DVector2.java
/*
* Copyright 2022 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 androidx.input.motionprediction.kalman.matrix;
import static androidx.annotation.RestrictTo.Scope.LIBRARY;
import androidx.annotation.NonNull;
import androidx.annotation.RestrictTo;
/**
* A 2 element fixed sized vector, where each element is a double. This class can represent a (2x1)
* or (1x2) matrix.
*
* @hide
*/
@RestrictTo(LIBRARY)
public class DVector2 {
public double a1;
public double a2;
public DVector2() {}
/** Returns the vector magnitude (abs, length). */
public double magnitude() {
return Math.hypot(a1, a2);
}
/** Sets the elements to the values from {@code newValue}. */
public void set(@NonNull DVector2 newValue) {
a1 = newValue.a1;
a2 = newValue.a2;
}
}