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/*
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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 com.hippo.effect.ripple;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.Paint.Style;
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import android.graphics.Rect;
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import android.view.animation.Interpolator;
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import android.view.animation.LinearInterpolator;
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import com.hippo.util.MathUtils;
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import com.nineoldandroids.animation.Animator;
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import com.nineoldandroids.animation.AnimatorListenerAdapter;
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import com.nineoldandroids.animation.ObjectAnimator;
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/**
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* Draws a Material ripple.
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*/
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class Ripple {
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@SuppressWarnings("unused")
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private static final String TAG = Ripple.class.getSimpleName();
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private static final Interpolator LINEAR_INTERPOLATOR = new LinearInterpolator();
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private static final Interpolator DECEL_INTERPOLATOR = new LogInterpolator();
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private static final float GLOBAL_SPEED = 1.0f;
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private static final float WAVE_TOUCH_DOWN_ACCELERATION = 1024.0f * GLOBAL_SPEED;
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private static final float WAVE_TOUCH_UP_ACCELERATION = 3400.0f * GLOBAL_SPEED;
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private static final float WAVE_OPACITY_DECAY_VELOCITY = 3.0f / GLOBAL_SPEED;
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private static final long RIPPLE_ENTER_DELAY = 80;
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private final RippleOwner mOwner;
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/** Bounds used for computing max radius. */
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private final Rect mBounds;
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/** Full-opacity color for drawing this ripple. */
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private int mColorOpaque;
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/** Maximum ripple radius. */
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private float mOuterRadius;
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/** Screen density used to adjust pixel-based velocities. */
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private float mDensity;
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private float mStartingX;
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private float mStartingY;
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private float mClampedStartingX;
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private float mClampedStartingY;
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// Software animators.
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private ObjectAnimator mAnimRadius;
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private ObjectAnimator mAnimOpacity;
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private ObjectAnimator mAnimX;
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private ObjectAnimator mAnimY;
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// Software rendering properties.
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private float mOpacity = 1;
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private float mOuterX;
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private float mOuterY;
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// Values used to tween between the start and end positions.
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private float mTweenRadius = 0;
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private float mTweenX = 0;
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private float mTweenY = 0;
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/** Whether we have an explicit maximum radius. */
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private boolean mHasMaxRadius;
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/** Whether we were canceled externally and should avoid self-removal. */
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private boolean mCanceled;
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/**
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* Creates a new ripple.
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*/
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public Ripple(RippleOwner owner, Rect bounds, float startingX, float startingY) {
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mOwner = owner;
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mBounds = bounds;
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mStartingX = startingX;
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mStartingY = startingY;
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}
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public void setup(int maxRadius, int color, float density) {
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mColorOpaque = color | 0xFF000000;
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mOpacity = Color.alpha(color) / 2 / 255.0f;
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if (maxRadius != RippleOwner.RADIUS_AUTO) {
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mHasMaxRadius = true;
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mOuterRadius = maxRadius;
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} else {
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final float halfWidth = mBounds.width() / 2.0f;
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final float halfHeight = mBounds.height() / 2.0f;
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mOuterRadius = (float) Math.sqrt(halfWidth * halfWidth + halfHeight * halfHeight);
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}
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mOuterX = 0;
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mOuterY = 0;
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mDensity = density;
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clampStartingPosition();
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}
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private void clampStartingPosition() {
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final float cX = mBounds.exactCenterX();
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final float cY = mBounds.exactCenterY();
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final float dX = mStartingX - cX;
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final float dY = mStartingY - cY;
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final float r = mOuterRadius;
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if (dX * dX + dY * dY > r * r) {
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// Point is outside the circle, clamp to the circumference.
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final double angle = Math.atan2(dY, dX);
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mClampedStartingX = cX + (float) (Math.cos(angle) * r);
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mClampedStartingY = cY + (float) (Math.sin(angle) * r);
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} else {
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mClampedStartingX = mStartingX;
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mClampedStartingY = mStartingY;
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}
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}
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public void onHotspotBoundsChanged() {
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if (!mHasMaxRadius) {
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final float halfWidth = mBounds.width() / 2.0f;
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final float halfHeight = mBounds.height() / 2.0f;
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mOuterRadius = (float) Math.sqrt(halfWidth * halfWidth + halfHeight * halfHeight);
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clampStartingPosition();
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}
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}
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public void setOpacity(float a) {
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mOpacity = a;
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invalidateSelf();
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}
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public float getOpacity() {
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return mOpacity;
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}
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public void setRadiusGravity(float r) {
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mTweenRadius = r;
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invalidateSelf();
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}
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public float getRadiusGravity() {
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return mTweenRadius;
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}
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public void setXGravity(float x) {
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mTweenX = x;
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invalidateSelf();
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}
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public float getXGravity() {
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return mTweenX;
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}
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public void setYGravity(float y) {
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mTweenY = y;
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invalidateSelf();
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}
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public float getYGravity() {
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return mTweenY;
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}
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/**
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* Draws the ripple centered at (0,0) using the specified paint.
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*/
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public boolean draw(Canvas c, Paint p) {
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return drawSoftware(c, p);
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}
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private boolean drawSoftware(Canvas c, Paint p) {
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boolean hasContent = false;
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p.setColor(mColorOpaque);
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final int alpha = MathUtils.clamp((int) (255 * mOpacity + 0.5f), 0, 255);
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final float radius = MathUtils.lerp(0, mOuterRadius, mTweenRadius);
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if (alpha > 0 && radius > 0) {
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final float x = MathUtils.lerp(
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mClampedStartingX - mBounds.exactCenterX(), mOuterX, mTweenX);
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final float y = MathUtils.lerp(
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mClampedStartingY - mBounds.exactCenterY(), mOuterY, mTweenY);
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p.setAlpha(alpha);
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p.setStyle(Style.FILL);
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c.drawCircle(x, y, radius, p);
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hasContent = true;
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}
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return hasContent;
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}
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/**
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* Returns the maximum bounds of the ripple relative to the ripple center.
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*/
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public void getBounds(Rect bounds) {
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final int outerX = (int) mOuterX;
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final int outerY = (int) mOuterY;
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final int r = (int) mOuterRadius + 1;
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bounds.set(outerX - r, outerY - r, outerX + r, outerY + r);
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}
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/**
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* Specifies the starting position relative to the drawable bounds. No-op if
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* the ripple has already entered.
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*/
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public void move(float x, float y) {
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mStartingX = x;
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mStartingY = y;
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clampStartingPosition();
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}
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/**
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* Starts the enter animation.
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*/
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public void enter() {
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cancel();
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final int radiusDuration = (int)
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(1000 * Math.sqrt(mOuterRadius / WAVE_TOUCH_DOWN_ACCELERATION * mDensity) + 0.5);
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final ObjectAnimator radius = ObjectAnimator.ofFloat(this, "radiusGravity", 1);
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radius.setAutoCancel(true);
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radius.setDuration(radiusDuration);
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radius.setInterpolator(LINEAR_INTERPOLATOR);
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radius.setStartDelay(RIPPLE_ENTER_DELAY);
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final ObjectAnimator cX = ObjectAnimator.ofFloat(this, "xGravity", 1);
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cX.setAutoCancel(true);
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cX.setDuration(radiusDuration);
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cX.setInterpolator(LINEAR_INTERPOLATOR);
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cX.setStartDelay(RIPPLE_ENTER_DELAY);
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final ObjectAnimator cY = ObjectAnimator.ofFloat(this, "yGravity", 1);
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cY.setAutoCancel(true);
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cY.setDuration(radiusDuration);
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cY.setInterpolator(LINEAR_INTERPOLATOR);
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cY.setStartDelay(RIPPLE_ENTER_DELAY);
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mAnimRadius = radius;
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mAnimX = cX;
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mAnimY = cY;
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// Enter animations always run on the UI thread, since it's unlikely
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// that anything interesting is happening until the user lifts their
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// finger.
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radius.start();
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cX.start();
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cY.start();
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}
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/**
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* Starts the exit animation.
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*/
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public void exit() {
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cancel();
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final float radius = MathUtils.lerp(0, mOuterRadius, mTweenRadius);
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final float remaining;
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if (mAnimRadius != null && mAnimRadius.isRunning()) {
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remaining = mOuterRadius - radius;
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} else {
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remaining = mOuterRadius;
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}
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final int radiusDuration = (int) (1000 * Math.sqrt(remaining / (WAVE_TOUCH_UP_ACCELERATION
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+ WAVE_TOUCH_DOWN_ACCELERATION) * mDensity) + 0.5);
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final int opacityDuration = (int) (1000 * 1 / WAVE_OPACITY_DECAY_VELOCITY + 0.5f);
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exitSoftware(radiusDuration, opacityDuration);
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}
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/**
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* Jump all animations to their end state. The caller is responsible for
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* removing the ripple from the list of animating ripples.
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*/
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public void jump() {
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mCanceled = true;
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endSoftwareAnimations();
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mCanceled = false;
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}
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private void endSoftwareAnimations() {
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if (mAnimRadius != null) {
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mAnimRadius.end();
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mAnimRadius = null;
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}
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if (mAnimOpacity != null) {
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mAnimOpacity.end();
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mAnimOpacity = null;
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}
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if (mAnimX != null) {
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mAnimX.end();
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mAnimX = null;
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}
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if (mAnimY != null) {
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mAnimY.end();
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mAnimY = null;
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}
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}
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private void exitSoftware(int radiusDuration, int opacityDuration) {
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final ObjectAnimator radiusAnim = ObjectAnimator.ofFloat(this, "radiusGravity", 1);
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radiusAnim.setAutoCancel(true);
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radiusAnim.setDuration(radiusDuration);
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radiusAnim.setInterpolator(DECEL_INTERPOLATOR);
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final ObjectAnimator xAnim = ObjectAnimator.ofFloat(this, "xGravity", 1);
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xAnim.setAutoCancel(true);
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xAnim.setDuration(radiusDuration);
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xAnim.setInterpolator(DECEL_INTERPOLATOR);
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final ObjectAnimator yAnim = ObjectAnimator.ofFloat(this, "yGravity", 1);
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yAnim.setAutoCancel(true);
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yAnim.setDuration(radiusDuration);
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yAnim.setInterpolator(DECEL_INTERPOLATOR);
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final ObjectAnimator opacityAnim = ObjectAnimator.ofFloat(this, "opacity", 0);
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opacityAnim.setAutoCancel(true);
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opacityAnim.setDuration(opacityDuration);
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opacityAnim.setInterpolator(LINEAR_INTERPOLATOR);
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opacityAnim.addListener(mAnimationListener);
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mAnimRadius = radiusAnim;
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mAnimOpacity = opacityAnim;
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mAnimX = xAnim;
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mAnimY = yAnim;
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radiusAnim.start();
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opacityAnim.start();
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xAnim.start();
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yAnim.start();
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}
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/**
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* Cancels all animations. The caller is responsible for removing
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* the ripple from the list of animating ripples.
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*/
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public void cancel() {
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mCanceled = true;
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cancelSoftwareAnimations();
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mCanceled = false;
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}
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private void cancelSoftwareAnimations() {
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if (mAnimRadius != null) {
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mAnimRadius.cancel();
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mAnimRadius = null;
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}
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if (mAnimOpacity != null) {
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mAnimOpacity.cancel();
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mAnimOpacity = null;
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}
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if (mAnimX != null) {
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mAnimX.cancel();
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mAnimX = null;
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}
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if (mAnimY != null) {
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mAnimY.cancel();
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mAnimY = null;
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}
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}
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private void removeSelf() {
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// The owner will invalidate itself.
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if (!mCanceled) {
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mOwner.removeRipple(this);
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}
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}
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private void invalidateSelf() {
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mOwner.invalidateSelf();
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}
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private final AnimatorListenerAdapter mAnimationListener = new AnimatorListenerAdapter() {
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@Override
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public void onAnimationEnd(Animator animation) {
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removeSelf();
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}
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};
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/**
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* Interpolator with a smooth log deceleration
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*/
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private static final class LogInterpolator implements Interpolator {
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@Override
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public float getInterpolation(float input) {
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return 1 - (float) Math.pow(400, -input * 1.4);
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}
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}
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}
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