Using Plot, you should be able to make sure it's set to "current display", and what is on the screen will be plotted. As long as the scale is set to 1:1, it should plot that way.
thank you Dave, but I need to plot a selected area, which doesn't correspond to what I can get with the "current display" option (it often has a different ratio); I would like to set the printing area by dragging a rectangle. To my knowledge it is not possible, but maybe there is some advanced option that I don't know...
I appreciate that I'm a little behind in this conversation but the SDI BPS plotting solution allows you to plot a viewport while maintaining scale.
Do this with the Advanced Plot option to launch our interface and then the CGM Viewer - Right-Click the drawing to select the desired viewport:
WIth a viewport selected, you can plot just the data you're interested in.