Set background Color from a parameter

[adry]

Hello ,

i want to set the background color of a rectangle with a value sent as a parameter, Can anybody help ?

[niik]

This is a solution to change a style attribute after the call to

Code:

jasperPrint = JasperFillManager.fillReport(rptfile, parameters, dataSource);

 

1. In ireports define a style that contains a default background color. Apply this style to the rectangle(s).

 

2. After calling fillReport(), find the style and change its background color attribute:

Code:

[code] if (hexVal != null && !"".equals(hexVal)) { Color userColor = new Color(R, G, B ); JRStyle[] styleList = jasperPrint.getStyles(); for (int j = 0; j < styleList.length; j++) { System.out.println("style " + j + " is " + styleList[j].getName()); if (styleList[j].getName().equals("tableHeader"«»)) { System.out.println("found tableHeader"«»); styleList[j].setBackcolor(userColor); jasperPrint.addStyle(styleList[j], true); } } }

 

3. Export your report.

Post edited by: niik, at: 2007/08/28 15:52

[teodord]

Hi,

 

If it is about a parameter, then it means you know the color even before filling the report and the rectangle will have the same color no matter how many times it gets rendered in the report.

If so, then you could try "alter" the rectangle's color by making modifications on the compiled report template at runtime, as shown in the /demo/samples/alterdesign sample provided with the project.

 

But if you are actually looking for a solution to change the color of the rectangle with every record (dependent on a field or variable, not only parameter), then this is not possible. If the number of different colors is limited, then a conditional style could be used to make the rectangle color change based on runtime conditions.

 

I hope this helps.

Teodor

[adry]

Hi,

Where i can find the sample you mentioned (/demo/samples/alterdesign) ?

Can you provide a link ?

[lucianc]

Read this topic to see where to get the JR samples from.

 

HTH,

Lucian

[newsletter6]

But if you are actually looking for a solution to change the color of the rectangle with every record (dependent on a field or variable, not only parameter), then this is not possible. If the number of different colors is limited, then a conditional style could be used to make the rectangle color change based on runtime conditions.

It is possible, with a trick: I generate 1x1 Pixel images and put those into my DataSource, as Colors are not supported directly. Then I create an image field in iReport and let JasperReports fill it from the image I generated from the color information.

 

This works for me:

 

Code:

BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB«»);
img.setRGB(0, 0, color.getRGB());

 

Regards,

Mathis

[pilabrem]

You can do that with net.sf.jasperreports.style.* element level properties (for which you can have expressions as values).

In your case you would need

 

 

 

<rectangle>

    <reportElement ...>

        <propertyExpression name="net.sf.jasperreports.style.backcolor">$P{someColor}</propertyExpression>

        ...
   </reportElement>
   ...

</rectangle>

[pilabrem]

You can do that with net.sf.jasperreports.style.* element level properties (for which you can have expressions as values).

In your case you would need

 

<rectangle>    <reportElement ...>        <propertyExpression name="net.sf.jasperreports.style.backcolor">$P{someColor}<propertyExpression>        ...    <reportElement></rectangle>[/code]