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/* 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.
*/
/* From pp_touch_point.idl modified Thu Jun 21 16:46:17 2012. */
#ifndef PPAPI_C_PP_TOUCH_POINT_H_
#define PPAPI_C_PP_TOUCH_POINT_H_
#include "ppapi/c/pp_macros.h"
#include "ppapi/c/pp_point.h"
#include "ppapi/c/pp_stdint.h"
/**
* @file
* This file defines the API to create a touch-point.
*/
/**
* @addtogroup Structs
* @{
*/
/**
* The <code>PP_TouchPoint</code> represents all information about a single
* touch point, such ase position, id, rotation angle, and pressure.
*/
struct PP_TouchPoint {
/**
* 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;
/**
* The x-y pixel position of this TouchPoint, relative to the upper-left of
* the instance receiving the event.
*/
struct PP_FloatPoint position;
/**
* The elliptical radii, in screen pixels, in the x and y direction of this
* TouchPoint.
*/
struct PP_FloatPoint radius;
/**
* The angle of rotation in degrees of the elliptical model of this TouchPoint
* clockwise from "up."
*/
float rotation_angle;
/**
* 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;
};
PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_TouchPoint, 28);
/**
* @}
*/
/**
* @addtogroup Functions
* @{
*/
/**
* PP_MakeTouchPoint() creates a <code>PP_TouchPoint</code>.
*
* @return A <code>PP_TouchPoint</code> structure.
*/
PP_INLINE struct PP_TouchPoint PP_MakeTouchPoint() {
struct PP_TouchPoint result = { 0, {0, 0}, {0, 0}, 0, 0 };
return result;
}
/**
* @}
*/
#endif /* PPAPI_C_PP_TOUCH_POINT_H_ */
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