1 /* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.view.animation; 18 19 import android.content.Context; 20 import android.content.res.TypedArray; 21 import android.util.AttributeSet; 22 23 /** 24 * Repeats the animation for a specified number of cycles. The 25 * rate of change follows a sinusoidal pattern. 26 * 27 */ 28 public class CycleInterpolator implements Interpolator { 29 public CycleInterpolator(float cycles) { 30 mCycles = cycles; 31 } 32 33 public CycleInterpolator(Context context, AttributeSet attrs) { 34 TypedArray a = 35 context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.CycleInterpolator); 36 37 mCycles = a.getFloat(com.android.internal.R.styleable.CycleInterpolator_cycles, 1.0f); 38 39 a.recycle(); 40 } 41 42 public float getInterpolation(float input) { 43 return (float)(Math.sin(2 * mCycles * Math.PI * input)); 44 } 45 46 private float mCycles; 47 } 48
