Mercurial > cortex

     1 #+title: Helper Utilities

     2 #+author: Robert McIntyre

     3 #+email: rlm@mit.edu

     4 #+description: Simulating senses for AI research using JMonkeyEngine3

     5 #+SETUPFILE: ../../aurellem/org/setup.org

     6 #+INCLUDE: ../../aurellem/org/level-0.org

     7 #+babel: :mkdirp yes :noweb yes :exports both

     8 

     9 ** Imports

    10 jMonkeyEngine has a plethora of classes which can be overwhelming at

    11 first. So that I one can get right to coding, it's good to take the

    12 time right now and make a "import all" function which brings in all of

    13 the important jme3 classes. Once I'm happy with the general structure

    14 of a namespace I can deal with importing only the classes it actually

    15 needs.

    16 

    17 #+srcname: import

    18 #+begin_src clojure :results silent

    19 (ns cortex.import

    20   (:require swank.util.class-browse))

    21 

    22 (defn permissive-import

    23   [classname]

    24   (eval `(try (import '~classname)

    25               (catch java.lang.Exception e#

    26                 (println "couldn't import " '~classname))))

    27   classname)

    28 

    29 (defn jme-class? [classname]

    30   (and

    31    (.startsWith classname "com.jme3.")

    32    ;; Don't import the Lwjgl stuff since it can throw exceptions

    33    ;;  upon being loaded.

    34    (not (re-matches #".*Lwjgl.*" classname))))

    35 

    36 (defn jme-classes

    37   "returns a list of all jme3 classes"

    38   []

    39   (filter

    40    jme-class?

    41    (map :name

    42         swank.util.class-browse/available-classes)))

    43   

    44 (defn mega-import-jme3

    45   "Import ALL the jme classes. For REPL use."

    46   []

    47   (doall

    48    (map (comp permissive-import symbol) (jme-classes))))

    49 #+end_src  

    50 

    51 The =mega-import-jme3= is quite usefull for debugging purposes since

    52 it allows completion for almost all of JME's classes.

    53 

    54 Out of curiousity, let's see just how many classes =mega-import-jme3=

    55 imports:

    56 

    57 #+begin_src clojure :exports both

    58 (clojure.core/count (cortex.import/jme-classes))

    59 #+end_src

    60 

    61 #+results:

    62 : 955

    63 

    64 ** Simplification

    65 #+srcname: world-view

    66 #+begin_src clojure :results silent

    67 (in-ns 'cortex.world)

    68 

    69 (defprotocol Viewable

    70   (view [something]))

    71 

    72 (extend-type com.jme3.scene.Geometry

    73   Viewable

    74   (view [geo]

    75 	(view (doto (Node.)(.attachChild geo)))))

    76 

    77 (extend-type com.jme3.scene.Node

    78   Viewable

    79   (view [node]

    80 	(.start

    81 	 (world node

    82 		{}

    83 		(fn [world]

    84 		  (.enableDebug 

    85 		   (.getPhysicsSpace

    86 		    (.getState

    87 		     (.getStateManager world)

    88 		     BulletAppState))

    89 		   (asset-manager))

    90 		  (set-gravity* world Vector3f/ZERO)

    91 ;;		  (set-gravity* world (Vector3f. 0 (float -0.4) 0))

    92 		  (let [sun (doto (DirectionalLight.)

    93 			      (.setDirection (.normalizeLocal (Vector3f. 1 0 -2)))

    94 			      (.setColor ColorRGBA/White))]

    95 		    (.addLight (.getRootNode world) sun)))

    96 		no-op))))

    97 

    98 (defn position-camera [game]

    99   (doto (.getCamera game)

   100     (.setLocation (Vector3f. 0 6 6))

   101     (.lookAt Vector3f/ZERO (Vector3f. 0 1 0))))

   102 

   103 #+end_src

   104 

   105 Here I make the =Viewable= protocol and extend it to JME's types.  Now

   106 hello-world can be written as easily as:

   107 

   108 #+begin_src clojure :results silent

   109 (cortex.world/view (cortex.world/box))

   110 #+end_src
author	Robert McIntyre <rlm@mit.edu>
date	Sun, 23 Oct 2011 23:54:26 -0700
parents
children	e965675ec4d0