1 files changed, 71 insertions, 0 deletions
diff --git a/src/anim/EaseInOutAnim.cpp b/src/anim/EaseInOutAnim.cpp
new file mode 100644
index 0000000..c8a3cf7
--- /dev/null
+++ b/src/anim/EaseInOutAnim.cpp
@@ -0,0 +1,71 @@
+//
+//  libavg - Media Playback Engine. 
+//  Copyright (C) 2003-2014 Ulrich von Zadow
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2 of the License, or (at your option) any later version.
+//
+//  This library is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+//  Lesser General Public License for more details.
+//
+//  You should have received a copy of the GNU Lesser General Public
+//  License along with this library; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+//  Current versions can be found at www.libavg.de
+//
+
+#include "EaseInOutAnim.h"
+
+#include "../player/Player.h"
+#include "../base/MathHelper.h"
+
+#include <math.h>
+
+using namespace boost::python;
+using namespace std;
+
+namespace avg {
+
+EaseInOutAnim::EaseInOutAnim(const object& node, const string& sAttrName, 
+            long long duration, const object& startValue, const object& endValue, 
+            long long easeInDuration, long long easeOutDuration, bool bUseInt, 
+            const object& startCallback, const object& stopCallback)
+    : SimpleAnim(node, sAttrName, duration, startValue, endValue, bUseInt, startCallback,
+            stopCallback),
+      m_EaseInDuration(float(easeInDuration)/duration),
+      m_EaseOutDuration(float(easeOutDuration)/duration)
+{
+}
+
+EaseInOutAnim::~EaseInOutAnim()
+{
+}
+
+float EaseInOutAnim::interpolate(float t)
+{
+    float accelDist = m_EaseInDuration*2/PI;
+    float decelDist = m_EaseOutDuration*2/PI;
+    float dist;
+    if (t<m_EaseInDuration) {
+        // Acceleration stage 
+        float nt = t/m_EaseInDuration;
+        float s = sin(-PI/2+nt*PI/2)+1;
+        dist = s*accelDist;
+    } else if (t > 1-m_EaseOutDuration) {
+        // Deceleration stage
+        float nt = (t-(1-m_EaseOutDuration))/m_EaseOutDuration;
+        float s = sin(nt*PI/2);
+        dist = accelDist+(1-m_EaseInDuration-m_EaseOutDuration)+s*decelDist;
+    } else {
+        // Linear stage
+        dist = accelDist+t-m_EaseInDuration;
+    }
+    return dist/(accelDist+(1-m_EaseInDuration-m_EaseOutDuration)+decelDist);
+}
+
+}