/*
|
* 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);
|
}
|
}
|
