天空，像刀鋒一樣 藍

在使用birt構建各種報表的過程中，也許希望自定義輸出的圖形的顏色，例如餅圖的各個切片的顏色。如果使用的報表模板的情況，可以很方便的在制作報表的時候通過birt提供的界面設置；當使用birt提供的api進行報表建立的時候，該怎么做呢？經過一番研究，我終于找到了解決方法。

修改pie中每個切片顏色的方法其實很簡單，在構造pie之中，在"Base Series"步驟中，構造一個顏色數組Fill[] fiaBase，里面存儲顏色，pie使用的時候按照數據順序取出，與切片大小無關。

其中顏色數據可以是ColorDefinitionImpl.RED( )，也可以調用其構造方法輸入三原色創造顏色：ColorDefinitionImpl.create(128, 128, 255)。

實際使用中，可以嘗試在自己封裝的方法中包含這個色彩數組參數。

  1package com.zte.audit.core;
  2
  3import org.eclipse.birt.chart.device.IDeviceRenderer;
  4import org.eclipse.birt.chart.factory.GeneratedChartState;
  5import org.eclipse.birt.chart.factory.Generator;
  6import org.eclipse.birt.chart.factory.RunTimeContext;
  7import org.eclipse.birt.chart.model.Chart;
  8import org.eclipse.birt.chart.model.ChartWithoutAxes;
  9import org.eclipse.birt.chart.model.attribute.Bounds;
 10import org.eclipse.birt.chart.model.attribute.ChartDimension;
 11import org.eclipse.birt.chart.model.attribute.Fill;
 12import org.eclipse.birt.chart.model.attribute.impl.BoundsImpl;
 13import org.eclipse.birt.chart.model.attribute.impl.ColorDefinitionImpl;
 14import org.eclipse.birt.chart.model.attribute.impl.GradientImpl;
 15import org.eclipse.birt.chart.model.component.Series;
 16import org.eclipse.birt.chart.model.component.impl.SeriesImpl;
 17import org.eclipse.birt.chart.model.data.BaseSampleData;
 18import org.eclipse.birt.chart.model.data.DataFactory;
 19import org.eclipse.birt.chart.model.data.NumberDataSet;
 20import org.eclipse.birt.chart.model.data.OrthogonalSampleData;
 21import org.eclipse.birt.chart.model.data.SampleData;
 22import org.eclipse.birt.chart.model.data.SeriesDefinition;
 23import org.eclipse.birt.chart.model.data.TextDataSet;
 24import org.eclipse.birt.chart.model.data.impl.NumberDataSetImpl;
 25import org.eclipse.birt.chart.model.data.impl.SeriesDefinitionImpl;
 26import org.eclipse.birt.chart.model.data.impl.TextDataSetImpl;
 27import org.eclipse.birt.chart.model.impl.ChartWithoutAxesImpl;
 28import org.eclipse.birt.chart.model.layout.Legend;
 29import org.eclipse.birt.chart.model.type.PieSeries;
 30import org.eclipse.birt.chart.model.type.impl.PieSeriesImpl;
 31import org.eclipse.birt.chart.util.PluginSettings;
 32import org.eclipse.swt.SWT;
 33import org.eclipse.swt.events.ControlEvent;
 34import org.eclipse.swt.events.ControlListener;
 35import org.eclipse.swt.events.PaintEvent;
 36import org.eclipse.swt.events.PaintListener;
 37import org.eclipse.swt.graphics.GC;
 38import org.eclipse.swt.graphics.Image;
 39import org.eclipse.swt.graphics.Rectangle;
 40import org.eclipse.swt.layout.FillLayout;
 41import org.eclipse.swt.widgets.Canvas;
 42import org.eclipse.swt.widgets.Display;
 43import org.eclipse.swt.widgets.Shell;
 44
 45public class Pie {
 46    public static final Chart createPie( )
 47    {
 48        ChartWithoutAxes cwoaPie = ChartWithoutAxesImpl.create( );
 49        cwoaPie.setDimension( ChartDimension.TWO_DIMENSIONAL_WITH_DEPTH_LITERAL );
 50        cwoaPie.setType( "Pie Chart" ); //$NON-NLS-1$    
 51        cwoaPie.setSubType( "Standard Pie Chart" ); //$NON-NLS-1$
 52        
 53        // Plot
 54        cwoaPie.setSeriesThickness( 10 );
 55
 56        // Legend
 57        Legend lg = cwoaPie.getLegend( );
 58        lg.getOutline( ).setVisible( true );
 59    
 60        
 61        // Title
 62        cwoaPie.getTitle( ).getLabel( ).getCaption( ).setValue( "Pie Chart" );//$NON-NLS-1$
 63
 64        // Data Set
 65        TextDataSet categoryValues = TextDataSetImpl.create( new String[]{
 66                "New York", "Boston", "Chicago", "San Francisco", "Dallas","cs"} );//$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$
 67        NumberDataSet seriesOneValues = NumberDataSetImpl.create( new double[]{
 68                54.65, 21, 75.95, 91.28, 37.43,2.2
 69        } );
 70        
 71        SampleData sdata = DataFactory.eINSTANCE.createSampleData( );
 72        BaseSampleData sdBase = DataFactory.eINSTANCE.createBaseSampleData( );
 73        sdBase.setDataSetRepresentation( "" );//$NON-NLS-1$
 74        sdata.getBaseSampleData( ).add( sdBase );
 75
 76        OrthogonalSampleData sdOrthogonal = DataFactory.eINSTANCE.createOrthogonalSampleData( );
 77        sdOrthogonal.setDataSetRepresentation( "" );//$NON-NLS-1$
 78        sdOrthogonal.setSeriesDefinitionIndex( 0 );
 79        sdata.getOrthogonalSampleData( ).add( sdOrthogonal );
 80
 81        cwoaPie.setSampleData( sdata );
 82
 83        // Base Series
 84        Series seCategory = SeriesImpl.create( );
 85        seCategory.setDataSet( categoryValues );
 86
 87        SeriesDefinition sd = SeriesDefinitionImpl.create( );
 88        cwoaPie.getSeriesDefinitions( ).add( sd );
 89        //sd.getSeriesPalette( ).shift( 0 );
 90        final Fill[] fiaBase = {
 91                ColorDefinitionImpl.create( 45, 150, 225 ),
 92                ColorDefinitionImpl.ORANGE( ),
 93                ColorDefinitionImpl.CREAM( ),
 94                ColorDefinitionImpl.RED( ),
 95                ColorDefinitionImpl.GREEN( ),
 96                GradientImpl.create( ColorDefinitionImpl.create( 225, 225, 255 ),
 97                        ColorDefinitionImpl.create( 255, 255, 225 ),
 98                        -35,
 99                        false ),
100                ColorDefinitionImpl.CYAN( ).darker( ),
101        };
102        sd.getSeriesPalette( ).getEntries( ).clear( );
103        for ( int i = 0; i < fiaBase.length; i++ )
104        {
105            sd.getSeriesPalette( ).getEntries( ).add( fiaBase[i] );
106        }
107        
108        
109        sd.getSeriesPalette( ).getEntries( );
110        sd.getSeries( ).add( seCategory );
111
112        // Orthogonal Series
113        PieSeries sePie = (PieSeries) PieSeriesImpl.create( );
114        sePie.setDataSet( seriesOneValues );
115        sePie.setSeriesIdentifier( "Cities" );//$NON-NLS-1$ 
116        sePie.setExplosion( 5 );
117        
118        SeriesDefinition sdCity = SeriesDefinitionImpl.create( );
119        sd.getSeriesDefinitions( ).add( sdCity );
120        sdCity.getSeries( ).add( sePie );
121        
122
123        return cwoaPie;
124    }
125
126    public static void main(String args[]){
127        Display display = Display.getDefault();
128        Shell shell = new Shell(display);
129        shell.setLayout(new FillLayout());
130        
131        final Shell finalShell = shell;
132        
133        Image image = null;
134        
135        
136        
137        Rectangle re = shell.getClientArea( );
138        final Rectangle adjustedRe = new Rectangle( 0, 0, re.width , re.height  );
139        image = new Image(display,adjustedRe);
140        
141        update(image,re);
142        
143        final Image imageFinal = image;
144        final Canvas canvas = new Canvas(shell,SWT.BORDER);
145        canvas.addPaintListener(new PaintListener(){
146
147            public void paintControl(PaintEvent e) {
148                e.gc.drawImage(imageFinal, 0, 0);
149                
150            }
151            
152        });
153        
154        canvas.addControlListener(new ControlListener(){
155
156            public void controlMoved(ControlEvent e) {
157            }
158
159            public void controlResized(ControlEvent e) {
160                
161                //update(imageFinal,adjustedRe);
162            }
163            
164        });
165        
166        
167        shell.open();
168        
169        while(!shell.isDisposed()){
170            if(!display.readAndDispatch()){
171                display.sleep();
172            }
173        }
174        
175        display.dispose();
176    }
177    
178    private static int X_OFFSET = 3;
179
180    private static int Y_OFFSET = 3;
181    
182    public static void update(Image buffer,Rectangle adjustedRe){
183        GC gc = new GC( buffer );
184
185        // fill default backgournd as white.
186        gc.setForeground( Display.getDefault( )
187                .getSystemColor( SWT.COLOR_WHITE ) );
188        gc.fillRectangle( buffer.getBounds( ) );
189
190        final Bounds bo = BoundsImpl.create( X_OFFSET,
191                Y_OFFSET,
192                adjustedRe.width - 2 * X_OFFSET,
193                adjustedRe.height - 2 * Y_OFFSET );
194
195        IDeviceRenderer deviceRenderer = null;
196        try
197        {
198            deviceRenderer = PluginSettings.instance( )
199                    .getDevice( "dv.SWT" ); //$NON-NLS-1$
200            deviceRenderer.setProperty( IDeviceRenderer.GRAPHICS_CONTEXT,
201                    gc );
202            bo.scale( 72d / deviceRenderer.getDisplayServer( )
203                    .getDpiResolution( ) ); // CONVERT
204            deviceRenderer.getDisplayServer().getObserver();
205            // TO
206            // POINTS
207
208            // GENERATE AND RENDER THE CHART
209            final Generator gr = Generator.instance( );
210            RunTimeContext rtc = new RunTimeContext( );
211            
212            Chart cm = createPie();
213            cm.getBlock().getChildren();
214            GeneratedChartState state = gr.build( deviceRenderer.getDisplayServer( ),
215                    cm,
216                    bo,
217                    null,
218                    rtc,
219                    null );
220
221            gr.render( deviceRenderer, state );
222        }
223        catch ( Exception ex )
224        {
225            ex.printStackTrace();
226        }
227        finally
228        {
229            gc.dispose( );
230            if ( deviceRenderer != null )
231            {
232                deviceRenderer.dispose( );
233            }
234        }
235    }
236}
237