saving origin to eps file

I am following the idea of tracing over an image on a new layer, then
saving the trace to a postscript file.

It works fine, but when I reset the origin to the center of my figure
(polylines forming a polygon), then that information is lost when I save to
eps.  e.g. points that show in ipe as being in any one of the 4 quadrants
of the coordinate system (like (-10,-10) or (-5.5)) all get changed to
positive values in the saved eps file.

Is there a way to preserve that change to origin in postscript?  Or does
postscript only allow for the origin being in the lower left corner?

On Tue, Nov 24, 2015 at 1:13 AM, Fabien Lafont <[email protected]>
wrote:

> Hello,
>
> I managed to create a gradient using the online documentation but is it
> possible to create such gradient for a line or a spline?
>
> Fabien
>
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