cn@allgfx.agi.oz (Con Neri) (11/28/90)
Has anybody out there done any extensive work on patterns in Postscript? In particular, has anybody found any problems with Prog 15 in the blue book? The example works fine as given but if you ask for a 45 degree screen then a rangecheck error occurs. Does anybody have a fix for this? With this same program I am experiencing some inconsistencies between the rsults from a Laserwriter and from a software rip. On the Laserwriter, I cannot increase the cellsize for the screen and see an expected difference. There is a difference but trivial. I have changed the line pat 8 1 ang 72 300 32 div div setpattern to pat 8 1 ang 72 300 64 div div setpattern and pat 8 1 ang 72 300 80 div div setpattern and pat 8 1 ang 72 300 128 div div setpattern and still there is no difference and no errors. On the software rip, the screen increases in size (frequency decreases) as expected. Does anyone have any ideas? Also, where is the magic number 72 200 32 div div plucked from? Thanks in advance for any help CON NERI All Graphic R+D e-mail: cn@allgfx.agi.oz.au 49-53 Barry ST tele: +61-3-3471722 Carlton fax : +61-3-3472175 Vic 3053 AUSTRALIA