Marching squares: Difference between revisions
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→{{header|Phix}}: decided to use -1,-1 as the failure result
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<span style="color: #008080;">if</span> <span style="color: #000000;">cx</span><span style="color: #0000FF;">=</span><span style="color: #000000;">x</span> <span style="color: #008080;">and</span> <span style="color: #000000;">cy</span><span style="color: #0000FF;">=</span><span style="color: #000000;">y</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
<span style="color: #000080;font-style:italic;">-- return 0-based indexes to match other entries</span>
<span style="color: #008080;">return</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">x</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">-(</span><span style="color: #000000;">y</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">),</span> <span style="color: #000000;">directions</span><span style="color: #0000FF;">}</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #008080;">return</span> <span style="color: #0000FF;">{-</span><span style="color: #000000;">
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
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