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
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<head>
<title>Lua-System docs</title>
<link rel="stylesheet" href="../ldoc.css" type="text/css" />
</head>
<body>
<div id="container">
<div id="product">
<div id="product_logo"></div>
<div id="product_name"><big><b></b></big></div>
<div id="product_description"></div>
</div> <!-- id="product" -->
<div id="main">
<!-- Menu -->
<div id="navigation">
<br/>
<h1>Lua-System</h1>
<ul>
<li><a href="../index.html">Index</a></li>
</ul>
<h2>Examples</h2>
<ul class="nowrap">
<li><a href="../examples/compat.lua.html">compat.lua</a></li>
<li><a href="../examples/flag_debugging.lua.html">flag_debugging.lua</a></li>
<li><a href="../examples/password_input.lua.html">password_input.lua</a></li>
<li><a href="../examples/read.lua.html">read.lua</a></li>
<li><a href="../examples/readline.lua.html">readline.lua</a></li>
<li><a href="../examples/spinner.lua.html">spinner.lua</a></li>
<li><strong>spiral_snake.lua</strong></li>
<li><a href="../examples/terminalsize.lua.html">terminalsize.lua</a></li>
</ul>
<h2>Modules</h2>
<ul class="nowrap">
<li><a href="../modules/system.html">system</a></li>
</ul>
<h2>Classes</h2>
<ul class="nowrap">
<li><a href="../classes/bitflags.html">bitflags</a></li>
</ul>
<h2>Topics</h2>
<ul class="">
<li><a href="../topics/01-introduction.md.html">1. Introduction</a></li>
<li><a href="../topics/02-development.md.html">2. Development</a></li>
<li><a href="../topics/03-terminal.md.html">3. Terminal functionality</a></li>
<li><a href="../topics/CHANGELOG.md.html">CHANGELOG</a></li>
<li><a href="../topics/LICENSE.md.html">MIT License</a></li>
</ul>
</div>
<div id="content">
<h2>spiral_snake.lua</h2>
<pre>
<span class="keyword">local</span> sys = <span class="global">require</span> <span class="string">"system"</span>
<span class="global">print</span> <span class="string">[[
This example will draw a snake like spiral on the screen. Showing ANSI escape
codes for moving the cursor around.
]]</span>
<span class="comment">-- backup term settings with auto-restore on exit
</span>sys.<span class="function-name">autotermrestore</span>()
<span class="comment">-- setup Windows console to handle ANSI processing
</span>sys.<span class="function-name">setconsoleflags</span>(<span class="global">io</span>.stdout, sys.<span class="function-name">getconsoleflags</span>(<span class="global">io</span>.stdout) + sys.COF_VIRTUAL_TERMINAL_PROCESSING)
<span class="comment">-- start drawing the spiral.
</span><span class="comment">-- start from current pos, then right, then up, then left, then down, and again.
</span><span class="keyword">local</span> x, y = <span class="number">1</span>, <span class="number">1</span> <span class="comment">-- current position
</span><span class="keyword">local</span> dx, dy = <span class="number">1</span>, <span class="number">0</span> <span class="comment">-- direction after each step
</span><span class="keyword">local</span> wx, wy = <span class="number">30</span>, <span class="number">30</span> <span class="comment">-- width and height of the room
</span><span class="keyword">local</span> mx, my = <span class="number">1</span>, <span class="number">1</span> <span class="comment">-- margin
</span>
<span class="comment">-- commands to move the cursor
</span><span class="keyword">local</span> move_left = <span class="string">"\27[1D"</span>
<span class="keyword">local</span> move_right = <span class="string">"\27[1C"</span>
<span class="keyword">local</span> move_up = <span class="string">"\27[1A"</span>
<span class="keyword">local</span> move_down = <span class="string">"\27[1B"</span>
<span class="comment">-- create room: 30 empty lines
</span><span class="global">print</span>((<span class="string">"\n"</span>):<span class="function-name">rep</span>(wy))
<span class="keyword">local</span> move = move_right
<span class="keyword">while</span> wx > <span class="number">0</span> <span class="keyword">and</span> wy > <span class="number">0</span> <span class="keyword">do</span>
sys.<span class="function-name">sleep</span>(<span class="number">0.01</span>) <span class="comment">-- slow down the drawing a little
</span> <span class="global">io</span>.<span class="function-name">write</span>(<span class="string">"*"</span> .. move_left .. move )
<span class="global">io</span>.<span class="function-name">flush</span>()
x = x + dx
y = y + dy
<span class="keyword">if</span> x > wx <span class="keyword">and</span> move == move_right <span class="keyword">then</span>
<span class="comment">-- end of move right
</span> dx = <span class="number">0</span>
dy = <span class="number">1</span>
move = move_up
wy = wy - <span class="number">1</span>
my = my + <span class="number">1</span>
<span class="keyword">elseif</span> y > wy <span class="keyword">and</span> move == move_up <span class="keyword">then</span>
<span class="comment">-- end of move up
</span> dx = -<span class="number">1</span>
dy = <span class="number">0</span>
move = move_left
wx = wx - <span class="number">1</span>
mx = mx + <span class="number">1</span>
<span class="keyword">elseif</span> x < mx <span class="keyword">and</span> move == move_left <span class="keyword">then</span>
<span class="comment">-- end of move left
</span> dx = <span class="number">0</span>
dy = -<span class="number">1</span>
move = move_down
wy = wy - <span class="number">1</span>
my = my + <span class="number">1</span>
<span class="keyword">elseif</span> y < my <span class="keyword">and</span> move == move_down <span class="keyword">then</span>
<span class="comment">-- end of move down
</span> dx = <span class="number">1</span>
dy = <span class="number">0</span>
move = move_right
wx = wx - <span class="number">1</span>
mx = mx + <span class="number">1</span>
<span class="keyword">end</span>
<span class="keyword">end</span>
<span class="global">io</span>.<span class="function-name">write</span>(move_down:<span class="function-name">rep</span>(<span class="number">15</span>))
<span class="global">print</span>(<span class="string">"\nDone!"</span>)</pre>
</div> <!-- id="content" -->
</div> <!-- id="main" -->
<div id="about">
<i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
<i style="float:right;">Last updated 2024-06-20 23:11:37 </i>
</div> <!-- id="about" -->
</div> <!-- id="container" -->
</body>
</html>
|
