From 8eef005a40cb39351a6992d9d1b44078574b9567 Mon Sep 17 00:00:00 2001
From: secretrobotron <secretrobotron@gmail.com>
Date: Sun, 16 Oct 2011 13:15:41 -0400
Subject: [PATCH] 1. Initial tween library offering 2. Simple tests for
 tweening 3. build.json changes for tween lib 4. Abacus core file

---
 build.json                |  6 ++--
 src/abacus.js             | 15 ++++++++++
 src/abacus.timer.js       |  8 ++----
 src/abacus.tween.js       | 59 +++++++++++++++++++++++++++++++++++++++
 test/index.html           |  3 ++
 test/unit/abacus.tween.js | 23 +++++++++++++++
 6 files changed, 106 insertions(+), 8 deletions(-)
 create mode 100644 src/abacus.js
 create mode 100644 src/abacus.tween.js
 create mode 100644 test/unit/abacus.tween.js

diff --git a/build.json b/build.json
index 560b377..20a6d52 100644
--- a/build.json
+++ b/build.json
@@ -2,7 +2,9 @@
 	"files": {
 		"dist/abacus": {
 			"src": [
-				"src/abacus.timer.js"
+				"src/abacus.js",
+				"src/abacus.timer.js",
+				"src/abacus.tween.js"
 			],
 			"prehint": true,
 			"posthint": false,
@@ -18,4 +20,4 @@
 			}
 		}
 	}
-}
\ No newline at end of file
+}
diff --git a/src/abacus.js b/src/abacus.js
new file mode 100644
index 0000000..cff0473
--- /dev/null
+++ b/src/abacus.js
@@ -0,0 +1,15 @@
+(function( window ) {
+
+  var Abacus = window.Abacus || {};
+
+  Abacus.guid = function() {
+    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
+      var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
+      return v.toString(16);
+    }).toUpperCase();
+  };
+
+  // Re-expose Abacus object
+  window.Abacus = Abacus;
+
+})( this );
diff --git a/src/abacus.timer.js b/src/abacus.timer.js
index 21a6df5..704ae5f 100644
--- a/src/abacus.timer.js
+++ b/src/abacus.timer.js
@@ -12,9 +12,8 @@
     };
   })();
 
-  var Abacus = window.Abacus || {},
       // An array of callbacks to call in our rAF
-      callbackQueue = [],
+  var callbackQueue = [],
       // the function we call on each tick of the rAF
       timerLoop = function() {
 
@@ -125,11 +124,8 @@
   };
 
   // Wrap new Timer() construction in Abacus.timer() API
-  Abacus.timer = function( options ) {
+  window.Abacus.timer = function( options ) {
     return new Timer( options );
   };
 
-  // Re-expose Abacus object
-  window.Abacus = Abacus;
-
 })( this );
diff --git a/src/abacus.tween.js b/src/abacus.tween.js
new file mode 100644
index 0000000..1d61462
--- /dev/null
+++ b/src/abacus.tween.js
@@ -0,0 +1,59 @@
+(function( window ) {
+
+  var types = {
+    "linear": function( start, stop, index ) {
+      return ( stop - start ) * index + start;
+    }
+  };
+
+  function Tween( options ) {
+
+    options = options || {};
+
+    var tweenFunction;
+
+    this.index = options.index || 0;
+    this.start = options.start || 0;
+    this.stop = options.stop || 0;
+
+    function chooseTweenFunction( tween ) {
+      if ( tween ) {
+        var tweenParamType = typeof( tween );
+        if ( tweenParamType === "string" ) {
+          tweenFunction = types[ tween ] || function() {};
+        }
+        else if ( tweenParamType === "function" ) {
+          tweenFunction = tween;
+        }
+        else {
+          tweenFunction = function(){};
+        }
+      }
+      else {
+        tweenFunction = function(){};
+      }
+    } //chooseTweenFunction
+
+    this.get = function( preferredIndex ) {
+      this.index = preferredIndex || this.index;
+      return tweenFunction( this.start, this.stop, this.index );
+    }; //step
+
+    Object.defineProperty( this, "type", {
+      get: function() {
+        return tweenFunction;
+      },
+      set: function( val ) {
+        chooseTweenFunction( val );
+      }
+    });
+
+    chooseTweenFunction( options.type );
+
+  } //Tween
+
+  window.Abacus.tween = function( options ) {
+    return new Tween( options );
+  };
+
+})( this );
diff --git a/test/index.html b/test/index.html
index 6cf82a4..25b1c41 100644
--- a/test/index.html
+++ b/test/index.html
@@ -8,8 +8,11 @@
   <link rel="Stylesheet" media="screen" href="qunit/qunit/qunit.css" />
 
   <!-- Abacus -->
+  <script src="../src/abacus.js"></script>
+  <script src="../src/abacus.tween.js"></script>
   <script src="../src/abacus.timer.js"></script>
   <!-- tests -->
+  <script src="unit/abacus.tween.js"></script>
   <script src="unit/abacus.timer.js"></script>
 </head>
 <body>
diff --git a/test/unit/abacus.tween.js b/test/unit/abacus.tween.js
new file mode 100644
index 0000000..81f7369
--- /dev/null
+++ b/test/unit/abacus.tween.js
@@ -0,0 +1,23 @@
+module('Tween Module');
+test('Test that the Abacus.tween exists', 1, function() {
+  ok( Abacus.tween, 'Abacus.tween exists' );
+});
+
+test('Tween instances have step method', 1, function() {
+  var tween = Abacus.tween();
+  equal( typeof tween.get, 'function', 'the tween instance has a get method' );
+});
+
+test('Linear Tween is correct', 3, function() {
+  var tween = Abacus.tween({
+    type: "linear",
+    start: 6,
+    stop: 8
+  });
+
+  equal( tween.get( 0 ), 6, 'get(0) is correct' );
+  equal( tween.get( 1 ), 8, 'get(1) is correct' );
+  equal( tween.get( .5 ), 7, 'get(.5) is correct' );
+});
+
+