1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef UI_ACCEROMETER_ACCELEROMETER_TYPES_H_ 6 #define UI_ACCEROMETER_ACCELEROMETER_TYPES_H_ 7 8 #include "base/macros.h" 9 #include "ui/accelerometer/ui_accelerometer_export.h" 10 #include "ui/gfx/geometry/vector3d_f.h" 11 12 namespace ui { 13 14 enum AccelerometerSource { 15 // Accelerometer is located in the device's screen. In the screen's natural 16 // orientation, positive X points to the right, consistent with the pixel 17 // position. Positive Y points up the screen. Positive Z is perpendicular to 18 // the screen, pointing outwards towards the user. The orientation is 19 // described at: 20 // http://www.html5rocks.com/en/tutorials/device/orientation/. 21 ACCELEROMETER_SOURCE_SCREEN = 0, 22 23 // Accelerometer is located in a keyboard attached to the device's screen. 24 // If the device is open 180 degrees the orientation is consistent with the 25 // screen. I.e. Positive X points to the right, positive Y points up on the 26 // keyboard and positive Z is perpendicular to the keyboard pointing out 27 // towards the user. 28 ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD, 29 30 ACCELEROMETER_SOURCE_COUNT 31 }; 32 33 struct UI_ACCELEROMETER_EXPORT AccelerometerReading { 34 AccelerometerReading(); 35 ~AccelerometerReading(); 36 37 // If true, this accelerometer is being updated. 38 bool present; 39 40 // The reading from this accelerometer measured in m/s^2. 41 gfx::Vector3dF reading; 42 }; 43 44 // An accelerometer update contains the last known value for each of the 45 // accelerometers present on the device. 46 class UI_ACCELEROMETER_EXPORT AccelerometerUpdate { 47 public: 48 AccelerometerUpdate(); 49 ~AccelerometerUpdate(); 50 51 // Returns true if |source| has a valid value in this update. 52 bool has(AccelerometerSource source) const { 53 return data_[source].present; 54 } 55 56 // Returns the last known value for |source|. 57 const gfx::Vector3dF& get(AccelerometerSource source) const { 58 return data_[source].reading; 59 } 60 61 void Set(AccelerometerSource source, float x, float y, float z) { 62 data_[source].present = true; 63 data_[source].reading.set_x(x); 64 data_[source].reading.set_y(y); 65 data_[source].reading.set_z(z); 66 } 67 68 protected: 69 AccelerometerReading data_[ACCELEROMETER_SOURCE_COUNT]; 70 71 DISALLOW_COPY_AND_ASSIGN(AccelerometerUpdate); 72 }; 73 74 } // namespace chromeos 75 76 #endif // UI_ACCEROMETER_ACCELEROMETER_TYPES_H_ 77
