| Re: More Q's on TV and Postscript [message #2709 is a reply to message #2708] |
Wed, 31 August 1994 03:56  |
steinhh
Messages: 260
Registered: June 1994
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Senior Member |
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In article <340vtmINN5tv@lanews.la.asu.edu>, rouse@sevens.la.asu.edu (Roger Rouse) writes:
|> Now that I can actually see the postscript output I've three more questions.
|>
|> 1. How do I get the picture to be black on white? If I try this trick
|>
|> a(where(a eq 0B)) = 225B
|>
|> then any plots that are with the picture disappear since plots are
|> done in black. This also makes the picture look very different! I've
|> also tried reloading the color arrays after set_plot,'ps' with and
|> without giving /COLOR in the call to DEVICE. What's the catch?
It's usually best done by redefining color 0 to be white, and color 255
to be black, use "TVLCT" (I think), first to get the color table,
modify it, and then put it back. I.e.:
tvlct,r,g,b,/get_.... ; (NOT sure about the actual wording here, butt..)
r(0)=255 & g(0)=255 & b(255)=255 ; Color 0 has full intensity -- white
r(255)=0 & g(255)=..... ; Color 255 has no intensity -- black
tvlct,r,g,b ; Put color table back
You might not have 255 colors available, so ther might be some few changes..
|>
|> 2. I would also like to use PLOTS to draw circles and things on the picture.
|> How can I position them correctly given that the position and size of the
|> picture is specified in centimeters (or inches) not NORMAL, DATA, or even
|> DEVICE coordinates?
Use:
DEV_COORD = convert_coord([x,y],/data,/to_device) ; Put something at [x,y]
plots,x,y,/device
You could, of course, also use /to_normal and /normal..
|>
|> 3. Wouldn't it be nice if TV understood all of the !p variable especially
|> !p.multi. Has anyone developed or know of a procedure, say PTV, that works
|> like PLOT (or PLOTS) but draws an image instead of a graph? If you've only
|> one picture then things go smoothly, but if you what a graph with a picture
|> next to it or some other combination things get complicated.
I'll leave this to Bill :-) (Thompson)
|>
|> I think that I can do what I want in the window, but the conversion to
|> postsrcipt does not reproduce what's in the window. I've tried using
|> TVRD but then you have the black-on-white problem again.
|>
Generally, this is not a good idea. Make your plots/tv statements as device
independent as possible, and use them (possibly slightly rewritten) separately
for PS devices. A piece of paper has a lot more pixels than a computer screen!
Stein Vidar
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