Dynamic Y-axis scale

Hello BIRT Experts, 
 
I am trying to adjust the y-axis of a report based on a report parameter. If the report parameter is greater than the default y-axis maximum, the y-axis maximum should be set to the parameter. Otherwise, the y-axis scale should keep its default formatting. 
 
I've made some progress with the following script (note that the y and x axes are inverted in this report): 
 
<pre class='_prettyXprint _lang-auto _linenums:0'>function beforeGeneration( chart, icsc )
{
// Force the y-axis scale to increase if load mark is greater than its default
yAxis1 = chart.primaryBaseAxes[0];
yScale1 = yAxis1.getScale();
if(icsc.externalContext.scriptable.getParameterValue("LoadMark") > yScale1.getMax())
{
yScale1.setMax(NumberDataElementImpl.create(icsc.externalContext.scriptable.getParameterValue("LoadMark")));
yAxis1.setScale(yScale1);
}
}</pre>
 
The problem I'm having is that yScale1.getMax() is returning nothing (I'm assuming it gets set later on in the chart rendering) and the y-scale ends up always being set to the report parameter. Which event function sets the y-axis min and max, and what would be the best way to work out this problem? 
 
Thanks for your help 
 
David

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Comments

suresh@anumolu

Thanks Clement Wong. I will give it a try.

hatra

Hey,
I am trying to use this script
beforeRendering: function(options, chart)

{

if (chart.getYAxisMax() < 1000000)

options.yAxis[0].labels.formatter = function() {

        return (this.value / 10000) + ' K';

};

else if (chart.getYAxisMax() > 1000000)

options.yAxis[0].labels.formatter = function() {

        return (this.value / 1000000) + ' M';

};

to modify a scale on a x - Axis to Min 1000000 and max 10,000,000 and also to show 000,000 as M
but it wont work for me, could anyone help for the script please ?
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