For what you are trying to do, a better approach would be not to use the generated SVG but use the jBPM web designer to generate the PNG image of your process. The reason I say this is that the generated PNG image (which gets stored in your guvnor package by the way after generating it) has a 1-to-1 ratio to the designer canvas you generated it in. At this point, any x,y positioning in your process BPMNDI section will be valid in correspondance to the png image, an you do not have to manipulate it. Hope this helps.