Robert Penner 缓和方程

Used in Qt Core ( QEasingCurve ).

The sources can be found in qt5/qtbase/src/3rdparty/easing/easing.cpp.

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Copyright (c) 2001 Robert Penner
					

BSD 3 条款新 (或修订) 许可 .

Copyright (c) 2001 Robert Penner
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