clewis@ferret.ocunix.on.ca (Chris Lewis) (03/07/91)
How do you get Display Postscript to pause long enough so you can look at what it's drawn? I have DPS on a RS/6000, and I can run my psroff (cat troff -2- postscript) piped into a program called "dpsexec" (one of the DPS example programs - seems to be some sort of frontend for the VM and comes with source), and see the output. Unfortunately, it won't pause at the end of a page, and when it hits the end of the file it simply erases the window... So I have to read real fast.... Any idears? If it requires a change to the Postscript, does anybody have a way for the postscript to tell by itself when run under DPS, so that it automatically knows when to do the right thing? thanks -- Chris Lewis, clewis@ferret.ocunix.on.ca or ...uunet!mitel!cunews!latour!ecicrl!clewis
asente@adobe.com (Paul Asente) (03/09/91)
In article <1991Mar07.143231.8470@ferret.ocunix.on.ca> clewis@ferret.ocunix.on.ca.UUCP (Chris Lewis) writes: >How do you get Display Postscript to pause long enough so you can >look at what it's drawn? I have DPS on a RS/6000, and I can run >my psroff (cat troff -2- postscript) piped into a program called >"dpsexec" (one of the DPS example programs - seems to be some sort >of frontend for the VM and comes with source), and see the output. > >Unfortunately, it won't pause at the end of a page, and when it hits >the end of the file it simply erases the window... So I have to >read real fast.... The showpage operator has several parts; it prints out the current page, erases the page, and resets some internal state. In DPS, since it images immediately, the "prints out the current page" part is really a no-op. (I suspect you knew this already.) What you have to do if you want to use dpsexec to preview a file is to redefine showpage before reading the file. The basic idea is to define showpage to be a procedure that opens stdin for reading, reads a line from it, then executes the original showpage operator. This will make the execution pause at the end of each page until you hit return. If you don't know how to write PostScript code to redefine showpage, just ask, and I'll get all the details. I don't have the manual here at home with me so I'd almost certainly make some mistakes if I tried to write real code for you. -paul asente asente@adobe.com ...decwrl!adobe!asente Ratz put a bucket of liquid in front of me. "I wanted a glass of docs, Ratz. What the hell is this?" I barked. "Motif don't fit in a glass anymore," he barked back. I looked at the liquid. It was totally opaque to me.
rsmith@well.sf.ca.us (Ross Smith) (03/11/91)
clewis@ferret.ocunix.on.ca (Chris Lewis) writes: >How do you get Display Postscript to pause long enough so you can >look at what it's drawn? I have DPS on a RS/6000, and I can run Try sending this before the file: /sleep { 1000 mul usertime add { dup usertime lt {exit} if } loop pop } bind def /*showpage /showpage load def /showpage { 5000 sleep *showpage } bind def In GoScript, I can even have the interpreter wait for a keystroke before continuing: /pause { (con) (r) file read } bind def /*showpage /showpage load def /showpage { pause *showpage } bind def -- Ross Smith rsmith@well.sf.ca.us {apple,pacbell,hplabs,ucbvax}!well!rsmith