Add matrix library abstraction.

src/uxbox/matrix.cljs

@@ -0,0 +1,40 @@
+(ns uxbox.matrix
+  "A lightweight abstraction over Matrix library
+  of the Google Closure Library."
+  (:import goog.math.Matrix
+           goog.math.Size))
+
+(extend-type Matrix
+  cljs.core/ICounted
+  (-count [v]
+    (let [^Size size (.getSize v)]
+      (* (.-width size)
+         (.-height size))))
+
+  cljs.core/IDeref
+  (-deref [v]
+    (js->clj (.toArray v)))
+
+  IPrintWithWriter
+  (-pr-writer [v writer _]
+    (->> (str "#goog.math.Matrix " (js->clj (.toArray v)))
+         (cljs.core/-write writer))))
+
+(defn matrix
+  "Create a matrix instance from coll.
+  The size is determined by the number
+  of elements of the collection."
+  [coll]
+  {:pre [(coll? coll)
+         (coll? (first coll))
+         (= (count coll)
+            (count (first coll)))]}
+  (Matrix. (clj->js coll)))
+
+(defn multiply
+  ([n] n)
+  ([n m]
+   (.multiply n m))
+  ([n m & more]
+   (reduce multiply (.multiply n m) more)))
+