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 
17 package com.android.systemui.classifier;
18 
19 import java.util.ArrayList;
20 
21 /**
22  * Contains data about a stroke (a single trace, all the events from a given id from the
23  * DOWN/POINTER_DOWN event till the UP/POINTER_UP/CANCEL event.)
24  */
25 public class Stroke {
26     private final float NANOS_TO_SECONDS = 1e9f;
27 
28     private ArrayList<Point> mPoints = new ArrayList<>();
29     private long mStartTimeNano;
30     private long mEndTimeNano;
31     private float mLength;
32     private final float mDpi;
33 
Stroke(long eventTimeNano, float dpi)34     public Stroke(long eventTimeNano, float dpi) {
35         mDpi = dpi;
36         mStartTimeNano = mEndTimeNano = eventTimeNano;
37     }
38 
addPoint(float x, float y, long eventTimeNano)39     public void addPoint(float x, float y, long eventTimeNano) {
40         mEndTimeNano = eventTimeNano;
41         Point point = new Point(x / mDpi, y / mDpi, eventTimeNano - mStartTimeNano);
42         if (!mPoints.isEmpty()) {
43             mLength += mPoints.get(mPoints.size() - 1).dist(point);
44         }
45         mPoints.add(point);
46     }
47 
getCount()48     public int getCount() {
49         return mPoints.size();
50     }
51 
getTotalLength()52     public float getTotalLength() {
53         return mLength;
54     }
55 
getEndPointLength()56     public float getEndPointLength() {
57         return mPoints.get(0).dist(mPoints.get(mPoints.size() - 1));
58     }
59 
getDurationNanos()60     public long getDurationNanos() {
61         return mEndTimeNano - mStartTimeNano;
62     }
63 
getDurationSeconds()64     public float getDurationSeconds() {
65         return (float) getDurationNanos() / NANOS_TO_SECONDS;
66     }
67 
getPoints()68     public ArrayList<Point> getPoints() {
69         return mPoints;
70     }
71 
getLastEventTimeNano()72     public long getLastEventTimeNano() {
73         if (mPoints.isEmpty()) {
74             return mStartTimeNano;
75         }
76 
77         return mPoints.get(mPoints.size() - 1).timeOffsetNano;
78     }
79 }
80