1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License
15 */
16
17package com.android.systemui.statusbar.stack;
18
19import android.graphics.Path;
20import android.view.animation.PathInterpolator;
21
22/**
23 * An interpolator specifically designed for the appear animation of heads up notifications.
24 */
25public class HeadsUpAppearInterpolator extends PathInterpolator {
26
27    private static float X1 = 250f;
28    private static float X2 = 200f;
29    private static float XTOT = (X1 + X2);;
30
31    public HeadsUpAppearInterpolator() {
32        super(getAppearPath());
33    }
34
35    private static Path getAppearPath() {
36        Path path = new Path();
37        path.moveTo(0, 0);
38        float y1 = 90f;
39        float y2 = 80f;
40        path.cubicTo(X1 * 0.8f / XTOT, y1 / y2,
41                X1 * 0.8f / XTOT, y1 / y2,
42                X1 / XTOT, y1 / y2);
43        path.cubicTo((X1 + X2 * 0.4f) / XTOT, y1 / y2,
44                (X1 + X2 * 0.2f) / XTOT, 1.0f,
45                1.0f , 1.0f);
46        return path;
47    }
48
49    public static float getFractionUntilOvershoot() {
50        return X1 / XTOT;
51    }
52}
53