mike%bambi@MOUTON.BELLCORE.COM.UUCP (05/30/86)
I'm using gpr_$text to draw characters on the screen. Suppose I have the text background color set to white, and the text drawing color set to black, and imagine drawing text onto a solid black screen. Rather than getting a contiguous white box with the characters in it, I get a bunch of discontiguous white boxes with black gaps between them -- which is not what I want. Question: is this a bug or a "feature"? I expect I could fix it by hacking the bounding boxes of the characters, but the standard system fonts all behave this way. Is there something else I can do (adjusting the character width, or something?) Otherwise I am forced to clear the entire text box before drawing in it, which is time-consuming and visually unpleasing. Mike Caplinger mike@bellcore.arpa ihnp4!bambi!mike
mishkin@apollo.UUCP.UUCP (06/02/86)
I'm using gpr_$text to draw characters on the screen.
Suppose I have the text background color set to white, and
the text drawing color set to black, and imagine drawing text
onto a solid black screen. Rather than getting a contiguous
white box with the characters in it, I get a bunch of
discontiguous white boxes with black gaps between them --
which is not what I want.
Question: is this a bug or a "feature"?
Forwarded from someone who should know:
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I guess its a feature. gpr_$text only ever draws the bits that are actually
present in the font. There are lots of ways around this:
1) if you want black-on-white everywhere, and you are using borrow mode,
call gpr_$set_color_map with pixel value zero set to one, and so on. Then
do your text normally.
2) if you just want text that is inverted in some places then either:
a) call gpr_$rectangle to clear the text field to the desired background
first. This may seem annoying, but its the way bitmap graphics with
general fonts works everywhere as far as I know.
b) if you are lazy and don't mind using one of the standard fixed width
fonts, we ship several "inverted fonts". They are the ones with .iv
in their names. They not only have all the bits inverted in the font,
but have no inter-character spacing, and have an extra pixel of background
surrounding each character. CRP and DSEE, for example, use these fonts
to display their banners.
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-- Nat Mishkin
Apollo Computer Inc.
apollo!mishkin
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