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
12namespace pp {
13
14/// Wrapper class for PP_TouchPoint.
15class 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_ */
55