Runtime Control of Y-axis Labels in Chart

jeffreymac · 2007 01

I would like to be able to control the format of the y-axis labels depending on the maximum y value of the data to be displayed. Is this possible and if so, what evnet handler do I need to use and how to I obtain the max value within the event handler?

Virgil · 2007 06

Hi jeffreymac,

There are a couple of event handlers needed to get at the values, and format the axis label. Below is a javascript example that may work for you. This one will color the label corresponding to the largest data value.

var maxval=0;
var dataSetProcessor;

function beforeDataSetFilled(series, idsp, icsc) {
dataSetProcessor = idsp;
}

function afterDataSetFilled(series, dataSet, icsc) {
maxval = dataSetProcessor.getMaximum( dataSet );
}

function beforeDrawAxisLabel(axis, label, icsc)
{
importPackage(Packages.org.eclipse.birt.chart.model.attribute);
importPackage(Packages.org.eclipse.birt.chart.model);
importPackage(Packages.org.eclipse.birt.chart.model.data);
importPackage(Packages.org.eclipse.birt.chart.model.data.impl);

if (maxval <= parseFloat(label.getCaption().getValue())) {
if (axis.getType() != AxisType.TEXT_LITERAL) {
label.getCaption().getColor( ).set( 208, 32, 0);
}
}
}

jeffreymac · 2007 07

Thanks very much for the fast response and help! The code you provided worked fine. For some reason I had to remove the import statements to prevent errors.

Runtime Control of Y-axis Labels in Chart

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