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    public HeadsUpAppearInterpolator() {
27        super(getAppearPath());
28    }
29
30    private static Path getAppearPath() {
31        Path path = new Path();
32        path.moveTo(0, 0);
33        float x1 = 250f;
34        float x2 = 150f;
35        float x3 = 100f;
36        float y1 = 90f;
37        float y2 = 78f;
38        float y3 = 80f;
39        float xTot = (x1 + x2 + x3);
40        path.cubicTo(x1 * 0.9f / xTot, 0f,
41                x1 * 0.8f / xTot, y1 / y3,
42                x1 / xTot , y1 / y3);
43        path.cubicTo((x1 + x2 * 0.4f) / xTot, y1 / y3,
44                (x1 + x2 * 0.2f) / xTot, y2 / y3,
45                (x1 + x2) / xTot, y2 / y3);
46        path.cubicTo((x1 + x2 + x3 * 0.4f) / xTot, y2 / y3,
47                (x1 + x2 + x3 * 0.2f) / xTot, 1f,
48                1f, 1f);
49        return path;
50    }
51}
52