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[birt-charting-dev] data autobinding & piechart rendering
Hi,
 
I am looking into using the birt charting API to render an image from the chart. In the example below I try to create a PIE chart with autobinding to feed my data into the chart model dynamically and render it.
 
I have just started looking at the birt framework. I got the png image rendering working for other examples but not for the pie chart. Is there any working example for autobinding and piecharts? Also any good tutorials on the chart api and its series, datadefinitions, autobinding etc? I'd like to keep my code flexible and would like to dynamically bind data for PIE charts.
 
Any help is appreciated.
 
Thanks!
 
 
 
 
When running the (modified) example below I see a

Exception in thread "main"

java.lang.NullPointerException

at org.eclipse.birt.chart.internal.datafeed.GroupingLookupHelper.addLookupForBaseSeries(

GroupingLookupHelper.java:262)

at org.eclipse.birt.chart.internal.datafeed.GroupingLookupHelper.initRowExpressions(

GroupingLookupHelper.java:419)

at org.eclipse.birt.chart.internal.datafeed.GroupingLookupHelper.<init>(

GroupingLookupHelper.java:95)

at org.eclipse.birt.chart.internal.datafeed.DataProcessor.mapToChartResultSet(

DataProcessor.java:318)

at org.eclipse.birt.chart.internal.datafeed.DataProcessor.generateRuntimeSeries(

DataProcessor.java:496)

at org.eclipse.birt.chart.factory.Generator.bindData(

Generator.java:642)

at org.eclipse.birt.chart.factory.Generator.bindData(

Generator.java:594)

at PieChartBuilder.createImg(

PieChartBuilder.java:128)

at PieChartBuilder.build(

PieChartBuilder.java:78)

at PieChartBuilder.main(

PieChartBuilder.java:63)
 
 
 
The snippet below is the actual code that binds the data to the chart model

String[] set = {

"Items" };

Object[][] data = { {

new Integer(7), new Integer(2), new Integer(5) } };

IDataRowExpressionEvaluator dree =

new DataRowExpressionEvaluator(set,data);

try {

gr.bindData(dree, chart, new RunTimeContext());  // protected IGenerator gr = null;

...

 
 
 
 

import

 java.awt.Graphics;

import

 java.awt.Graphics2D;

import

 java.awt.image.BufferedImage;

import

 java.io.File;

import

 java.io.IOException;

import

 javax.imageio.ImageIO;

import

 org.eclipse.birt.chart.api.ChartEngine;

import

 org.eclipse.birt.chart.device.IDeviceRenderer;

import

 org.eclipse.birt.chart.exception.ChartException;

import

 org.eclipse.birt.chart.factory.Generator;

import

 org.eclipse.birt.chart.factory.IDataRowExpressionEvaluator;

import

 org.eclipse.birt.chart.factory.RunTimeContext;

import

 org.eclipse.birt.chart.model.ChartWithoutAxes;

import

 org.eclipse.birt.chart.model.attribute.Bounds;

import

 org.eclipse.birt.chart.model.attribute.ChartDimension;

import

 org.eclipse.birt.chart.model.attribute.impl.BoundsImpl;

import

 org.eclipse.birt.chart.model.attribute.impl.ColorDefinitionImpl;

import

 org.eclipse.birt.chart.model.component.Series;

import

 org.eclipse.birt.chart.model.component.impl.SeriesImpl;

import

 org.eclipse.birt.chart.model.data.NumberDataSet;

import

 org.eclipse.birt.chart.model.data.Query;

import

 org.eclipse.birt.chart.model.data.SeriesDefinition;

import

 org.eclipse.birt.chart.model.data.TextDataSet;

import

 org.eclipse.birt.chart.model.data.impl.NumberDataSetImpl;

import

 org.eclipse.birt.chart.model.data.impl.QueryImpl;

import

 org.eclipse.birt.chart.model.data.impl.SeriesDefinitionImpl;

import

 org.eclipse.birt.chart.model.data.impl.TextDataSetImpl;

import

 org.eclipse.birt.chart.model.impl.ChartWithoutAxesImpl;

import

 org.eclipse.birt.chart.model.layout.Legend;

import

 org.eclipse.birt.chart.model.layout.Plot;

import

 org.eclipse.birt.chart.model.type.PieSeries;

import

 org.eclipse.birt.chart.model.type.impl.PieSeriesImpl;

import

 org.eclipse.birt.core.framework.PlatformConfig;

import

 com.ibm.icu.util.ULocale;

/**

* Builds pie chart.

*

* @author Qi Liang

*/

public

 class PieChartBuilder extends AbstractChartBuilder {

SeriesDefinition

sdX = null;

/**

* Constructor.

*

* @param dataSet

* data for chart

*/

public PieChartBuilder(DataSet dataSet) {

super(dataSet);

title = "Pie Chart";

}

public static void main(String[] args) {

PieChartBuilder p =

new PieChartBuilder(DataSet.getInstance());

p.build();

}

/**

* Builds one chart.

*/

public void build() {

createChart();

buildPlot();

buildLegend();

buildTitle();

buildXAxis();

// buildYAxis();

buildXSeries();

// buildYSeries();

createImg();

}

public void createImg() {

PlatformConfig pf =

new PlatformConfig();

pf.setProperty(

"STANDALONE", true);

// Returns a singleton instance of the Chart Engine

ChartEngine ce = ChartEngine.instance(pf);

// Returns a singleton instance of the Generator

gr = ce.getGenerator();

try {

// device renderers for dv.SWT, dv.PNG, dv.JPG

// dv.PDF, dv.SVG, dv.SWING, dv.PNG24, div.BMP

dRenderer = ce.getRenderer("dv.PNG");

dServer = dRenderer.getDisplayServer();

}

catch (Exception ex) {

ex.printStackTrace();

}

BufferedImage img =

new BufferedImage(600, 600,

BufferedImage.

TYPE_INT_ARGB);

Graphics g = img.getGraphics();

Graphics2D g2d = (Graphics2D) g;

dRenderer.setProperty(IDeviceRenderer.GRAPHICS_CONTEXT, g2d);

dRenderer.setProperty(IDeviceRenderer.FILE_IDENTIFIER,

"output/DataRowEvaluator.png"); //$NON-NLS-1$

// dRenderer.setProperty(IDeviceRenderer.CACHED_IMAGE, img); //$NON-NLS-1$

Bounds bo = BoundsImpl.create(0, 0, 600, 600);

bo.scale(72d /

dRenderer.getDisplayServer().getDpiResolution());

// String[] set = { "Items", "Amounts" };//$NON-NLS-1$ //$NON-NLS-2$

String[] set = {

"Items" };//$NON-NLS-1$ //$NON-NLS-2$

// Object[][] data = { { "A", "B", "C" },

// { new Integer(7), new Integer(2), new Integer(5) } };

Object[][] data = { {

new Integer(7), new Integer(2), new Integer(5) } };

// Binds data to chart model

IDataRowExpressionEvaluator dree =

new DataRowExpressionEvaluator(set,

data);

try {

gr.bindData(dree, chart, new RunTimeContext());

gcs = gr.build(dServer, chart, bo, null, null, null);

gr.render(dRenderer, gcs);

ImageIO.write(img,

"png", new File("output/DataRowEvaluator.png"));

// System.out.println(img.getGraphics().toString());

// // O P E N

// ByteArrayOutputStream baos = new ByteArrayOutputStream( 1000 );

//

// try {

// // W R I T E

// ImageIO.write(img, "png", baos);

//

// // C L O S E

// baos.flush();

// this.iceImage = baos.toByteArray();

//

// baos.close();

//

// // System.out.println(getIceImage());

//

// } catch (IOException e) {

// e.printStackTrace();

// }

}

catch (ChartException e) {

e.printStackTrace();

}

catch (IOException e) {

e.printStackTrace();

}

}

/*

* (non-Javadoc)

*

* @see

* com.ibm.examples.chart.widget.chart.AbstractChartBuilder#createChart()

*/

protected void createChart() {

chart = ChartWithoutAxesImpl.create();

chart.setDimension( ChartDimension.TWO_DIMENSIONAL_WITH_DEPTH_LITERAL );

chart.setType("Pie Chart");

chart.setSubType("Standard Pie Chart");

}

/*

* (non-Javadoc)

*

* @see com.ibm.examples.chart.widget.AbstractChartBuilder#buildPlot()

*/

protected void buildPlot() {

chart.setSeriesThickness(25);

chart.getBlock().setBackground(ColorDefinitionImpl.WHITE());

Plot p =

chart.getPlot();

p.getClientArea().setBackground(

null);

p.getClientArea().getOutline().setVisible(

true);

p.getOutline().setVisible(

true);

}

/*

* (non-Javadoc)

*

* @see com.ibm.examples.chart.widget.AbstractChartBuilder#buildLegend()

*/

protected void buildLegend() {

Legend lg =

chart.getLegend();

lg.getText().getFont().setSize(16);

lg.getOutline().setVisible(

true);

}

/*

* (non-Javadoc)

*

* @see com.ibm.examples.chart.widget.AbstractChartBuilder#buildXSeries()

*/

protected void buildXSeries() {

// CREATE THE CATEGORY SERIES

Series seCategory = SeriesImpl.create();

TextDataSet categoryValues = TextDataSetImpl

.create(

new String[]{"A","B","C"});

seCategory.setDataSet(categoryValues);

// CREATE THE PRIMARY DATASET

PieSeries ls = (PieSeries) PieSeriesImpl.create();

ls.setSeriesIdentifier(

"My Pie Series");

ls.setSliceOutline(ColorDefinitionImpl.CREAM());

ls.getLabel().setVisible(

true);

seCategory.getDataDefinition().add(QueryImpl.create(

"G"));

SeriesDefinition sdX = SeriesDefinitionImpl.create();

sdX.getSeriesPalette().update(0);

// SET THE COLORS IN THE PALETTE

 

SeriesDefinition sdY = SeriesDefinitionImpl.create();

sdY.getSeriesPalette().update(1);

// SET THE COLORS IN THE PALETTE

sdY.setQuery(QueryImpl.create(

"Items"));

sdX.getSeriesDefinitions().add(sdY);

sdX.getSeries().add(seCategory);

sdY.getSeries().add(ls);

 

((ChartWithoutAxesImpl)

chart).getSeriesDefinitions().add(sdX);

// addSampleData(cwoaPie);

 

//

//

//

//

//

//

//// TextDataSet categoryValues = TextDataSetImpl

//// .create(new String[]{"A","B","C"});

//

// Series seCategory = SeriesImpl.create();

// // Base Series

//// Query xQ = QueryImpl.create( "Items" );//$NON-NLS-1$

//

//

//

//

// // Apply the color palette

// sdX = SeriesDefinitionImpl.create();

// ((ChartWithoutAxes)chart).getSeriesDefinitions().add(sdX);

//

// seCategory.getDataDefinition( ).add( xQ );

//

//// seCategory.setDataSet(categoryValues);

// seCategory.setSeriesIdentifier("Cities");

//

//

//// sdX.getSeriesPalette( ).shift( 0 );

// sdX.getSeries( ).add( seCategory );

//

//

//// sdX.getSeriesPalette().update(1);

 

}

/*

* (non-Javadoc)

*

* @see

* com.ibm.examples.chart.widget.chart.AbstractChartBuilder#buildYSeries()

*/

protected void buildYSeries() {

// NumberDataSet orthoValuesDataSet = NumberDataSetImpl.create(dataSet

// .getTechnitians());

// Orthogonal Series

Query qY = QueryImpl.create(

"Y" );//$NON-NLS-1$

PieSeries sePie = (PieSeries) PieSeriesImpl.create();

sePie.getDataDefinition( ).add( qY );

// sePie.setDataSet(orthoValuesDataSet);

// sePie.setSeriesIdentifier("Amounts");

SeriesDefinition sdY = SeriesDefinitionImpl.create();

sdX.getSeriesDefinitions().add(sdY);

sdY.getSeries().add(sePie);

}

}

 

****

 


import java.util.HashMap;
import java.util.Map;

import org.eclipse.birt.chart.factory.DataRowExpressionEvaluatorAdapter;

public class DataRowExpressionEvaluator extends
  DataRowExpressionEvaluatorAdapter {

 private int k = 0;
 private Object[] column;
 private Map map;

 public DataRowExpressionEvaluator(String[] set, Object[][] data) {
  if (set == null) {
   throw new IllegalArgumentException();
  }

  map = new HashMap();
  for (int i = 0; i < set.length; i++) {
   map.put(set[i], data[i]);
  }
 }

 /*
  * (non-Javadoc)
  *
  * @see
  * org.eclipse.birt.chart.factory.IDataRowExpressionEvaluator#evaluate(java
  * .lang.String)
  */
 public Object evaluate(String _expression_) {
  column = (Object[]) map.get(_expression_);
  return column[k];
 }

 /*
  * (non-Javadoc)
  *
  * @see org.eclipse.birt.chart.factory.IDataRowExpressionEvaluator#first()
  */
 public boolean first() {
  k = 0;

  if (map.size() > 0) {
   column = (Object[]) map.values().iterator().next();

   if (column != null && k < column.length) {
    return true;
   }
  }

  return false;
 }

 /*
  * (non-Javadoc)
  *
  * @see org.eclipse.birt.chart.factory.IDataRowExpressionEvaluator#next()
  */
 public boolean next() {
  if (column != null && k < (column.length - 1)) {
   k++;
   return true;
  }
  return false;
 }

 /*
  * (non-Javadoc)
  *
  * @see org.eclipse.birt.chart.factory.IDataRowExpressionEvaluator#close()
  */
 public void close() {
  // Doing nothing.
 }

}

*****

import

 java.awt.Graphics;

import

 java.awt.Graphics2D;

import

 java.awt.image.BufferedImage;

import

 java.io.ByteArrayOutputStream;

import

 java.io.File;

import

 java.io.IOException;

import

 javax.imageio.ImageIO;

import

 org.eclipse.birt.chart.api.ChartEngine;

import

 org.eclipse.birt.chart.device.IDeviceRenderer;

import

 org.eclipse.birt.chart.device.IDisplayServer;

import

 org.eclipse.birt.chart.exception.ChartException;

import

 org.eclipse.birt.chart.factory.GeneratedChartState;

import

 org.eclipse.birt.chart.factory.Generator;

import

 org.eclipse.birt.chart.factory.IDataRowExpressionEvaluator;

import

 org.eclipse.birt.chart.factory.IGenerator;

import

 org.eclipse.birt.chart.factory.RunTimeContext;

import

 org.eclipse.birt.chart.model.Chart;

import

 org.eclipse.birt.chart.model.attribute.Bounds;

import

 org.eclipse.birt.chart.model.attribute.impl.BoundsImpl;

import

 org.eclipse.birt.core.framework.PlatformConfig;

import

 com.ibm.icu.util.ULocale;

 

/**

* Provides the common members and the framework to build one chart.

*

* @author Qi Liang

*/

public

 abstract class AbstractChartBuilder {

protected byte[] iceImage;

/**

* The swing rendering device

*/

protected IDeviceRenderer dRenderer = null;

protected IDisplayServer dServer = null;

protected GeneratedChartState gcs = null;

protected IGenerator gr = null;

/**

* Font name for all titles, labels, and values.

*/

protected final static String FONT_NAME = "MS Sans Serif";

/**

* Provides data for chart.

*/

protected DataSet dataSet = null;

/**

* Chart instance.

*/

protected Chart chart = null;

/**

* Chart title.

*/

protected String title = null;

/**

* Constructs one chart builder and associate it to one data set.

*

* @param dataSet

* data set

*/

public AbstractChartBuilder(DataSet dataSet) {

this.dataSet = dataSet;

}

/**

* Builds one chart.

*/

public void build() {

createChart();

buildPlot();

buildLegend();

buildTitle();

buildXAxis();

buildYAxis();

buildXSeries();

buildYSeries();

}

 

public byte[] getIceImage() {

return iceImage;

}

/**

* Creates chart instance.

*/

protected abstract void createChart();

/**

* Builds plot.

*/

protected void buildPlot() {

}

/**

* Builds X axis.

*/

protected void buildXAxis() {

}

/**

* Builds Y axis.

*/

protected void buildYAxis() {

}

/**

* Builds X series.

*/

protected void buildXSeries() {

}

/**

* Builds Y series.

*/

protected void buildYSeries() {

}

/**

* Builds legend.

*

*/

protected void buildLegend() {

}

/**

* Builds the chart title.

*/

protected void buildTitle() {

chart.getTitle().getLabel().getCaption().setValue(title);

chart.getTitle().getLabel().getCaption().getFont().setSize(14);

chart.getTitle().getLabel().getCaption().getFont().setName(FONT_NAME);

}

/**

* Returns the chart instance.

*

* @return the chart instance

*/

public Chart getChart() {

return chart;

}

}