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; 20e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghuiimport android.content.res.Resources; 21e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghuiimport android.content.res.Resources.Theme; 228b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queruimport android.content.res.TypedArray; 238b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queruimport android.util.AttributeSet; 248b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 25e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghuiimport com.android.internal.R; 26c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reckimport com.android.internal.view.animation.HasNativeInterpolator; 27c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reckimport com.android.internal.view.animation.NativeInterpolatorFactory; 28c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reckimport com.android.internal.view.animation.NativeInterpolatorFactoryHelper; 29c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck 308b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru/** 318b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * An interpolator where the change flings forward and overshoots the last value 328b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * then comes back. 338b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru */ 34c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck@HasNativeInterpolator 35c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reckpublic class OvershootInterpolator implements Interpolator, NativeInterpolatorFactory { 368b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru private final float mTension; 378b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 388b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru public OvershootInterpolator() { 398b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru mTension = 2.0f; 408b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru } 418b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 428b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru /** 438b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * @param tension Amount of overshoot. When tension equals 0.0f, there is 448b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * no overshoot and the interpolator becomes a simple 458b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru * deceleration interpolator. 468b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru */ 478b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru public OvershootInterpolator(float tension) { 488b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru mTension = tension; 498b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru } 508b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 518b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru public OvershootInterpolator(Context context, AttributeSet attrs) { 52e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui this(context.getResources(), context.getTheme(), attrs); 53e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui } 54e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui 55e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui /** @hide */ 56e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui public OvershootInterpolator(Resources res, Theme theme, AttributeSet attrs) { 57e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui TypedArray a; 58e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui if (theme != null) { 59e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui a = theme.obtainStyledAttributes(attrs, R.styleable.OvershootInterpolator, 0, 0); 60e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui } else { 61e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui a = res.obtainAttributes(attrs, R.styleable.OvershootInterpolator); 62e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui } 638b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 648b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru mTension = 65e5e92602a41a4ddc7b42cd1c171a0edfbd09b8daztenghui a.getFloat(R.styleable.OvershootInterpolator_tension, 2.0f); 668b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 678b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru a.recycle(); 688b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru } 698b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru 708b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru public float getInterpolation(float t) { 718b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru // _o(t) = t * t * ((tension + 1) * t + tension) 728b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru // o(t) = _o(t - 1) + 1 738b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru t -= 1.0f; 748b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru return t * t * ((mTension + 1) * t + mTension) + 1.0f; 758b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru } 76c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck 77c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck /** @hide */ 78c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck @Override 79c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck public long createNativeInterpolator() { 80c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck return NativeInterpolatorFactoryHelper.createOvershootInterpolator(mTension); 81c8ac775659fd252ce2cc9a61837c170ff70f0a1aJohn Reck } 828b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru} 83