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 /** 20 * A classifier which looks at the ratio between the length of the stroke and its number of 21 * points. The number of points is subtracted by 2 because the UP event comes in with some delay 22 * and it should not influence the ratio and also strokes which are long and have a small number 23 * of points are punished more (these kind of strokes are usually bad ones and they tend to score 24 * well in other classifiers). 25 */ 26 public class LengthCountClassifier extends StrokeClassifier { LengthCountClassifier(ClassifierData classifierData)27 public LengthCountClassifier(ClassifierData classifierData) { 28 } 29 30 @Override getTag()31 public String getTag() { 32 return "LEN_CNT"; 33 } 34 35 @Override getFalseTouchEvaluation(int type, Stroke stroke)36 public float getFalseTouchEvaluation(int type, Stroke stroke) { 37 return LengthCountEvaluator.evaluate(stroke.getTotalLength() 38 / Math.max(1.0f, stroke.getCount() - 2)); 39 } 40 }