RE: char-width of a font? pixel-width of a future frame? NOT SOLVED

[David Reitter]

> How do I find out either
>
>     - what the (average) width of characters of a given font/ 
> fontset is? or
>
> `frame-char-width' or height gives the pixel width or height of the  
> frame's
> default font.

Yes, but they only work with an existing frame as parameter.
I only have a font/fontset or some frame-parameters, but not a frame.


>     - what, given a set of frame-parameters (including font and  
> width and
>     height), what the pixel-width and pixel-height of a frame are  
> going
>     to be once it is created?
>
> If the frame is to fit the buffer (you mentioned font size), then  
> you need
> to calculate the line length and number of lines, then multiply  
> these by the
> frame-char-width and frame-char-height. You can see code that  
> calculates
> frame size from buffer size here:
> http://www.emacswiki.org/elisp/fit-frame.el.

I need to know what width a frame is going to have in pixels, before  
it is created. Frames are not fitted by default, and I'm not trying  
to fit frames. I'm just trying to determine a decent position to open  
the frame at.

That's why I was asking for frame-char-width for a given font, to  
calculate the pixel-width.

> Otherwise, what do you mean by the frame size - it could be  
anything you
> want. What is the relation between the frame parameters you  
mention and the
> frame size you want?

Frames are created with whatever is set in the width / height  
specification of the default-frame-alist (or whatever is given to  
make-frame). These specifications are in characters / lines, not  
pixels. I just need to translate to pixels.

Anyone??

- D