/* Copyright 2012 The Chromium Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/**
* This file defines the API to create a touch point or position where fingers
* makes contact with touch screen device.
*/
/**
* The <code>PP_TouchPoint</code> struct represents all information about a
* single touch point, such as position, id, rotation angle, and pressure.
*/
[assert_size(28), returnByValue]
struct PP_TouchPoint {
/**
* This value represents the identifier for this TouchPoint. The id
* 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;
/**
* This value represents the x and y pixel position of this TouchPoint
* relative to the upper-left of the module instance receiving the event.
*/
PP_FloatPoint position;
/**
* This value represents the elliptical radii, in screen pixels, in the x
* and y direction of this TouchPoint.
*/
PP_FloatPoint radius;
/**
* This value represents the angle of rotation in degrees of the elliptical
* model of this TouchPoint clockwise from "up."
*/
float_t rotation_angle;
/**
* This value represents the pressure applied to this TouchPoint. This value
* is typically between 0 and 1, with 0 indicating no pressure and 1
* indicating some maximum pressure. Scaling differs depending on the
* hardware and the value is not guaranteed to stay within that range.
*/
float_t pressure;
};
#inline c
/**
* @addtogroup Functions
* @{
*/
/**
* PP_MakeTouchPoint() creates a <code>PP_TouchPoint</code>.
*
* @return A <code>PP_TouchPoint</code> structure.
*/
PP_INLINE struct PP_TouchPoint PP_MakeTouchPoint(void) {
struct PP_TouchPoint result = { 0, {0, 0}, {0, 0}, 0, 0 };
return result;
}
/**
* @}
*/
#endinl
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