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how to render charts to stream or object (png, svg) [message #909496] Fri, 07 September 2012 08:40 Go to next message
moritz du is currently offline moritz duFriend
Messages: 98
Registered: February 2010
Member
i am able to render my charts to different file types:
 dRenderer = ce.getRenderer("dv.SVG");//or dv.PNG
 dRenderer.setProperty(IDeviceRenderer.FILE_IDENTIFIER, path);


but how to get the binary data as a stream? the charts will most likely be end in some one's browser. so a file on disk i relativly useless.

(it would be stupid to save many charts on disk before reading them again)

[Updated on: Fri, 07 September 2012 14:18]

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Re: how to render charts to stream (png, svg) [message #909597 is a reply to message #909496] Fri, 07 September 2012 11:47 Go to previous messageGo to next message
moritz du is currently offline moritz duFriend
Messages: 98
Registered: February 2010
Member
in meantime i got a solution for png here: http://stackoverflow.com/questions/12314777/how-to-render-a-birt-chart-to-a-stream-png-svg

but how to get an svg stored in an object (probably String)?
Re: how to render charts to stream (png, svg) [message #909746 is a reply to message #909597] Fri, 07 September 2012 17:35 Go to previous messageGo to next message
Jason Weathersby is currently offline Jason WeathersbyFriend
Messages: 9167
Registered: July 2009
Senior Member

I posted a reply to the stackoverflow question. Here is the complete example:

package org.eclipse.chart.birt.servlet.example;



import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;

import javax.imageio.ImageIO;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.eclipse.birt.chart.api.ChartEngine;
import org.eclipse.birt.chart.device.EmptyUpdateNotifier;
import org.eclipse.birt.chart.device.IDeviceRenderer;
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.IGenerator;
import org.eclipse.birt.chart.factory.RunTimeContext;
import org.eclipse.birt.chart.model.Chart;
import org.eclipse.birt.chart.model.ChartWithAxes;
import org.eclipse.birt.chart.model.attribute.ActionType;
import org.eclipse.birt.chart.model.attribute.AxisType;
import org.eclipse.birt.chart.model.attribute.Bounds;
import org.eclipse.birt.chart.model.attribute.IntersectionType;
import org.eclipse.birt.chart.model.attribute.LegendItemType;
import org.eclipse.birt.chart.model.attribute.Position;
import org.eclipse.birt.chart.model.attribute.TickStyle;
import org.eclipse.birt.chart.model.attribute.TriggerCondition;
import org.eclipse.birt.chart.model.attribute.impl.BoundsImpl;
import org.eclipse.birt.chart.model.attribute.impl.ColorDefinitionImpl;
import org.eclipse.birt.chart.model.attribute.impl.TooltipValueImpl;
import org.eclipse.birt.chart.model.attribute.impl.URLValueImpl;
import org.eclipse.birt.chart.model.component.Axis;
import org.eclipse.birt.chart.model.component.Series;
import org.eclipse.birt.chart.model.component.impl.SeriesImpl;
import org.eclipse.birt.chart.model.data.BaseSampleData;
import org.eclipse.birt.chart.model.data.DataFactory;
import org.eclipse.birt.chart.model.data.NumberDataSet;
import org.eclipse.birt.chart.model.data.OrthogonalSampleData;
import org.eclipse.birt.chart.model.data.SampleData;
import org.eclipse.birt.chart.model.data.SeriesDefinition;
import org.eclipse.birt.chart.model.data.TextDataSet;
import org.eclipse.birt.chart.model.data.Trigger;
import org.eclipse.birt.chart.model.data.impl.ActionImpl;
import org.eclipse.birt.chart.model.data.impl.NumberDataSetImpl;
import org.eclipse.birt.chart.model.data.impl.SeriesDefinitionImpl;
import org.eclipse.birt.chart.model.data.impl.TextDataSetImpl;
import org.eclipse.birt.chart.model.data.impl.TriggerImpl;
import org.eclipse.birt.chart.model.impl.ChartWithAxesImpl;
import org.eclipse.birt.chart.model.layout.Legend;
import org.eclipse.birt.chart.model.layout.Plot;
import org.eclipse.birt.chart.model.type.BarSeries;
import org.eclipse.birt.chart.model.type.impl.BarSeriesImpl;
import org.eclipse.birt.core.framework.PlatformConfig;

import com.ibm.icu.util.ULocale;


/**
* Servlet implementation class DynamicContentCreation
*/

public class ChartServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

private IDeviceRenderer idr = null;

private ChartEngine ce = null;

private Chart chart = null;

public ChartServlet( )
{

PlatformConfig pf = new PlatformConfig();
pf.setProperty("STANDALONE", true);
ce = ChartEngine.instance( pf);

try
{
//idr = ce.getRenderer( "dv.SWING" );
idr = ce.getRenderer( "dv.SVG" );

}
catch ( ChartException ex )
{
ex.printStackTrace( );
}

}


public void init() throws ServletException {


}

public void destroy() {
super.destroy();
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {


chart = ChartServlet.createStackedBar();


// Set the Content-Type header for the image output
response.setHeader( "Cache-Control", "no-store" ); //$NON-NLS-1$//$NON-NLS-2$
response.setDateHeader( "Expires", 0 ); //$NON-NLS-1$
//response.setContentType( "image/png" );
response.setContentType( "image/svg+xml" );

try {

// Render
//createImage((OutputStream) response.getOutputStream());
//SVG
createSVGImage((OutputStream) response.getOutputStream());

} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}


}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
super.doPost(request, response);
}
private void createImage( OutputStream out )
{

// Create a buffered image
BufferedImage image = new BufferedImage( 600,
400,
BufferedImage.TYPE_INT_RGB );

// Draw the chart in the buffered image
Graphics2D g2d = (Graphics2D) image.getGraphics( );
idr.setProperty( IDeviceRenderer.GRAPHICS_CONTEXT, g2d );

Bounds bo = BoundsImpl.create( 0, 0, 600, 400 );
// convert pixels to points (1 inch = 72 points = dpi pixels )
// 1 pixel = 72/dpi points
bo.scale( 72d / idr.getDisplayServer( ).getDpiResolution( ) );

IGenerator gr = ce.getGenerator();

try
{
GeneratedChartState gcs =
gr.build( idr.getDisplayServer( ),
chart,
bo,
null,
null,
null );

gr.render( idr, gcs ); // Style processor
}
catch ( ChartException ex )
{
ex.printStackTrace( );
}

g2d.dispose( );

// Output the image
try
{
ImageIO.write( image, "PNG", out ); //$NON-NLS-1$
}
catch ( IOException io )
{
io.printStackTrace( );
}

}

private void createSVGImage( OutputStream out )
{

try
{
RunTimeContext rtc = new RunTimeContext( );
rtc.setULocale( ULocale.getDefault( ) );

Generator gr = Generator.instance( );
GeneratedChartState gcs = null;
Bounds bo = BoundsImpl.create( 0, 0, 600, 400 );
gcs = gr.build( idr.getDisplayServer( ), chart, bo, null, rtc, null );

idr.setProperty( IDeviceRenderer.FILE_IDENTIFIER, out );
idr.setProperty(
IDeviceRenderer.UPDATE_NOTIFIER,
new EmptyUpdateNotifier( chart, gcs.getChartModel( ) ) );

gr.render( idr, gcs );
}
catch ( ChartException io )
{
io.printStackTrace( );
}

}

public static final Chart createStackedBar()

{

ChartWithAxes cwaBar = ChartWithAxesImpl.create();

cwaBar.setType("Bar Chart"); //$NON-NLS-1$

cwaBar.setSubType("Stacked"); //$NON-NLS-1$

// Plot

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

cwaBar.getBlock().getOutline().setVisible(true);

Plot p = cwaBar.getPlot();

p.getClientArea().setBackground(ColorDefinitionImpl.create(255,

255,

225));

// Title

cwaBar.getTitle()

.getLabel()

.getCaption()

.setValue("Stacked Bar Chart"); //$NON-NLS-1$

// Legend

Legend lg = cwaBar.getLegend();


lg.setItemType(LegendItemType.CATEGORIES_LITERAL);

//Add Script

cwaBar
.setScript("function beforeGeneration( cm, icsc )"
+ "{importPackage(Packages.org.eclipse.birt.chart.model.attribute); "
+ " importPackage(Packages.org.eclipse.birt.chart.model.attribute.impl); "
+ " cm.getLegend().getOutline( ).setStyle( LineStyle.DASH_DOTTED_LITERAL );"
+ " cm.getLegend().getOutline( ).setColor( ColorDefinitionImpl.GREEN() );"
+ " cm.getLegend().getOutline( ).setVisible( true );} ");

// X-Axis

Axis xAxisPrimary = cwaBar.getPrimaryBaseAxes()[0];

xAxisPrimary.setType(AxisType.TEXT_LITERAL);


xAxisPrimary.getMajorGrid().setTickStyle(TickStyle.BELOW_LITERAL);

xAxisPrimary.getOrigin().setType(IntersectionType.MIN_LITERAL);

// Y-Axis

Axis yAxisPrimary = cwaBar.getPrimaryOrthogonalAxis(xAxisPrimary);

yAxisPrimary.getMajorGrid().setTickStyle(TickStyle.LEFT_LITERAL);

yAxisPrimary.setType(AxisType.LINEAR_LITERAL);

yAxisPrimary.setLabelPosition(Position.RIGHT_LITERAL);
yAxisPrimary.getLabel().getCaption().getFont().setRotation(45);



// Data Set

TextDataSet categoryValues = TextDataSetImpl.create(new String[] {
"Item 1a", "Item 2", "Item 3", "Item 4", "Item 5" }); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$

NumberDataSet orthoValues1 = NumberDataSetImpl.create(new double[] {

25, 35, 15, 5, 20

});

NumberDataSet orthoValues2 = NumberDataSetImpl.create(new double[] {

5, 10, 25, 10, 5

});

SampleData sd = DataFactory.eINSTANCE.createSampleData();

BaseSampleData sdBase = DataFactory.eINSTANCE.createBaseSampleData();

sdBase.setDataSetRepresentation("");//$NON-NLS-1$

sd.getBaseSampleData().add(sdBase);

OrthogonalSampleData sdOrthogonal1 = DataFactory.eINSTANCE
.createOrthogonalSampleData();

sdOrthogonal1.setDataSetRepresentation("");//$NON-NLS-1$

sdOrthogonal1.setSeriesDefinitionIndex(0);

sd.getOrthogonalSampleData().add(sdOrthogonal1);

OrthogonalSampleData sdOrthogonal2 = DataFactory.eINSTANCE
.createOrthogonalSampleData();

sdOrthogonal2.setDataSetRepresentation("");//$NON-NLS-1$

sdOrthogonal2.setSeriesDefinitionIndex(1);

sd.getOrthogonalSampleData().add(sdOrthogonal2);

cwaBar.setSampleData(sd);

// X-Series

Series seCategory = SeriesImpl.create();

seCategory.setDataSet(categoryValues);

SeriesDefinition sdX = SeriesDefinitionImpl.create();

xAxisPrimary.getSeriesDefinitions().add(sdX);

sdX.getSeries().add(seCategory);
sdX.getSeriesPalette().shift(0);

// Y-Series

BarSeries bs1 = (BarSeries) BarSeriesImpl.create();

bs1.setDataSet(orthoValues1);

bs1.setStacked(true);

bs1.getLabel().setVisible(true);

bs1.setLabelPosition(Position.INSIDE_LITERAL);
bs1.setRiserOutline(ColorDefinitionImpl.TRANSPARENT());

BarSeries bs2 = (BarSeries) BarSeriesImpl.create();

bs2.setDataSet(orthoValues2);

bs2.setStacked(true);

bs2.setRiserOutline(ColorDefinitionImpl.TRANSPARENT());
bs2.getLabel().setVisible(true);

bs2.setLabelPosition(Position.INSIDE_LITERAL);


Trigger tr2 = TriggerImpl.create(TriggerCondition.ONCLICK_LITERAL,
ActionImpl.create(ActionType.URL_REDIRECT_LITERAL, URLValueImpl
.create("https://www.google.com", null, "component",
"value", "")));

bs1.getTriggers().add(tr2);

//bs2.getTriggers().add(tr3);
//bs2.getTriggers().add(tr4);

SeriesDefinition sdY = SeriesDefinitionImpl.create();

sdY.getSeriesPalette().shift(0);

yAxisPrimary.getSeriesDefinitions().add(sdY);

sdY.getSeries().add(bs1);

sdY.getSeries().add(bs2);

return cwaBar;

}
}

Jason
Re: how to render charts to stream (png, svg) [message #909748 is a reply to message #909746] Fri, 07 September 2012 17:39 Go to previous messageGo to next message
Jason Weathersby is currently offline Jason WeathersbyFriend
Messages: 9167
Registered: July 2009
Senior Member

You may also want to look over this older example:
http://www.birt-exchange.org/org/devshare/deploying-birt-reports/1026-calling-the-chart-engine-from-a-servlet/

Jason
Re: how to render charts to stream (png, svg) [message #910665 is a reply to message #909748] Mon, 10 September 2012 07:18 Go to previous messageGo to next message
moritz du is currently offline moritz duFriend
Messages: 98
Registered: February 2010
Member
Thx
the whole weekend i was concerned about this problem. the solution is much simpler then i thought: simply give the "file identifier" a outputstream. Probably this should be included in javadoc.
Is there a reason why to render the png differently? i just tried to render the png the same way - giving an outputstream as file identifier and set "dv.PNG" - the rest of code is exactly the same.
Re: how to render charts to stream (png, svg) [message #910960 is a reply to message #910665] Mon, 10 September 2012 17:56 Go to previous messageGo to next message
Jason Weathersby is currently offline Jason WeathersbyFriend
Messages: 9167
Registered: July 2009
Senior Member

Yes you can change the renderer, like

idr = ce.getRenderer( "dv.PNG" );
//idr = ce.getRenderer( "dv.SVG" );

Make sure to change the mime type as well.
response.setContentType( "image/png" );
//response.setContentType( "image/svg+xml" );

Yes it would be good to have this in the faq and the JavaDocs. Can you open a bugzilla entry for this?
Another thing that would be nice is to change the setting from a file identifier to an output stream indentifier, which is technically what it is.

Jason
Re: how to render charts to stream (png, svg) [message #911270 is a reply to message #910960] Tue, 11 September 2012 09:17 Go to previous messageGo to next message
moritz du is currently offline moritz duFriend
Messages: 98
Registered: February 2010
Member
filed a bug

thx for your help jason
Re: how to render charts to stream (png, svg) [message #911409 is a reply to message #911270] Tue, 11 September 2012 14:38 Go to previous message
Jason Weathersby is currently offline Jason WeathersbyFriend
Messages: 9167
Registered: July 2009
Senior Member

Thanks for posting the bug.

Jason
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