how to set the position of a label to avoid overlapping

<p>Hi ,</p>
<p> </p>
<p>i m trying to find a solution to improve the display of a pie chart having an overlapping problem</p>
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mwilliams

Unfortunately, that's the only way I see to change the position of the individual label. If I come up with something different, I'll let you know.

mwilliams

You could log a bug for this in the bugzilla. You can find the bugzilla at eclipse.org/birt, in the community section.

somnix

<p>Thanks Michael,</p>
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<p>i find it real weird that it s not possible to set the position more easily, they should have think about overlapping situation .</p>
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<p>i read many post about the possibility to override some rendering function or my own event handler.</p>
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<p>do u think that it could be a way to do , By passing the calculation of the position . (i even don't know if it s possible )</p>
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<p>Just a small question for you because i dont really understand it . </p>
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<p>It seems that event hanlder can be written in javascript or java , is it also possible to write java code in the Script Editor in Exlipse</p>
<p>or the java class have to be created in other place .</p>
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<p>maybe you have a good link to propose me to find documentation for this .</p>
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<p>:)</p>
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<p>thanks a lot for your help</p>
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<p>Ludo</p>

mwilliams

You can write a Java Event Handler for you chart or use the script area.<br><br>Here is a link to documentation on the plotComputation stuff:<br><br><a data-ipb='nomediaparse' href='http://help.eclipse.org/luna/index.jsp?topic=/org.eclipse.birt.chart.doc.isv/chart/api/org/eclipse/birt/chart/computation/PlotComputation.html'>http://help.eclipse.org/luna/index.jsp?topic=/org.eclipse.birt.chart.doc.isv/chart/api/org/eclipse/birt/chart/computation/PlotComputation.html</a><br><br>You might be able to use this in the beforeRender or afterGeneration to change the computation of the label. I don't have time to dig into it, right now, but if you find something, let me know!

somnix

<p>Hi Michael,</p>
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<p>finally , i found a way to put the label more far from the center to avoid the overlapping.</p>
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<p>this is a solution only if the background is transparent.</p>
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<div>[sharedmedia=core:attachments:12505]</div>
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<div>and here is the code, maybe it can help someone .</div>
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<div>in my case the label is containing only the percent value .</div>
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<div>coeff > 0 ---> more far from the center.</div>
<div>coeff < 0 ---> closer to the center.</div>
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<div>
<pre class="_prettyXprint _lang-js">
total = 0;

function beforeDrawDataPointLabel( dph, label, icsc )
{
importPackage(Packages.org.eclipse.birt.chart.model.attribute.impl);

current = 0;

val = parseInt(label.getCaption().getValue().replace('%', ''));

current = total + val/2
total = total + val;

mx = Math.round( 1000 * Math.cos( Math.PI*( current*3.6 )/180) ) /1000;
my = Math.round( 1000 * Math.sin( Math.PI*( current*3.6 )/180) ) /1000;

coeff = 30;

if (my >=0)
label.getInsets().setBottom(my * coeff);
else
label.getInsets().setTop(-my * coeff);

alignment = label.getCaption().getFont().getAlignment();

if (mx >=0) {
label.getInsets().setLeft(mx * coeff);
alignment.setHorizontalAlignment(org.eclipse.birt.chart.model.attribute.HorizontalAlignment.getByName("Left"));
}
else {
label.getInsets().setRight(-mx * coeff);
alignment.setHorizontalAlignment(org.eclipse.birt.chart.model.attribute.HorizontalAlignment.getByName("Right"));
}
}
</pre>
</div>
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