blob: b3baf96398e9dffdd9677ab04feafe02ca6c7260 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Copyright (C) 2017-2021 David Thompson davet@gnu.org
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
A copy of the license is included in the section entitled "GNU
Free Documentation License".
A copy of the license is also available from the Free Software
Foundation Web site at http://www.gnu.org/licenses/fdl.html.
* Chickadee: (chickadee). Game programming toolkit for Guile.
The document was typeset with
http://www.texinfo.org/ (GNU Texinfo).
-->
<!-- Created by GNU Texinfo 6.7, http://www.gnu.org/software/texinfo/ -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Input Devices (The Chickadee Game Toolkit)</title>
<meta name="description" content="Input Devices (The Chickadee Game Toolkit)">
<meta name="keywords" content="Input Devices (The Chickadee Game Toolkit)">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<link href="index.html" rel="start" title="Top">
<link href="Index.html" rel="index" title="Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="Kernel.html" rel="up" title="Kernel">
<link href="Window-Manipulation.html" rel="next" title="Window Manipulation">
<link href="The-Game-Loop.html" rel="prev" title="The Game Loop">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.indentedblock {margin-right: 0em}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
kbd {font-style: oblique}
pre.display {font-family: inherit}
pre.format {font-family: inherit}
pre.menu-comment {font-family: serif}
pre.menu-preformatted {font-family: serif}
span.nolinebreak {white-space: nowrap}
span.roman {font-family: initial; font-weight: normal}
span.sansserif {font-family: sans-serif; font-weight: normal}
ul.no-bullet {list-style: none}
@media (min-width: 1140px) {
body {
margin-left: 14rem;
margin-right: 4rem;
max-width: 52rem;
}
}
@media (min-width: 800px) and (max-width: 1140px) {
body {
margin-left: 6rem;
margin-right: 4rem;
max-width: 52rem;
}
}
@media (max-width: 800px) {
body {
margin: 1rem;
}
}
-->
</style>
<link rel="stylesheet" type="text/css" href="https://dthompson.us/css/dthompson.css">
</head>
<body lang="en">
<span id="Input-Devices"></span><div class="header">
<p>
Next: <a href="Window-Manipulation.html" accesskey="n" rel="next">Window Manipulation</a>, Previous: <a href="The-Game-Loop.html" accesskey="p" rel="prev">The Game Loop</a>, Up: <a href="Kernel.html" accesskey="u" rel="up">Kernel</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<span id="Input-Devices-1"></span><h4 class="subsection">5.1.2 Input Devices</h4>
<p>While <code>run-game</code> provides hooks for mouse/keyboard/controller
input events, it is often necessary to query input devices for their
current state. For example, it could be desirable to query the state
of the arrow keys every time the update hook is called to determine
which direction the player should move that frame.
</p>
<dl>
<dt id="index-key_002dpressed_003f">Procedure: <strong>key-pressed?</strong> <em>key</em></dt>
<dd><p>Return <code>#t</code> if <var>key</var> is currently being pressed.
</p></dd></dl>
<dl>
<dt id="index-key_002dreleased_003f">Procedure: <strong>key-released?</strong> <em>key</em></dt>
<dd><p>Return <code>#t</code> if <var>key</var> is <em>not</em> currently being pressed.
</p></dd></dl>
<dl>
<dt id="index-mouse_002dx">Procedure: <strong>mouse-x</strong></dt>
<dd><p>Return the current X coordinate of the mouse cursor.
</p></dd></dl>
<dl>
<dt id="index-mouse_002dy">Procedure: <strong>mouse-y</strong></dt>
<dd><p>Return the current Y coordinate of the mouse cursor.
</p></dd></dl>
<dl>
<dt id="index-mouse_002dbutton_002dpressed_003f">Procedure: <strong>mouse-button-pressed?</strong> <em>button</em></dt>
<dd><p>Return <code>#t</code> if <var>button</var> is currently being pressed.
</p></dd></dl>
<dl>
<dt id="index-mouse_002dbutton_002dreleased_003f">Procedure: <strong>mouse-button-released?</strong> <em>button</em></dt>
<dd><p>Return <code>#t</code> if <var>button</var> is <em>not</em> currently being
pressed.
</p></dd></dl>
<dl>
<dt id="index-controller_002daxis">Procedure: <strong>controller-axis</strong> <em>controller axis</em></dt>
<dd><p>Return a floating point value in the range [-1, 1] corresponding to
how much <var>axis</var> (an analog stick or trigger) is being pushed on
<var>controller</var>. 0 is returned if <var>axis</var> is not being pushed at
all.
</p></dd></dl>
<dl>
<dt id="index-controller_002dname">Procedure: <strong>controller-name</strong> <em>controller</em></dt>
<dd><p>Return the name of <var>controller</var>.
</p></dd></dl>
<dl>
<dt id="index-controller_002dbutton_002dpressed_003f">Procedure: <strong>controller-button-pressed?</strong> <em>controller button</em></dt>
<dd><p>Return <code>#t</code> if <var>button</var> on <var>controller</var> is currently
being pressed.
</p></dd></dl>
<dl>
<dt id="index-controller_002dbutton_002dreleased_003f">Procedure: <strong>controller-button-released?</strong> <em>controller button</em></dt>
<dd><p>Return <code>#t</code> if <var>button</var> on <var>controller</var> is <em>not</em>
currently being pressed.
</p></dd></dl>
</body>
</html>
|
