line chart help me

I want to create a line chart like that when the line's axis(X) is over a certain value the color of the line will be changed.(like the attachment) 
I want to use the javascript in the BIRT report designer,But up to now I have never use of the Line Chart javascript API. 
How can do it, teach me please!thanks very much! 
 
E_mail:wangchen188996@163.com 
MSN : <a href='mailto:' title='E-mail Link' class='bbc_email'>wang188996@hotmail.com</a> 
 
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madhu_2009

Hi..

Add a marker on X- Axis and add this code in the script tab (on render)of your line chart.
Here in the below code my marker value is 4. so if the line crosses 4 the color is red,else in green. hope this helps u..

function beforeDrawDataPoint(dataPointHints, fill, scriptContext ){
val = dataPointHints.getOrthogonalValue();
chart = scriptContext.getChartInstance();
marker = 4//chart.getAxes().get(0).getAssociatedAxes().get(0).getMarkerLines().get(0).getValue().getValue();
if (val > marker) //crosses marker?
fill.set(0,255,0); //yes - display in red
else
fill.set(254, 102, 0); //no - display in blue
}

regards,
Madhu

wangchen

<blockquote class='ipsBlockquote' data-author="madhu_2009">Hi.. 
 
Add a marker on X- Axis and add this code in the script tab (on render)of your line chart. 
Here in the below code my marker value is 4. so if the line crosses 4 the color is red,else in green. hope this helps u.. 
 
function beforeDrawDataPoint(dataPointHints, fill, scriptContext ){ 
val = dataPointHints.getOrthogonalValue(); 
chart = scriptContext.getChartInstance(); 
marker = 4//chart.getAxes().get(0).getAssociatedAxes().get(0).getMarkerLines().get(0).getValue().getValue(); 
if (val > marker) //crosses marker? 
fill.set(0,255,0); //yes - display in red 
else 
fill.set(254, 102, 0); //no - display in blue 
} 
 
regards, 
Madhu</blockquote>
 
Hi 
 
thank you very much. 
 
Can you tell me how to change the color of the curve?which function is used to change che curve line? 
 
I have done as you told me, The color of the marker changed,but the color of the line didn't change. 
 
I'm a beginner of BIRT.The color of the curve is important, Help me please! 
 
thanks !

madhu_2009

Hey..
This is what i have used for a bar chart,in which the bars crossing the marker limit ultimatley changes the color. Similarly there might be a way to change the color of the line.
I will let you know if i come across that..
Rgds,
Madhu