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_ */ 55
