On windows gnu emacs (~21.3) this code will return the pixel-position
of the current point! (or at least, within a few pixels) Returns values
in form (x . y).
I wanted this feature and couldn't find it... all I found were posts in
lists also asking for the feature, with people denying it could be done
in elisp. Well, that is not true! ;)
I believe this should work in Xemacs and on other operating systems and
recent emacs versions.
I am currently using it to display an "intellisense"-like tooltip.
Which, on windows, gnu emacs has no tooltip, so I am executing a little
python app instead which handles the tooltip for me (via wx libraries).
Works very nice.
; helper func
(defun get-param-safe (s)
"Sometimes frame-paramater returns values of (+ -4)"
(let ((left (frame-parameter nil s)))
(if (listp left) (cadr left) left)))
; this is it
(defun point-to-pixel ()
"Converts the position of the current point to pixel
coordinates relative to the screen (i.e. window manager)."
(let ((left (car (window-edges)))
(top (cadr (window-edges)))
(point-left (- (point) (point-at-bol)))
(point-top (point)))
(let ((x (+ (* (frame-char-width) left) ; x =
(* (frame-char-width) point-left)
(get-param-safe 'left)))
(y (+ (* (frame-char-height) ; y =
(+ top
(count-lines (window-start) (point))))
(get-param-safe 'top))))
(cons x y))))
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