Catmull–Clark subdivision surface: Difference between revisions
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=={{header|Phix}}==
{{trans|Go}}
<!--<lang Phix>(phixonline)-->
<span style="color: #000080;font-style:italic;">-- demo\rosetta\Catmull_Clark_subdivision_surface.exw</span>
<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">newPoint</span><span style="color: #0000FF;">()</span> <span style="color: #008080;">return</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">0</span><span style="color: #0000FF;">}</span> <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
<span style="color: #008080;">function</span> <span style="color: #000000;">newPointEx</span><span style="color: #0000FF;">()</span> <span style="color: #008080;">return</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">newPoint</span><span style="color: #0000FF;">(),</span><span style="color: #000000;">0</span><span style="color: #0000FF;">}</span> <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
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<span style="color: #004080;">sequence</span> <span style="color: #000000;">mergedEdges</span> <span style="color: #0000FF;">={}</span>
<span style="color: #008080;">while</span> <span style="color: #000000;">eIndex</span><span style="color: #0000FF;"><=</span><span style="color: #000000;">numEdges</span> <span style="color: #008080;">do</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">e1</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">deep_copy</span><span style="color: #0000FF;">(</span><span style="color: #000000;">edges</span><span style="color: #0000FF;">[</span><span style="color: #000000;">eIndex</span><span style="color: #0000FF;">])</span>
<span style="color: #004080;">integer</span> <span style="color: #000000;">e4</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">-</span><span style="color: #000000;">1</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">eIndex</span><span style="color: #0000FF;"><=</span><span style="color: #000000;">numEdges</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span>
<span style="color: #008080;">and</span> <span style="color: #000000;">e1</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..</span><span style="color: #000000;">2</span><span style="color: #0000FF;">]==</span><span style="color: #000000;">edges</span><span style="color: #0000FF;">[</span><span style="color: #000000;">eIndex</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">][</span><span style="color: #000000;">1</span><span style="color: #0000FF;">..</span><span style="color: #000000;">2</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">then</span>
<span style="color: #000000;">e4</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">deep_copy</span><span style="color: #0000FF;">(</span><span style="color: #000000;">edges</span><span style="color: #0000FF;">[</span><span style="color: #000000;">eIndex</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">][</span><span style="color: #000000;">3</span><span style="color: #0000FF;">])</span>
<span style="color: #000000;">eIndex</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #000000;">
<span style="color: #000000;">mergedEdges</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">mergedEdges</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">e1</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">eIndex</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">edgesCenters</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{}</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">mergedEdges</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
<span style="color: #004080;">sequence</span> <span style="color: #000000;">me</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">deep_copy</span><span style="color: #0000FF;">(</span><span style="color: #000000;">mergedEdges</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]),</span>
<span style="color: #000000;">cp</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">centerPoint</span><span style="color: #0000FF;">(</span><span style="color: #000000;">inputPoints</span><span style="color: #0000FF;">[</span><span style="color: #000000;">me</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]],</span>
<span style="color: #000000;">inputPoints</span><span style="color: #0000FF;">[</span><span style="color: #000000;">me</span><span style="color: #0000FF;">[</span><span style="color: #000000;">2</span><span style="color: #0000FF;">]])</span>
<span style="color: #000000;">
<span style="color: #000000;">edgesCenters</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">edgesCenters</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">me</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">edgesCenters</span>
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