Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 1 | // Copyright (c) 2012 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 PPAPI_CPP_TOUCH_POINT_H_ |
| 6 | #define PPAPI_CPP_TOUCH_POINT_H_ |
| 7 | |
| 8 | #include "ppapi/c/ppb_input_event.h" |
| 9 | #include "ppapi/cpp/input_event.h" |
| 10 | #include "ppapi/cpp/point.h" |
| 11 | |
| 12 | namespace pp { |
| 13 | |
| 14 | /// Wrapper class for PP_TouchPoint. |
| 15 | class TouchPoint { |
| 16 | public: |
| 17 | TouchPoint() : touch_point_(PP_MakeTouchPoint()) {} |
| 18 | |
| 19 | TouchPoint(const PP_TouchPoint& point) : touch_point_(point) {} |
| 20 | |
| 21 | /// @return The identifier for this TouchPoint. This corresponds to the order |
| 22 | /// in which the points were pressed. For example, the first point to be |
| 23 | /// pressed has an id of 0, the second has an id of 1, and so on. An id can be |
| 24 | /// reused when a touch point is released. For example, if two fingers are |
| 25 | /// down, with id 0 and 1, and finger 0 releases, the next finger to be |
| 26 | /// pressed can be assigned to id 0. |
| 27 | uint32_t id() const { return touch_point_.id; } |
| 28 | |
| 29 | /// @return The x-y coordinates of this TouchPoint, in DOM coordinate space. |
| 30 | FloatPoint position() const { |
| 31 | return pp::FloatPoint(touch_point_.position); |
| 32 | } |
| 33 | |
| 34 | /// @return The elliptical radii, in screen pixels, in the x and y direction |
| 35 | /// of this TouchPoint. |
| 36 | FloatPoint radii() const { return pp::FloatPoint(touch_point_.radius); } |
| 37 | |
| 38 | /// @return The angle of rotation of the elliptical model of this TouchPoint |
| 39 | /// from the y-axis. |
| 40 | float rotation_angle() const { return touch_point_.rotation_angle; } |
| 41 | |
| 42 | /// @return The pressure applied to this TouchPoint. This is typically a |
| 43 | /// value between 0 and 1, with 0 indicating no pressure and 1 indicating |
| 44 | /// some maximum pressure, but scaling differs depending on the hardware and |
| 45 | /// the value is not guaranteed to stay within that range. |
| 46 | float pressure() const { return touch_point_.pressure; } |
| 47 | |
| 48 | private: |
| 49 | PP_TouchPoint touch_point_; |
| 50 | }; |
| 51 | |
| 52 | } // namespace pp |
| 53 | |
| 54 | #endif /* PPAPI_CPP_TOUCH_POINT_H_ */ |