How to set margins in millimeters?

Question

I have jasperDesign object with units mm, and I call method setMargins(myMargin) to change margins! the problem is with units, I want to setup in millimeters.

JasperDesign jasperDesign = JRXmlLoader.load(reportStream);
jasperDesign.setLeftMargin(newLeftMargin);
jasperDesign.setTopMargin(newTopMargin);
jasperDesign.setColumnWidth(newColumWidth);

Answer 1

Then its time to do some calculation

pixels = (mm * dpi) / 25.4;

The dpi (dot per inch) in jasper report is 72 .

public static int getPixels(float mm, int dpi){
    return Math.round((mm*dpi)/25.4f);
}