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slime-volleyball.el
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slime-volleyball.el
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;;; slime-volleyball.el --- An SVG Slime Volleyball Game
;; Copyright (C) 2013 Thomas Fitzsimmons
;; Author: Thomas Fitzsimmons <[email protected]>
;; Version: 1.1
;; Keywords: games
;; This program 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 of the License, or
;; (at your option) any later version.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; For RMF.
;; I was inspired by Bret Victor's "Inventing on Principle" talk [1] and wanted
;; to see how close Emacs could get to the graphical interactivity and feedback
;; of his environment.
;; The resulting research effort turned up some Emacs capabilities that were
;; new to me. I was happily surprised to find Emacs's librsvg support could
;; draw SVG right in a buffer. svg-clock showed me how to do the animation;
;; the erase-buffer/insert-image approach is inefficient but it works [2]. I
;; even came across some early-stage experimentation toward an Elisp vector
;; graphics library [3].
;; To put it all together, I decided to clone a great Java game I played a long
;; time ago (with the excuse of testing icedtea-web), Slime Volleyball [4].
;; This is the result; I hope you find it fun.
;; 1. http://vimeo.com/36579366
;; 2. http://elpa.gnu.org/packages/svg-clock.html
;; 3. http://lists.gnu.org/archive/html/bug-gnu-emacs/2010-05/msg00491.html
;; 4. http://oneslime.net/
;; Features
;; ========
;; * One player quest mode
;; (press SPC on start-up)
;; * Two player face-off mode
;; (press 2 on start-up)
;; * God mode: instantly apply Elisp framents to hack the game environment
;; (press G during the game)
;; * Slime training mode: a statistical learning algorithm for training
;; opponent slimes
;; (press t on start-up,
;; use M-: (slime-volleyball-save-strategy ...) to save the strategy, make
;; sure to manually save the quantize, hash-situation and controller
;; functions you come up with -- see green-slime.el.gz)
;;
;; I used this mode to train Green Slime and Grey Slime.
;; * Frame-by-frame debugging
;; (F9 to enter/exit frame-by-frame mode, F8 to advance a frame)
;; * Music: disabled by default due to EMMS requirement
;; (customize slime-volleyball-enable-sound)
;; Controls
;; ========
;; The controls are a little different than in other games because Emacs
;; doesn't recognized key-up events.
;; One Player Mode
;; ---------------
;; C-b, left, a: start moving left
;; C-f, right, d: start moving right
;; C-p, up, w: jump
;; C-n, down, s: stop
;; Two Player Mode
;; ---------------
;; Left Slime:
;; C-b, a: start moving left
;; C-f, d: start moving right
;; C-p, w: jump
;; C-n, s: stop
;; Right Slime:
;; left: start moving left
;; right: start moving right
;; up: jump
;; down: stop
;; Potential Future Features
;; =========================
;; * Network support for two player mode or slime Turing test
;; * Time-to-space mapping for opponent slime design, like in [1]
;; * 8-bit music composition mode
;; * A really hard non-statistical end boss
;;; Code:
(unless (require 'cl-lib nil t)
(require 'cl))
(defvar slime-volleyball-animation-timer nil)
(defcustom slime-volleyball-enable-sound nil
"Non-nil when slime-volleyball should play music."
:type 'boolean
:group 'slime-volleyball)
(defcustom slime-volleyball-beach-mode nil
"Non-nil when Slimes should compete on sand."
:type 'boolean
:group 'slime-volleyball)
(cl-defstruct slime-volleyball-slime
"A player in the game of slime volleyball"
player
jumping
points
controller
updater
v-y-i
v-y-f
v-x
x
y
delta-y
eye-center-x
eye-center-y
eye-radius
pupil-center-x
pupil-center-y
pupil-radius
color
speed)
(defmacro slime-volleyball-slime-move-function (number direction)
`(defun ,(intern (format "slime-volleyball-slime%d-%s" number direction)) ()
(,(intern (format "slime-volleyball-slime-%s" direction))
,(intern (format "slime-volleyball-slime%d" number)))))
(slime-volleyball-slime-move-function 1 "left")
(slime-volleyball-slime-move-function 1 "right")
(slime-volleyball-slime-move-function 1 "jump")
(slime-volleyball-slime-move-function 1 "stop")
(slime-volleyball-slime-move-function 2 "left")
(slime-volleyball-slime-move-function 2 "right")
(slime-volleyball-slime-move-function 2 "jump")
(slime-volleyball-slime-move-function 2 "stop")
(defun slime-volleyball-blue-slime-maybe-right ()
(when (not (eq (random 10) 3))
(slime-volleyball-slime-right slime-volleyball-slime2)))
(defun slime-volleyball-blue-slime-maybe-left ()
(when (not (eq (random 10) 3))
(slime-volleyball-slime-left slime-volleyball-slime2)))
(defun slime-volleyball-blue-slime-controller ()
(cond
((and (not slime-volleyball-blue-slime-serving)
(< (abs slime-volleyball-ball-velocity-x) 0.001)
(> slime-volleyball-ball-x (slime-volleyball-slime-x
slime-volleyball-slime2)))
;; Serve start.
(progn
(setq slime-volleyball-blue-slime-serving t)
(setq slime-volleyball-blue-slime-orig-x (slime-volleyball-slime-x
slime-volleyball-slime2))
(slime-volleyball-slime-right slime-volleyball-slime2)))
(slime-volleyball-blue-slime-serving
(if (> (slime-volleyball-slime-x slime-volleyball-slime2)
(+ slime-volleyball-blue-slime-orig-x
(/ slime-volleyball-slime-radius 8)))
(progn
(slime-volleyball-slime-stop slime-volleyball-slime2)))
(setq slime-volleyball-blue-slime-serving nil))
(t
(if (> slime-volleyball-ball-x slime-volleyball-net-x)
(progn
(if (> slime-volleyball-ball-y
(- slime-volleyball-scene-height
(* 2 slime-volleyball-slime-radius)))
(if (and (> slime-volleyball-ball-x (slime-volleyball-slime-x
slime-volleyball-slime2))
(< slime-volleyball-ball-x
(+ (slime-volleyball-slime-x
slime-volleyball-slime2)
(* 2 slime-volleyball-slime-radius))))
(slime-volleyball-slime-jump slime-volleyball-slime2)))
(if (> slime-volleyball-ball-x
(+ (slime-volleyball-slime-x
slime-volleyball-slime2)
(/ slime-volleyball-slime-radius 4)))
(slime-volleyball-blue-slime-maybe-right)
(slime-volleyball-blue-slime-maybe-left)))
(progn
(if (< slime-volleyball-ball-velocity-x 0)
(slime-volleyball-blue-slime-maybe-left)
(slime-volleyball-blue-slime-maybe-right)))))))
;; Arguments are expected values of moves.
(defun slime-volleyball-training-maximum-expected-value
(left right jump stop none)
(let* ((max-val (max left right jump stop none))
(max-list nil) (rand-max nil) (index 0))
;; Uncomment to make the learning slime more experimental.
;; (if (eq (random 10) 3)
;; (elt '((0 slime-volleyball-slime-left)
;; (1 slime-volleyball-slime-right)
;; (2 slime-volleyball-slime-jump)
;; (3 slime-volleyball-slime-stop)
;; (4 slime-volleyball-slime-none))
;; (random 3))
(dolist (check (list left right jump stop none))
(when (< (abs (- check max-val)) 0.001)
(push (list index
(elt (list 'slime-volleyball-slime-left
'slime-volleyball-slime-right
'slime-volleyball-slime-jump
'slime-volleyball-slime-stop
'slime-volleyball-slime-none)
index)) max-list))
(setq index (1+ index)))
(when (> (length max-list) 1)
(setq rand-max (elt max-list (random (length max-list)))))
(cond
(rand-max rand-max)
((< (abs (- left max-val)) 0.001)
'(0 slime-volleyball-slime-left))
((< (abs (- right max-val)) 0.001)
'(1 slime-volleyball-slime-right))
((< (abs (- jump max-val)) 0.001)
'(2 slime-volleyball-slime-jump))
((< (abs (- stop max-val)) 0.001)
'(3 slime-volleyball-slime-stop))
((< (abs (- none max-val)) 0.001)
'(4 slime-volleyball-slime-none)))
;;)
))
;; The following is from computer slime's perspective.
;;
;; Notation:
;; lp: went left, got a point
;; lnp: went left, didn't get a point
;; r: right
;; j: jump
;; s: stop
;; n: none (do nothing)
;;
;; For example:
;; lp lnp rp rnp jp jnp sp snp np nnp
;; ((20 30) (40 50) (60 70) (80 90) (0 10))
;;
;; Expected value of going left: lp / (lp + lnp)
(defun slime-volleyball-best-move (tallies)
(let* ((left-points (car (elt tallies 0)))
(left-no-points (cadr (elt tallies 0)))
(right-points (car (elt tallies 1)))
(right-no-points (cadr (elt tallies 1)))
(jump-points (car (elt tallies 2)))
(jump-no-points (cadr (elt tallies 2)))
(stop-points (car (elt tallies 3)))
(stop-no-points (cadr (elt tallies 3)))
(none-points (car (elt tallies 4)))
(none-no-points (cadr (elt tallies 4)))
(left-decisions (+ left-points left-no-points))
(right-decisions (+ right-points right-no-points))
(jump-decisions (+ jump-points jump-no-points))
(stop-decisions (+ stop-points stop-no-points))
(none-decisions (+ none-points none-no-points)))
(slime-volleyball-training-maximum-expected-value
(/ left-points (float left-decisions))
(/ right-points (float right-decisions))
(/ jump-points (float jump-decisions))
(/ stop-points (float stop-decisions))
(/ none-points (float none-decisions)))))
;; Dynamically-scoped slime-volleyball-save-strategy helper function.
(defun slime-volleyball-save-strategy-helper (key values)
(insert-string
(format "(puthash \"%s\" '%s %s)\n"
key
(symbol-name (cadr (slime-volleyball-best-move values)))
strategy-name)))
(defun slime-volleyball-save-strategy (file-name strategy-name)
(find-file file-name)
(with-current-buffer (file-name-nondirectory file-name)
(insert-string
(format "(setq %s (make-hash-table :test 'equal))\n"
strategy-name))
(maphash 'slime-volleyball-save-strategy-helper
slime-volleyball-training-slime-strategy)
(save-buffer)))
(defun slime-volleyball-training-quantize (value digits)
(let ((tens (expt 10.0 digits)))
(/ (fround (* value tens)) (float tens))))
(defun slime-volleyball-training-hash-situation ()
(let* (;; Ball.
(ball-x
(slime-volleyball-training-quantize slime-volleyball-ball-x 0))
(ball-y
(slime-volleyball-training-quantize slime-volleyball-ball-y 0))
(ball-v-x (slime-volleyball-training-quantize
slime-volleyball-ball-velocity-x 2))
(ball-v-y (slime-volleyball-training-quantize
slime-volleyball-ball-velocity-y 2))
;; Slime 1.
(slime1-real-x
(slime-volleyball-training-quantize
(slime-volleyball-slime-x slime-volleyball-slime1) 0))
(slime1-real-y
(slime-volleyball-training-quantize
(slime-volleyball-slime-y slime-volleyball-slime1) 0))
(slime1-x (slime-volleyball-training-quantize slime1-real-x 0))
(slime1-y (slime-volleyball-training-quantize slime1-real-y 0))
(slime1-v-x (slime-volleyball-training-quantize
(slime-volleyball-slime-v-x slime-volleyball-slime1) 2))
(slime1-v-y (slime-volleyball-training-quantize
(slime-volleyball-slime-v-y-f slime-volleyball-slime1) 2))
;; Slime 2.
(slime2-real-x
(slime-volleyball-training-quantize
(slime-volleyball-slime-x slime-volleyball-slime2) 0))
(slime2-real-y
(slime-volleyball-training-quantize
(slime-volleyball-slime-y slime-volleyball-slime2) 0))
(slime2-x (slime-volleyball-training-quantize slime2-real-x 0))
(slime2-y (slime-volleyball-training-quantize slime2-real-y 0))
(slime2-v-x (slime-volleyball-training-quantize
(slime-volleyball-slime-v-x slime-volleyball-slime2) 2))
(slime2-v-y (slime-volleyball-training-quantize
(slime-volleyball-slime-v-y-f slime-volleyball-slime2)
2)))
(format (concat "%s,"
"%0.0f,%0.0f,%0.2f,%0.2f,"
"%0.0f,%0.0f,%0.2f,%0.2f,"
"%0.0f,%0.0f,%0.2f,%0.2f")
(equal slime-volleyball-serving-slime slime-volleyball-slime2)
ball-x ball-y ball-v-x ball-v-y
slime1-x slime1-y slime1-v-x slime1-v-y
slime2-x slime2-y slime2-v-x slime2-v-y)))
(defun slime-volleyball-training-slime-controller ()
(let* ((situation (slime-volleyball-training-hash-situation))
(tallies (gethash situation
slime-volleyball-training-slime-strategy
(list (list 1 1)
(list 1 1)
(list 1 1)
(list 1 1)
(list 1 1))))
(best-move (slime-volleyball-best-move tallies)))
(push (list situation (car best-move)) slime-volleyball-moves-list)
(funcall (cadr best-move) slime-volleyball-slime2)))
(defun slime-volleyball-training-slime-updater (point)
(let ((index (if point 0 1))
item value)
(while (setq item (pop slime-volleyball-moves-list))
(setq value (gethash (car item) slime-volleyball-training-slime-strategy))
(when (not value)
(puthash (car item)
(list (list 1 1)
(list 1 1)
(list 1 1)
(list 1 1)
(list 1 1))
slime-volleyball-training-slime-strategy)
(setq value (gethash
(car item) slime-volleyball-training-slime-strategy)))
(setf (elt (elt value (cadr item)) index)
(1+ (elt (elt value (cadr item)) index))))
(setq slime-volleyball-training-frame-count 0)))
(defun slime-volleyball-eval-god-mode-variables ()
(when slime-volleyball-god-mode
(let ((debug-on-error nil))
(ignore-errors
(with-current-buffer "slime-volleyball.el"
(let (start function-end)
(save-excursion
(goto-char (point-min))
(search-forward-regexp
"^(defun slime-volleyball-initialize-god-mode-globals"
(point-max))
(goto-char (match-beginning 0))
(forward-sexp)
(setq function-end (point))
(backward-sexp)
(while (< (point) (- function-end 1))
(search-forward-regexp "(set")
(setq start (match-beginning 0))
(goto-char (match-beginning 0))
(forward-sexp)
(eval-region start (point))))))))))
(defun slime-volleyball-training-mode ()
(define-key slime-volleyball-mode-map
(kbd "<left>")
(lambda ()
(interactive)
(slime-volleyball-slime2-left)
(push (list (slime-volleyball-training-hash-situation) 0)
slime-volleyball-moves-list)))
(define-key slime-volleyball-mode-map
(kbd "<right>")
(lambda () (interactive)
(slime-volleyball-slime2-right)
(push (list (slime-volleyball-training-hash-situation) 1)
slime-volleyball-moves-list)))
(define-key slime-volleyball-mode-map
(kbd "<up>")
(lambda () (interactive)
(slime-volleyball-slime2-jump)
(push (list (slime-volleyball-training-hash-situation) 2)
slime-volleyball-moves-list)))
(define-key slime-volleyball-mode-map
(kbd "<down>")
(lambda () (interactive)
(slime-volleyball-slime2-stop)
(push (list (slime-volleyball-training-hash-situation) 3)
slime-volleyball-moves-list)))
(setq slime-volleyball-training-mode t)
(setq slime-volleyball-slime2 slime-volleyball-training-slime)
(slime-volleyball-unpause))
(defun slime-volleyball-two-player-mode ()
(define-key slime-volleyball-mode-map
(kbd "<left>")
(lambda () (interactive) (slime-volleyball-slime2-left)))
(define-key slime-volleyball-mode-map
(kbd "<right>")
(lambda () (interactive) (slime-volleyball-slime2-right)))
(define-key slime-volleyball-mode-map
(kbd "<up>")
(lambda () (interactive) (slime-volleyball-slime2-jump)))
(define-key slime-volleyball-mode-map
(kbd "<down>")
(lambda () (interactive) (slime-volleyball-slime2-stop)))
(setf (slime-volleyball-slime-controller slime-volleyball-slime2) nil)
(setf (slime-volleyball-slime-color slime-volleyball-slime2) "Pink")
(setq slime-volleyball-two-players t)
(slime-volleyball-unpause))
(defun slime-volleyball-initialize-keymap ()
(setq slime-volleyball-mode-map
(let ((map (make-keymap)))
(set-keymap-parent map special-mode-map)
(define-key map (kbd "a")
(lambda () (interactive) (slime-volleyball-slime1-left)))
(define-key map (kbd "C-b")
(lambda () (interactive) (slime-volleyball-slime1-left)))
(define-key map (kbd "<left>")
(lambda () (interactive) (slime-volleyball-slime1-left)))
(define-key map (kbd "d")
(lambda () (interactive) (slime-volleyball-slime1-right)))
(define-key map (kbd "C-f")
(lambda () (interactive) (slime-volleyball-slime1-right)))
(define-key map (kbd "<right>")
(lambda () (interactive) (slime-volleyball-slime1-right)))
(define-key map (kbd "w")
(lambda () (interactive) (slime-volleyball-slime1-jump)))
(define-key map (kbd "C-p")
(lambda () (interactive) (slime-volleyball-slime1-jump)))
(define-key map (kbd "<up>")
(lambda () (interactive) (slime-volleyball-slime1-jump)))
(define-key map (kbd "s")
(lambda () (interactive) (slime-volleyball-slime1-stop)))
(define-key map (kbd "C-n")
(lambda () (interactive) (slime-volleyball-slime1-stop)))
(define-key map (kbd "<down>")
(lambda () (interactive) (slime-volleyball-slime1-stop)))
(define-key map (kbd "G")
(lambda () (interactive) (slime-volleyball-toggle-god-mode)))
(define-key map (kbd "SPC")
(lambda () (interactive) (slime-volleyball-unpause)))
(define-key map (kbd "2")
(lambda () (interactive) (slime-volleyball-two-player-mode)))
(define-key map (kbd "t")
(lambda () (interactive) (slime-volleyball-training-mode)))
(define-key map (kbd "p")
(lambda () (interactive) (slime-volleyball-toggle-pause)))
(define-key map (kbd "q") 'slime-volleyball-quit)
(define-key map (kbd "<f8>")
(lambda () (interactive) (setq slime-volleyball-advance-frame t)))
(define-key map (kbd "<f9>")
(lambda () (interactive)
(setq slime-volleyball-frame-by-frame-mode
(not slime-volleyball-frame-by-frame-mode))))
map)))
;; Something fun to try in god mode.
(defun slime-volleyball-initialize-god-mode-globals ()
;; Scene.
(setq slime-volleyball-scene-width 1100)
(setq slime-volleyball-scene-height 450)
(setq slime-volleyball-floor-height 100)
(setq slime-volleyball-scene-total-height
(+ slime-volleyball-scene-height slime-volleyball-floor-height))
(setq slime-volleyball-net-height 100)
(setq slime-volleyball-net-x (- (/ slime-volleyball-scene-width 2)
(/ slime-volleyball-net-width 2)))
(setq slime-volleyball-net-y (- slime-volleyball-scene-height
slime-volleyball-net-height))
;; Points.
(setq slime-volleyball-point-circles-start-x 45)
(setq slime-volleyball-point-circles-y 40)
(setq slime-volleyball-point-circles-radius 22)
(setq slime-volleyball-points-to-win 5)
(setq slime-volleyball-slime-radius 90)
(setq slime-volleyball-ball-radius
(round (* 0.25 slime-volleyball-slime-radius)))
;; Gravity.
(setq slime-volleyball-force-y 4)
;; Chameleon slime.
(when slime-volleyball-god-mode
(setf (slime-volleyball-slime-color slime-volleyball-slime1)
(elt '("Maroon" "Yellow" "Turquoise")
(setq slime-volleyball-color-index
(mod (1+ slime-volleyball-color-index) 3))))))
(defun slime-volleyball-initialize-globals ()
;; Net.
;; This isn't a God mode variable because the intersection calculation uses
;; an idealized 1 pixel wide net width.
(setq slime-volleyball-net-width 20)
(setq slime-volleyball-god-mode nil)
(setq slime-volleyball-color-index 0)
(slime-volleyball-initialize-god-mode-globals)
;; Ball.
(setq slime-volleyball-ball-x 800)
(setq slime-volleyball-ball-y 790)
(setq slime-volleyball-ball-bouncy-bouncy nil)
(setq slime-volleyball-point-scored nil)
(setq slime-volleyball-quitting nil)
;; First level is level 0.
(setq slime-volleyball-level -1)
(setq slime-volleyball-play-ending nil)
(setq slime-volleyball-two-players nil)
(setq slime-volleyball-one-player-beat-the-game nil)
(setq slime-volleyball-game-over nil)
(setq slime-volleyball-advance-frame nil)
(setq slime-volleyball-training-mode nil)
(setq slime-volleyball-moves-list nil)
;; Slime controller.
(setq slime-volleyball-blue-slime-serving nil)
(setq slime-volleyball-blue-slime-orig-x 0)
(setq slime-volleyball-paused t)
(setq slime-volleyball-message nil)
(setq slime-volleyball-unpause-function nil)
(setq slime-volleyball-frame-by-frame-mode nil)
(slime-volleyball-initialize-keymap)
(setq slime-volleyball-jumping nil)
(setq slime-volleyball-time-delta 0.6)
(setq slime-volleyball-slime1
(make-slime-volleyball-slime
:player 1
:jumping nil
:points 0
;; Human.
:controller nil
:updater nil
:speed 10
:v-y-i 0
:v-y-f 0
:v-x 0
:x 0
:y slime-volleyball-scene-height
:delta-y 0
:eye-center-x 126
:eye-center-y -53
:eye-radius 23
:pupil-center-x 126
:pupil-center-y -53
:pupil-radius 7
:color "Maroon"))
(setq slime-volleyball-serving-slime slime-volleyball-slime1)
(setq slime-volleyball-grey-slime
(make-slime-volleyball-slime
:player 2
:jumping nil
:points 0
:controller 'slime-volleyball-grey-slime-controller
:updater nil
:speed 10
:v-y-i 0
:v-y-f 0
:v-x 0
:x 400
:y slime-volleyball-scene-height
:delta-y 0
:eye-center-x 54
:eye-center-y -53
:eye-radius 23
:pupil-center-x 54
:pupil-center-y -53
:pupil-radius 7
:color "Grey"))
(setq slime-volleyball-blue-slime
(make-slime-volleyball-slime
:player 2
:jumping nil
:points 0
:controller 'slime-volleyball-blue-slime-controller
:updater nil
:speed 10
:v-y-i 0
:v-y-f 0
:v-x 0
:x 400
:y slime-volleyball-scene-height
:delta-y 0
:eye-center-x 54
:eye-center-y -53
:eye-radius 23
:pupil-center-x 54
:pupil-center-y -53
:pupil-radius 7
:color "Blue"))
(setq slime-volleyball-green-slime
(make-slime-volleyball-slime
:player 2
:jumping nil
:points 0
:controller 'slime-volleyball-green-slime-controller
:updater nil
:speed 10
:v-y-i 0
:v-y-f 0
:v-x 0
:x 400
:y slime-volleyball-scene-height
:delta-y 0
:eye-center-x 54
:eye-center-y -53
:eye-radius 23
:pupil-center-x 54
:pupil-center-y -53
:pupil-radius 7
:color "Green"))
(setq slime-volleyball-training-slime
(make-slime-volleyball-slime
:player 2
:jumping nil
:points 0
:controller 'slime-volleyball-training-slime-controller
:updater 'slime-volleyball-training-slime-updater
:speed 10
:v-y-i 0
:v-y-f 0
:v-x 0
:x 400
:y slime-volleyball-scene-height
:delta-y 0
:eye-center-x 54
:eye-center-y -53
:eye-radius 23
:pupil-center-x 54
:pupil-center-y -53
:pupil-radius 7
:color "Red"))
(setq slime-volleyball-training-slime-strategy (make-hash-table :test 'equal))
(setq slime-volleyball-training-frame-count 0)
(setq slime-volleyball-opponents
(list slime-volleyball-green-slime
slime-volleyball-blue-slime
slime-volleyball-grey-slime))
(setq slime-volleyball-last-level (1- (length slime-volleyball-opponents)))
(setq slime-volleyball-title-screen
(create-image
(expand-file-name "title-screen.svg"
(file-name-directory
(symbol-file 'slime-volleyball-init)))))
(setq slime-volleyball-template-header
(concat "<svg width=\"%d\" height=\"%d\" viewBox=\"0 0 %d %d\""
" xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\">")
slime-volleyball-template-footer "</svg>"
slime-volleyball-template-slime
(concat
"<g id=\"slime1\" transform=\"translate(%d,%d)\" >"
"<path d=\"M 0,0 a %d,%d 0 0 1 %d,0 z\""
" fill=\"%s\" stroke-width=\"0\" />"
"<circle cx=\"%d\" cy=\"%d\" r=\"%d\" fill=\"white\" />"
"<circle cx=\"%d\" cy=\"%d\" r=\"%d\" fill=\"black/\" />"
"</g>")
slime-volleyball-template-ball
(concat
"<circle cx=\"%d\" cy=\"%d\" r=\"%d\""
" fill=\"white\" stroke-width=\"0\" />")
slime-volleyball-template-dot
(concat
"<circle cx=\"%d\" cy=\"%d\" r=\"5\""
" fill=\"red\" stroke-width=\"0\" />")
slime-volleyball-template-point-circle
(concat
"<circle cx=\"%d\" cy=\"%d\" r=\"%d\""
" fill=\"white\" fill-opacity=\"%f\" stroke=\"white\""
" stroke-width=\"2\" />")
slime-volleyball-template-net
(concat
"<rect x=\"%d\" y=\"%d\" width=\"%d\" height=\"%d\""
" fill=\"white\" stroke-width=\"0\" />")
slime-volleyball-template-sky
"<rect x=\"0\" y=\"0\" width=\"%d\" height=\"%d\" fill=\"#0088ee\" />"
slime-volleyball-template-ground
(concat
"<rect x=\"0\" y=\"%d\" width=\"%d\" height=\"%d\""
" fill=\""
(if slime-volleyball-beach-mode "#EEE8AA" "#778899")
"\" />")
slime-volleyball-template-message-box-start
(concat
"<defs>"
"<filter id=\"AFilter\" x=\"-10%\" width=\"120%\" y=\"-50%\""
" height=\"250%\" >"
"<!-- Definition of filter goes here -->"
"<feFlood flood-color=\"#444444\" flood-opacity=\"1.0\" />"
"</filter>"
"</defs>"
"<text x=\"50%\" y=\"30%\" fill=\"white\""
" font-family=\"Liberation Sans\""
" font-size=\"45\""
" text-anchor=\"middle\" style=\"filter:url(#AFilter)\">")
slime-volleyball-template-message-box-middle
(concat
"</text>"
"<text x=\"50%\" y=\"30%\" fill=\"white\" font-size=\"45\""
" font-family=\"Liberation Sans\""
" dy=\"0.2em\" text-anchor=\"middle\">")
slime-volleyball-template-message-box-end
"</text>")
(slime-volleyball-initialize-ending-variables))
(defun slime-volleyball-slime-left (slime)
(unless slime-volleyball-paused
(setf (slime-volleyball-slime-v-x slime)
(- (slime-volleyball-slime-speed slime)))))
(defun slime-volleyball-slime-stop (slime)
(unless slime-volleyball-paused
(setf (slime-volleyball-slime-v-x slime) 0)))
(defun slime-volleyball-slime-right (slime)
(unless slime-volleyball-paused
(setf (slime-volleyball-slime-v-x slime)
(slime-volleyball-slime-speed slime))))
(defun slime-volleyball-slime-jump (slime)
(unless slime-volleyball-paused
(if (not (slime-volleyball-slime-jumping slime))
(progn
(setf (slime-volleyball-slime-jumping slime) t)
(setf (slime-volleyball-slime-v-y-i slime) -30)
(setf (slime-volleyball-slime-v-y-f slime) -30)))))
;; Do not change the slime's movement.
(defun slime-volleyball-slime-none (slime))
(defun slime-volleyball-init (slime)
(setf (slime-volleyball-slime-x slime-volleyball-slime1)
(- (/ slime-volleyball-scene-width 4) slime-volleyball-slime-radius))
(setf (slime-volleyball-slime-y slime-volleyball-slime1)
slime-volleyball-scene-height)
(setf (slime-volleyball-slime-v-x slime-volleyball-slime1) 0)
(setf (slime-volleyball-slime-x slime-volleyball-slime2)
(- (* 3 (/ slime-volleyball-scene-width 4))
slime-volleyball-slime-radius))
(setf (slime-volleyball-slime-y slime-volleyball-slime2)
slime-volleyball-scene-height)
(setf (slime-volleyball-slime-v-x slime-volleyball-slime2) 0)
(setq slime-volleyball-ball-x (+ (slime-volleyball-slime-x slime)
slime-volleyball-slime-radius)
slime-volleyball-ball-y (- slime-volleyball-scene-height
(* 2.5 slime-volleyball-slime-radius))
slime-volleyball-ball-velocity-x 0
slime-volleyball-ball-velocity-y 0
slime-volleyball-prev-frame-ball-x (+ (slime-volleyball-slime-x slime)
slime-volleyball-slime-radius)
slime-volleyball-prev-frame-ball-y 100))
(defun slime-volleyball-warn (warning-message)
(message "slime-volleyball warning: %s" warning-message))
(defun slime-volleyball-arc-circle-overlap (x1 y1 r1 x2 y2 r2)
(let* ((d-x (abs (- x1 x2)))
(d-y (abs (- y1 y2)))
(distance (sqrt (+ (expt d-x 2)
(expt d-y 2)))))
(if (< distance (+ r1 r2))
(progn
(when (< (abs distance) 0.1)
(slime-volleyball-warn "Divide-by-zero danger 1"))
(list (/ d-x distance) (/ d-y distance)))
nil)))
(defun slime-volleyball-point-circles-left ()
(let ((circles " "))
(dotimes (i slime-volleyball-points-to-win)
(setq circles
(concat circles
(format
slime-volleyball-template-point-circle
(+ slime-volleyball-point-circles-start-x
(* i (* 3 slime-volleyball-point-circles-radius)))
slime-volleyball-point-circles-y
slime-volleyball-point-circles-radius
(if (>= (slime-volleyball-slime-points
slime-volleyball-slime1) (1+ i))
1.0
0.0)))))
circles))
(defun slime-volleyball-point-circles-right ()
(let ((circles " "))
(dotimes (i slime-volleyball-points-to-win)
(setq circles
(concat circles
(format
slime-volleyball-template-point-circle
(- slime-volleyball-scene-width
slime-volleyball-point-circles-start-x
(* i (* 3 slime-volleyball-point-circles-radius)))
slime-volleyball-point-circles-y
slime-volleyball-point-circles-radius
(if (>= (slime-volleyball-slime-points
slime-volleyball-slime2) (1+ i))
1.0
0.0)))))
circles))
(defun slime-volleyball-header (width height)
(format slime-volleyball-template-header
width height
width height))
(defun slime-volleyball-footer ()
slime-volleyball-template-footer)
(defun slime-volleyball-slime (slime x y)
(format slime-volleyball-template-slime
x y slime-volleyball-slime-radius slime-volleyball-slime-radius
(* 2 slime-volleyball-slime-radius) (slime-volleyball-slime-color
slime)
(slime-volleyball-slime-eye-center-x slime)
(slime-volleyball-slime-eye-center-y slime)
(slime-volleyball-slime-eye-radius slime)
(slime-volleyball-slime-pupil-center-x slime)
(slime-volleyball-slime-pupil-center-y slime)
(slime-volleyball-slime-pupil-radius slime)))
(defun slime-volleyball-ball (x y)
(format slime-volleyball-template-ball
x y slime-volleyball-ball-radius))
(defun slime-volleyball-net ()
(format slime-volleyball-template-net
slime-volleyball-net-x slime-volleyball-net-y
slime-volleyball-net-width slime-volleyball-net-height))
(defun slime-volleyball-sky ()
(format slime-volleyball-template-sky slime-volleyball-scene-width
slime-volleyball-scene-height))
(defun slime-volleyball-ground ()
(format slime-volleyball-template-ground slime-volleyball-scene-height
slime-volleyball-scene-width slime-volleyball-floor-height)
)
(defun slime-volleyball-message-box (message-string)
(concat slime-volleyball-template-message-box-start
message-string
slime-volleyball-template-message-box-middle
message-string
slime-volleyball-template-message-box-end))
(defun slime-volleyball-markup ()
(concat (format slime-volleyball-template-dot
slime-volleyball-prev-frame-ball-x
slime-volleyball-prev-frame-ball-y)
(format slime-volleyball-template-dot
slime-volleyball-ball-x
slime-volleyball-ball-y)
(format slime-volleyball-template-dot x-f y-f)))
(defun slime-volleyball-set-scene ()
(setq slime-volleyball-scene
(concat
(slime-volleyball-header slime-volleyball-scene-width
slime-volleyball-scene-total-height)
(slime-volleyball-sky)
(slime-volleyball-ground)
(when slime-volleyball-message
(slime-volleyball-message-box slime-volleyball-message))
(slime-volleyball-point-circles-left)
(slime-volleyball-point-circles-right)
(slime-volleyball-slime slime-volleyball-slime1
(slime-volleyball-slime-x
slime-volleyball-slime1)
(slime-volleyball-slime-y
slime-volleyball-slime1))
(slime-volleyball-slime slime-volleyball-slime2
(slime-volleyball-slime-x
slime-volleyball-slime2)
(slime-volleyball-slime-y
slime-volleyball-slime2))
(slime-volleyball-ball slime-volleyball-ball-x slime-volleyball-ball-y)
(slime-volleyball-net)
;; Debugging.
;; (slime-volleyball-markup)
(slime-volleyball-footer))))
(defun slime-volleyball-initialize-ending-variables ()
(setq slime-volleyball-offset 3)
(setq slime-volleyball-ending-rate 10)
(setq slime-volleyball-ending-num 0)
(setq slime-volleyball-endvar "<g
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