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
|
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Mu - 508circle.mu</title>
<meta name="Generator" content="Vim/8.2">
<meta name="plugin-version" content="vim8.1_v2">
<meta name="syntax" content="none">
<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=,use_input_for_pc=fallback">
<meta name="colorscheme" content="minimal-light">
<style>
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #ffffd7; }
body { font-size:12pt; font-family: monospace; color: #000000; background-color: #ffffd7; }
a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
.PreProc { color: #c000c0; }
.muRegEcx { color: #870000; }
.muRegEdx { color: #af5f00; }
.LineNr { }
.Constant { color: #008787; }
.muFunction { color: #af5f00; text-decoration: underline; }
.Delimiter { color: #c000c0; }
.muComment { color: #005faf; }
.Special { color: #ff6060; }
-->
</style>
<script>
<!--
/* function to open any folds containing a jumped-to line before jumping to it */
function JumpToLine()
{
var lineNum;
lineNum = window.location.hash;
lineNum = lineNum.substr(1); /* strip off '#' */
if (lineNum.indexOf('L') == -1) {
lineNum = 'L'+lineNum;
}
var lineElem = document.getElementById(lineNum);
/* Always jump to new location even if the line was hidden inside a fold, or
* we corrected the raw number to a line ID.
*/
if (lineElem) {
lineElem.scrollIntoView(true);
}
return true;
}
if ('onhashchange' in window) {
window.onhashchange = JumpToLine;
}
-->
</script>
</head>
<body onload='JumpToLine();'>
<a href='https://github.com/akkartik/mu/blob/main/508circle.mu'>https://github.com/akkartik/mu/blob/main/508circle.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='508circle.mu.html#L1'>draw-circle</a></span> <a href='500fake-screen.mu.html#L14'>screen</a>: (addr <a href='500fake-screen.mu.html#L14'>screen</a>), cx: int, cy: int, radius: int, color: int <span class="Delimiter">{</span>
<span id="L2" class="LineNr"> 2 </span> <span class="PreProc">var</span> x: int
<span id="L3" class="LineNr"> 3 </span> <span class="PreProc">var</span> y: int
<span id="L4" class="LineNr"> 4 </span> <span class="PreProc">var</span> err: int
<span id="L5" class="LineNr"> 5 </span> <span class="muComment"># x = -r</span>
<span id="L6" class="LineNr"> 6 </span> <span class="PreProc">var</span> tmp/eax: int <span class="Special"><-</span> copy radius
<span id="L7" class="LineNr"> 7 </span> tmp <span class="Special"><-</span> negate
<span id="L8" class="LineNr"> 8 </span> copy-to x, tmp
<span id="L9" class="LineNr"> 9 </span> <span class="muComment"># err = 2 - 2*r</span>
<span id="L10" class="LineNr">10 </span> tmp <span class="Special"><-</span> copy radius
<span id="L11" class="LineNr">11 </span> tmp <span class="Special"><-</span> shift-left <span class="Constant">1</span>
<span id="L12" class="LineNr">12 </span> tmp <span class="Special"><-</span> negate
<span id="L13" class="LineNr">13 </span> tmp <span class="Special"><-</span> add <span class="Constant">2</span>
<span id="L14" class="LineNr">14 </span> copy-to err, tmp
<span id="L15" class="LineNr">15 </span> <span class="muComment">#</span>
<span id="L16" class="LineNr">16 </span> <span class="PreProc">var</span> tmpx/<span class="muRegEcx">ecx</span>: int <span class="Special"><-</span> copy <span class="Constant">0</span>
<span id="L17" class="LineNr">17 </span> <span class="PreProc">var</span> tmpy/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> copy <span class="Constant">0</span>
<span id="L18" class="LineNr">18 </span> <span class="Delimiter">{</span>
<span id="L19" class="LineNr">19 </span> <span class="muComment"># pixel(cx-x, cy+y)</span>
<span id="L20" class="LineNr">20 </span> tmpx <span class="Special"><-</span> copy cx
<span id="L21" class="LineNr">21 </span> tmpx <span class="Special"><-</span> subtract x
<span id="L22" class="LineNr">22 </span> tmpy <span class="Special"><-</span> copy cy
<span id="L23" class="LineNr">23 </span> tmpy <span class="Special"><-</span> add y
<span id="L24" class="LineNr">24 </span> <a href='500fake-screen.mu.html#L483'>pixel</a> <a href='500fake-screen.mu.html#L14'>screen</a>, tmpx, tmpy, color
<span id="L25" class="LineNr">25 </span> <span class="muComment"># pixel(cx-y, cy-x)</span>
<span id="L26" class="LineNr">26 </span> tmpx <span class="Special"><-</span> copy cx
<span id="L27" class="LineNr">27 </span> tmpx <span class="Special"><-</span> subtract y
<span id="L28" class="LineNr">28 </span> tmpy <span class="Special"><-</span> copy cy
<span id="L29" class="LineNr">29 </span> tmpy <span class="Special"><-</span> subtract x
<span id="L30" class="LineNr">30 </span> <a href='500fake-screen.mu.html#L483'>pixel</a> <a href='500fake-screen.mu.html#L14'>screen</a>, tmpx, tmpy, color
<span id="L31" class="LineNr">31 </span> <span class="muComment"># pixel(cx+x, cy-y)</span>
<span id="L32" class="LineNr">32 </span> tmpx <span class="Special"><-</span> copy cx
<span id="L33" class="LineNr">33 </span> tmpx <span class="Special"><-</span> add x
<span id="L34" class="LineNr">34 </span> tmpy <span class="Special"><-</span> copy cy
<span id="L35" class="LineNr">35 </span> tmpy <span class="Special"><-</span> subtract y
<span id="L36" class="LineNr">36 </span> <a href='500fake-screen.mu.html#L483'>pixel</a> <a href='500fake-screen.mu.html#L14'>screen</a>, tmpx, tmpy, color
<span id="L37" class="LineNr">37 </span> <span class="muComment"># pixel(cx+y, cy+x)</span>
<span id="L38" class="LineNr">38 </span> tmpx <span class="Special"><-</span> copy cx
<span id="L39" class="LineNr">39 </span> tmpx <span class="Special"><-</span> add y
<span id="L40" class="LineNr">40 </span> tmpy <span class="Special"><-</span> copy cy
<span id="L41" class="LineNr">41 </span> tmpy <span class="Special"><-</span> add x
<span id="L42" class="LineNr">42 </span> <a href='500fake-screen.mu.html#L483'>pixel</a> <a href='500fake-screen.mu.html#L14'>screen</a>, tmpx, tmpy, color
<span id="L43" class="LineNr">43 </span> <span class="muComment"># r = err</span>
<span id="L44" class="LineNr">44 </span> tmp <span class="Special"><-</span> copy err
<span id="L45" class="LineNr">45 </span> copy-to radius, tmp
<span id="L46" class="LineNr">46 </span> <span class="muComment"># if (r <= y) { ++y; err += (y*2 + 1); }</span>
<span id="L47" class="LineNr">47 </span> <span class="Delimiter">{</span>
<span id="L48" class="LineNr">48 </span> tmpy <span class="Special"><-</span> copy y
<span id="L49" class="LineNr">49 </span> compare radius, tmpy
<span id="L50" class="LineNr">50 </span> <span class="PreProc">break-if-></span>
<span id="L51" class="LineNr">51 </span> increment y
<span id="L52" class="LineNr">52 </span> tmpy <span class="Special"><-</span> copy y
<span id="L53" class="LineNr">53 </span> tmpy <span class="Special"><-</span> shift-left <span class="Constant">1</span>
<span id="L54" class="LineNr">54 </span> tmpy <span class="Special"><-</span> increment
<span id="L55" class="LineNr">55 </span> add-to err, tmpy
<span id="L56" class="LineNr">56 </span> <span class="Delimiter">}</span>
<span id="L57" class="LineNr">57 </span> <span class="muComment"># if (r > x || err > y) { ++x; err += (x*2 + 1); }</span>
<span id="L58" class="LineNr">58 </span> $draw-circle:second-check: <span class="Delimiter">{</span>
<span id="L59" class="LineNr">59 </span> <span class="Delimiter">{</span>
<span id="L60" class="LineNr">60 </span> tmpx <span class="Special"><-</span> copy x
<span id="L61" class="LineNr">61 </span> compare radius, tmpx
<span id="L62" class="LineNr">62 </span> <span class="PreProc">break-if-></span>
<span id="L63" class="LineNr">63 </span> tmpy <span class="Special"><-</span> copy y
<span id="L64" class="LineNr">64 </span> compare err, tmpy
<span id="L65" class="LineNr">65 </span> <span class="PreProc">break-if-></span>
<span id="L66" class="LineNr">66 </span> <span class="PreProc">break</span> $draw-circle:second-check
<span id="L67" class="LineNr">67 </span> <span class="Delimiter">}</span>
<span id="L68" class="LineNr">68 </span> increment x
<span id="L69" class="LineNr">69 </span> tmpx <span class="Special"><-</span> copy x
<span id="L70" class="LineNr">70 </span> tmpx <span class="Special"><-</span> shift-left <span class="Constant">1</span>
<span id="L71" class="LineNr">71 </span> tmpx <span class="Special"><-</span> increment
<span id="L72" class="LineNr">72 </span> add-to err, tmpx
<span id="L73" class="LineNr">73 </span> <span class="Delimiter">}</span>
<span id="L74" class="LineNr">74 </span> <span class="muComment"># loop termination condition</span>
<span id="L75" class="LineNr">75 </span> compare x, <span class="Constant">0</span>
<span id="L76" class="LineNr">76 </span> <span class="PreProc">loop-if-<</span>
<span id="L77" class="LineNr">77 </span> <span class="Delimiter">}</span>
<span id="L78" class="LineNr">78 </span><span class="Delimiter">}</span>
<span id="L79" class="LineNr">79 </span>
<span id="L80" class="LineNr">80 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='508circle.mu.html#L80'>draw-disc</a></span> <a href='500fake-screen.mu.html#L14'>screen</a>: (addr <a href='500fake-screen.mu.html#L14'>screen</a>), cx: int, cy: int, radius: int, color: int, border-color: int <span class="Delimiter">{</span>
<span id="L81" class="LineNr">81 </span> <span class="PreProc">var</span> r/eax: int <span class="Special"><-</span> copy <span class="Constant">0</span>
<span id="L82" class="LineNr">82 </span> <span class="Delimiter">{</span>
<span id="L83" class="LineNr">83 </span> compare r, radius
<span id="L84" class="LineNr">84 </span> <span class="PreProc">break-if->=</span>
<span id="L85" class="LineNr">85 </span> <a href='508circle.mu.html#L1'>draw-circle</a> <a href='500fake-screen.mu.html#L14'>screen</a>, cx cy, r, color
<span id="L86" class="LineNr">86 </span> r <span class="Special"><-</span> increment
<span id="L87" class="LineNr">87 </span> <span class="PreProc">loop</span>
<span id="L88" class="LineNr">88 </span> <span class="Delimiter">}</span>
<span id="L89" class="LineNr">89 </span> <a href='508circle.mu.html#L1'>draw-circle</a> <a href='500fake-screen.mu.html#L14'>screen</a>, cx cy, r, border-color
<span id="L90" class="LineNr">90 </span><span class="Delimiter">}</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|