Set Size Unit for the Barcode Image

To change a barcode image’s measuring unit, use the BarCodeAttributes setGraphicsUnit() method. The setGraphicsUnit() method accepts any value defined in the GraphicsUnit class.

Setting Image Size

The measuring units defined in the GraphicsUnit enumeration are as follows.

Measuring Units	Description
Display	Specifies 1/75 inch as the unit of measure.
Document	Specifies the document unit (1/300 inch) as the unit of measure.
Inch	Specifies the inch as the unit of measure.
Millimeter	Specifies the millimeter as the unit of measure.
Pixel	Supported by the .NET Compact Framework. Specifies a device pixel as the unit of measure.
Point	Specifies a printer’s point (1/72 inch) as the unit of measure.
The default size measurement unit is millimeter.

The output barcode image generated by the code sample in this article is shown below.

Barcode with customized bar height in points

Programming Sample

The example below changes the bar height of the barcode; the measuring unit used for the bar height is point.

Java

 public class MyAttributes

{

  public static BarCodeAttributes Create(String text, String symbology)

  {

    BarCodeAttributes b = new BarCodeAttributes();

    b.setCodeText(text);

    b.setSymbology(symbology);

    //Measurement is Milimeter

    b.setGraphicsUnit(GraphicsUnit.POINT);

    return b;

  }

}

JRXML

 <image hAlign="Center">

<reportElement x="0" y="600" width="500" height="250" />

<imageExpression class="net.sf.jasperreports.engine.JRRenderable">

  <![CDATA[new com.aspose.barcode.jr.BarCodeRenderer(MyAttributes.Create(

   "12345678", "Code128")

  )]]>

</imageExpression>

</image>