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 <stdint.h> 9 10 #include "ppapi/c/ppb_input_event.h" 11 #include "ppapi/cpp/input_event.h" 12 #include "ppapi/cpp/point.h" 13 14 namespace pp { 15 16 /// Wrapper class for PP_TouchPoint. 17 class TouchPoint { 18 public: TouchPoint()19 TouchPoint() : touch_point_(PP_MakeTouchPoint()) {} 20 TouchPoint(const PP_TouchPoint & point)21 TouchPoint(const PP_TouchPoint& point) 22 : touch_point_(point), tilt_(PP_MakeFloatPoint(0, 0)) {} 23 TouchPoint(const PP_TouchPoint & point,const PP_FloatPoint & tilt)24 TouchPoint(const PP_TouchPoint& point, const PP_FloatPoint& tilt) 25 : touch_point_(point), tilt_(tilt) {} 26 27 /// @return The identifier for this TouchPoint. This corresponds to the order 28 /// in which the points were pressed. For example, the first point to be 29 /// pressed has an id of 0, the second has an id of 1, and so on. An id can be 30 /// reused when a touch point is released. For example, if two fingers are 31 /// down, with id 0 and 1, and finger 0 releases, the next finger to be 32 /// pressed can be assigned to id 0. id()33 uint32_t id() const { return touch_point_.id; } 34 35 /// @return The x-y coordinates of this TouchPoint, in DOM coordinate space. position()36 FloatPoint position() const { 37 return pp::FloatPoint(touch_point_.position); 38 } 39 40 /// @return The elliptical radii, in screen pixels, in the x and y direction 41 /// of this TouchPoint. radii()42 FloatPoint radii() const { return pp::FloatPoint(touch_point_.radius); } 43 44 /// @return The angle of rotation of the elliptical model of this TouchPoint 45 /// from the y-axis. rotation_angle()46 float rotation_angle() const { return touch_point_.rotation_angle; } 47 48 /// @return The pressure applied to this TouchPoint. This is typically a 49 /// value between 0 and 1, with 0 indicating no pressure and 1 indicating 50 /// some maximum pressure, but scaling differs depending on the hardware and 51 /// the value is not guaranteed to stay within that range. pressure()52 float pressure() const { return touch_point_.pressure; } 53 54 /// @return The tilt of this touchpoint. This is a float point. Values of x 55 /// and y are between 0 and 90, with 0 indicating 0 degrees and 90 indicating 56 // 90 degrees. tilt()57 PP_FloatPoint tilt() const { return tilt_; } 58 59 private: 60 PP_TouchPoint touch_point_; 61 PP_FloatPoint tilt_; 62 }; 63 64 } // namespace pp 65 66 #endif /* PPAPI_CPP_TOUCH_POINT_H_ */ 67