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my-emacs-d/elpa/zone-nyan-20161014.154/zone-nyan.el
Gergely Polonkai 3e2daeaea5 Update zone-nyan package
2016-10-14 19:02:30 +02:00

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;;; zone-nyan.el --- Zone out with nyan cat
;; Copyright (C) 2015-2016 Vasilij Schneidermann <v.schneidermann@gmail.com>
;; Author: Vasilij Schneidermann <v.schneidermann@gmail.com>
;; URL: https://github.com/wasamasa/zone-nyan
;; Package-Version: 20161014.154
;; Version: 0.2.2
;; Package-Requires: ((esxml "0.3.1"))
;; Keywords: zone
;; This file is NOT part of GNU Emacs.
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; A zone program displaying the infamous nyan cat animation. Best
;; viewed in a graphical Emacs instance with SVG support.
;; See the README for more info:
;; https://github.com/wasamasa/zone-nyan
;;; Code:
(require 'esxml)
(defgroup zone-nyan nil
"Zone out with nyan cat"
:group 'zone
:prefix "zone-nyan-")
;;; palette
(defvar zone-nyan-palette
'((black :gui "#000000" :term "color-16" :ascii " ")
(white :gui "#ffffff" :term "color-231" :ascii "@@")
(gray :gui "#999999" :term "color-246" :ascii ";;")
(indigo :gui "#003366" :term "color-18" :ascii "::")
(red :gui "#ff0000" :term "color-196" :ascii "##")
(orange :gui "#ff9900" :term "color-208" :ascii "==")
(yellow :gui "#ffff00" :term "color-226" :ascii "--")
(green :gui "#33ff00" :term "color-82" :ascii "++")
(cyan :gui "#0099ff" :term "color-33" :ascii "~~")
(violet :gui "#6633ff" :term "color-57" :ascii "$$")
(rose :gui "#ff99ff" :term "color-213" :ascii "??")
(pink :gui "#ff3399" :term "color-198" :ascii "<>")
(rouge :gui "#ff9999" :term "color-210" :ascii "()")
(bread :gui "#ffcc99" :term "color-216" :ascii "##")
"Palette for GUI, 256 color and ASCII display of nyan cat."))
(defcustom zone-nyan-gui-type 'svg
"Rendering type on graphical displays."
:type '(choice (const :tag "SVG" svg)
(const :tag "Text" text))
:group 'zone-nyan)
(defcustom zone-nyan-term-type 'color
"Rendering type on textual displays."
:type '(choice (const :tag "Color" color)
(const :tag "ASCII" ascii))
:group 'zone-nyan)
;;; data
(defun zone-nyan-rainbow (flip)
"Return a list of rectangles describing a rainbow.
If FLIP is non-nil, the rainbow is flipped horizontally."
(if flip
'([ 0 0 2 3 red]
[ 2 1 8 3 red]
[10 0 8 3 red]
[18 1 8 3 red]
[ 0 3 2 3 orange]
[ 2 4 8 3 orange]
[10 3 8 3 orange]
[18 4 8 3 orange]
[ 0 6 2 3 yellow]
[ 2 7 8 3 yellow]
[10 6 8 3 yellow]
[18 7 8 3 yellow]
[ 0 9 2 3 green]
[ 2 10 8 3 green]
[10 9 8 3 green]
[18 10 8 3 green]
[ 0 12 2 3 cyan]
[ 2 13 8 3 cyan]
[10 12 8 3 cyan]
[18 13 8 3 cyan]
[ 0 15 2 3 violet]
[ 2 16 8 3 violet]
[10 15 8 3 violet]
[18 16 8 3 violet])
'([ 0 1 3 3 red]
[ 3 0 8 3 red]
[11 1 8 3 red]
[19 0 8 3 red]
[ 0 4 3 3 orange]
[ 3 3 8 3 orange]
[11 4 8 3 orange]
[19 3 8 3 orange]
[ 0 7 3 3 yellow]
[ 3 6 8 3 yellow]
[11 7 8 3 yellow]
[19 6 8 3 yellow]
[ 0 10 3 3 green]
[ 3 9 8 3 green]
[11 10 8 3 green]
[19 9 8 3 green]
[ 0 13 3 3 cyan]
[ 3 12 8 3 cyan]
[11 13 8 3 cyan]
[19 12 8 3 cyan]
[ 0 16 3 3 violet]
[ 3 15 8 3 violet]
[11 16 8 3 violet]
[19 15 8 3 violet])))
(defun zone-nyan-star (x y frame)
"Return a list of rectangles describing a star at X|Y.
FRAME is a number between 0 (inclusive) and 6 (exclusive) and
stands for its animation progress."
(cond
((= frame 0)
(list `[,(+ x 0) ,(+ y 0) 1 1 white]))
((= frame 1)
(list `[,(+ x 1) ,(+ y 0) 1 1 white]
`[,(+ x 0) ,(+ y 1) 1 1 white]
`[,(+ x 2) ,(+ y 1) 1 1 white]
`[,(+ x 1) ,(+ y 2) 1 1 white]))
((= frame 2)
(list `[,(+ x 2) ,(+ y 0) 1 2 white]
`[,(+ x 0) ,(+ y 2) 2 1 white]
`[,(+ x 3) ,(+ y 2) 2 1 white]
`[,(+ x 2) ,(+ y 3) 1 2 white]))
((= frame 3)
(list `[,(+ x 3) ,(+ y 0) 1 2 white]
`[,(+ x 0) ,(+ y 3) 2 1 white]
`[,(+ x 3) ,(+ y 3) 1 1 white]
`[,(+ x 5) ,(+ y 3) 2 1 white]
`[,(+ x 3) ,(+ y 5) 1 2 white]))
((= frame 4)
(list `[,(+ x 3) ,(+ y 0) 1 1 white]
`[,(+ x 1) ,(+ y 1) 1 1 white]
`[,(+ x 5) ,(+ y 1) 1 1 white]
`[,(+ x 0) ,(+ y 3) 1 1 white]
`[,(+ x 6) ,(+ y 3) 1 1 white]
`[,(+ x 1) ,(+ y 5) 1 1 white]
`[,(+ x 5) ,(+ y 5) 1 1 white]
`[,(+ x 3) ,(+ y 6) 1 1 white]))
((= frame 5)
(list `[,(+ x 3) ,(+ y 0) 1 1 white]
`[,(+ x 0) ,(+ y 3) 1 1 white]
`[,(+ x 6) ,(+ y 3) 1 1 white]
`[,(+ x 3) ,(+ y 6) 1 1 white]))))
(defun zone-nyan-stars (frame)
"Return a list of rectangles describing a star constellation at X|Y.
FRAME is a number between 0 (inclusive) and 12 (exclusive) and
stands for its animation progress."
(cond
((= frame 0)
(append (zone-nyan-star 41 0 1)
(zone-nyan-star 65 12 3)
(zone-nyan-star 0 21 1)
(zone-nyan-star 8 41 5)
(zone-nyan-star 69 56 0)
(zone-nyan-star 36 64 2)))
((= frame 1)
(append (zone-nyan-star 34 -1 2)
(zone-nyan-star 57 7 4)
(zone-nyan-star 5 44 0)
(zone-nyan-star 66 56 0)
(zone-nyan-star 27 63 3)))
((= frame 2)
(append (zone-nyan-star 25 -2 3)
(zone-nyan-star 49 7 5)
(zone-nyan-star 66 19 3)
(zone-nyan-star 0 43 1)
(zone-nyan-star 57 53 5)
(zone-nyan-star 18 63 4)))
((= frame 3)
(append (zone-nyan-star 16 -2 4)
(zone-nyan-star 46 10 0)
(zone-nyan-star 58 19 4)
(zone-nyan-star 48 53 4)
(zone-nyan-star 9 63 5)))
((= frame 4)
(append (zone-nyan-star 7 -2 5)
(zone-nyan-star 41 9 1)
(zone-nyan-star 50 19 5)
(zone-nyan-star 39 53 3)
(zone-nyan-star 6 66 0)))
((= frame 5)
(append (zone-nyan-star 4 1 0)
(zone-nyan-star 34 8 2)
(zone-nyan-star 47 22 0)
(zone-nyan-star 66 41 3)
(zone-nyan-star 32 54 2)
(zone-nyan-star 1 65 1)))
((= frame 6)
(append (zone-nyan-star -1 0 1)
(zone-nyan-star 25 7 3)
(zone-nyan-star 42 21 1)
(zone-nyan-star 58 41 4)
(zone-nyan-star 27 55 1)))
((= frame 7)
(append (zone-nyan-star 16 7 4)
(zone-nyan-star 35 20 2)
(zone-nyan-star 50 41 5)
(zone-nyan-star 24 56 0)
(zone-nyan-star 67 63 3)))
((= frame 8)
(append (zone-nyan-star 65 -2 3)
(zone-nyan-star 7 7 5)
(zone-nyan-star 26 19 3)
(zone-nyan-star 44 44 0)
(zone-nyan-star 15 53 5)
(zone-nyan-star 59 63 4)))
((= frame 9)
(append (zone-nyan-star 57 -2 4)
(zone-nyan-star 4 10 0)
(zone-nyan-star 17 19 4)
(zone-nyan-star 35 42 2)
(zone-nyan-star 7 53 4)
(zone-nyan-star 51 63 5)))
((= frame 10)
(append (zone-nyan-star 49 -2 5)
(zone-nyan-star -1 9 1)
(zone-nyan-star 8 19 5)
(zone-nyan-star 26 41 3)
(zone-nyan-star -1 53 3)
(zone-nyan-star 48 66 0)))
((= frame 11)
(append (zone-nyan-star 46 1 0)
(zone-nyan-star 5 22 0)
(zone-nyan-star 17 41 4)
(zone-nyan-star -4 53 4)
(zone-nyan-star 43 65 1)))))
(defun zone-nyan-tail (frame)
"Return a list of rectangles describing a tail.
FRAME is a number between 0 (inclusive) and 6 (exclusive) and
stands for its animation progress."
(cond
((= frame 0)
'([ 0 0 4 3 black]
[ 1 1 4 3 black]
[ 2 2 4 3 black]
[ 3 3 3 3 black]
[ 5 6 1 1 black]
[ 1 1 2 1 gray]
[ 2 2 2 1 gray]
[ 3 3 2 1 gray]
[ 4 4 2 1 gray]))
((= frame 1)
'([ 1 1 2 4 black]
[ 0 2 4 2 black]
[ 2 3 4 3 black]
[ 4 6 2 1 black]
[ 1 2 2 2 gray]
[ 2 4 2 1 gray]
[ 4 4 2 2 gray]))
((= frame 2)
'([ 5 4 1 1 black]
[ 2 5 4 1 black]
[ 0 6 6 2 black]
[ 1 8 4 1 black]
[ 2 6 4 1 gray]
[ 1 7 3 1 gray]))
((= frame 3)
'([ 4 4 2 1 black]
[ 2 5 4 3 black]
[ 1 6 2 4 black]
[ 0 7 4 2 black]
[ 4 5 2 2 gray]
[ 2 6 2 1 gray]
[ 1 7 2 2 gray]))
((= frame 4)
'([ 0 2 4 1 black]
[-1 3 7 2 black]
[ 1 5 5 1 black]
[ 4 6 2 1 black]
[ 0 3 3 1 gray]
[ 1 4 4 1 gray]
[ 5 5 1 1 gray]))
((= frame 5)
'([ 1 1 2 4 black]
[ 0 2 4 2 black]
[ 2 3 4 3 black]
[ 4 6 2 1 black]
[ 1 2 2 2 gray]
[ 2 4 2 1 gray]
[ 4 4 2 2 gray]))))
(defun zone-nyan-legs (frame)
"Return a list of rectangles describing a set of legs.
FRAME is a number between 0 (inclusive) and 6 (exclusive) and
stands for its animation progress."
(cond
((= frame 0)
'([ 1 0 2 1 black]
[ 1 1 3 1 gray]
[ 0 1 1 3 black]
[ 1 3 3 1 black]
[ 3 2 2 1 black]
[ 1 2 2 1 gray]
[ 6 2 4 1 black]
[ 6 3 3 1 black]
[ 7 2 2 1 gray]
[15 2 4 1 black]
[16 3 3 1 black]
[16 2 2 1 gray]
[20 2 4 1 black]
[21 3 2 1 black]
[21 2 2 1 gray]))
((= frame 1)
'([ 2 0 3 3 black]
[ 1 1 3 3 black]
[ 2 1 2 2 gray]
[ 6 2 1 1 black]
[ 7 2 3 2 black]
[ 7 2 2 1 gray]
[16 2 1 1 black]
[17 2 3 2 black]
[17 2 2 1 gray]
[21 2 1 1 black]
[22 2 3 2 black]
[22 2 2 1 gray]))
((= frame 2)
'([ 2 1 3 4 black]
[ 5 3 1 1 black]
[ 3 2 2 2 gray]
[ 7 3 1 1 black]
[ 8 3 3 2 black]
[ 8 3 2 1 gray]
[17 3 1 1 black]
[18 3 3 2 black]
[18 3 2 1 gray]
[22 3 1 1 black]
[23 3 3 2 black]
[23 3 2 1 gray]))
((= frame 3)
'([ 2 1 3 3 black]
[ 1 2 3 3 black]
[ 2 2 2 2 gray]
[ 6 3 1 1 black]
[ 7 3 3 2 black]
[ 7 3 2 1 gray]
[16 3 1 1 black]
[17 3 3 2 black]
[17 3 2 1 gray]
[21 3 1 1 black]
[22 3 3 2 black]
[22 3 2 1 gray]))
((= frame 4)
'([ 1 0 3 3 black]
[ 0 1 3 3 black]
[-1 2 3 3 black]
[ 0 2 2 2 gray]
[ 2 2 1 1 gray]
[ 4 3 1 1 black]
[ 5 3 3 2 black]
[ 5 3 2 1 gray]
[14 3 1 1 black]
[15 3 3 2 black]
[15 3 2 1 gray]
[19 3 1 1 black]
[20 3 3 2 black]
[20 3 2 1 gray]))
((= frame 5)
'([ 1 0 3 3 black]
[ 0 1 3 3 black]
[-1 2 3 3 black]
[ 0 2 2 2 gray]
[ 1 1 1 1 gray]
[ 2 2 1 1 gray]
[ 4 3 3 2 black]
[ 5 3 2 1 gray]
[ 7 3 1 1 black]
[14 3 3 2 black]
[15 3 2 1 gray]
[17 3 1 1 black]
[19 3 1 1 black]
[20 2 3 3 black]
[21 2 1 1 gray]
[20 3 2 1 gray]))))
(defun zone-nyan-pop-tart ()
"Return a list of rectangles describing a pop tart."
'([ 2 0 17 18 black]
[ 1 1 19 16 black]
[ 0 2 21 14 black]
[ 2 1 17 16 bread]
[ 1 2 19 14 bread]
[ 4 2 13 14 rose]
[ 3 3 15 12 rose]
[ 2 4 17 10 rose]
[ 9 3 1 1 pink]
[12 3 1 1 pink]
[ 4 4 1 1 pink]
[16 5 1 1 pink]
[ 8 7 1 1 pink]
[ 5 9 1 1 pink]
[ 9 10 1 1 pink]
[ 3 11 1 1 pink]
[ 7 13 1 1 pink]
[ 4 14 1 1 pink]))
(defun zone-nyan-face ()
"Return a list of rectangles describing a face."
'([ 2 0 2 1 black]
[ 1 1 4 2 black]
[ 5 2 1 1 black]
[12 0 2 1 black]
[11 1 4 2 black]
[10 2 1 1 black]
[ 0 5 16 5 black]
[ 1 3 14 8 black]
[ 2 3 12 9 black]
[ 3 3 10 10 black]
[ 2 1 2 3 gray]
[ 4 2 1 2 gray]
[ 5 3 1 1 gray]
[12 1 2 3 gray]
[11 2 1 2 gray]
[10 3 1 1 gray]
[ 2 4 12 7 gray]
[ 1 5 14 5 gray]
[ 3 11 10 1 gray]
[ 2 8 2 2 rouge]
[13 8 2 2 rouge]
[ 4 6 2 2 black]
[ 4 6 1 1 white]
[11 6 2 2 black]
[11 6 1 1 white]
[ 5 10 7 1 black]
[ 5 9 1 1 black]
[ 8 9 1 1 black]
[11 9 1 1 black]
[ 9 7 1 1 black]))
;;; SVG
(defvar zone-nyan-svg-size 70
"Virtual SVG canvas size.")
(defun zone-nyan-svg-scale (width height)
"Calculate the maximum scaling factor given WIDTH and HEIGHT.
The result describes how large a tile in a grid with
`zone-nyan-svg-size' as size can be."
(/ (min width height) zone-nyan-svg-size))
(defun zone-nyan-svg-root (width height scale x-offset y-offset body)
"Wrap BODY in a SVG root element and return the appropriate SXML.
WIDTH and HEIGHT designate the dimensions in pixels, SCALE,
X-OFFSET and Y-OFFSET transform the virtual canvas to a pixel art
grid. Additionally to that, clipping of the virtual canvas is
ensured."
`(svg (@ (xmlns "http://www.w3.org/2000/svg")
(width ,(number-to-string width))
(height ,(number-to-string height)))
(defs
(clipPath (@ (id "clip-path"))
(rect (@ (x "0") (y "0")
(width ,(number-to-string zone-nyan-svg-size))
(height ,(number-to-string zone-nyan-svg-size))))))
(g (@ (style "clip-path: url(#clip-path);")
(transform ,(format "translate(%s,%s) scale(%s)"
x-offset y-offset scale)))
,@body)))
(defun zone-nyan-svg-group (x y body)
"Wrap BODY in a SVG group element at X and Y and return the appropriate SXML.
X and Y are interpreted as grid coordinates."
`(g (@ (transform ,(format "translate(%s,%s)" x y)))
,@body))
(defun zone-nyan-svg-rect (x y width height fill)
"Returns a SVG rect element as SXML.
X and Y are interpreted as grid coordinates, WIDTH and HEIGHT are
interpreted as grid units, FILL is a hex code string."
`(rect (@ (x ,(number-to-string x))
(y ,(number-to-string y))
(width ,(number-to-string width))
(height ,(number-to-string height))
(fill ,fill))))
(defun zone-nyan-svg-to-sxml (width height scale x y &rest body)
"Return a SXML representation of BODY.
WIDTH and HEIGHT correspond to the size, SCALE, X and Y are used
to magnify and translate BODY. BODY itself is a list where every
three items are the X offset, Y offset and a list of rectangles.
Each rectangle is represented as a vector with a X and Y
component, width, height and fill color which is looked up in
`zone-nyan-palette'."
(let (groups)
(while body
(let* ((x-offset (pop body))
(y-offset (pop body))
(rects (pop body))
group)
(dolist (rect rects)
(let* ((x (aref rect 0))
(y (aref rect 1))
(width (aref rect 2))
(height (aref rect 3))
(color (aref rect 4))
(fill (plist-get (cdr (assoc color zone-nyan-palette)) :gui)))
(push (zone-nyan-svg-rect x y width height fill)
group)))
(push (zone-nyan-svg-group x-offset y-offset (nreverse group))
groups)))
(zone-nyan-svg-root width height scale x y (nreverse groups))))
(defun zone-nyan-svg-image (time)
"Return a SVG string for a point in TIME."
(let* ((edges (window-inside-pixel-edges))
(width (- (nth 2 edges) (car edges)))
(height (- (nth 3 edges) (cadr edges)))
(scale (zone-nyan-svg-scale width height))
(x-offset (floor (/ (- width (* zone-nyan-svg-size scale)) 2.0)))
(y-offset (floor (/ (- height (* zone-nyan-svg-size scale)) 2.0))))
(when (> scale 0)
(let* ((frame (mod time 6))
(star-frame (mod time 12))
(rainbow-flipped (not (zerop (mod (/ time 2) 2))))
(pop-tart-offset (if (< frame 2) 0 1))
(face-x-offset (if (or (zerop frame) (> frame 3)) 0 1))
(face-y-offset (if (or (< frame 2) (> frame 4)) 0 1)))
(sxml-to-xml
(zone-nyan-svg-to-sxml
width height scale x-offset y-offset
0 0 (list (vector 0 0 zone-nyan-svg-size zone-nyan-svg-size 'indigo))
0 26 (zone-nyan-rainbow rainbow-flipped)
0 0 (zone-nyan-stars star-frame)
19 32 (zone-nyan-tail frame)
23 41 (zone-nyan-legs frame)
25 (+ 25 pop-tart-offset) (zone-nyan-pop-tart)
(+ 35 face-x-offset) (+ 30 face-y-offset) (zone-nyan-face)))))))
;;; text
(defvar zone-nyan-text-size 40
"Virtual canvas size.")
(defun zone-nyan-text-canvas (init)
"Returns an empty text canvas to paint rectangles on.
INIT is the initial color to fill it with."
(let ((canvas (make-vector zone-nyan-text-size nil)))
(dotimes (i zone-nyan-text-size)
(aset canvas i (make-vector zone-nyan-text-size init)))
canvas))
(defun zone-nyan-text-in-bounds (x y)
"Non-nil if X|Y is a coordinate not out of bounds."
(and (>= x 0) (< x zone-nyan-text-size)
(>= y 0) (< y zone-nyan-text-size)))
(defun zone-nyan-text-pixel (canvas x y fill)
"Paint a pixel on CANVAS at X|Y with FILL."
(when (zone-nyan-text-in-bounds x y)
(aset (aref canvas y) x fill)))
(defun zone-nyan-text-rect (canvas x y width height fill)
"Paint a rectangle on CANVAS at X|Y with FILL.
WIDTH and HEIGHT are its dimensions."
(dotimes (i height)
(dotimes (j width)
(zone-nyan-text-pixel canvas (+ x j) (+ y i) fill))))
(defun zone-nyan-text-paint-canvas (canvas &rest body)
"Paint groups of rectangles to CANVAS.
BODY is a list where every three items are the X offset, Y offset
and a list of rectangles. Each rectangle is represented as a
vector with a X and Y component, width, height and fill color."
(while body
(let* ((x-offset (pop body))
(y-offset (pop body))
(rects (pop body)))
(dolist (rect rects)
(let* ((x (aref rect 0))
(y (aref rect 1))
(width (aref rect 2))
(height (aref rect 3))
(fill (aref rect 4)))
(zone-nyan-text-rect canvas (+ x-offset x) (+ y-offset y)
width height fill))))))
(defun zone-nyan-text-to-string (canvas)
"Return a textual representation of CANVAS."
(with-temp-buffer
(dotimes (i (length canvas))
(dotimes (j (length (aref canvas 0)))
(let* ((color (aref (aref canvas i) j))
(mappings (cdr (assoc color zone-nyan-palette))))
(cond
((eq zone-nyan-gui-type 'text)
(let ((fill (plist-get mappings :gui)))
(insert (propertize " " 'face `(:background ,fill)))))
((eq zone-nyan-term-type 'color)
(let ((fill (plist-get mappings :term)))
(insert (propertize " " 'face `(:background ,fill)))))
((eq zone-nyan-term-type 'ascii)
(insert (plist-get mappings :ascii))))))
(insert "\n"))
(buffer-string)))
(defun zone-nyan-text-image (time)
"Return a buffer string for a point in TIME."
(let ((width (window-body-width))
(height (window-body-height)))
(if (or (< width 80) (< height 40))
(format "zone-nyan requires a 80x40 canvas\ncurrent dimensions: %dx%d"
width height)
(let* ((canvas (zone-nyan-text-canvas 'indigo))
(frame (mod time 6))
(star-frame (mod time 12))
(rainbow-flipped (not (zerop (mod (/ time 2) 2))))
(pop-tart-offset (if (< frame 2) 0 1))
(face-x-offset (if (or (zerop frame) (> frame 3)) 0 1))
(face-y-offset (if (or (< frame 2) (> frame 4)) 0 1)))
(zone-nyan-text-paint-canvas
canvas
-15 11 (zone-nyan-rainbow rainbow-flipped)
-15 -15 (zone-nyan-stars star-frame)
4 17 (zone-nyan-tail frame)
8 26 (zone-nyan-legs frame)
10 (+ 10 pop-tart-offset) (zone-nyan-pop-tart)
(+ 20 face-x-offset) (+ 15 face-y-offset) (zone-nyan-face))
(zone-nyan-text-to-string canvas)))))
;;; frontend
(defun zone-nyan-image (time)
"Create an image of nyan cat at TIME."
(if (display-graphic-p)
(cond
((eq zone-nyan-gui-type 'svg)
(propertize " " 'display
(create-image (zone-nyan-svg-image time) 'svg t)))
((eq zone-nyan-gui-type 'text)
(zone-nyan-text-image time))
(t (user-error "Invalid value for `zone-nyan-gui-type'")))
(if (memq zone-nyan-term-type '(color ascii))
(zone-nyan-text-image time)
(user-error "Invalid value for `zone-nyan-term-type'"))))
(defcustom zone-nyan-interval 0.07
"Amount of time to wait until displaying the next frame."
:type 'float
:group 'zone-nyan)
(defcustom zone-nyan-bg-music-program nil
"Program to call for playing background music."
:type '(choice (const :tag "None" nil)
string)
:group 'zone-nyan)
(defcustom zone-nyan-bg-music-args nil
"Optional list of arguments for `zone-nyan-bg-music-program'."
:type '(repeat string)
:group 'zone-nyan)
(defcustom zone-nyan-hide-progress nil
"Won't report progress information if set."
:type 'boolean
:group 'zone-nyan)
(defvar zone-nyan-bg-music-process nil
"Current BG music process.")
(defvar zone-nyan-progress-timer nil
"Timer for displaying the progress.
It fires every 100ms.")
(defvar zone-nyan-progress 0
"Holds the current progress of the timer.")
(defun zone-nyan-report-progress ()
"Report current nyan progress."
(message "You've nyaned for %.1f seconds"
(/ zone-nyan-progress 10.0)))
(defun zone-nyan-progress ()
"Progress function.
It informs the user just how many seconds they've wasted on
watching nyan cat run."
(unless zone-nyan-hide-progress
(zone-nyan-report-progress))
(setq zone-nyan-progress (1+ zone-nyan-progress)))
;;;###autoload
(defun zone-nyan ()
"Zone out with nyan cat!"
(delete-other-windows)
(internal-show-cursor nil nil)
(let ((time 0)
;; HACK zone aborts on read-only buffers
(inhibit-read-only t))
(unwind-protect
(progn
(when zone-nyan-bg-music-program
(condition-case nil
(setq zone-nyan-bg-music-process
(apply 'start-process "zone nyan" nil
zone-nyan-bg-music-program
zone-nyan-bg-music-args))
(error
(message "Couldn't start background music")
(sit-for 5))))
(setq zone-nyan-progress 0
zone-nyan-progress-timer
(run-at-time 0 0.1 'zone-nyan-progress))
(while (not (input-pending-p))
(erase-buffer)
(insert (zone-nyan-image time))
(goto-char (point-min))
(sit-for zone-nyan-interval)
(setq time (1+ time))))
(internal-show-cursor nil t)
(when zone-nyan-bg-music-process
(delete-process zone-nyan-bg-music-process))
(when zone-nyan-progress-timer
(cancel-timer zone-nyan-progress-timer)
(when zone-nyan-hide-progress
(zone-nyan-report-progress))))))
;;;###autoload
(defun zone-nyan-preview ()
"Preview the `zone-nyan' zone program."
(interactive)
(let ((zone-programs [zone-nyan]))
(zone)))
(provide 'zone-nyan)
;;; zone-nyan.el ends here
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