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<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#L16'>screen</a>: (addr <a href='500fake-screen.mu.html#L16'>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#L580'>pixel</a> <a href='500fake-screen.mu.html#L16'>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#L580'>pixel</a> <a href='500fake-screen.mu.html#L16'>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#L580'>pixel</a> <a href='500fake-screen.mu.html#L16'>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#L580'>pixel</a> <a href='500fake-screen.mu.html#L16'>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#L16'>screen</a>: (addr <a href='500fake-screen.mu.html#L16'>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#L16'>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#L16'>screen</a>, cx cy, r, border-color
<span id="L90" class="LineNr">90 </span><span class="Delimiter">}</span>
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