#+TITLE:     Demonstration of org tree slide presentation
#+AUTHOR:    Eric S Fraga
#+EMAIL:     e.fraga@ucl.ac.uk
#+DATE:      2013-01-26 Sat

Start by executing (=C-c C-c=) this emacs lisp code which will set
things up correctly.  To play the slide, hit =F8=, aka =M-x
org-tree-slide-mode RET=.  To finish the slide show, hit =F8= again.  Use
=C-F8= to see the table of contents at any time; the table of contents
supports navigation.  Hit =<right>= to resume presentation with any
given slide.

#+begin_src emacs-lisp :results none
  (require 'org-tree-slide)
  (defun esf/play-org-tree-slide ()
    (auto-fill-mode t)
    (evil-emacs-state)
    (flyspell-mode-off)
    (org-preview-latex-fragment)
    (org-toggle-pretty-entities)
    (setq sentence-highlight-mode nil)
    (text-scale-set 5)
    (delete-other-windows)
    (message "ESF playing org tree slide"))
  (add-hook 'org-tree-slide-mode-play-hook 'esf/play-org-tree-slide)
  (defun esf/stop-org-tree-slide ()
    (auto-fill-mode t)
    (evil-normal-state)
    (flyspell-mode-on)
    (setq sentence-highlight-mode t)
    (text-scale-set 1)
    (message "ESF stopping org tree slide"))
  (add-hook 'org-tree-slide-mode-stop-hook 'esf/stop-org-tree-slide)
  (local-set-key (kbd "<f8>") 'org-tree-slide-mode)
  (local-set-key (kbd "C-<f8>") 'org-tree-slide-content)
  (local-set-key (kbd "S-<f8>") 'org-tree-slide-skip-done-toggle)
  (setq org-format-latex-options '(:foreground "white" :background "black" :scale 3 :html-foreground "Black" :html-background "Transparent" :html-scale 1.0 :matchers ("begin" "$1" "$" "$$" "\\(" "\\["))
        org-latex-create-formula-image-program 'imagemagick
        org-tree-slide-heading-emphasis t
        )
  ;;(org-tree-slide-mode)
#+end_src

Execute the following code when wanting to edit the slides in a more
normal environment:

#+begin_src emacs-lisp :results none
  (evil-normal-state)
  (flyspell-mode-on)
  (text-scale-set 1)
#+end_src

* Introduction

  - this is short.
  - but could be longer.
* Equations
 
  - probably do not work:

    \begin{align}
    y & = \sqrt {x} \\
    z &= \int_0^\infty t \, dt
    \end{align}

  - actually, they do work but I cannot seem to get the right
    background colour: FIXED!  Used ImageMagick in lieu of dvipng.

  - What about a different latex fragment, such as $x \in [0,1)$?

  - they even work inline if we look at \alpha and \beta.

* Images

  [[./mip.png]]

* Actions
  - Do something
  - And something else
* Assignments
  - Joe does this
  - Jill does something else