solve #1026

kinetic.js

@@ -4,7 +4,7 @@
  * http://www.kineticjs.com/
  * Copyright 2013, Eric Rowell
  * Licensed under the MIT or GPL Version 2 licenses.
- * Date: 2014-09-24
+ * Date: 2014-10-02
  *
  * Copyright (C) 2011 - 2013 by Eric Rowell
  *
@@ -6429,11 +6429,18 @@ var Kinetic = {};
         var that = this,
             node = config.node,
             nodeId = node._id,
-            duration = config.duration || 1,
+            duration,
             easing = config.easing || Kinetic.Easings.Linear,
             yoyo = !!config.yoyo,
             key;
 
+        if (typeof config.duration === 'undefined') {
+            duration = 1;
+        } else if (config.duration === 0) {  // zero is bad value for duration
+            duration = 0.001;
+        } else {
+            duration = config.duration;
+        }
         this.node = node;
         this._id = idCounter++;
 

src/Tween.js

@@ -38,11 +38,18 @@
         var that = this,
             node = config.node,
             nodeId = node._id,
-            duration = config.duration || 1,
+            duration,
             easing = config.easing || Kinetic.Easings.Linear,
             yoyo = !!config.yoyo,
             key;
 
+        if (typeof config.duration === 'undefined') {
+            duration = 1;
+        } else if (config.duration === 0) {  // zero is bad value for duration
+            duration = 0.001;
+        } else {
+            duration = config.duration;
+        }
         this.node = node;
         this._id = idCounter++;
 

test/unit/Tween-test.js

@@ -102,4 +102,42 @@ suite('Tween', function() {
 
 
     });
+
+    // ======================================================
+    test('zero duration', function(done) {
+        var stage = addStage();
+
+        var layer = new Kinetic.Layer();
+
+        var circle = new Kinetic.Circle({
+            x: 100,
+            y: stage.getHeight() / 2,
+            radius: 70,
+            fill: 'green',
+            stroke: 'blue',
+            strokeWidth: 4
+        });
+
+        layer.add(circle);
+        stage.add(layer);
+
+
+        var tween = new Kinetic.Tween({
+            node: circle,
+            duration: 0,
+            x: 200,
+            y: 100
+        });
+        tween.play();
+
+
+        setTimeout(function(){
+            "use strict";
+            assert.equal(circle.x(), 200);
+            assert.equal(circle.y(), 100);
+            done();
+        }, 60);
+
+    });
+
 });