Center value label text in pie (donut) chart

Hi,
 
I'm trying to figure out if it's possible to center the label of one slice in a pie chart, no matter how big the slice is, so it produces something close to attached example.
At the moment I can see it's possible to offset the label but this is not the correct solution since it produces different results if the slice is smaller or bigger based on values.
 
Follow up question, is it possible to hide a slice label based on what category it belongs to?
 
Thanks in advance,
 
L

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Comments

DQM

hi,
you can add a short clientscript to your chart:
 
beforeGeneration: function(options, chart)
{
options.title.verticalAlign = 'middle';
},
 
<div>this works fine on shorter titles.</div>
<div>you can use a break tag in the title field of the chart itself when you'd like the title to run over multiple lines.</div>

Lynxfox

Are chart clientscripts a feature of Birt Pro only? I'm currently running the free version (4.5) and can't seem to find clientscripts for charts, only onRender which doesn't provide the "options" argument in it's beforeGeneration function.

DQM

you don't have a script tab in your chart options?
I attached a screenshot.
I'm running (free) Birt Designer Pro v4.4

Lynxfox

No, our charts are PNG/SVG only, since HTML5 is not an option in open source Birt.