jn@eva.uu.se (Jan Nilsson, Inst. for husdjurshygien, Skara) (05/19/88)
Hi, folks! I'm just trying to get into this. Is there anyone who likes to have a discussion regarding animal welfare? If so, please let me know. Bo Algers
djones@megatest.UUCP (Dave Jones) (05/26/88)
in article <26@eva.uu.se>, jn@eva.uu.se (Jan Nilsson, Inst. for husdjurshygien, Skara) says: > > Hi, folks! I'm just trying to get into this. > Is there anyone who likes to have a discussion regarding animal welfare? > If so, please let me know. > Bo Algers Welcome to comp.lang.smalltalk. I'm sure we're going to have plenty of fun just chatting. Concerning animal welfare, I must frankly state that I am apposed to it. What with all these "Reagan Cuts" in the wefare system, there are just to many humans who are in dire need of assistance. Yours truly, R. R. Danna
krm@aluxz.UUCP (Kurt Marko) (05/27/88)
In article <568@goofy.megatest.UUCP> djones@megatest.UUCP (Dave Jones) writes: >in article <26@eva.uu.se>, jn@eva.uu.se (Jan Nilsson, Inst. for husdjurshygien, Skara) says: >> >> Hi, folks! I'm just trying to get into this. >> Is there anyone who likes to have a discussion regarding animal welfare? > >Welcome to comp.lang.smalltalk. I'm sure we're going to have >plenty of fun just chatting. > > R. R. Danna If this is someone's idea of a joke, PLEASE STOP! Note that this newsgroup is "comp.lang.smalltalk" NOT "comp.lang.idle_chatter". Keep your chit chat to some other group. Now, if someone would like to start a serious discussion on this newsgroup, I'd be interested in hearing how/if people are beginning to use color graphics in Smalltalk applications. I run ST-80 on a Mac II, and the image from ParcPlace has some extra classes for color support, but I haven't gotten them to work the way I'd like (I'd really like to put up color views, with different colored labels, and text, etc.). I understand that the newer Tektronix machines have color (which is supposedly better documented than the ParcPlace source), but I haven't talked to anyone who has actually used the color capabilities. I hope we can get this newsgroup back on track with some meaningful dialog. Kurt Marko {att,ihnp4,...most_backbones...}!aluxz!krm
goldfain@osiris.cso.uiuc.edu (05/31/88)
I too am interested in color smalltalk on the Mac II, but haven't any project
I'm currently working on that will justify spending much time on it. I'm away
from the Mac right now, but here is a summary of what I have noticed.
1) To get started, the fileIn Color-Example has some examples. There are
primitives to do the 2 key things:
(a) set the colors in the "palette" (although an immense number of
distinct colors are evidently possible - far more than the human
eye can distinguish - as is typical of color PCs these days,
only a small number can simultaneously be plotted on the screen,
through the use of a color table. On my Mac II, I can only have
a table of 256 entries.)
(b) plot a "color form" on the display, where each such form has
"bitsperpixel" bits at each location specifying which color
table entry to use at that dot. (See class ColorDevice.)
2) Now if you want to create a multi-colored Browser View, for example, you
have to replace everything in that code that creates or modifies a Form, to
instead create a color form. (As a primitive step you can hack on Forms
like they do in the examples mentioned above. More elegant is to create a
parallel class ColorForm and teach it how to do all the things that Forms
can do. Or just some of the things, to keep the task within reason.)
Finally, you will need to have all code that plots a Form to instead make
the primitive call to plot a ColorForm. There is less of this than one
might think - here is where the modularity of the system design can shine.
3) Also, one needs some code to run at the outset that insures the color table
is the way you like it when you start up Smalltalk, or after you've done
something else, your pretty sky blue Browser label may have turned a sickly
puce!
4) After all of that is working, you can finally add modifications to the
Browser MVC triad that turn a label green, or the scroll bar to three
colors, or whatever. But keep in mind that this whole thing will likely
run a bit slower and will definitely consume more memory (8 times as much
with a 256-color palette) as the black and white image. So you may not
want all that power everywhere.
CAVEAT: This implementation programme is my own concept of how to go about
this. I am only a "junior Smalltalk hacker", and have only looked around
the color classes for a few hours. So there might be a much better way.
All I have done is step 3 and a beginning of step 1.
One nice application for all of this on the Mac would be to have a "yellow
button region" (visible in yellow) on all CodeViews, that responds to
unmodified mouseclicks by popping up the yellow button menu. That is the only
one of the three that is really inconvenient on a Mac II with its one-button
mouse. I would think a band on the right edge of the view would be a nice
place for it.
I can post my code to do step 3, and what I have for step 1, if anybody is
interested. If anyone does some more of the above, or has any other color
Smalltalk code they're proud of, I'll be happy to beta-test it for you. (:-)
That is to say, I'd love it if somebody else did this for me!
Mark Goldfain arpa: goldfain@osiris.cso.uiuc.edu
US Mail: Mark Goldfain
(A lowly student at)--> Department of Computer Science
University of Illinois at U-C
1304 West Springfield Avenue
Urbana, Illinois 61801