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split off the rest of cortex.org
author Robert McIntyre <rlm@mit.edu>
date Sun, 23 Oct 2011 23:54:26 -0700
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children e965675ec4d0
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rlm@23 1 #+title: Helper Utilities
rlm@23 2 #+author: Robert McIntyre
rlm@23 3 #+email: rlm@mit.edu
rlm@23 4 #+description: Simulating senses for AI research using JMonkeyEngine3
rlm@23 5 #+SETUPFILE: ../../aurellem/org/setup.org
rlm@23 6 #+INCLUDE: ../../aurellem/org/level-0.org
rlm@23 7 #+babel: :mkdirp yes :noweb yes :exports both
rlm@23 8
rlm@23 9 ** Imports
rlm@23 10 jMonkeyEngine has a plethora of classes which can be overwhelming at
rlm@23 11 first. So that I one can get right to coding, it's good to take the
rlm@23 12 time right now and make a "import all" function which brings in all of
rlm@23 13 the important jme3 classes. Once I'm happy with the general structure
rlm@23 14 of a namespace I can deal with importing only the classes it actually
rlm@23 15 needs.
rlm@23 16
rlm@23 17 #+srcname: import
rlm@23 18 #+begin_src clojure :results silent
rlm@23 19 (ns cortex.import
rlm@23 20 (:require swank.util.class-browse))
rlm@23 21
rlm@23 22 (defn permissive-import
rlm@23 23 [classname]
rlm@23 24 (eval `(try (import '~classname)
rlm@23 25 (catch java.lang.Exception e#
rlm@23 26 (println "couldn't import " '~classname))))
rlm@23 27 classname)
rlm@23 28
rlm@23 29 (defn jme-class? [classname]
rlm@23 30 (and
rlm@23 31 (.startsWith classname "com.jme3.")
rlm@23 32 ;; Don't import the Lwjgl stuff since it can throw exceptions
rlm@23 33 ;; upon being loaded.
rlm@23 34 (not (re-matches #".*Lwjgl.*" classname))))
rlm@23 35
rlm@23 36 (defn jme-classes
rlm@23 37 "returns a list of all jme3 classes"
rlm@23 38 []
rlm@23 39 (filter
rlm@23 40 jme-class?
rlm@23 41 (map :name
rlm@23 42 swank.util.class-browse/available-classes)))
rlm@23 43
rlm@23 44 (defn mega-import-jme3
rlm@23 45 "Import ALL the jme classes. For REPL use."
rlm@23 46 []
rlm@23 47 (doall
rlm@23 48 (map (comp permissive-import symbol) (jme-classes))))
rlm@23 49 #+end_src
rlm@23 50
rlm@23 51 The =mega-import-jme3= is quite usefull for debugging purposes since
rlm@23 52 it allows completion for almost all of JME's classes.
rlm@23 53
rlm@23 54 Out of curiousity, let's see just how many classes =mega-import-jme3=
rlm@23 55 imports:
rlm@23 56
rlm@23 57 #+begin_src clojure :exports both
rlm@23 58 (clojure.core/count (cortex.import/jme-classes))
rlm@23 59 #+end_src
rlm@23 60
rlm@23 61 #+results:
rlm@23 62 : 955
rlm@23 63
rlm@23 64 ** Simplification
rlm@23 65 #+srcname: world-view
rlm@23 66 #+begin_src clojure :results silent
rlm@23 67 (in-ns 'cortex.world)
rlm@23 68
rlm@23 69 (defprotocol Viewable
rlm@23 70 (view [something]))
rlm@23 71
rlm@23 72 (extend-type com.jme3.scene.Geometry
rlm@23 73 Viewable
rlm@23 74 (view [geo]
rlm@23 75 (view (doto (Node.)(.attachChild geo)))))
rlm@23 76
rlm@23 77 (extend-type com.jme3.scene.Node
rlm@23 78 Viewable
rlm@23 79 (view [node]
rlm@23 80 (.start
rlm@23 81 (world node
rlm@23 82 {}
rlm@23 83 (fn [world]
rlm@23 84 (.enableDebug
rlm@23 85 (.getPhysicsSpace
rlm@23 86 (.getState
rlm@23 87 (.getStateManager world)
rlm@23 88 BulletAppState))
rlm@23 89 (asset-manager))
rlm@23 90 (set-gravity* world Vector3f/ZERO)
rlm@23 91 ;; (set-gravity* world (Vector3f. 0 (float -0.4) 0))
rlm@23 92 (let [sun (doto (DirectionalLight.)
rlm@23 93 (.setDirection (.normalizeLocal (Vector3f. 1 0 -2)))
rlm@23 94 (.setColor ColorRGBA/White))]
rlm@23 95 (.addLight (.getRootNode world) sun)))
rlm@23 96 no-op))))
rlm@23 97
rlm@23 98 (defn position-camera [game]
rlm@23 99 (doto (.getCamera game)
rlm@23 100 (.setLocation (Vector3f. 0 6 6))
rlm@23 101 (.lookAt Vector3f/ZERO (Vector3f. 0 1 0))))
rlm@23 102
rlm@23 103 #+end_src
rlm@23 104
rlm@23 105 Here I make the =Viewable= protocol and extend it to JME's types. Now
rlm@23 106 hello-world can be written as easily as:
rlm@23 107
rlm@23 108 #+begin_src clojure :results silent
rlm@23 109 (cortex.world/view (cortex.world/box))
rlm@23 110 #+end_src