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      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 
     34     public Stroke(long eventTimeNano, float dpi) {
     35         mDpi = dpi;
     36         mStartTimeNano = mEndTimeNano = eventTimeNano;
     37     }
     38 
     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 
     48     public int getCount() {
     49         return mPoints.size();
     50     }
     51 
     52     public float getTotalLength() {
     53         return mLength;
     54     }
     55 
     56     public float getEndPointLength() {
     57         return mPoints.get(0).dist(mPoints.get(mPoints.size() - 1));
     58     }
     59 
     60     public long getDurationNanos() {
     61         return mEndTimeNano - mStartTimeNano;
     62     }
     63 
     64     public float getDurationSeconds() {
     65         return (float) getDurationNanos() / NANOS_TO_SECONDS;
     66     }
     67 
     68     public ArrayList<Point> getPoints() {
     69         return mPoints;
     70     }
     71 }
     72