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// Copyright 2014 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.
#ifndef UI_ACCELEROMETER_ACCELEROMETER_TYPES_H_
#define UI_ACCELEROMETER_ACCELEROMETER_TYPES_H_
#include "base/macros.h"
#include "ui/accelerometer/ui_accelerometer_export.h"
#include "ui/gfx/geometry/vector3d_f.h"
namespace ui {
enum AccelerometerSource {
// Accelerometer is located in the device's screen. In the screen's natural
// orientation, positive X points to the right, consistent with the pixel
// position. Positive Y points up the screen. Positive Z is perpendicular to
// the screen, pointing outwards towards the user. The orientation is
// described at:
// http://www.html5rocks.com/en/tutorials/device/orientation/.
ACCELEROMETER_SOURCE_SCREEN = 0,
// Accelerometer is located in a keyboard attached to the device's screen.
// If the device is open 180 degrees the orientation is consistent with the
// screen. I.e. Positive X points to the right, positive Y points up on the
// keyboard and positive Z is perpendicular to the keyboard pointing out
// towards the user.
ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD,
ACCELEROMETER_SOURCE_COUNT
};
struct UI_ACCELEROMETER_EXPORT AccelerometerReading {
AccelerometerReading();
~AccelerometerReading();
// If true, this accelerometer is being updated.
bool present;
// The reading from this accelerometer measured in m/s^2.
gfx::Vector3dF reading;
};
// An accelerometer update contains the last known value for each of the
// accelerometers present on the device.
class UI_ACCELEROMETER_EXPORT AccelerometerUpdate {
public:
AccelerometerUpdate();
~AccelerometerUpdate();
// Returns true if |source| has a valid value in this update.
bool has(AccelerometerSource source) const {
return data_[source].present;
}
// Returns the last known value for |source|.
const gfx::Vector3dF& get(AccelerometerSource source) const {
return data_[source].reading;
}
void Set(AccelerometerSource source, float x, float y, float z) {
data_[source].present = true;
data_[source].reading.set_x(x);
data_[source].reading.set_y(y);
data_[source].reading.set_z(z);
}
protected:
AccelerometerReading data_[ACCELEROMETER_SOURCE_COUNT];
DISALLOW_COPY_AND_ASSIGN(AccelerometerUpdate);
};
} // namespace ui
#endif // UI_ACCELEROMETER_ACCELEROMETER_TYPES_H_
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