18b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru/* 28b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * Copyright (C) 2009 The Android Open Source Project 38b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * 48b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * Licensed under the Apache License, Version 2.0 (the "License"); 58b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * you may not use this file except in compliance with the License. 68b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * You may obtain a copy of the License at 78b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * 88b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * http://www.apache.org/licenses/LICENSE-2.0 98b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * 108b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * Unless required by applicable law or agreed to in writing, software 118b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * distributed under the License is distributed on an "AS IS" BASIS, 128b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 138b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * See the License for the specific language governing permissions and 148b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * limitations under the License. 158b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru */ 168b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 178b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Querupackage android.view.animation; 188b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 198b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queruimport android.content.Context; 208b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queruimport android.content.res.TypedArray; 218b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queruimport android.util.AttributeSet; 228b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 238b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru/** 248b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * An interpolator where the change flings forward and overshoots the last value 258b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * then comes back. 268b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru */ 278b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Querupublic class OvershootInterpolator implements Interpolator { 288b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru private final float mTension; 298b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 308b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru public OvershootInterpolator() { 318b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru mTension = 2.0f; 328b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru } 338b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 348b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru /** 358b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * @param tension Amount of overshoot. When tension equals 0.0f, there is 368b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * no overshoot and the interpolator becomes a simple 378b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * deceleration interpolator. 388b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru */ 398b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru public OvershootInterpolator(float tension) { 408b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru mTension = tension; 418b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru } 428b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 438b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru public OvershootInterpolator(Context context, AttributeSet attrs) { 448b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru TypedArray a = context.obtainStyledAttributes(attrs, 458b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru com.android.internal.R.styleable.OvershootInterpolator); 468b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 478b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru mTension = 488b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru a.getFloat(com.android.internal.R.styleable.OvershootInterpolator_tension, 2.0f); 498b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 508b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru a.recycle(); 518b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru } 528b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 538b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru public float getInterpolation(float t) { 548b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru // _o(t) = t * t * ((tension + 1) * t + tension) 558b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru // o(t) = _o(t - 1) + 1 568b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru t -= 1.0f; 578b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru return t * t * ((mTension + 1) * t + mTension) + 1.0f; 588b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru } 598b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru} 60