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GNU GENERAL PUBLIC LICENSE # GNU GENERAL PUBLIC LICENSE
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{description}
Copyright (C) {year} {fullname}
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Also add information on how to contact you by electronic and paper mail.
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Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
{signature of Ty Coon}, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
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consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License.

24
README.md
View file

@ -2,17 +2,6 @@
Core cellular automaton engine for MicroWorld. Core cellular automaton engine for MicroWorld.
## Part of the overall MicroWorld system
While this code works and is interesting on its own, you also need at least
[mw-parser](https://github.com/simon-brooke/mw-parser) and
[mw-ui](https://github.com/simon-brooke/mw-ui). There will be other
modules in due course.
You can see MicroWorld in action [here](http://www.journeyman.cc/microworld/) -
but please don't be mean to my poor little server. If you want to run big maps
or complex rule-sets, please run it on your own machines.
## Usage ## Usage
Primary entry points are make-world and run-world, both in mw-engine.core. See Primary entry points are make-world and run-world, both in mw-engine.core. See
@ -21,19 +10,6 @@ using
lein marg lein marg
To build the whole system, place all MicroWorld projects in a common directory,
and from that directory run *buildall.sh*. Alternatively, in each MicroWorld
project directory, run
lein clean
lein compile
lein marg
lein install
and then from the mw-ui directory, run
lein ring server
## License ## License
Copyright © 2014 Simon Brooke Copyright © 2014 Simon Brooke

9
buildall.sh
View file

@ -6,7 +6,7 @@
# WARNING: The regexps in this are fair awfy bruckle. Edit with care. # WARNING: The regexps in this are fair awfy bruckle. Edit with care.
# Simon Broooke <simon@journeyman.cc> # Simon Broooke <simon@jasmine.org.uk>
# Variable and glag initialisation # Variable and glag initialisation
archive=FALSE archive=FALSE
@ -76,7 +76,6 @@ then
-build Build all components and commit to master. -build Build all components and commit to master.
-email [ADDRESS] Your email address, to be recorded in the build signature. -email [ADDRESS] Your email address, to be recorded in the build signature.
-fullname [NAME] Your full name, to be recorded in the build signature. -fullname [NAME] Your full name, to be recorded in the build signature.
-pull Pull from remote git repository
-release [LABEL] Build all components, branch for release on old label, then -release [LABEL] Build all components, branch for release on old label, then
upversion to new LABEL and commit to master. upversion to new LABEL and commit to master.
-trial Trial build only, do not commit. -trial Trial build only, do not commit.
@ -99,9 +98,6 @@ do
-f|-fullname) -f|-fullname)
shift; shift;
fullname=$1;; fullname=$1;;
-p|-pull)
# pull from remote Git origin
git pull origin master;;
-r|-release) -r|-release)
# release is branch a release and upversion to new label # release is branch a release and upversion to new label
shift; shift;
@ -112,6 +108,9 @@ do
echo "Release flagged, but no release tag supplied" 1>&2; echo "Release flagged, but no release tag supplied" 1>&2;
exit 1; exit 1;
fi;; fi;;
-p|-pull)
# pull from remote Git origin
git pull origin master;;
-t|-trial) -t|-trial)
trial="TRUE";; trial="TRUE";;
-w|-webapps) -w|-webapps)

9
project.clj
View file

@ -1,4 +1,4 @@
(defproject mw-engine "0.1.5-SNAPSHOT" (defproject mw-engine "0.1.3"
:description "Cellular automaton world builder." :description "Cellular automaton world builder."
:url "http://www.journeyman.cc/microworld/" :url "http://www.journeyman.cc/microworld/"
:manifest { :manifest {
@ -11,11 +11,10 @@
:jvm-opts ["-Xmx4g"] :jvm-opts ["-Xmx4g"]
:license {:name "GNU General Public License v2" :license {:name "GNU General Public License v2"
:url "http://www.gnu.org/licenses/gpl-2.0.html"} :url "http://www.gnu.org/licenses/gpl-2.0.html"}
:plugins [[lein-marginalia "0.7.1"]] :plugins [[lein-marginalia "0.7.1"]
:dependencies [[org.clojure/clojure "1.6.0"] [lein-gorilla "0.3.2"]]
:dependencies [[org.clojure/clojure "1.5.1"]
[org.clojure/math.combinatorics "0.0.7"] [org.clojure/math.combinatorics "0.0.7"]
[org.clojure/tools.trace "0.7.8"] [org.clojure/tools.trace "0.7.8"]
[org.clojure/tools.namespace "0.2.4"]
[hiccup "1.0.5"]
[net.mikera/imagez "0.3.1"] [net.mikera/imagez "0.3.1"]
[fivetonine/collage "0.2.0"]]) [fivetonine/collage "0.2.0"]])

20
src/mw_engine/core.clj
View file

@ -60,7 +60,7 @@
(try (try
(merge (merge
(apply-rules world cell rules) (apply-rules world cell rules)
{:generation (+ (get-int-or-zero cell :generation) 1)}) {:generation (+ (or (:generation cell) 0) 1)})
(catch Exception e (catch Exception e
(merge cell {:error (merge cell {:error
(format "%s at generation %d when in state %s" (format "%s at generation %d when in state %s"
@ -93,6 +93,24 @@
* `generations` an (integer) number of generations. * `generations` an (integer) number of generations.
Return the final generation of the world." Return the final generation of the world."
[world init-rules rules generations]
(let [state {:world (transform-world world init-rules) :rules rules}]
(:world
(last
(doall
(take generations
(iterate transform-world-state state)))))))
(defn run-world2
"Doesn't work yet"
[world init-rules rules generations]
(with-local-vars [r (ref (transform-world world init-rules))]
(dotimes [g generations]
(dosync
(ref-set r (transform-world (deref r) rules))))
(deref r)))
(defn run-world3
[world init-rules rules generations] [world init-rules rules generations]
(reduce (fn [world _iteration] (reduce (fn [world _iteration]
(transform-world world rules)) (transform-world world rules))

101
src/mw_engine/drainage.clj
View file

@ -3,14 +3,7 @@
(ns mw-engine.drainage (ns mw-engine.drainage
(:use mw-engine.utils (:use mw-engine.utils
mw-engine.world mw-engine.world))
mw-engine.core)
(:require [mw-engine.heightmap :as heightmap]))
(def ^:dynamic *sealevel* 10)
;; forward declaration of flow, to allow for a wee bit of mutual recursion.
(declare flow)
(defn rain-world (defn rain-world
"Simulate rainfall on this `world`. TODO: Doesn't really work just now - should "Simulate rainfall on this `world`. TODO: Doesn't really work just now - should
@ -20,98 +13,30 @@
(defn flow-contributors (defn flow-contributors
"Return a list of the cells in this `world` which are higher than this "Return a list of the cells in this `world` which are higher than this
`cell` and for which this cell is the lowest neighbour, or which are at the `cell` and for which this cell is the lowest neighbour"
same altitude and have greater flow" [world cell]
[cell world] (remove nil?
(filter #(map? %)
(map (map
(fn [n] (fn [n]
(cond (cond (= cell (get-least-cell (get-neighbours world n) :altitude)) n))
(= cell (get-least-cell (get-neighbours world n) :altitude)) n (get-neighbours-with-property-value world (:x cell) (:y cell) 1
(and (= (:altitude cell) (:altitude n)) :altitude
(> (or (:flow n) 0) (or (:flow cell) 0))) n)) (or (:altitude cell) 0) >))))
(get-neighbours-with-property-value
world (:x cell) (:y cell) 1 :altitude
(or (:altitude cell) 0) >=))))
(defn is-hollow (defn flow
"Detects point hollows - that is, individual cells all of whose neighbours
are higher. Return true if this `cell` has an altitude lower than any of
its neighbours in this `world`"
[world cell]
;; quicker to count the elements of the list and compare equality of numbers
;; than recursive equality check on members, I think. But worth benchmarking.
(let [neighbours (get-neighbours world cell)
altitude (get-int-or-zero cell :altitude)]
(= (count neighbours)
(count (get-neighbours-with-property-value
world (:x cell) (:y cell) 1 :altitude altitude >)))))
(defn flood-hollow
"Raise the altitude of a copy of this `cell` of this `world` to the altitude
of the lowest of its `neighbours`."
([world cell neighbours]
(let [lowest (get-least-cell neighbours :altitude)]
(merge cell {:state :water :altitude (:altitude lowest)})))
([world cell]
(flood-hollow world cell (get-neighbours world cell))))
(defn flood-hollows
"Flood all local hollows in this `world`. At this stage only floods single
cell hollows."
[world]
(map-world world
#(if (is-hollow %1 %2) (flood-hollow %1 %2) %2)))
(def max-altitude 255)
(defn flow-nr
"Experimental non recursive flow algorithm, needs to be run on a world as
many times as there are distinct altitude values. This algorithm works only
if applied sequentially from the highest altitude to the lowest, see
`flow-world-nr`."
[cell world]
(if (= (- max-altitude (get-int-or-zero cell :generation))
(get-int-or-zero cell :altitude))
(merge cell
{:flow (reduce +
(map
#(+ (get-int-or-zero % :rainfall)
(get-int-or-zero % :flow))
(flow-contributors cell world)))})))
(def flow
"Compute the total flow upstream of this `cell` in this `world`, and return a cell identical "Compute the total flow upstream of this `cell` in this `world`, and return a cell identical
to this one but having a value of its flow property set from that computation. The function is to this one but having a value of its flow property set from that computation.
memoised because the consequence of mapping a recursive function across an array is that many
cells will be revisited - potentially many times.
Flow comes from a higher cell to a lower only if the lower is the lowest neighbour of the higher." Flow comes from a higher cell to a lower only if the lower is the lowest neighbour of the higher."
(memoize [world cell]
(fn [cell world]
(cond
(not (nil? (:flow cell))) cell
(<= (or (:altitude cell) 0) *sealevel*) cell
true
(merge cell (merge cell
{:flow (+ (:rainfall cell) {:flow (+ (:rainfall cell)
(apply + (apply +
(map (fn [neighbour] (:flow (flow neighbour world))) (map (fn [neighbour] (:flow (flow world neighbour)))
(flow-contributors cell world))))}))))) (flow-contributors world cell))))}))
(defn flow-world-nr
"Experimental non-recursive flow-world algorithm"
[world]
(run-world world nil (list flow-nr) max-altitude))
(defn flow-world (defn flow-world
"Return a world like this `world`, but with cells tagged with the amount of "Return a world like this `world`, but with cells tagged with the amount of
water flowing through them." water flowing through them."
[world] [world]
(map-world (rain-world world) flow)) (map-world (rain-world world) flow))
(defn run-drainage
[hmap]
"Create a world from the heightmap `hmap`, rain on it, and then compute river
flows."
(flow-world (rain-world (flood-hollows (heightmap/apply-heightmap hmap)))))

9
src/mw_engine/heightmap.clj
View file

@ -6,13 +6,14 @@
(ns mw-engine.heightmap (ns mw-engine.heightmap
(:import [java.awt.image BufferedImage]) (:import [java.awt.image BufferedImage])
(:use mw-engine.utils (:use mw-engine.utils
mw-engine.world) mw-engine.world
mw-engine.drainage)
(:require [fivetonine.collage.util :as collage :only [load-image]] (:require [fivetonine.collage.util :as collage :only [load-image]]
[mikera.image.core :as imagez :only [filter-image get-pixels]] [mikera.image.core :as imagez :only [filter-image get-pixels]]
[mikera.image.filters :as filters])) [mikera.image.filters :as filters]))
(defn tag-property (defn- tag-property
"Set the value of this `property` of this cell from the corresponding pixel of this `heightmap`. "Set the value of this `property` of this cell from the corresponding pixel of this `heightmap`.
If the heightmap you supply is smaller than the world, this will break. If the heightmap you supply is smaller than the world, this will break.
@ -35,7 +36,7 @@
(get-int cell :x) (get-int cell :x)
(get-int cell :y)) 256))))}))) (get-int cell :y)) 256))))})))
(defn tag-gradient (defn- tag-gradient
"Set the `gradient` property of this `cell` of this `world` to the difference in "Set the `gradient` property of this `cell` of this `world` to the difference in
altitude between its highest and lowest neghbours." altitude between its highest and lowest neghbours."
[world cell] [world cell]
@ -53,7 +54,7 @@
[world] [world]
(map-world world tag-gradient)) (map-world world tag-gradient))
(defn tag-altitude (defn- tag-altitude
"Set the altitude of this cell from the corresponding pixel of this heightmap. "Set the altitude of this cell from the corresponding pixel of this heightmap.
If the heightmap you supply is smaller than the world, this will break. If the heightmap you supply is smaller than the world, this will break.

121
src/mw_engine/utils.clj
View file

@ -1,9 +1,8 @@
;; Utility functions needed by MicroWorld and, specifically, in the ;; Utility functions needed by MicroWorld and, specifically, in the interpretation of MicroWorld rule.
;; interpretation of MicroWorld rule.
(ns mw-engine.utils (ns mw-engine.utils
(:require (:require
;; [clojure.core.reducers :as r] [clojure.core.reducers :as r]
[clojure.math.combinatorics :as combo])) [clojure.math.combinatorics :as combo]))
(defn abs (defn abs
@ -14,28 +13,12 @@
* `n` a number, on the set of real numbers." * `n` a number, on the set of real numbers."
[n] [n]
(if (neg? n) (- 0 n) n)) (cond (neg? n) (- 0 n) true n))
(defn member? (defn member?
"True if elt is a member of col." "True if elt is a member of col."
[elt col] (some #(= elt %) col)) [elt col] (some #(= elt %) col))
(defn get-int-or-zero
"Return the value of this `property` from this `map` if it is a integer;
otherwise return zero."
[map property]
(let [value (map property)]
(if (integer? value) value 0)))
(defn init-generation
"Return a cell like this `cell`, but having a value for :generation, zero if
the cell passed had no integer value for generation, otherwise the value
taken from the cell passed. The `world` argument is present only for
consistency with the rule engine and is ignored."
[world cell]
(merge cell {:generation (get-int-or-zero cell :generation)}))
(defn in-bounds (defn in-bounds
"True if x, y are in bounds for this world (i.e., there is a cell at x, y) "True if x, y are in bounds for this world (i.e., there is a cell at x, y)
else false. else false.
@ -46,46 +29,16 @@
[world x y] [world x y]
(and (>= x 0)(>= y 0)(< y (count world))(< x (count (first world))))) (and (>= x 0)(>= y 0)(< y (count world))(< x (count (first world)))))
(defn map-world-n-n
"Wholly non-parallel map world implementation"
([world function]
(map-world-n-n world function nil))
([world function additional-args]
(into []
(map (fn [row]
(into [] (map
#(apply function
(cons world (cons % additional-args)))
row)))
world))))
(defn map-world-p-p
"Wholly parallel map world implementation"
([world function]
(map-world-p-p world function nil))
([world function additional-args]
(into []
(pmap (fn [row]
(into [] (pmap
#(apply function
(cons world (cons % additional-args)))
row)))
world))))
(defn map-world (defn map-world
"Apply this `function` to each cell in this `world` to produce a new world. "Apply this `function` to each cell in this `world` to produce a new world.
the arguments to the function will be the world, the cell, and any the arguments to the function will be the world, the cell, and any
`additional-args` supplied. Note that we parallel map over rows but `additional-args` supplied"
just map over cells within a row. That's because it isn't worth starting
a new thread for each cell, but there may be efficiency gains in
running rows in parallel."
([world function] ([world function]
(map-world world function nil)) (map-world world function nil))
([world function additional-args] ([world function additional-args]
(into [] (into [] ;; vectors are more efficient for scanning, which we do a lot.
(pmap (fn [row] (r/map (fn [row]
(into [] (map (into [] (r/map
#(apply function #(apply function
(cons world (cons % additional-args))) (cons world (cons % additional-args)))
row))) row)))
@ -123,41 +76,15 @@
[cell species] [cell species]
(get-int cell species)) (get-int cell species))
(def memo-get-neighbours
"Memoised get neighbours is more efficient when running deeply recursive
algorithms on the same world. But it's less efficient when running the
engine in its normal iterative style, because then we will rarely call
get naighbours on the same cell of the same world twice."
(memoize
(fn [world x y depth]
(remove nil?
(map #(get-cell world (first %) (first (rest %)))
(remove #(= % (list x y))
(combo/cartesian-product
(range (- x depth) (+ x depth 1))
(range (- y depth) (+ y depth 1)))))))))
(defn get-neighbours (defn get-neighbours
"Get the neighbours to distance depth of a cell in this world. "Get the neighbours to distance depth of the cell at x, y in this world.
Several overloads:
* `world` a world, as described in world.clj;
* `cell` a cell within that world
Gets immediate neighbours of the specified cell.
* `world` a world, as described in world.clj;
* `cell` a cell within that world
* `depth` an integer representing the depth to search from the
`cell`
Gets neighbours within the specified distance of the cell.
* `world` a world, as described in world.clj; * `world` a world, as described in world.clj;
* `x` an integer representing an x coordinate in that world; * `x` an integer representing an x coordinate in that world;
* `y` an integer representing an y coordinate in that world; * `y` an integer representing an y coordinate in that world;
* `depth` an integer representing the distance from [x,y] that * `depth` an integer representing the distance from [x,y] that
should be searched should be searched."
Gets the neighbours within the specified distance of the cell at
coordinates [x,y] in this world."
([world x y depth] ([world x y depth]
(remove nil? (remove nil?
(map #(get-cell world (first %) (first (rest %))) (map #(get-cell world (first %) (first (rest %)))
@ -166,8 +93,18 @@
(range (- x depth) (+ x depth 1)) (range (- x depth) (+ x depth 1))
(range (- y depth) (+ y depth 1))))))) (range (- y depth) (+ y depth 1)))))))
([world cell depth] ([world cell depth]
(memo-get-neighbours world (:x cell) (:y cell) depth)) "Get the neighbours to distance depth of this cell in this world.
* `world` a world, as described in world.clj;
* `cell` a cell within that world;
* `depth` an integer representing the distance from [x,y] that
should be searched."
(get-neighbours world (:x cell) (:y cell) depth))
([world cell] ([world cell]
"Get the immediate neighbours of this cell in this world
* `world` a world, as described in world.clj;
* `cell` a cell within that world."
(get-neighbours world cell 1))) (get-neighbours world cell 1)))
(defn get-neighbours-with-property-value (defn get-neighbours-with-property-value
@ -177,10 +114,10 @@
* `world` a world, as described in `world.clj`; * `world` a world, as described in `world.clj`;
* `cell` a cell within that world; * `cell` a cell within that world;
* `depth` an integer representing the distance from [x,y] that * `depth` an integer representing the distance from [x,y] that
should be searched (optional); should be searched;
* `property` a keyword representing a property of the neighbours; * `property` a keyword representing a property of the neighbours;
* `value` a value of that property (or, possibly, the name of another); * `value` a value of that property (or, possibly, the name of another);
* `op` a comparator function to use in place of `=` (optional). * `op` a comparator function to use in place of `=`.
It gets messy." It gets messy."
([world x y depth property value op] ([world x y depth property value op]
@ -258,16 +195,4 @@
row))) row)))
world)))) world))))
(defn merge-cell
"Return a world like this `world`, but merge the values from this `cell` with
those from the cell in the world with the same co-ordinates"
[world cell]
(if (in-bounds world (:x cell) (:y cell))
(map-world world
#(if
(and
(= (:x cell)(:x %2))
(= (:y cell)(:y %2)))
(merge %2 cell)
%2))
world))

48
test/mw_engine/drainage_test.clj
View file

@ -1,48 +0,0 @@
(ns mw-engine.drainage-test
(:require [clojure.test :refer :all]
[mw-engine.world :as world]
[mw-engine.utils :as utils]
[mw-engine.drainage :refer :all]))
(deftest is-hollow-test
(testing "detection of hollows"
(let [world (utils/set-property
(utils/map-world
(world/make-world 3 3)
#(merge %2 {:altitude 100}))
1 1 :altitude 90)]
(is (is-hollow world (utils/get-cell world 1 1))
"Cell at 1, 1 should be a hollow"))))
(deftest flood-hollow-test
(testing "Flooding of a single specified cell"
(let [world (utils/set-property
(utils/map-world
(world/make-world 3 3)
#(merge %2 {:altitude 100}))
1 1 :altitude 90)
cell (flood-hollow world (utils/get-cell world 1 1))]
(is (= (:state cell) :water)
"State should be water")
(is (= (:altitude cell) 100)
"Altitude should be 100"))))
(deftest flood-hollows-test
(testing "Flooding of hollows"
(let [world (utils/set-property
(utils/map-world
(world/make-world 3 3)
#(merge %2 {:altitude 100}))
1 1 :altitude 90)
w2 (flood-hollows world)]
(is (= (:state (utils/get-cell world 1 1)) :new)
"State of cell in original world should still be :new")
(is (= (:state (utils/get-cell w2 1 1)) :water)
"State of cell in processed world should still be :water")
(is (= (:altitude (utils/get-cell w2 1 1)) 100)
"Altitude of cell in processed world should still be 100"))))

12
test/mw_engine/utils_test.clj
View file

@ -165,17 +165,5 @@
(is (empty? (remove #(= % 8) (map #(:number %) (flatten w3c)))) (is (empty? (remove #(= % 8) (map #(:number %) (flatten w3c))))
"All cells should have property 'number' set to 8")))) "All cells should have property 'number' set to 8"))))
(deftest merge-cell-test
(testing "merge-cell utility function"
(let [w1a (make-world 3 3)
w2b (merge-cell w1a {:x 5 :y 5 :out-of-bounds true})
w3c (merge-cell w1a {:x 2 :y 2 :test true})]
(is (= w1a w2b) "Out of bound cell makes no difference")
(is (empty? (filter #(:out-of-bounds %) (flatten w2b)))
"No cell has :out-of-bounds set")
(is (= 1 (count (filter #(:test %) (flatten w3c))))
"Exactly one cell has :test set")
(is (:test (get-cell w3c 2 2))
"The cell with :test set is at 2, 2"))))