Emacs: Changing the font size on the fly

Sep 15, 2006| emacs

I have a tiny laptop: 8.9″ diagonally. With a 1024×768 pixels screen
resolution, things can get *pretty* small. The following functions use
the gnome-terminal-style shortcuts (Ctrl-plus, Ctrl-minus) to change
the font size without the mouse:

(defun sacha/increase-font-size ()
  (interactive)
  (set-face-attribute 'default
                      nil
                      :height
                      (ceiling (* 1.10
                                  (face-attribute 'default :height)))))
(defun sacha/decrease-font-size ()
  (interactive)
  (set-face-attribute 'default
                      nil
                      :height
                      (floor (* 0.9
                                  (face-attribute 'default :height)))))
(global-set-key (kbd "C-+") 'sacha/increase-font-size)
(global-set-key (kbd "C--") 'sacha/decrease-font-size)

You can view 2 comments or e-mail me at sacha@sachachua.com.

2 comments

Alex

2010-08-06T16:30:43Z

Did not work for me. I copied the code in my .emacs file. Did I do anything wrong? Any suggestion?

I have to say that I rather new to linux.

/Alex

Alex

2010-08-06T16:49:31Z

Correction:
It works now but not with the plus and minus that are located in the right most part of the keyboard (next to numbers). Those were the one I was initially trying with.

There is also one small issue. When I use ctrl-plus, the font size increases step by step (total 3 steps). However, when I use ctrl-minus, it shrinks the font to the smallest possible directly. A minor issue but just thougth to share it.

/Alex