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cocos2d/cocos/2d/CCActionTween.cpp

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+/****************************************************************************
+Copyright (c) 2009      lhunath (Maarten Billemont)
+Copyright (c) 2010-2012 cocos2d-x.org
+CopyRight (c) 2013-2014 Chukong Technologies Inc.
+ 
+http://www.cocos2d-x.org
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+****************************************************************************/
+
+#include "2d/CCActionTween.h"
+
+NS_CC_BEGIN
+
+ActionTween* ActionTween::create(float duration, const std::string& key, float from, float to)
+{
+    ActionTween* ret = new (std::nothrow) ActionTween();
+    if (ret && ret->initWithDuration(duration, key, from, to))
+    {
+        ret->autorelease();
+    }
+    else
+    {
+        CC_SAFE_DELETE(ret);
+    }
+    return ret;
+}
+
+bool ActionTween::initWithDuration(float duration, const std::string& key, float from, float to)
+{
+    if (ActionInterval::initWithDuration(duration))
+    {
+        _key    = key;
+        _to       = to;
+        _from     = from;
+        return true;
+    }
+
+    return false;
+}
+
+ActionTween *ActionTween::clone() const
+{
+    // no copy constructor    
+    auto a = new (std::nothrow) ActionTween();
+    a->initWithDuration(_duration, _key.c_str(), _from, _to);
+    a->autorelease();
+    return a;
+}
+
+void ActionTween::startWithTarget(Node *target)
+{
+    CCASSERT(dynamic_cast<ActionTweenDelegate*>(target), "target must implement ActionTweenDelegate");
+    ActionInterval::startWithTarget(target);
+    _delta = _to - _from;
+}
+
+void ActionTween::update(float dt)
+{
+    dynamic_cast<ActionTweenDelegate*>(_target)->updateTweenAction(_to  - _delta * (1 - dt), _key.c_str());
+}
+
+ActionTween* ActionTween::reverse() const
+{
+    return ActionTween::create(_duration, _key.c_str(), _to, _from);
+}
+
+
+NS_CC_END