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1 /* Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
2 * Use of this source code is governed by a BSD-style license that can be | |
3 * found in the LICENSE file. | |
4 */ | |
5 | |
6 | |
7 /** | |
8 * This file defines the API to create a touch-point. | |
brettw
2012/06/21 21:09:32
This file should be called pp_touch_point.idl inst
sadrul
2012/06/21 21:25:12
Done.
| |
9 */ | |
10 | |
11 /** | |
12 * The <code>PP_TouchPoint</code> represents all information about a single | |
13 * touch point, such ase position, id, rotation angle, and pressure. | |
14 */ | |
15 [assert_size(28), returnByValue] | |
16 struct PP_TouchPoint { | |
17 /** | |
18 * The identifier for this TouchPoint. This corresponds to the order | |
19 * in which the points were pressed. For example, the first point to be | |
20 * pressed has an id of 0, the second has an id of 1, and so on. An id can be | |
21 * reused when a touch point is released. For example, if two fingers are | |
22 * down, with id 0 and 1, and finger 0 releases, the next finger to be | |
23 * pressed can be assigned to id 0. | |
24 */ | |
25 uint32_t id; | |
26 | |
27 /** | |
28 * The x-y pixel position of this TouchPoint, relative to the upper-left of | |
29 * the instance receiving the event. | |
30 */ | |
31 PP_FloatPoint position; | |
32 | |
33 /** | |
34 * The elliptical radii, in screen pixels, in the x and y direction of this | |
35 * TouchPoint. | |
36 */ | |
37 PP_FloatPoint radius; | |
38 | |
39 /** | |
40 * The angle of rotation in degrees of the elliptical model of this TouchPoint | |
41 * clockwise from "up." | |
42 */ | |
43 float_t rotation_angle; | |
44 | |
45 /** | |
46 * The pressure applied to this TouchPoint. This is typically a | |
47 * value between 0 and 1, with 0 indicating no pressure and 1 indicating | |
48 * some maximum pressure, but scaling differs depending on the hardware and | |
49 * the value is not guaranteed to stay within that range. | |
50 */ | |
51 float_t pressure; | |
52 }; | |
53 | |
54 #inline c | |
55 /** | |
56 * @addtogroup Functions | |
57 * @{ | |
58 */ | |
59 | |
60 /** | |
61 * PP_MakeTouchPoint() creates a <code>PP_TouchPoint</code>. | |
62 * | |
63 * @return A <code>PP_TouchPoint</code> structure. | |
64 */ | |
65 PP_INLINE struct PP_TouchPoint PP_MakeTouchPoint() { | |
66 struct PP_TouchPoint result = { 0, {0, 0}, {0, 0}, 0, 0 }; | |
67 return result; | |
68 } | |
69 /** | |
70 * @} | |
71 */ | |
72 | |
73 #endinl | |
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