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.classifier;
18
19/**
20 * A classifier which looks at the ratio between the total length covered by the stroke and the
21 * distance between the first and last point from this stroke.
22 */
23public class EndPointRatioClassifier extends StrokeClassifier {
24    public EndPointRatioClassifier(ClassifierData classifierData) {
25        mClassifierData = classifierData;
26    }
27
28    @Override
29    public String getTag() {
30        return "END_RTIO";
31    }
32
33    @Override
34    public float getFalseTouchEvaluation(int type, Stroke stroke) {
35        float ratio;
36        if (stroke.getTotalLength() == 0.0f) {
37            ratio = 1.0f;
38        } else {
39            ratio = stroke.getEndPointLength() / stroke.getTotalLength();
40        }
41        return EndPointRatioEvaluator.evaluate(ratio);
42    }
43}