the next x-axis scale item
163             xPosition+=axisChart.getXAxis().getScalePixelWidth();
164         }
165     }
166 }
167
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