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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 /**
     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  */
     23 public 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 }