Re: new frame-parameter "alpha"

[Seiji Zenitani]

On 2008/03/20, at 11:22, Ken Raeburn wrote:
> On Mar 14, 2008, at 07:02, Seiji Zenitani wrote:
> > Elisp syntax:
> > We can use both a floating point number (0.0-1.0) as well as an  
> > integer number (0-100).
>
> So 1 means almost-invisible and 1.0 means completely opaque?

Correct.
(Actually 1 brings 20% opaque, when "frame-alpha-lower-limit" is set  
to 20.)

> Do float-vs-int representations of the same value have such  
> opposite meanings in other parts of Emacs (outside of some possible  
> arithmetic cases)?
>
> Ken


One sample is 'line-spacing'.

 (setq line-spacing 1) ;; 1 pt
 (setq line-spacing 1.0) ;; relative height

We can also employ only float (or int)
in order to avoid confusion.


Seiji