Pixel Coords --> Character Coords

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3 total messages Started by Eric Eide Fri, 24 Jul 1992 17:10

#45

Author: Eric Eide
Date: Fri, 24 Jul 1992 17:10

20 lines
1363 bytes

Please forgive me a FAQ, but I couldn't find an answer in the online Epoch
documentation.

I have a mouse handling package that worked well under Epoch 3.2, but now it
fails under Epoch 4.0.  My problem is that button (and motion) events are now
described with pixel coordinates rather than character coordinates.  What I
need is a function to convert screen pixel coordinates into screen character
coordinates.  Where can I find such a thing, or how can I write one well?

(Alternately, I could use a function that converts a point-and-window value
into screen-relative character coordinates.  Epoch 4.0 provides a function to
turn pixel coordinates into a point and buffer and window.  But I want
character coordinates!)

Thanks for any help.

--
-------------------------------------------------------------------------------
Eric Eide          |          University of Utah Department of Computer Science
eeide@cs.utah.edu  | Buddhist to hot dog vendor: "Make me one with everything."

Pixel Coords --> Character Coords

#46

Author: Marc Andreessen
Date: Sun, 26 Jul 1992 03:59

7 lines
542 bytes

How about:

coords-to-point:
Convert X Y SCREEN in pixel coordinates to a list of
(POINT BUFFER WINDOW SCREEN).

Marc

Re: Pixel Coords --> Character Coords

#47

Author: Eric Eide
Date: Sun, 26 Jul 1992 14:58

23 lines
1773 bytes

In article <9207260359.AA02599@void.ncsa.uiuc.edu> Marc Andreessen writes:

Marc> How about: coords-to-point:
Marc> Convert X Y SCREEN in pixel coordinates to a list of
Marc> (POINT BUFFER WINDOW SCREEN).

I found this function, but what I want is a function that turns pixel
coordinates into character coordinates, not into a buffer point value.  In
other words, I want a function that turns pixel coordinates into (window line,
column position on that line), as Epoch 3.2 reports.  If I must, I can get by
with coords-to-point (I think), but it means rewriting a fair bit of my
mouse-handling package.  Bummer.

As an aside, of what use are pixel coordinates anyway, other than that the
function coords-to-point requires pixel coordinates?  I suppose that it's
easier for Epoch 4.0 to report pixel coordinates instead of character
coordinates, but is there anything that can be done with pixel coordinates
other than turning them into a (point buffer window screen) tuple?

--
-------------------------------------------------------------------------------
Eric Eide          |          University of Utah Department of Computer Science
eeide@cs.utah.edu  | Buddhist to hot dog vendor: "Make me one with everything."

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