mp1w+@ANDREW.CMU.EDU (Marc Russell Pawliger) (03/13/88)
In the documents from Adobe about ESPF they say that the %%BoundingBox must be
included in the prolog. Do the lower-left and upper-right coordinates in the
comment refer to absoulte bounding coordinates, or are they `relocatable'?
If I have a 2" x 3" graphic, can I give the coordinates as (0,0) and (600,900)
[assuming 300 dpi], or do I have to give the coordinates where the graphic will
actually be drawn? All the code for the graphic is relative-offset from the
current point anyway...
Thanks,
Marcted@mitre-bedford.ARPA (Edward J. Ede) (03/14/88)
In article <AWCMg=y00hcqQ99lNJ@andrew.cmu.edu> mp1w+@ANDREW.CMU.EDU (Marc Russell Pawliger) writes: >In the documents from Adobe about ESPF they say that the %%BoundingBox must be >included in the prolog. Do the lower-left and upper-right coordinates in the >comment refer to absoulte bounding coordinates, or are they `relocatable'? They are not relocatable. > >If I have a 2" x 3" graphic, can I give the coordinates as (0,0) and (600,900) >[assuming 300 dpi], or do I have to give the coordinates where the graphic will Think device independence.... Use points, not pixels. >actually be drawn? All the code for the graphic is relative-offset from the >current point anyway... > The graphic should be placed at an absolute location. With it fixed in place the %%BoundingBox comment accurately describes its position and size. If you then want to include this image into another image, you can use the BoundingBox info to do the appropriate translate, scale, and rotate. These three operators are all that you need to get the included image in the right spot with the proper size and orientation. Its generally a good idea to put a save and restore around the image. A clip region may also come in handy. Ted Ede -- ted@mitre-bedford.arpa -- The MITRE Corporation -- Burlington Road | -- Bedford MA, 01730 -- Mail Stop B015 -- (617) 271-2524 -- | | - this line intentionally left blank - | +---------------------------------------------------------------------------+
barnett@vdsvax.steinmetz.ge.com (Bruce G. Barnett) (03/14/88)
If you are calculating bounding boxes, you may wish to get BBfig - originally written by Ned Batchelder and posted to comp.text and net.sources in April 87. You print out your PostScript diagram using bbfig, and the printer calculates the bounding box. Or I can send you a copy. -- Bruce G. Barnett <barnett@ge-crd.ARPA> <barnett@steinmetz.UUCP> uunet!steinmetz!barnett
liam@cs.qmc.ac.uk (William Roberts) (03/16/88)
Sender: Followup-To: Distribution: In article <AWCMg=y00hcqQ99lNJ@andrew.cmu.edu> mp1w+@ANDREW.CMU.EDU (Marc Russell Pawliger) writes: >In the documents from Adobe about ESPF they say that the %%BoundingBox must be >included in the prolog. Do the lower-left and upper-right coordinates in the >comment refer to absoulte bounding coordinates, or are they `relocatable'? The answer is that they are absolute and given in points. The idea is that you are declaring where on the page your program will make black or white marks, assuming it is sent to a standard PostScript printer. >If I have a 2" x 3" graphic, can I give the coordinates as (0,0) and (600,900) >[assuming 300 dpi], or do I have to give the coordinates where the graphic will >actually be drawn? All the code for the graphic is relative-offset from the >current point anyway... You give the bounding box as %%BoundingBox: 0 0 144 216 because that is where is will actually be drawn. The bounding box is very useful if you can provide it; the psfig software uses it to work out the necessary coordinate transformation to place the graphic in the desired point in a troff document, and to scale it etc as instructed. WARNING: if your code puts the graphic in different places according to such things as the page type, the value of the /Product string in statusdict (blech!) or even the current clipping path, then you can't reasonably put any bounding box at all! Take this as a hint about the portability of your code.... -- William Roberts ARPA: liam@cs.qmc.ac.uk (gw: cs.ucl.edu) Queen Mary College UUCP: liam@qmc-cs.UUCP LONDON, UK Tel: 01-980 4811 ext 3933