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88 lines
2.4 KiB
88 lines
2.4 KiB
9 years ago
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/* Copyright (c) 2012 The Chromium Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* From pp_touch_point.idl modified Thu Mar 28 10:13:07 2013. */
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#ifndef PPAPI_C_PP_TOUCH_POINT_H_
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#define PPAPI_C_PP_TOUCH_POINT_H_
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#include "ppapi/c/pp_macros.h"
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#include "ppapi/c/pp_point.h"
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#include "ppapi/c/pp_stdint.h"
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/**
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* @file
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* This file defines the API to create a touch point or position where fingers
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* makes contact with touch screen device.
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*/
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/**
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* @addtogroup Structs
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* @{
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*/
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/**
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* The <code>PP_TouchPoint</code> struct represents all information about a
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* single touch point, such as position, id, rotation angle, and pressure.
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*/
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struct PP_TouchPoint {
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/**
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* This value represents the identifier for this TouchPoint. The id
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* corresponds to the order in which the points were pressed. For example,
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* the first point to be pressed has an id of 0, the second has an id of 1,
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* and so on. An id can be reused when a touch point is released. For
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* example, if two fingers are down, with id 0 and 1, and finger 0 releases,
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* the next finger to be pressed can be assigned to id 0.
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*/
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uint32_t id;
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/**
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* This value represents the x and y pixel position of this TouchPoint
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* relative to the upper-left of the module instance receiving the event.
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*/
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struct PP_FloatPoint position;
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/**
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* This value represents the elliptical radii, in screen pixels, in the x
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* and y direction of this TouchPoint.
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*/
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struct PP_FloatPoint radius;
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/**
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* This value represents the angle of rotation in degrees of the elliptical
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* model of this TouchPoint clockwise from "up."
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*/
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float rotation_angle;
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/**
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* This value represents the pressure applied to this TouchPoint. This value
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* is typically between 0 and 1, with 0 indicating no pressure and 1
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* indicating some maximum pressure. Scaling differs depending on the
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* hardware and the value is not guaranteed to stay within that range.
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*/
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float pressure;
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};
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PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_TouchPoint, 28);
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/**
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* @}
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*/
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/**
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* @addtogroup Functions
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* @{
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*/
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/**
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* PP_MakeTouchPoint() creates a <code>PP_TouchPoint</code>.
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*
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* @return A <code>PP_TouchPoint</code> structure.
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*/
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PP_INLINE struct PP_TouchPoint PP_MakeTouchPoint(void) {
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struct PP_TouchPoint result = { 0, {0, 0}, {0, 0}, 0, 0 };
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return result;
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}
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/**
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* @}
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*/
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#endif /* PPAPI_C_PP_TOUCH_POINT_H_ */
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