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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/chromeos/accelerometer/accelerometer_util.h"
#include <cmath>
#include "chromeos/accelerometer/accelerometer_types.h"
#include "ui/gfx/geometry/vector3d_f.h"
namespace {
// The maximum deviation from the acceleration expected due to gravity for which
// the device will be considered stable: 1g.
const float kDeviationFromGravityThreshold = 1.0f;
// The mean acceleration due to gravity on Earth in m/s^2.
const float kMeanGravity = 9.80665f;
} // namespace
namespace ui {
const gfx::Vector3dF ConvertAccelerometerReadingToVector3dF(
const chromeos::AccelerometerReading& reading) {
return gfx::Vector3dF(reading.x, reading.y, reading.z);
}
bool IsAccelerometerReadingStable(const chromeos::AccelerometerUpdate& update,
chromeos::AccelerometerSource source) {
return update.has(source) &&
std::abs(ConvertAccelerometerReadingToVector3dF(update.get(source))
.Length() -
kMeanGravity) <= kDeviationFromGravityThreshold;
}
} // namespace ui
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