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/*
* Copyright (C) 2020 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;
import static com.android.internal.config.sysui.SystemUiDeviceConfigFlags.BRIGHTLINE_FALSING_DIAGONAL_HORIZONTAL_ANGLE_RANGE;
import static com.android.internal.config.sysui.SystemUiDeviceConfigFlags.BRIGHTLINE_FALSING_DIAGONAL_VERTICAL_ANGLE_RANGE;
import static com.android.systemui.classifier.Classifier.LEFT_AFFORDANCE;
import static com.android.systemui.classifier.Classifier.LOCK_ICON;
import static com.android.systemui.classifier.Classifier.RIGHT_AFFORDANCE;
import android.provider.DeviceConfig;
import com.android.systemui.util.DeviceConfigProxy;
import java.util.Locale;
import javax.inject.Inject;
/**
* False on swipes that are too close to 45 degrees.
*
* Horizontal swipes may have a different threshold than vertical.
*
* This falser should not run on "affordance" swipes, as they will always be close to 45.
*/
class DiagonalClassifier extends FalsingClassifier {
private static final float HORIZONTAL_ANGLE_RANGE = (float) (5f / 360f * Math.PI * 2f);
private static final float VERTICAL_ANGLE_RANGE = (float) (5f / 360f * Math.PI * 2f);
private static final float DIAGONAL = (float) (Math.PI / 4); // 45 deg
private static final float NINETY_DEG = (float) (Math.PI / 2);
private static final float ONE_HUNDRED_EIGHTY_DEG = (float) (Math.PI);
private static final float THREE_HUNDRED_SIXTY_DEG = (float) (2 * Math.PI);
private final float mHorizontalAngleRange;
private final float mVerticalAngleRange;
@Inject
DiagonalClassifier(FalsingDataProvider dataProvider, DeviceConfigProxy deviceConfigProxy) {
super(dataProvider);
mHorizontalAngleRange = deviceConfigProxy.getFloat(
DeviceConfig.NAMESPACE_SYSTEMUI,
BRIGHTLINE_FALSING_DIAGONAL_HORIZONTAL_ANGLE_RANGE,
HORIZONTAL_ANGLE_RANGE);
mVerticalAngleRange = deviceConfigProxy.getFloat(
DeviceConfig.NAMESPACE_SYSTEMUI,
BRIGHTLINE_FALSING_DIAGONAL_VERTICAL_ANGLE_RANGE,
VERTICAL_ANGLE_RANGE);
}
Result calculateFalsingResult(
@Classifier.InteractionType int interactionType,
double historyBelief, double historyConfidence) {
float angle = getAngle();
if (angle == Float.MAX_VALUE) { // Unknown angle
return Result.passed(0);
}
if (interactionType == LEFT_AFFORDANCE
|| interactionType == RIGHT_AFFORDANCE
|| interactionType == LOCK_ICON) {
return Result.passed(0);
}
float minAngle = DIAGONAL - mHorizontalAngleRange;
float maxAngle = DIAGONAL + mHorizontalAngleRange;
if (isVertical()) {
minAngle = DIAGONAL - mVerticalAngleRange;
maxAngle = DIAGONAL + mVerticalAngleRange;
}
boolean falsed = angleBetween(angle, minAngle, maxAngle)
|| angleBetween(angle, minAngle + NINETY_DEG, maxAngle + NINETY_DEG)
|| angleBetween(angle, minAngle - NINETY_DEG, maxAngle - NINETY_DEG)
|| angleBetween(angle, minAngle + ONE_HUNDRED_EIGHTY_DEG,
maxAngle + ONE_HUNDRED_EIGHTY_DEG);
return falsed ? falsed(0.5f, getReason()) : Result.passed(0.5);
}
private String getReason() {
return String.format(
(Locale) null,
"{angle=%f, vertical=%s}",
getAngle(),
isVertical());
}
private boolean angleBetween(float angle, float min, float max) {
// No need to normalize angle as it is guaranteed to be between 0 and 2*PI.
min = normalizeAngle(min);
max = normalizeAngle(max);
if (min > max) { // Can happen when angle is close to 0.
return angle >= min || angle <= max;
}
return angle >= min && angle <= max;
}
private float normalizeAngle(float angle) {
if (angle < 0) {
return THREE_HUNDRED_SIXTY_DEG + (angle % THREE_HUNDRED_SIXTY_DEG);
} else if (angle > THREE_HUNDRED_SIXTY_DEG) {
return angle % THREE_HUNDRED_SIXTY_DEG;
}
return angle;
}
}
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