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Re: Add a function that returns pixel distance between points?
From: |
Eli Zaretskii |
Subject: |
Re: Add a function that returns pixel distance between points? |
Date: |
Sun, 31 Jan 2021 17:24:56 +0200 |
> From: Yuan Fu <casouri@gmail.com>
> Date: Sun, 31 Jan 2021 00:17:58 -0500
> Cc: emacs-devel@gnu.org
>
> I want to align text-based tables by pixel size, as in:
>
> | header | header | header |
> | 1 | 1 | 8 |
> | 2 | 6 | 3 |
>
> When the text is displayed in variable-pitch font, the bars aren’t aligned.
> I’m using display property (space :align-to) to align those bars. To know
> with pixel position to align to, I need to calculate each column’s pixel
> width, and met the difficulties mentioned earlier.
So the columns in your case have width that changes dynamically? That
is, if I type enough characters into a cell that the current width is
no longer sufficient, the width of the cell's column will be
increased?
Also, I don't think I understand why it is a problem for you that
posn-at-point requires point to be visible -- are you generating the
table in a buffer that is not displayed, or in a portion of a buffer
that is not visible? Or is there some other reason why you have
problems with this requirement of posn-at-point?
Finally, I'm not sure why the behavior of window-text-pixel-size is a
problem: if you use :align-to with pixel units (as opposed to column
units), then you should _want_ it to account for stuff like
line-prefix, no?