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Diffstat (limited to 'ppapi/cpp/touch_point.h')
-rw-r--r-- | ppapi/cpp/touch_point.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/ppapi/cpp/touch_point.h b/ppapi/cpp/touch_point.h new file mode 100644 index 0000000..0868061 --- /dev/null +++ b/ppapi/cpp/touch_point.h @@ -0,0 +1,54 @@ +// Copyright (c) 2012 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#ifndef PPAPI_CPP_TOUCH_POINT_H_ +#define PPAPI_CPP_TOUCH_POINT_H_ + +#include "ppapi/c/ppb_input_event.h" +#include "ppapi/cpp/input_event.h" +#include "ppapi/cpp/point.h" + +namespace pp { + +/// Wrapper class for PP_TouchPoint. +class TouchPoint { + public: + TouchPoint() : touch_point_(PP_MakeTouchPoint()) {} + + TouchPoint(const PP_TouchPoint& point) : touch_point_(point) {} + + /// @return The identifier for this TouchPoint. This corresponds to the order + /// in which the points were pressed. For example, the first point to be + /// pressed has an id of 0, the second has an id of 1, and so on. An id can be + /// reused when a touch point is released. For example, if two fingers are + /// down, with id 0 and 1, and finger 0 releases, the next finger to be + /// pressed can be assigned to id 0. + uint32_t id() const { return touch_point_.id; } + + /// @return The x-y coordinates of this TouchPoint, in DOM coordinate space. + FloatPoint position() const { + return pp::FloatPoint(touch_point_.position); + } + + /// @return The elliptical radii, in screen pixels, in the x and y direction + /// of this TouchPoint. + FloatPoint radii() const { return pp::FloatPoint(touch_point_.radius); } + + /// @return The angle of rotation of the elliptical model of this TouchPoint + /// from the y-axis. + float rotation_angle() const { return touch_point_.rotation_angle; } + + /// @return The pressure applied to this TouchPoint. This is typically a + /// value between 0 and 1, with 0 indicating no pressure and 1 indicating + /// some maximum pressure, but scaling differs depending on the hardware and + /// the value is not guaranteed to stay within that range. + float pressure() const { return touch_point_.pressure; } + + private: + PP_TouchPoint touch_point_; +}; + +} // namespace pp + +#endif /* PPAPI_CPP_TOUCH_POINT_H_ */ |