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<title>highlight.tig</title>
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<span style="color:#898887">/* Mandelbrot integer demo</span>
<span style="color:#898887"> * Released under the MIT License</span>
<span style="color:#898887"> */</span>
<span style="font-weight:bold">let</span>
<span style="color:#898887">/* Basic types. */</span>
<span style="font-weight:bold">type</span> bool <span style="color:#ca60ca">=</span> <span style="color:#0057ae">int</span>
<span style="font-weight:bold">type</span> coord <span style="color:#ca60ca">=</span> <span style="color:#0057ae">int</span>
<span style="font-weight:bold">type</span> value <span style="color:#ca60ca">=</span> <span style="color:#0057ae">int</span>
<span style="font-weight:bold">type</span> array2d <span style="color:#ca60ca">=</span> <span style="font-weight:bold">array</span> <span style="font-weight:bold">of</span> value
<span style="font-weight:bold">type</span> image2d <span style="color:#ca60ca">=</span> { nrows <span style="color:#ca60ca">:</span> coord<span style="color:#ca60ca">,</span> ncols <span style="color:#ca60ca">:</span> coord<span style="color:#ca60ca">,</span> data <span style="color:#ca60ca">:</span> array2d }
<span style="color:#898887">/* Image creation. */</span>
<span style="font-weight:bold">function</span> image_new (ncols <span style="color:#ca60ca">:</span> coord<span style="color:#ca60ca">,</span> nrows <span style="color:#ca60ca">:</span> coord) <span style="color:#ca60ca">:</span> image2d <span style="color:#ca60ca">=</span>
image2d { nrows <span style="color:#ca60ca">=</span> nrows<span style="color:#ca60ca">,</span> ncols <span style="color:#ca60ca">=</span> ncols<span style="color:#ca60ca">,</span>
data <span style="color:#ca60ca">=</span> array2d[nrows <span style="color:#ca60ca">*</span> ncols] <span style="font-weight:bold">of</span> <span style="color:#b08000">0</span> }
<span style="font-weight:bold">function</span> image_set (input <span style="color:#ca60ca">:</span> image2d<span style="color:#ca60ca">,</span> col <span style="color:#ca60ca">:</span> coord<span style="color:#ca60ca">,</span> row <span style="color:#ca60ca">:</span> coord<span style="color:#ca60ca">,</span>
value <span style="color:#ca60ca">:</span> value) <span style="color:#ca60ca">=</span>
(
input<span style="color:#ca60ca">.</span>data[row <span style="color:#ca60ca">*</span> input<span style="color:#ca60ca">.</span>ncols <span style="color:#ca60ca">+</span> col] <span style="color:#ca60ca">:=</span> value
)
<span style="font-weight:bold">function</span> mandelbrot () <span style="color:#ca60ca">=</span>
<span style="font-weight:bold">let</span>
<span style="font-weight:bold">type</span> fp <span style="color:#ca60ca">=</span> <span style="color:#0057ae">int</span>
<span style="font-weight:bold">var</span> X <span style="color:#ca60ca">:</span> <span style="color:#0057ae">int</span> <span style="color:#ca60ca">:=</span> <span style="color:#b08000">300</span>
<span style="font-weight:bold">var</span> Y <span style="color:#ca60ca">:</span> <span style="color:#0057ae">int</span> <span style="color:#ca60ca">:=</span> <span style="color:#b08000">300</span>
<span style="font-weight:bold">var</span> ima <span style="color:#ca60ca">:</span> image2d <span style="color:#ca60ca">:=</span> image_new (X<span style="color:#ca60ca">,</span> Y)
<span style="font-weight:bold">var</span> fixsize<span style="color:#ca60ca">:</span> <span style="color:#0057ae">int</span> <span style="color:#ca60ca">:=</span> <span style="color:#b08000">16834</span>
<span style="font-weight:bold">function</span> mul(a <span style="color:#ca60ca">:</span> fp<span style="color:#ca60ca">,</span> b <span style="color:#ca60ca">:</span> fp) <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">=</span> (a<span style="color:#ca60ca">*</span>b)<span style="color:#ca60ca">/</span>fixsize
<span style="font-weight:bold">function</span> frac(n <span style="color:#ca60ca">:</span> <span style="color:#0057ae">int</span><span style="color:#ca60ca">,</span> d <span style="color:#ca60ca">:</span> <span style="color:#0057ae">int</span>) <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">=</span> (n<span style="color:#ca60ca">*</span>fixsize)<span style="color:#ca60ca">/</span>d
<span style="font-weight:bold">var</span> xcenter <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> frac(<span style="color:#b08000">0016</span><span style="color:#ca60ca">,</span> <span style="color:#b08000">10000</span>)
<span style="font-weight:bold">var</span> ycenter <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> frac(<span style="color:#b08000">8224</span><span style="color:#ca60ca">,</span> <span style="color:#b08000">10000</span>)
<span style="font-weight:bold">var</span> xmin <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> xcenter <span style="color:#ca60ca">-</span> frac(<span style="color:#b08000">5</span><span style="color:#ca60ca">,</span><span style="color:#b08000">100</span>)
<span style="font-weight:bold">var</span> ymin <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> ycenter <span style="color:#ca60ca">-</span> frac(<span style="color:#b08000">5</span><span style="color:#ca60ca">,</span><span style="color:#b08000">100</span>)
<span style="font-weight:bold">var</span> xmax <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> xcenter <span style="color:#ca60ca">+</span> frac(<span style="color:#b08000">5</span><span style="color:#ca60ca">,</span><span style="color:#b08000">100</span>)
<span style="font-weight:bold">var</span> ymax <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> ycenter <span style="color:#ca60ca">+</span> frac(<span style="color:#b08000">5</span><span style="color:#ca60ca">,</span><span style="color:#b08000">100</span>)
<span style="font-weight:bold">var</span> xs <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> (xmax <span style="color:#ca60ca">-</span> xmin)<span style="color:#ca60ca">/</span>X
<span style="font-weight:bold">var</span> ys <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> (ymax <span style="color:#ca60ca">-</span> ymin)<span style="color:#ca60ca">/</span>Y
<span style="font-weight:bold">function</span> iterations(x<span style="color:#ca60ca">:</span><span style="color:#0057ae">int</span><span style="color:#ca60ca">,</span> y<span style="color:#ca60ca">:</span><span style="color:#0057ae">int</span>) <span style="color:#ca60ca">:</span> <span style="color:#0057ae">int</span> <span style="color:#ca60ca">=</span>
<span style="font-weight:bold">let</span>
<span style="font-weight:bold">var</span> i <span style="color:#ca60ca">:</span> <span style="color:#0057ae">int</span> <span style="color:#ca60ca">:=</span> <span style="color:#b08000">0</span>
<span style="font-weight:bold">var</span> p <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> xmin<span style="color:#ca60ca">+</span>x<span style="color:#ca60ca">*</span>xs
<span style="font-weight:bold">var</span> q <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> ymin<span style="color:#ca60ca">+</span>y<span style="color:#ca60ca">*</span>ys
<span style="font-weight:bold">var</span> x0 <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> <span style="color:#b08000">0</span>
<span style="font-weight:bold">var</span> y0 <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> <span style="color:#b08000">0</span>
<span style="font-weight:bold">var</span> xn <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> <span style="color:#b08000">0</span>
<span style="font-weight:bold">var</span> four <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> frac(<span style="color:#b08000">4</span><span style="color:#ca60ca">,</span><span style="color:#b08000">1</span>)
<span style="font-weight:bold">var</span> two <span style="color:#ca60ca">:</span> fp <span style="color:#ca60ca">:=</span> frac(<span style="color:#b08000">2</span><span style="color:#ca60ca">,</span><span style="color:#b08000">1</span>)
<span style="font-weight:bold">in</span>
<span style="font-weight:bold">while</span> (mul(xn<span style="color:#ca60ca">,</span>xn)<span style="color:#ca60ca">+</span>mul(y0<span style="color:#ca60ca">,</span>y0) <span style="color:#ca60ca"><</span> four) <span style="color:#ca60ca">&</span> (i <span style="color:#ca60ca"><</span> <span style="color:#b08000">256</span>) <span style="font-weight:bold">do</span>
(
i <span style="color:#ca60ca">:=</span> i <span style="color:#ca60ca">+</span> <span style="color:#b08000">1</span><span style="color:#ca60ca">;</span>
xn <span style="color:#ca60ca">:=</span> mul((x0<span style="color:#ca60ca">+</span>y0)<span style="color:#ca60ca">,</span>(x0<span style="color:#ca60ca">-</span>y0)) <span style="color:#ca60ca">+</span> p<span style="color:#ca60ca">;</span>
y0 <span style="color:#ca60ca">:=</span> mul(two<span style="color:#ca60ca">,</span>mul(x0<span style="color:#ca60ca">,</span>y0)) <span style="color:#ca60ca">+</span> q<span style="color:#ca60ca">;</span>
x0 <span style="color:#ca60ca">:=</span> xn
)<span style="color:#ca60ca">;</span>
i
<span style="font-weight:bold">end</span>
<span style="font-weight:bold">in</span>
(<span style="font-weight:bold">for</span> y <span style="color:#ca60ca">:=</span> <span style="color:#b08000">0</span> <span style="font-weight:bold">to</span> (Y<span style="color:#ca60ca">-</span><span style="color:#b08000">1</span>) <span style="font-weight:bold">do</span>
<span style="font-weight:bold">for</span> x <span style="color:#ca60ca">:=</span> <span style="color:#b08000">0</span> <span style="font-weight:bold">to</span> (X<span style="color:#ca60ca">-</span><span style="color:#b08000">1</span>) <span style="font-weight:bold">do</span>
<span style="font-weight:bold">let</span>
<span style="font-weight:bold">var</span> i <span style="color:#ca60ca">:</span> <span style="color:#0057ae">int</span> <span style="color:#ca60ca">:=</span> iterations(x<span style="color:#ca60ca">,</span>y)
<span style="font-weight:bold">in</span>
image_set (ima<span style="color:#ca60ca">,</span> x<span style="color:#ca60ca">,</span> y<span style="color:#ca60ca">,</span> i)
<span style="font-weight:bold">end</span>)<span style="color:#ca60ca">;</span>
<span style="font-weight:bold">end</span>
<span style="font-weight:bold">in</span>
<span style="color:#644a9b">print</span>(<span style="color:#bf0303">"Mandelbrot demo</span><span style="color:#3daee9">\n</span><span style="color:#bf0303">"</span>)<span style="color:#ca60ca">;</span>
mandelbrot()
<span style="font-weight:bold">end</span>
</pre></body></html>
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