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bug#5721: Feature request: Function that returns absolute coordinates
From: |
YAMAMOTO Mitsuharu |
Subject: |
bug#5721: Feature request: Function that returns absolute coordinates |
Date: |
Thu, 15 Jul 2010 18:27:26 +0900 |
User-agent: |
Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.8 (Shijō) APEL/10.6 Emacs/22.3 (sparc-sun-solaris2.8) MULE/5.0 (SAKAKI) |
>>>>> On Thu, 15 Jul 2010 10:59:52 +0200, Jan Djärv <jan.h.d@swipnet.se> said:
>>> That would require unscaled everywhere, even in pos-x-y, window
>>> sizes, font sizes and so on. I didin't think that was your
>>> suggestion.
>>
>> No, they are all frame-relative, so scaled by the scaling factor.
>>
>> The only places currently I can think of in the "absolute" category
>> are the frame parameters `left' and `top', and some screen
>> parameters such as `display-pixel-height', etc. Most of the values
>> in Lisp are designed as frame-relative.
> But many operations add and subtract from frame top, left and
> display width/height. How many? I don't know, I just suspect that
> there are many based on what I've seen when editing existing lisp
> files in Emacs. Not to mention C files.
Such operations are inherently relative-absolute conversions, and such
tasks should be done by a special conversion function we are
introducing. For most such use cases, we must take window decorations
(including the title bar) by the window manager into account anyway,
and the relative-scaled <-> absolute-unscaled conversion function will
make it more accurate, concise, and makes the intention clear.
>>>> Again, if we used absolute scaled coordinates to specify `left'
>>>> and `top' frame parameters, we could only place the frame to the
>>>> position whose coordinates are multiples of the scale factor.
>>
>>> As I said earlier, special functions to deal with that for those
>>> that care.
>>
>> I don't understand. What happens if a user moved the frame to
>> (101, 101) using the mouse under the scale factor 2, and he checked
>> (frame-parameter nil 'left)?
> Is 101 scaled or unscaled? If scaled, left would be 101. If not
> scaled, left would be 50. Loss of precision? Sure, but does it
> matter in most cases?
Of course scaled.
> Another idea would be if Emacs had its own internal coordinate
> system, say 0.0 to 1.0 or some integer based one, that already is
> display independent. It would fit nicely with the GnomeCanvas idea
> (see other thread). A bunch of work though...
What would happen to the absolute scaled coordinate system if scaling
factors are different from frame to frame?
YAMAMOTO Mitsuharu
mituharu@math.s.chiba-u.ac.jp
- bug#5721: Feature request: Function that returns absolute coordinates, (continued)
- bug#5721: Feature request: Function that returns absolute coordinates, YAMAMOTO Mitsuharu, 2010/07/14
- bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2010/07/15
- bug#5721: Feature request: Function that returns absolute coordinates, YAMAMOTO Mitsuharu, 2010/07/15
- bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2010/07/15
- bug#5721: Feature request: Function that returns absolute coordinates, YAMAMOTO Mitsuharu, 2010/07/15
- bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2010/07/15
- bug#5721: Feature request: Function that returns absolute coordinates, YAMAMOTO Mitsuharu, 2010/07/15
- bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2010/07/15
- bug#5721: Feature request: Function that returns absolute coordinates, YAMAMOTO Mitsuharu, 2010/07/15
- bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2010/07/15
- bug#5721: Feature request: Function that returns absolute coordinates,
YAMAMOTO Mitsuharu <=
- bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2010/07/15
- bug#5721: Feature request: Function that returns absolute coordinates, YAMAMOTO Mitsuharu, 2010/07/15
- bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2010/07/15
- bug#5721: Feature request: Function that returns absolute coordinates, YAMAMOTO Mitsuharu, 2010/07/15
- bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2010/07/16
- bug#5721: Feature request: Function that returns absolute coordinates, YAMAMOTO Mitsuharu, 2010/07/16
- bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2010/07/16
- bug#5721: Feature request: Function that returns absolute coordinates, YAMAMOTO Mitsuharu, 2010/07/16
- bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2010/07/16
- bug#5721: Feature request: Function that returns absolute coordinates, YAMAMOTO Mitsuharu, 2010/07/16