| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License |
| */ |
| |
| package com.android.systemui.classifier; |
| |
| /** |
| * A classifier that looks at the speed of the stroke. It calculates the speed of a stroke in |
| * inches per second. |
| */ |
| public class SpeedClassifier extends StrokeClassifier { |
| private final float NANOS_TO_SECONDS = 1e9f; |
| |
| public SpeedClassifier(ClassifierData classifierData) { |
| } |
| |
| @Override |
| public String getTag() { |
| return "SPD"; |
| } |
| |
| @Override |
| public float getFalseTouchEvaluation(int type, Stroke stroke) { |
| float duration = (float) stroke.getDurationNanos() / NANOS_TO_SECONDS; |
| if (duration == 0.0f) { |
| return SpeedEvaluator.evaluate(0.0f); |
| } |
| return SpeedEvaluator.evaluate(stroke.getTotalLength() / duration); |
| } |
| } |