/* 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.
 */


/**
 * This file defines the API to create a touch-point.
 */

/**
 * The <code>PP_TouchPoint</code> represents all information about a single
 * touch point, such ase position, id, rotation angle, and pressure.
 */
[assert_size(28), returnByValue]
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.
   */
  PP_FloatPoint position;

  /**
   * The elliptical radii, in screen pixels, in the x and y direction of this
   * TouchPoint.
   */
  PP_FloatPoint radius;

  /**
   * The angle of rotation in degrees of the elliptical model of this TouchPoint
   * clockwise from "up."
   */
  float_t 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_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() {
  struct PP_TouchPoint result = { 0, {0, 0}, {0, 0}, 0, 0 };
  return result;
}
/**
 * @}
 */

#endinl