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CoreAnimation Easing functions, based on Robert Penners easing functions
Objective-C
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EaseFunctions.xcodeproj
EaseFunctions
README.mdown

README.mdown

MEEaseFunctions

MEEaseFunctions is an Objective-C class that gives interpreted CATimingFunctions based on Robert Penners. You can use these as you would any other CATimingFunctions within CoreAnimation.

These easing functions are interpreted from Robert Penners easing functions that are commonly used in Flash animation and interfaces

Robert Penners easing functions use math algorithms to calculate easing values. Core Animations CATimingFunctions are based on Bezier curves, and are constructed from two end points and two control points. Because of this the MEEaseFunctions are literally traced from visual representations of Robert Penners equations.

Because Core Animation uses simple Bezier curves it is impossible to replicate the bounce and elastic easing functions.


Usage

MEEaseFunctions are very simple to use. Just import the MEEaseFunctions.h header into your class then use the following line of code to retrieve the TimingFunction that you want.

[MEEaseFunctionBuilder functionWithType:xxx] where xxx is the easing function e.g. EaseTypeExpoOut

This can obviously used inline as so

[CATransaction setAnimationTimingFunction:[MEEaseFunctionBuilder functionWithType: EaseTypeExpoOut]];


Licence

This code is distributed under the terms and conditions of the MIT license.

Copyright (c) 2011 Niall McCormack

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.


Change-log

Version 0.1 @ 13 July 2011

  • Initial release
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