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Collinearity problem dealt with, some unit tests written.

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Simon Brooke 2020-05-24 22:02:39 +01:00
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<link rel="stylesheet" href="../coverage.css"/> <title> walkmap/path.clj </title>
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<span class="covered" title="1 out of 1 forms covered">
001&nbsp;&nbsp;(ns&nbsp;walkmap.path
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002&nbsp;&nbsp;&nbsp;&nbsp;&quot;Essentially&nbsp;the&nbsp;specification&nbsp;for&nbsp;things&nbsp;we&nbsp;shall&nbsp;consider&nbsp;to&nbsp;be&nbsp;path.&quot;
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003&nbsp;&nbsp;&nbsp;&nbsp;(:require&nbsp;[walkmap.polygon&nbsp;:refer&nbsp;[polygon?]]
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004&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[walkmap.vertex&nbsp;:refer&nbsp;[vertex?]]))
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005&nbsp;&nbsp;
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006&nbsp;&nbsp;(defn&nbsp;path?
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007&nbsp;&nbsp;&nbsp;&nbsp;&quot;True&nbsp;if&nbsp;`o`&nbsp;satisfies&nbsp;the&nbsp;conditions&nbsp;for&nbsp;a&nbsp;path.&nbsp;A&nbsp;path&nbsp;shall&nbsp;be&nbsp;a&nbsp;map
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008&nbsp;&nbsp;&nbsp;&nbsp;having&nbsp;the&nbsp;key&nbsp;`:nodes`,&nbsp;whose&nbsp;value&nbsp;shall&nbsp;be&nbsp;a&nbsp;sequence&nbsp;of&nbsp;vertices&nbsp;as
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009&nbsp;&nbsp;&nbsp;&nbsp;defined&nbsp;in&nbsp;`walkmap.vertex`.&quot;
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010&nbsp;&nbsp;&nbsp;&nbsp;[o]
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011&nbsp;&nbsp;&nbsp;&nbsp;(let
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012&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[v&nbsp;(:nodes&nbsp;o)]
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013&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(and
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014&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(seq?&nbsp;v)
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015&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(&gt;&nbsp;(count&nbsp;v)&nbsp;2)
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016&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(every?&nbsp;vertex?&nbsp;v))))
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017&nbsp;&nbsp;
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018&nbsp;&nbsp;(defn&nbsp;polygon-&gt;path
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019&nbsp;&nbsp;&nbsp;&nbsp;&quot;If&nbsp;`o`&nbsp;is&nbsp;a&nbsp;polygon,&nbsp;return&nbsp;an&nbsp;equivalent&nbsp;path.&nbsp;What&#x27;s&nbsp;different&nbsp;about
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020&nbsp;&nbsp;&nbsp;&nbsp;a&nbsp;path&nbsp;is&nbsp;that&nbsp;in&nbsp;polygons&nbsp;there&nbsp;is&nbsp;an&nbsp;implicit&nbsp;edge&nbsp;between&nbsp;the&nbsp;first
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021&nbsp;&nbsp;&nbsp;&nbsp;vertex&nbsp;and&nbsp;the&nbsp;last.&nbsp;In&nbsp;paths,&nbsp;there&nbsp;isn&#x27;t,&nbsp;so&nbsp;we&nbsp;need&nbsp;to&nbsp;add&nbsp;that
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022&nbsp;&nbsp;&nbsp;&nbsp;edge&nbsp;explicitly.
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023&nbsp;&nbsp;
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024&nbsp;&nbsp;&nbsp;&nbsp;If&nbsp;`o`&nbsp;is&nbsp;not&nbsp;a&nbsp;polygon,&nbsp;will&nbsp;throw&nbsp;an&nbsp;exception.&quot;
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025&nbsp;&nbsp;&nbsp;&nbsp;[o]
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026&nbsp;&nbsp;&nbsp;&nbsp;(if
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027&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(polygon?&nbsp;o)
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028&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(assoc&nbsp;(dissoc&nbsp;o&nbsp;:vertices)&nbsp;:nodes&nbsp;(concat&nbsp;(:vertices&nbsp;o)&nbsp;(list&nbsp;(first&nbsp;(:vertices&nbsp;o)))))
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029&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(throw&nbsp;(Exception.&nbsp;&quot;Not&nbsp;a&nbsp;polygon!&quot;))))
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030&nbsp;&nbsp;
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