mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
805 lines
31 KiB
Java
805 lines
31 KiB
Java
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.mozilla.gecko.widget;
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import org.mozilla.gecko.AppConstants.Versions;
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import android.content.Context;
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import android.content.res.Resources;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import android.graphics.RectF;
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import android.support.v4.view.ViewCompat;
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import android.util.AttributeSet;
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import android.util.DisplayMetrics;
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import android.view.MotionEvent;
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import android.view.View;
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import android.view.ViewConfiguration;
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import android.view.ViewGroup;
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import android.view.animation.AccelerateInterpolator;
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import android.view.animation.Animation;
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import android.view.animation.Animation.AnimationListener;
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import android.view.animation.AnimationUtils;
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import android.view.animation.DecelerateInterpolator;
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import android.view.animation.Interpolator;
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import android.view.animation.Transformation;
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import android.widget.AbsListView;
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/**
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* GeckoSwipeRefreshLayout is mostly lifted from Android's support library (v4) with these
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* modfications:
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* - Removes elastic "rubber banding" effect when overscrolling the child view.
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* - Changes the height of the progress bar to match the height of HomePager's page indicator.
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* - Uses a rectangle rather than a circle for the SwipeProgressBar indicator.
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*
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* This class also embeds package-access dependent classes SwipeProgressBar and
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* BakedBezierInterpolator.
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*
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* Original source: https://android.googlesource.com/platform/frameworks/support/+/
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* android-support-lib-19.1.0/v4/java/android/support/v4/widget/SwipeRefreshLayout.java
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*/
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public class GeckoSwipeRefreshLayout extends ViewGroup {
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private static final long RETURN_TO_ORIGINAL_POSITION_TIMEOUT = 300;
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private static final float ACCELERATE_INTERPOLATION_FACTOR = 1.5f;
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private static final float DECELERATE_INTERPOLATION_FACTOR = 2f;
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// Reduce the height (from 4 to 3) of the progress bar to match HomePager's page indicator.
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private static final float PROGRESS_BAR_HEIGHT = 3;
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private static final float MAX_SWIPE_DISTANCE_FACTOR = .6f;
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private static final int REFRESH_TRIGGER_DISTANCE = 120;
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/* inner-access */ SwipeProgressBar mProgressBar; // shows progress is going
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/* inner-access */ View mTarget; // content that gets pulled down
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/* inner-access */ int mOriginalOffsetTop;
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/* inner-access */ int mFrom;
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/* inner-access */ int mMediumAnimationDuration;
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/* inner-access */ float mFromPercentage;
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/* inner-access */ float mCurrPercentage;
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/* inner-access */ int mCurrentTargetOffsetTop;
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private OnRefreshListener mListener;
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private MotionEvent mDownEvent;
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private boolean mRefreshing;
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private int mTouchSlop;
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private float mDistanceToTriggerSync = -1;
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private float mPrevY;
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private int mProgressBarHeight;
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// Target is returning to its start offset because it was cancelled or a
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// refresh was triggered.
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/* inner-access */ boolean mReturningToStart;
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/* inner-access */ final DecelerateInterpolator mDecelerateInterpolator;
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private final AccelerateInterpolator mAccelerateInterpolator;
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private static final int[] LAYOUT_ATTRS = new int[] {
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android.R.attr.enabled
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};
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private final Animation mAnimateToStartPosition = new Animation() {
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@Override
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public void applyTransformation(float interpolatedTime, Transformation t) {
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int targetTop = 0;
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if (mFrom != mOriginalOffsetTop) {
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targetTop = (mFrom + (int)((mOriginalOffsetTop - mFrom) * interpolatedTime));
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}
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int offset = targetTop - mTarget.getTop();
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final int currentTop = mTarget.getTop();
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if (offset + currentTop < 0) {
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offset = 0 - currentTop;
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}
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setTargetOffsetTopAndBottom(offset);
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}
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};
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/* inner-access */ Animation mShrinkTrigger = new Animation() {
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@Override
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public void applyTransformation(float interpolatedTime, Transformation t) {
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float percent = mFromPercentage + ((0 - mFromPercentage) * interpolatedTime);
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mProgressBar.setTriggerPercentage(percent);
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}
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};
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/* inner-access */ final AnimationListener mReturnToStartPositionListener = new BaseAnimationListener() {
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@Override
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public void onAnimationEnd(Animation animation) {
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// Once the target content has returned to its start position, reset
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// the target offset to 0
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mCurrentTargetOffsetTop = 0;
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}
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};
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/* inner-access */ final AnimationListener mShrinkAnimationListener = new BaseAnimationListener() {
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@Override
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public void onAnimationEnd(Animation animation) {
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mCurrPercentage = 0;
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}
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};
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private final Runnable mReturnToStartPosition = new Runnable() {
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@Override
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public void run() {
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mReturningToStart = true;
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animateOffsetToStartPosition(mCurrentTargetOffsetTop + getPaddingTop(),
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mReturnToStartPositionListener);
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}
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};
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// Cancel the refresh gesture and animate everything back to its original state.
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private final Runnable mCancel = new Runnable() {
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@Override
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public void run() {
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mReturningToStart = true;
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// Timeout fired since the user last moved their finger; animate the
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// trigger to 0 and put the target back at its original position
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if (mProgressBar != null) {
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mFromPercentage = mCurrPercentage;
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mShrinkTrigger.setDuration(mMediumAnimationDuration);
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mShrinkTrigger.setAnimationListener(mShrinkAnimationListener);
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mShrinkTrigger.reset();
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mShrinkTrigger.setInterpolator(mDecelerateInterpolator);
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startAnimation(mShrinkTrigger);
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}
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animateOffsetToStartPosition(mCurrentTargetOffsetTop + getPaddingTop(),
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mReturnToStartPositionListener);
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}
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};
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/**
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* Simple constructor to use when creating a GeckoSwipeRefreshLayout from code.
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* @param context
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*/
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public GeckoSwipeRefreshLayout(Context context) {
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this(context, null);
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}
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/**
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* Constructor that is called when inflating GeckoSwipeRefreshLayout from XML.
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* @param context
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* @param attrs
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*/
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public GeckoSwipeRefreshLayout(Context context, AttributeSet attrs) {
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super(context, attrs);
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mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
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mMediumAnimationDuration = getResources().getInteger(
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android.R.integer.config_mediumAnimTime);
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setWillNotDraw(false);
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mProgressBar = new SwipeProgressBar(this);
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final DisplayMetrics metrics = getResources().getDisplayMetrics();
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mProgressBarHeight = (int) (metrics.density * PROGRESS_BAR_HEIGHT);
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mDecelerateInterpolator = new DecelerateInterpolator(DECELERATE_INTERPOLATION_FACTOR);
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mAccelerateInterpolator = new AccelerateInterpolator(ACCELERATE_INTERPOLATION_FACTOR);
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final TypedArray a = context.obtainStyledAttributes(attrs, LAYOUT_ATTRS);
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setEnabled(a.getBoolean(0, true));
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a.recycle();
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}
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@Override
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public void onAttachedToWindow() {
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super.onAttachedToWindow();
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removeCallbacks(mCancel);
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removeCallbacks(mReturnToStartPosition);
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// Sometimes the inner view doesn't get a proper layout
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// pass when re-attached to the view tree (see bug 1010986).
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if (getChildCount() > 0) {
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getChildAt(0).forceLayout();
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}
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}
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@Override
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public void onDetachedFromWindow() {
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super.onDetachedFromWindow();
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removeCallbacks(mReturnToStartPosition);
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removeCallbacks(mCancel);
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}
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/* inner-access */ void animateOffsetToStartPosition(int from, AnimationListener listener) {
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mFrom = from;
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mAnimateToStartPosition.reset();
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mAnimateToStartPosition.setDuration(mMediumAnimationDuration);
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mAnimateToStartPosition.setAnimationListener(listener);
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mAnimateToStartPosition.setInterpolator(mDecelerateInterpolator);
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mTarget.startAnimation(mAnimateToStartPosition);
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}
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/**
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* Set the listener to be notified when a refresh is triggered via the swipe
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* gesture.
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*/
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public void setOnRefreshListener(OnRefreshListener listener) {
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mListener = listener;
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}
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private void setTriggerPercentage(float percent) {
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if (percent == 0f) {
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// No-op. A null trigger means it's uninitialized, and setting it to zero-percent
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// means we're trying to reset state, so there's nothing to reset in this case.
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mCurrPercentage = 0;
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return;
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}
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mCurrPercentage = percent;
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mProgressBar.setTriggerPercentage(percent);
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}
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/**
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* Notify the widget that refresh state has changed. Do not call this when
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* refresh is triggered by a swipe gesture.
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*
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* @param refreshing Whether or not the view should show refresh progress.
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*/
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public void setRefreshing(boolean refreshing) {
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if (mRefreshing != refreshing) {
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ensureTarget();
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mCurrPercentage = 0;
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mRefreshing = refreshing;
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if (mRefreshing) {
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mProgressBar.start();
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} else {
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mProgressBar.stop();
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}
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}
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}
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/**
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* Set the four colors used in the progress animation. The first color will
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* also be the color of the bar that grows in response to a user swipe
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* gesture.
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*
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* @param colorRes1 Color resource.
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* @param colorRes2 Color resource.
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* @param colorRes3 Color resource.
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* @param colorRes4 Color resource.
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*/
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public void setColorScheme(int colorRes1, int colorRes2, int colorRes3, int colorRes4) {
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ensureTarget();
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final Resources res = getResources();
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final int color1 = res.getColor(colorRes1);
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final int color2 = res.getColor(colorRes2);
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final int color3 = res.getColor(colorRes3);
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final int color4 = res.getColor(colorRes4);
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mProgressBar.setColorScheme(color1, color2, color3,color4);
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}
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/**
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* @return Whether the SwipeRefreshWidget is actively showing refresh
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* progress.
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*/
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public boolean isRefreshing() {
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return mRefreshing;
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}
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private void ensureTarget() {
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// Don't bother getting the parent height if the parent hasn't been laid out yet.
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if (mTarget == null) {
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if (getChildCount() > 1 && !isInEditMode()) {
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throw new IllegalStateException(
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"GeckoSwipeRefreshLayout can host only one direct child");
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}
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mTarget = getChildAt(0);
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mOriginalOffsetTop = mTarget.getTop() + getPaddingTop();
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}
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if (mDistanceToTriggerSync == -1) {
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if (getParent() != null && ((View)getParent()).getHeight() > 0) {
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final DisplayMetrics metrics = getResources().getDisplayMetrics();
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mDistanceToTriggerSync = (int) Math.min(
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((View) getParent()) .getHeight() * MAX_SWIPE_DISTANCE_FACTOR,
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REFRESH_TRIGGER_DISTANCE * metrics.density);
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}
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}
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}
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@Override
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public void draw(Canvas canvas) {
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super.draw(canvas);
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mProgressBar.draw(canvas);
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}
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@Override
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protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
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final int width = getMeasuredWidth();
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final int height = getMeasuredHeight();
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mProgressBar.setBounds(0, 0, width, mProgressBarHeight);
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if (getChildCount() == 0) {
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return;
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}
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final View child = getChildAt(0);
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final int childLeft = getPaddingLeft();
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final int childTop = mCurrentTargetOffsetTop + getPaddingTop();
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final int childWidth = width - getPaddingLeft() - getPaddingRight();
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final int childHeight = height - getPaddingTop() - getPaddingBottom();
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child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
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}
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@Override
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public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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if (getChildCount() > 1 && !isInEditMode()) {
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throw new IllegalStateException("GeckoSwipeRefreshLayout can host only one direct child");
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}
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if (getChildCount() > 0) {
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getChildAt(0).measure(
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MeasureSpec.makeMeasureSpec(
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getMeasuredWidth() - getPaddingLeft() - getPaddingRight(),
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MeasureSpec.EXACTLY),
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MeasureSpec.makeMeasureSpec(
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getMeasuredHeight() - getPaddingTop() - getPaddingBottom(),
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MeasureSpec.EXACTLY));
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}
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}
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/**
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* @return Whether it is possible for the child view of this layout to
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* scroll up. Override this if the child view is a custom view.
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*/
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public boolean canChildScrollUp() {
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if (Versions.preICS) {
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if (mTarget instanceof AbsListView) {
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final AbsListView absListView = (AbsListView) mTarget;
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return absListView.getChildCount() > 0
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&& (absListView.getFirstVisiblePosition() > 0 || absListView.getChildAt(0)
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.getTop() < absListView.getPaddingTop());
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} else {
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return mTarget.getScrollY() > 0;
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}
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} else {
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return ViewCompat.canScrollVertically(mTarget, -1);
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}
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}
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@Override
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public boolean onInterceptTouchEvent(MotionEvent ev) {
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ensureTarget();
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boolean handled = false;
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if (mReturningToStart && ev.getAction() == MotionEvent.ACTION_DOWN) {
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mReturningToStart = false;
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}
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if (isEnabled() && !mReturningToStart && !canChildScrollUp()) {
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handled = onTouchEvent(ev);
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}
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return !handled ? super.onInterceptTouchEvent(ev) : handled;
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}
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@Override
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public void requestDisallowInterceptTouchEvent(boolean b) {
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// Nope.
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}
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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final int action = event.getAction();
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boolean handled = false;
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switch (action) {
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case MotionEvent.ACTION_DOWN:
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mCurrPercentage = 0;
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mDownEvent = MotionEvent.obtain(event);
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mPrevY = mDownEvent.getY();
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break;
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case MotionEvent.ACTION_MOVE:
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if (mDownEvent != null && !mReturningToStart) {
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final float eventY = event.getY();
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float yDiff = eventY - mDownEvent.getY();
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if (yDiff > mTouchSlop) {
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// User velocity passed min velocity; trigger a refresh
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if (yDiff > mDistanceToTriggerSync) {
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// User movement passed distance; trigger a refresh
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startRefresh();
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handled = true;
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break;
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} else {
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// Just track the user's movement
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setTriggerPercentage(
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mAccelerateInterpolator.getInterpolation(
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yDiff / mDistanceToTriggerSync));
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float offsetTop = yDiff;
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if (mPrevY > eventY) {
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offsetTop = yDiff - mTouchSlop;
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}
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// Removed this call to disable "rubber-band" overscroll effect.
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// updateContentOffsetTop((int) offsetTop);
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if (mPrevY > eventY && (mTarget.getTop() < mTouchSlop)) {
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// If the user puts the view back at the top, we
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// don't need to. This shouldn't be considered
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// cancelling the gesture as the user can restart from the top.
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removeCallbacks(mCancel);
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} else {
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updatePositionTimeout();
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}
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mPrevY = event.getY();
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handled = true;
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}
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}
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}
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break;
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case MotionEvent.ACTION_UP:
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case MotionEvent.ACTION_CANCEL:
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if (mDownEvent != null) {
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mDownEvent.recycle();
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mDownEvent = null;
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}
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break;
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}
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return handled;
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}
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private void startRefresh() {
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removeCallbacks(mCancel);
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mReturnToStartPosition.run();
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setRefreshing(true);
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mListener.onRefresh();
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}
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private void updateContentOffsetTop(int targetTop) {
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final int currentTop = mTarget.getTop();
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if (targetTop > mDistanceToTriggerSync) {
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targetTop = (int) mDistanceToTriggerSync;
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} else if (targetTop < 0) {
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targetTop = 0;
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}
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setTargetOffsetTopAndBottom(targetTop - currentTop);
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}
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/* inner-access */ void setTargetOffsetTopAndBottom(int offset) {
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mTarget.offsetTopAndBottom(offset);
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mCurrentTargetOffsetTop = mTarget.getTop();
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}
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private void updatePositionTimeout() {
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removeCallbacks(mCancel);
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postDelayed(mCancel, RETURN_TO_ORIGINAL_POSITION_TIMEOUT);
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}
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/**
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* Classes that wish to be notified when the swipe gesture correctly
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* triggers a refresh should implement this interface.
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*/
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public interface OnRefreshListener {
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public void onRefresh();
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}
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/**
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* Simple AnimationListener to avoid having to implement unneeded methods in
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* AnimationListeners.
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*/
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private class BaseAnimationListener implements AnimationListener {
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@Override
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public void onAnimationStart(Animation animation) {
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}
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@Override
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public void onAnimationEnd(Animation animation) {
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}
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@Override
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public void onAnimationRepeat(Animation animation) {
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}
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}
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/**
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* The only modification to this class is the shape of the refresh indicator to be a rectangle
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* rather than a circle.
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*/
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private static final class SwipeProgressBar {
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// Default progress animation colors are grays.
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private final static int COLOR1 = 0xB3000000;
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private final static int COLOR2 = 0x80000000;
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private final static int COLOR3 = 0x4d000000;
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private final static int COLOR4 = 0x1a000000;
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// The duration of the animation cycle.
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private static final int ANIMATION_DURATION_MS = 2000;
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// The duration of the animation to clear the bar.
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private static final int FINISH_ANIMATION_DURATION_MS = 1000;
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// Interpolator for varying the speed of the animation.
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private static final Interpolator INTERPOLATOR = BakedBezierInterpolator.getInstance();
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private final Paint mPaint = new Paint();
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private final RectF mClipRect = new RectF();
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private float mTriggerPercentage;
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private long mStartTime;
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private long mFinishTime;
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private boolean mRunning;
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// Colors used when rendering the animation,
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private int mColor1;
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private int mColor2;
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private int mColor3;
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private int mColor4;
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private View mParent;
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private Rect mBounds = new Rect();
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public SwipeProgressBar(View parent) {
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mParent = parent;
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mColor1 = COLOR1;
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mColor2 = COLOR2;
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mColor3 = COLOR3;
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mColor4 = COLOR4;
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}
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/**
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* Set the four colors used in the progress animation. The first color will
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* also be the color of the bar that grows in response to a user swipe
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* gesture.
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*
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* @param color1 Integer representation of a color.
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* @param color2 Integer representation of a color.
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* @param color3 Integer representation of a color.
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* @param color4 Integer representation of a color.
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*/
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void setColorScheme(int color1, int color2, int color3, int color4) {
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mColor1 = color1;
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mColor2 = color2;
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mColor3 = color3;
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mColor4 = color4;
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}
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/**
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* Update the progress the user has made toward triggering the swipe
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* gesture. and use this value to update the percentage of the trigger that
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* is shown.
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*/
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void setTriggerPercentage(float triggerPercentage) {
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mTriggerPercentage = triggerPercentage;
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mStartTime = 0;
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ViewCompat.postInvalidateOnAnimation(mParent);
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}
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/**
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* Start showing the progress animation.
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*/
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void start() {
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if (!mRunning) {
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mTriggerPercentage = 0;
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mStartTime = AnimationUtils.currentAnimationTimeMillis();
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mRunning = true;
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mParent.postInvalidate();
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}
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}
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/**
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* Stop showing the progress animation.
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*/
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void stop() {
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if (mRunning) {
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mTriggerPercentage = 0;
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mFinishTime = AnimationUtils.currentAnimationTimeMillis();
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mRunning = false;
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mParent.postInvalidate();
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}
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}
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/**
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* @return Return whether the progress animation is currently running.
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*/
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boolean isRunning() {
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return mRunning || mFinishTime > 0;
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}
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void draw(Canvas canvas) {
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final int width = mBounds.width();
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final int height = mBounds.height();
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final int cx = width / 2;
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final int cy = height / 2;
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boolean drawTriggerWhileFinishing = false;
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int restoreCount = canvas.save();
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canvas.clipRect(mBounds);
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if (mRunning || (mFinishTime > 0)) {
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long now = AnimationUtils.currentAnimationTimeMillis();
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long elapsed = (now - mStartTime) % ANIMATION_DURATION_MS;
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long iterations = (now - mStartTime) / ANIMATION_DURATION_MS;
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float rawProgress = (elapsed / (ANIMATION_DURATION_MS / 100f));
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// If we're not running anymore, that means we're running through
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// the finish animation.
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if (!mRunning) {
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// If the finish animation is done, don't draw anything, and
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// don't repost.
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if ((now - mFinishTime) >= FINISH_ANIMATION_DURATION_MS) {
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mFinishTime = 0;
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return;
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}
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// Otherwise, use a 0 opacity alpha layer to clear the animation
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// from the inside out. This layer will prevent the circles from
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// drawing within its bounds.
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long finishElapsed = (now - mFinishTime) % FINISH_ANIMATION_DURATION_MS;
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float finishProgress = (finishElapsed / (FINISH_ANIMATION_DURATION_MS / 100f));
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float pct = (finishProgress / 100f);
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// Radius of the circle is half of the screen.
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float clearRadius = width / 2 * INTERPOLATOR.getInterpolation(pct);
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mClipRect.set(cx - clearRadius, 0, cx + clearRadius, height);
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canvas.saveLayerAlpha(mClipRect, 0, 0);
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// Only draw the trigger if there is a space in the center of
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// this refreshing view that needs to be filled in by the
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// trigger. If the progress view is just still animating, let it
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// continue animating.
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drawTriggerWhileFinishing = true;
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}
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// First fill in with the last color that would have finished drawing.
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if (iterations == 0) {
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canvas.drawColor(mColor1);
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} else {
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if (rawProgress >= 0 && rawProgress < 25) {
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canvas.drawColor(mColor4);
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} else if (rawProgress >= 25 && rawProgress < 50) {
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canvas.drawColor(mColor1);
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} else if (rawProgress >= 50 && rawProgress < 75) {
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canvas.drawColor(mColor2);
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} else {
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canvas.drawColor(mColor3);
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}
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}
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// Then draw up to 4 overlapping concentric circles of varying radii, based on how far
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// along we are in the cycle.
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// progress 0-50 draw mColor2
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// progress 25-75 draw mColor3
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// progress 50-100 draw mColor4
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// progress 75 (wrap to 25) draw mColor1
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if ((rawProgress >= 0 && rawProgress <= 25)) {
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float pct = (((rawProgress + 25) * 2) / 100f);
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drawCircle(canvas, cx, cy, mColor1, pct);
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}
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if (rawProgress >= 0 && rawProgress <= 50) {
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float pct = ((rawProgress * 2) / 100f);
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drawCircle(canvas, cx, cy, mColor2, pct);
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}
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if (rawProgress >= 25 && rawProgress <= 75) {
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float pct = (((rawProgress - 25) * 2) / 100f);
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drawCircle(canvas, cx, cy, mColor3, pct);
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}
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if (rawProgress >= 50 && rawProgress <= 100) {
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float pct = (((rawProgress - 50) * 2) / 100f);
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drawCircle(canvas, cx, cy, mColor4, pct);
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}
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if ((rawProgress >= 75 && rawProgress <= 100)) {
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float pct = (((rawProgress - 75) * 2) / 100f);
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drawCircle(canvas, cx, cy, mColor1, pct);
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}
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if (mTriggerPercentage > 0 && drawTriggerWhileFinishing) {
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// There is some portion of trigger to draw. Restore the canvas,
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// then draw the trigger. Otherwise, the trigger does not appear
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// until after the bar has finished animating and appears to
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// just jump in at a larger width than expected.
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canvas.restoreToCount(restoreCount);
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restoreCount = canvas.save();
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canvas.clipRect(mBounds);
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drawTrigger(canvas, cx, cy);
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}
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// Keep running until we finish out the last cycle.
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ViewCompat.postInvalidateOnAnimation(mParent);
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} else {
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// Otherwise if we're in the middle of a trigger, draw that.
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if (mTriggerPercentage > 0 && mTriggerPercentage <= 1.0) {
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drawTrigger(canvas, cx, cy);
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}
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}
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canvas.restoreToCount(restoreCount);
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}
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private void drawTrigger(Canvas canvas, int cx, int cy) {
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mPaint.setColor(mColor1);
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// Use a rectangle to instead of a circle as per UX.
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// canvas.drawCircle(cx, cy, cx * mTriggerPercentage, mPaint);
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canvas.drawRect(cx - cx * mTriggerPercentage, 0, cx + cx * mTriggerPercentage,
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mBounds.bottom, mPaint);
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}
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/**
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* Draws a circle centered in the view.
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*
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* @param canvas the canvas to draw on
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* @param cx the center x coordinate
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* @param cy the center y coordinate
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* @param color the color to draw
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* @param pct the percentage of the view that the circle should cover
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*/
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private void drawCircle(Canvas canvas, float cx, float cy, int color, float pct) {
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mPaint.setColor(color);
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canvas.save();
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canvas.translate(cx, cy);
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float radiusScale = INTERPOLATOR.getInterpolation(pct);
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canvas.scale(radiusScale, radiusScale);
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canvas.drawCircle(0, 0, cx, mPaint);
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canvas.restore();
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}
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/**
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* Set the drawing bounds of this SwipeProgressBar.
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*/
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void setBounds(int left, int top, int right, int bottom) {
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mBounds.left = left;
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mBounds.top = top;
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mBounds.right = right;
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mBounds.bottom = bottom;
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}
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}
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private static final class BakedBezierInterpolator implements Interpolator {
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private static final BakedBezierInterpolator INSTANCE = new BakedBezierInterpolator();
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public final static BakedBezierInterpolator getInstance() {
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return INSTANCE;
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}
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/**
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* Use getInstance instead of instantiating.
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*/
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private BakedBezierInterpolator() {
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super();
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}
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/**
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* Lookup table values.
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* Generated using a Bezier curve from (0,0) to (1,1) with control points:
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* P0 (0,0)
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* P1 (0.4, 0)
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* P2 (0.2, 1.0)
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* P3 (1.0, 1.0)
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*
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* Values sampled with x at regular intervals between 0 and 1.
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*/
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private static final float[] VALUES = new float[] {
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0.0f, 0.0002f, 0.0009f, 0.0019f, 0.0036f, 0.0059f, 0.0086f, 0.0119f, 0.0157f, 0.0209f,
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0.0257f, 0.0321f, 0.0392f, 0.0469f, 0.0566f, 0.0656f, 0.0768f, 0.0887f, 0.1033f, 0.1186f,
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0.1349f, 0.1519f, 0.1696f, 0.1928f, 0.2121f, 0.237f, 0.2627f, 0.2892f, 0.3109f, 0.3386f,
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0.3667f, 0.3952f, 0.4241f, 0.4474f, 0.4766f, 0.5f, 0.5234f, 0.5468f, 0.5701f, 0.5933f,
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0.6134f, 0.6333f, 0.6531f, 0.6698f, 0.6891f, 0.7054f, 0.7214f, 0.7346f, 0.7502f, 0.763f,
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0.7756f, 0.7879f, 0.8f, 0.8107f, 0.8212f, 0.8326f, 0.8415f, 0.8503f, 0.8588f, 0.8672f,
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0.8754f, 0.8833f, 0.8911f, 0.8977f, 0.9041f, 0.9113f, 0.9165f, 0.9232f, 0.9281f, 0.9328f,
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0.9382f, 0.9434f, 0.9476f, 0.9518f, 0.9557f, 0.9596f, 0.9632f, 0.9662f, 0.9695f, 0.9722f,
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0.9753f, 0.9777f, 0.9805f, 0.9826f, 0.9847f, 0.9866f, 0.9884f, 0.9901f, 0.9917f, 0.9931f,
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0.9944f, 0.9955f, 0.9964f, 0.9973f, 0.9981f, 0.9986f, 0.9992f, 0.9995f, 0.9998f, 1.0f, 1.0f
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};
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private static final float STEP_SIZE = 1.0f / (VALUES.length - 1);
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@Override
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public float getInterpolation(float input) {
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if (input >= 1.0f) {
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return 1.0f;
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}
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if (input <= 0f) {
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return 0f;
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}
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int position = Math.min(
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(int)(input * (VALUES.length - 1)),
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VALUES.length - 2);
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float quantized = position * STEP_SIZE;
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float difference = input - quantized;
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float weight = difference / STEP_SIZE;
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return VALUES[position] + weight * (VALUES[position + 1] - VALUES[position]);
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}
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}
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}
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