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.Resources; 21 import android.content.res.Resources.Theme; 22 import android.content.res.TypedArray; 23 import android.util.AttributeSet; 24 25 import com.android.internal.R; 26 import com.android.internal.view.animation.HasNativeInterpolator; 27 import com.android.internal.view.animation.NativeInterpolatorFactory; 28 import com.android.internal.view.animation.NativeInterpolatorFactoryHelper; 29 30 /** 31 * Repeats the animation for a specified number of cycles. The 32 * rate of change follows a sinusoidal pattern. 33 * 34 */ 35 @HasNativeInterpolator 36 public class CycleInterpolator extends BaseInterpolator implements NativeInterpolatorFactory { 37 public CycleInterpolator(float cycles) { 38 mCycles = cycles; 39 } 40 41 public CycleInterpolator(Context context, AttributeSet attrs) { 42 this(context.getResources(), context.getTheme(), attrs); 43 } 44 45 /** @hide */ 46 public CycleInterpolator(Resources resources, Theme theme, AttributeSet attrs) { 47 TypedArray a; 48 if (theme != null) { 49 a = theme.obtainStyledAttributes(attrs, R.styleable.CycleInterpolator, 0, 0); 50 } else { 51 a = resources.obtainAttributes(attrs, R.styleable.CycleInterpolator); 52 } 53 54 mCycles = a.getFloat(R.styleable.CycleInterpolator_cycles, 1.0f); 55 setChangingConfiguration(a.getChangingConfigurations()); 56 a.recycle(); 57 } 58 59 public float getInterpolation(float input) { 60 return (float)(Math.sin(2 * mCycles * Math.PI * input)); 61 } 62 63 private float mCycles; 64 65 /** @hide */ 66 @Override 67 public long createNativeInterpolator() { 68 return NativeInterpolatorFactoryHelper.createCycleInterpolator(mCycles); 69 } 70 } 71
