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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.launcher3.anim;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;
import android.view.animation.PathInterpolator;
/**
* Common interpolators used in Launcher
*/
public class Interpolators {
public static final Interpolator LINEAR = new LinearInterpolator();
public static final Interpolator ACCEL = new AccelerateInterpolator();
public static final Interpolator ACCEL_1_5 = new AccelerateInterpolator(1.5f);
public static final Interpolator ACCEL_2 = new AccelerateInterpolator(2);
public static final Interpolator DEACCEL = new DecelerateInterpolator();
public static final Interpolator DEACCEL_1_5 = new DecelerateInterpolator(1.5f);
public static final Interpolator DEACCEL_2 = new DecelerateInterpolator(2);
public static final Interpolator DEACCEL_2_5 = new DecelerateInterpolator(2.5f);
public static final Interpolator DEACCEL_3 = new DecelerateInterpolator(3f);
public static final Interpolator FAST_OUT_SLOW_IN = new PathInterpolator(0.4f, 0f, 0.2f, 1f);
public static final Interpolator AGGRESSIVE_EASE = new PathInterpolator(0.2f, 0f, 0f, 1f);
/**
* Inversion of zInterpolate, compounded with an ease-out.
*/
public static final Interpolator ZOOM_IN = new Interpolator() {
private static final float FOCAL_LENGTH = 0.35f;
@Override
public float getInterpolation(float v) {
return DEACCEL_3.getInterpolation(1 - zInterpolate(1 - v));
}
/**
* This interpolator emulates the rate at which the perceived scale of an object changes
* as its distance from a camera increases. When this interpolator is applied to a scale
* animation on a view, it evokes the sense that the object is shrinking due to moving away
* from the camera.
*/
private float zInterpolate(float input) {
return (1.0f - FOCAL_LENGTH / (FOCAL_LENGTH + input)) /
(1.0f - FOCAL_LENGTH / (FOCAL_LENGTH + 1.0f));
}
};
public static final Interpolator SCROLL = new Interpolator() {
@Override
public float getInterpolation(float t) {
t -= 1.0f;
return t*t*t*t*t + 1;
}
};
public static final Interpolator SCROLL_CUBIC = new Interpolator() {
@Override
public float getInterpolation(float t) {
t -= 1.0f;
return t*t*t + 1;
}
};
private static final float FAST_FLING_PX_MS = 10;
public static Interpolator scrollInterpolatorForVelocity(float velocity) {
return Math.abs(velocity) > FAST_FLING_PX_MS ? SCROLL : SCROLL_CUBIC;
}
}
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