/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package com.android.systemui.classifier;
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/**
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* A classifier which looks at the ratio between the length of the stroke and its number of
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* points. The number of points is subtracted by 2 because the UP event comes in with some delay
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* and it should not influence the ratio and also strokes which are long and have a small number
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* of points are punished more (these kind of strokes are usually bad ones and they tend to score
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* well in other classifiers).
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*/
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public class LengthCountClassifier extends StrokeClassifier {
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public LengthCountClassifier(ClassifierData classifierData) {
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}
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@Override
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public String getTag() {
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return "LEN_CNT";
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}
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@Override
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public float getFalseTouchEvaluation(int type, Stroke stroke) {
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return LengthCountEvaluator.evaluate(stroke.getTotalLength()
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/ Math.max(1.0f, stroke.getCount() - 2));
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}
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}
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