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/*
* Copyright (C) 2014 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.keyguard.analytics;
import android.graphics.RectF;
import android.util.FloatMath;
import android.util.SparseArray;
import android.view.MotionEvent;
import java.util.HashMap;
import java.util.Map;
import static com.android.keyguard.analytics.KeyguardAnalyticsProtos.Session.TouchEvent.BoundingBox;
/**
* Takes motion events and tracks the length and bounding box of each pointer gesture as well as
* the bounding box of the whole gesture.
*/
public class PointerTracker {
private SparseArray<Pointer> mPointerInfoMap = new SparseArray<Pointer>();
private RectF mTotalBoundingBox = new RectF();
public void addMotionEvent(MotionEvent ev) {
if (ev.getActionMasked() == MotionEvent.ACTION_DOWN) {
float x = ev.getX();
float y = ev.getY();
mTotalBoundingBox.set(x, y, x, y);
}
for (int i = 0; i < ev.getPointerCount(); i++) {
int id = ev.getPointerId(i);
Pointer pointer = getPointer(id);
float x = ev.getX(i);
float y = ev.getY(i);
boolean down = ev.getActionMasked() == MotionEvent.ACTION_DOWN
|| (ev.getActionMasked() == MotionEvent.ACTION_POINTER_DOWN
&& ev.getActionIndex() == i);
pointer.addPoint(x, y, down);
mTotalBoundingBox.union(x, y);
}
}
public float getPointerLength(int id) {
return getPointer(id).length;
}
public BoundingBox getBoundingBox() {
return boundingBoxFromRect(mTotalBoundingBox);
}
public BoundingBox getPointerBoundingBox(int id) {
return boundingBoxFromRect(getPointer(id).boundingBox);
}
private BoundingBox boundingBoxFromRect(RectF f) {
BoundingBox bb = new BoundingBox();
bb.setHeight(f.height());
bb.setWidth(f.width());
return bb;
}
private Pointer getPointer(int id) {
Pointer p = mPointerInfoMap.get(id);
if (p == null) {
p = new Pointer();
mPointerInfoMap.put(id, p);
}
return p;
}
private static class Pointer {
public float length;
public final RectF boundingBox = new RectF();
private float mLastX;
private float mLastY;
public void addPoint(float x, float y, boolean down) {
float deltaX;
float deltaY;
if (down) {
boundingBox.set(x, y, x, y);
length = 0f;
deltaX = 0;
deltaY = 0;
} else {
deltaX = x - mLastX;
deltaY = y - mLastY;
}
mLastX = x;
mLastY = y;
length += FloatMath.sqrt(deltaX * deltaX + deltaY * deltaY);
boundingBox.union(x, y);
}
}
}
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