Change Bar Chart Colour

nyoman

Dear All,

I am a beginner in BIRT programming.
I want to ask about how to change bar chart's colour dynamically,i make a report about historical montly sales report ,example :

Month,Group Product,Sales Amount
Jan'11,Group 1, 200000
Jan'11,Group 2, 300000
Jan'11,Group 3, 400000

And in every month all group product have sales amount, and i want to change the colour for group 1 = Red, group 2 = blue, group 3 = yellow.

what event should i override ? and is there any example ?

I have already success on PIE CHART, by override : beforeDrawDataPoint, and i do same code at my bar chart,and
it's nor working.

Thanks

JasonW

You should be able to do this with a script something like:

if( dph.getBaseDisplayValue() == "Group 1" ){
importPackage( Packages.org.eclipse.birt.chart.model.attribute.impl );
var mycolor = ColorDefinitionImpl.YELLOW();
r = mycolor.getRed();
g = mycolor.getGreen();
b = mycolor.getBlue();
fill.set(r, g, b );
}

You will most likely have to change the legend as well. Take a look at the attached example that changes the color of one bar based on a parameter.

Jason