obtain current position for BoundingBox

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2 total messages Started by Daniel_Barna Fri, 13 Mar 2009 11:34

#50

Author: Daniel_Barna
Date: Fri, 13 Mar 2009 11:34

15 lines
1394 bytes

Hi,
the bbox device of ghostscript is said to be incorrect (by the manual of ps2eps - Linux), and I also experience this: it prints incorrect bounding boxes. So I would like to implement an automatic method to obtain the correct bounding box, by
1) making a block in the postscript file that I generate, like this:
/CalculateBBox where {
lower_left_x lower_left_y moveto
currentpoint = =
upper_right_x upper_right_y moveto
currentpoint = = } if
2) running gs by defining CalculateBBox: gs -dCalculateBBox myfile.ps;
and grepping the numbers from the output

The problem is, that currentpoint seems to return the current position in a local coordinate system (for example if my eps file is included in a latex document, and I want to obtain the bounding box of this final document, it fails).
Does anybody know how to do this?

Thanks

Re: obtain current position for BoundingBox

#201

Author: Helge Blischke
Date: Sat, 14 Mar 2009 14:11

30 lines
1978 bytes

Daniel_Barna@adobeforums.com wrote:

> Hi,
> the bbox device of ghostscript is said to be incorrect (by the manual of
> ps2eps - Linux), and I also experience this: it prints incorrect bounding
> boxes. So I would like to implement an automatic method to obtain the
> correct bounding box, by 1) making a block in the postscript file that I
> generate, like this: /CalculateBBox where { lower_left_x lower_left_y
> moveto currentpoint = = upper_right_x upper_right_y moveto
> currentpoint = = } if
> 2) running gs by defining CalculateBBox: gs -dCalculateBBox myfile.ps;
> and grepping the numbers from the output
> 
> The problem is, that currentpoint seems to return the current position in
> a local coordinate system (for example if my eps file is included in a
> latex document, and I want to obtain the bounding box of this final
> document, it fails). Does anybody know how to do this?
> 
> Thanks

bracket your BBox computaions with

	gsave
	matrix defaultmatrix setmatrix
	% your stuff here
	grestore

in order to get your coordinates in the default coordinate system.

Helge

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