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/*
* Copyright (C) 2019 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.brightline;
import static com.android.internal.config.sysui.SystemUiDeviceConfigFlags.BRIGHTLINE_FALSING_ZIGZAG_X_PRIMARY_DEVIANCE;
import static com.android.internal.config.sysui.SystemUiDeviceConfigFlags.BRIGHTLINE_FALSING_ZIGZAG_X_SECONDARY_DEVIANCE;
import static com.android.internal.config.sysui.SystemUiDeviceConfigFlags.BRIGHTLINE_FALSING_ZIGZAG_Y_PRIMARY_DEVIANCE;
import static com.android.internal.config.sysui.SystemUiDeviceConfigFlags.BRIGHTLINE_FALSING_ZIGZAG_Y_SECONDARY_DEVIANCE;
import android.graphics.Point;
import android.provider.DeviceConfig;
import android.view.MotionEvent;
import java.util.ArrayList;
import java.util.List;
/**
* Penalizes gestures that change direction in either the x or y too much.
*/
class ZigZagClassifier extends FalsingClassifier {
// Define how far one can move back and forth over one inch of travel before being falsed.
// `PRIMARY` defines how far one can deviate in the primary direction of travel. I.e. if you're
// swiping vertically, you shouldn't have a lot of zig zag in the vertical direction. Since
// most swipes will follow somewhat of a 'C' or 'S' shape, we allow more deviance along the
// `SECONDARY` axis.
private static final float MAX_X_PRIMARY_DEVIANCE = .05f;
private static final float MAX_Y_PRIMARY_DEVIANCE = .05f;
private static final float MAX_X_SECONDARY_DEVIANCE = .3f;
private static final float MAX_Y_SECONDARY_DEVIANCE = .3f;
private final float mMaxXPrimaryDeviance;
private final float mMaxYPrimaryDeviance;
private final float mMaxXSecondaryDeviance;
private final float mMaxYSecondaryDeviance;
ZigZagClassifier(FalsingDataProvider dataProvider) {
super(dataProvider);
mMaxXPrimaryDeviance = DeviceConfig.getFloat(
DeviceConfig.NAMESPACE_SYSTEMUI,
BRIGHTLINE_FALSING_ZIGZAG_X_PRIMARY_DEVIANCE,
MAX_X_PRIMARY_DEVIANCE);
mMaxYPrimaryDeviance = DeviceConfig.getFloat(
DeviceConfig.NAMESPACE_SYSTEMUI,
BRIGHTLINE_FALSING_ZIGZAG_Y_PRIMARY_DEVIANCE,
MAX_Y_PRIMARY_DEVIANCE);
mMaxXSecondaryDeviance = DeviceConfig.getFloat(
DeviceConfig.NAMESPACE_SYSTEMUI,
BRIGHTLINE_FALSING_ZIGZAG_X_SECONDARY_DEVIANCE,
MAX_X_SECONDARY_DEVIANCE);
mMaxYSecondaryDeviance = DeviceConfig.getFloat(
DeviceConfig.NAMESPACE_SYSTEMUI,
BRIGHTLINE_FALSING_ZIGZAG_Y_SECONDARY_DEVIANCE,
MAX_Y_SECONDARY_DEVIANCE);
}
@Override
boolean isFalseTouch() {
List<MotionEvent> motionEvents = getRecentMotionEvents();
// Rotate horizontal gestures to be horizontal between their first and last point.
// Rotate vertical gestures to be vertical between their first and last point.
// Sum the absolute value of every dx and dy along the gesture. Compare this with the dx
// and dy
// between the first and last point.
// For horizontal lines, the difference in the x direction should be small.
// For vertical lines, the difference in the y direction should be small.
if (motionEvents.size() < 3) {
return false;
}
List<Point> rotatedPoints;
if (isHorizontal()) {
rotatedPoints = rotateHorizontal();
} else {
rotatedPoints = rotateVertical();
}
float actualDx = Math
.abs(rotatedPoints.get(0).x - rotatedPoints.get(rotatedPoints.size() - 1).x);
float actualDy = Math
.abs(rotatedPoints.get(0).y - rotatedPoints.get(rotatedPoints.size() - 1).y);
logDebug("Actual: (" + actualDx + "," + actualDy + ")");
float runningAbsDx = 0;
float runningAbsDy = 0;
float pX = 0;
float pY = 0;
boolean firstLoop = true;
for (Point point : rotatedPoints) {
if (firstLoop) {
pX = point.x;
pY = point.y;
firstLoop = false;
continue;
}
runningAbsDx += Math.abs(point.x - pX);
runningAbsDy += Math.abs(point.y - pY);
pX = point.x;
pY = point.y;
logDebug("(x, y, runningAbsDx, runningAbsDy) - (" + pX + ", " + pY + ", " + runningAbsDx
+ ", " + runningAbsDy + ")");
}
float devianceX = runningAbsDx - actualDx;
float devianceY = runningAbsDy - actualDy;
float distanceXIn = actualDx / getXdpi();
float distanceYIn = actualDy / getYdpi();
float totalDistanceIn = (float) Math
.sqrt(distanceXIn * distanceXIn + distanceYIn * distanceYIn);
float maxXDeviance;
float maxYDeviance;
if (actualDx > actualDy) {
maxXDeviance = mMaxXPrimaryDeviance * totalDistanceIn * getXdpi();
maxYDeviance = mMaxYSecondaryDeviance * totalDistanceIn * getYdpi();
} else {
maxXDeviance = mMaxXSecondaryDeviance * totalDistanceIn * getXdpi();
maxYDeviance = mMaxYPrimaryDeviance * totalDistanceIn * getYdpi();
}
logDebug("Straightness Deviance: (" + devianceX + "," + devianceY + ") vs "
+ "(" + maxXDeviance + "," + maxYDeviance + ")");
return devianceX > maxXDeviance || devianceY > maxYDeviance;
}
private float getAtan2LastPoint() {
MotionEvent firstEvent = getFirstMotionEvent();
MotionEvent lastEvent = getLastMotionEvent();
float offsetX = firstEvent.getX();
float offsetY = firstEvent.getY();
float lastX = lastEvent.getX() - offsetX;
float lastY = lastEvent.getY() - offsetY;
return (float) Math.atan2(lastY, lastX);
}
private List<Point> rotateVertical() {
// Calculate the angle relative to the y axis.
double angle = Math.PI / 2 - getAtan2LastPoint();
logDebug("Rotating to vertical by: " + angle);
return rotateMotionEvents(getRecentMotionEvents(), -angle);
}
private List<Point> rotateHorizontal() {
// Calculate the angle relative to the x axis.
double angle = getAtan2LastPoint();
logDebug("Rotating to horizontal by: " + angle);
return rotateMotionEvents(getRecentMotionEvents(), angle);
}
private List<Point> rotateMotionEvents(List<MotionEvent> motionEvents, double angle) {
List<Point> points = new ArrayList<>();
double cosAngle = Math.cos(angle);
double sinAngle = Math.sin(angle);
MotionEvent firstEvent = motionEvents.get(0);
float offsetX = firstEvent.getX();
float offsetY = firstEvent.getY();
for (MotionEvent motionEvent : motionEvents) {
float x = motionEvent.getX() - offsetX;
float y = motionEvent.getY() - offsetY;
double rotatedX = cosAngle * x + sinAngle * y + offsetX;
double rotatedY = -sinAngle * x + cosAngle * y + offsetY;
points.add(new Point((int) rotatedX, (int) rotatedY));
}
MotionEvent lastEvent = motionEvents.get(motionEvents.size() - 1);
Point firstPoint = points.get(0);
Point lastPoint = points.get(points.size() - 1);
logDebug(
"Before: (" + firstEvent.getX() + "," + firstEvent.getY() + "), ("
+ lastEvent.getX() + ","
+ lastEvent.getY() + ")");
logDebug(
"After: (" + firstPoint.x + "," + firstPoint.y + "), (" + lastPoint.x + ","
+ lastPoint.y
+ ")");
return points;
}
}
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