/usr/share/doc/libghc-gloss-doc/html/src/Graphics-Gloss-Data-QuadTree.html is in libghc-gloss-doc 1.7.8.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 | <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<!-- Generated by HsColour, http://code.haskell.org/~malcolm/hscolour/ -->
<title>Graphics/Gloss/Data/QuadTree.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE RankNTypes #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>-- | A QuadTree can be used to recursively divide up 2D space into quadrants.</span>
<a name="line-4"></a><span class='hs-comment'>-- The smallest division corresponds to an unit `Extent`, so the total depth </span>
<a name="line-5"></a><span class='hs-comment'>-- of the tree will depend on what sized `Extent` you start with.</span>
<a name="line-6"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>QuadTree</span>
<a name="line-7"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>QuadTree</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-8"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>emptyTree</span>
<a name="line-9"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>emptyNode</span>
<a name="line-10"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>takeQuadOfTree</span>
<a name="line-11"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>liftToQuad</span>
<a name="line-12"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>insertByPath</span>
<a name="line-13"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>insertByCoord</span>
<a name="line-14"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>lookupNodeByPath</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>lookupByPath</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>lookupByCoord</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>flattenQuadTree</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>flattenQuadTreeWithExtents</span><span class='hs-layout'>)</span>
<a name="line-19"></a><span class='hs-keyword'>where</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Quad</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Extent</span>
<a name="line-22"></a>
<a name="line-23"></a><a name="QuadTree"></a><span class='hs-comment'>-- | The quad tree structure.</span>
<a name="line-24"></a><a name="QuadTree"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span>
<a name="line-25"></a> <span class='hs-comment'>-- | An empty node.</span>
<a name="line-26"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TNil</span>
<a name="line-27"></a>
<a name="line-28"></a> <span class='hs-comment'>-- | A leaf containint some value.</span>
<a name="line-29"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TLeaf</span> <span class='hs-varid'>a</span>
<a name="line-30"></a>
<a name="line-31"></a> <span class='hs-comment'>-- | A node with four children.</span>
<a name="line-32"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TNode</span> <span class='hs-layout'>(</span><span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- NW NE</span>
<a name="line-33"></a> <span class='hs-layout'>(</span><span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- SW SE</span>
<a name="line-34"></a> <span class='hs-keyword'>deriving</span> <span class='hs-conid'>Show</span>
<a name="line-35"></a>
<a name="line-36"></a>
<a name="line-37"></a><a name="emptyTree"></a><span class='hs-comment'>-- | A `TNil` tree.</span>
<a name="line-38"></a><span class='hs-definition'>emptyTree</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span>
<a name="line-39"></a><span class='hs-definition'>emptyTree</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TNil</span>
<a name="line-40"></a>
<a name="line-41"></a>
<a name="line-42"></a><a name="emptyNode"></a><span class='hs-comment'>-- | A node with `TNil`. for all its branches.</span>
<a name="line-43"></a><span class='hs-definition'>emptyNode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span>
<a name="line-44"></a><span class='hs-definition'>emptyNode</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TNode</span> <span class='hs-conid'>TNil</span> <span class='hs-conid'>TNil</span> <span class='hs-conid'>TNil</span> <span class='hs-conid'>TNil</span>
<a name="line-45"></a>
<a name="line-46"></a>
<a name="line-47"></a><a name="takeQuadOfTree"></a><span class='hs-comment'>-- | Get a quadrant from a node.</span>
<a name="line-48"></a><span class='hs-comment'>-- If the tree does not have an outer node then `Nothing`.</span>
<a name="line-49"></a><span class='hs-definition'>takeQuadOfTree</span>
<a name="line-50"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Quad</span>
<a name="line-51"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span>
<a name="line-52"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-53"></a>
<a name="line-54"></a><span class='hs-definition'>takeQuadOfTree</span> <span class='hs-varid'>quad</span> <span class='hs-varid'>tree</span>
<a name="line-55"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>tree</span> <span class='hs-keyword'>of</span>
<a name="line-56"></a> <span class='hs-conid'>TNil</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-57"></a> <span class='hs-conid'>TLeaf</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-58"></a> <span class='hs-conid'>TNode</span> <span class='hs-varid'>nw</span> <span class='hs-varid'>ne</span> <span class='hs-varid'>sw</span> <span class='hs-varid'>se</span>
<a name="line-59"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>quad</span> <span class='hs-keyword'>of</span>
<a name="line-60"></a> <span class='hs-conid'>NW</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>nw</span>
<a name="line-61"></a> <span class='hs-conid'>NE</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>ne</span>
<a name="line-62"></a> <span class='hs-conid'>SW</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>sw</span>
<a name="line-63"></a> <span class='hs-conid'>SE</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>se</span>
<a name="line-64"></a>
<a name="line-65"></a>
<a name="line-66"></a><a name="liftToQuad"></a><span class='hs-comment'>-- | Apply a function to a quadrant of a node.</span>
<a name="line-67"></a><span class='hs-comment'>-- If the tree does not have an outer node then return the original tree.</span>
<a name="line-68"></a><span class='hs-definition'>liftToQuad</span>
<a name="line-69"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Quad</span>
<a name="line-70"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-71"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span>
<a name="line-72"></a>
<a name="line-73"></a><span class='hs-definition'>liftToQuad</span> <span class='hs-varid'>quad</span> <span class='hs-varid'>f</span> <span class='hs-varid'>tree</span>
<a name="line-74"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>tree</span> <span class='hs-keyword'>of</span>
<a name="line-75"></a> <span class='hs-conid'>TNil</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>tree</span>
<a name="line-76"></a> <span class='hs-conid'>TLeaf</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>tree</span>
<a name="line-77"></a> <span class='hs-conid'>TNode</span> <span class='hs-varid'>nw</span> <span class='hs-varid'>ne</span> <span class='hs-varid'>sw</span> <span class='hs-varid'>se</span>
<a name="line-78"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>quad</span> <span class='hs-keyword'>of</span>
<a name="line-79"></a> <span class='hs-conid'>NW</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TNode</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>nw</span><span class='hs-layout'>)</span> <span class='hs-varid'>ne</span> <span class='hs-varid'>sw</span> <span class='hs-varid'>se</span>
<a name="line-80"></a> <span class='hs-conid'>NE</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TNode</span> <span class='hs-varid'>nw</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>ne</span><span class='hs-layout'>)</span> <span class='hs-varid'>sw</span> <span class='hs-varid'>se</span>
<a name="line-81"></a> <span class='hs-conid'>SW</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TNode</span> <span class='hs-varid'>nw</span> <span class='hs-varid'>ne</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>sw</span><span class='hs-layout'>)</span> <span class='hs-varid'>se</span>
<a name="line-82"></a> <span class='hs-conid'>SE</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TNode</span> <span class='hs-varid'>nw</span> <span class='hs-varid'>ne</span> <span class='hs-varid'>sw</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>se</span><span class='hs-layout'>)</span>
<a name="line-83"></a>
<a name="line-84"></a>
<a name="line-85"></a><a name="insertByPath"></a><span class='hs-comment'>-- | Insert a value into the tree at the position given by a path.</span>
<a name="line-86"></a><span class='hs-comment'>-- If the path intersects an existing `TLeaf` then return the original tree.</span>
<a name="line-87"></a><span class='hs-definition'>insertByPath</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Quad</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span>
<a name="line-88"></a>
<a name="line-89"></a><span class='hs-definition'>insertByPath</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>_</span>
<a name="line-90"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TLeaf</span> <span class='hs-varid'>x</span>
<a name="line-91"></a>
<a name="line-92"></a><span class='hs-definition'>insertByPath</span> <span class='hs-layout'>(</span><span class='hs-varid'>q</span><span class='hs-conop'>:</span><span class='hs-varid'>qs</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-varid'>tree</span>
<a name="line-93"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>tree</span> <span class='hs-keyword'>of</span>
<a name="line-94"></a> <span class='hs-conid'>TNil</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>liftToQuad</span> <span class='hs-varid'>q</span> <span class='hs-layout'>(</span><span class='hs-varid'>insertByPath</span> <span class='hs-varid'>qs</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>emptyNode</span>
<a name="line-95"></a> <span class='hs-conid'>TLeaf</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>tree</span>
<a name="line-96"></a> <span class='hs-conid'>TNode</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>liftToQuad</span> <span class='hs-varid'>q</span> <span class='hs-layout'>(</span><span class='hs-varid'>insertByPath</span> <span class='hs-varid'>qs</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>tree</span>
<a name="line-97"></a>
<a name="line-98"></a>
<a name="line-99"></a><a name="insertByCoord"></a><span class='hs-comment'>-- | Insert a value into the node containing this coordinate.</span>
<a name="line-100"></a><span class='hs-comment'>-- The node is created at maximum depth, corresponding to an unit `Extent`.</span>
<a name="line-101"></a><span class='hs-definition'>insertByCoord</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Extent</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Coord</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-102"></a><span class='hs-definition'>insertByCoord</span> <span class='hs-varid'>extent</span> <span class='hs-varid'>coord</span> <span class='hs-varid'>x</span> <span class='hs-varid'>tree</span>
<a name="line-103"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>path</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pathToCoord</span> <span class='hs-varid'>extent</span> <span class='hs-varid'>coord</span>
<a name="line-104"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>insertByPath</span> <span class='hs-varid'>path</span> <span class='hs-varid'>x</span> <span class='hs-varid'>tree</span>
<a name="line-105"></a>
<a name="line-106"></a>
<a name="line-107"></a><a name="lookupNodeByPath"></a><span class='hs-comment'>-- | Lookup a node based on a path to it.</span>
<a name="line-108"></a><span class='hs-definition'>lookupNodeByPath</span>
<a name="line-109"></a> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Quad</span><span class='hs-keyglyph'>]</span>
<a name="line-110"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span>
<a name="line-111"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-112"></a>
<a name="line-113"></a><span class='hs-definition'>lookupNodeByPath</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>tree</span>
<a name="line-114"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>tree</span>
<a name="line-115"></a>
<a name="line-116"></a><span class='hs-definition'>lookupNodeByPath</span> <span class='hs-layout'>(</span><span class='hs-varid'>q</span><span class='hs-conop'>:</span><span class='hs-varid'>qs</span><span class='hs-layout'>)</span> <span class='hs-varid'>tree</span>
<a name="line-117"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>tree</span> <span class='hs-keyword'>of</span>
<a name="line-118"></a> <span class='hs-conid'>TNil</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-119"></a> <span class='hs-conid'>TLeaf</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-120"></a> <span class='hs-conid'>TNode</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span>
<a name="line-121"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>let</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>quad</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>takeQuadOfTree</span> <span class='hs-varid'>q</span> <span class='hs-varid'>tree</span>
<a name="line-122"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>lookupNodeByPath</span> <span class='hs-varid'>qs</span> <span class='hs-varid'>quad</span>
<a name="line-123"></a>
<a name="line-124"></a>
<a name="line-125"></a><a name="lookupByPath"></a><span class='hs-comment'>-- | Lookup an element based given a path to it.</span>
<a name="line-126"></a><span class='hs-definition'>lookupByPath</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Quad</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span>
<a name="line-127"></a><span class='hs-definition'>lookupByPath</span> <span class='hs-varid'>path</span> <span class='hs-varid'>tree</span>
<a name="line-128"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>lookupNodeByPath</span> <span class='hs-varid'>path</span> <span class='hs-varid'>tree</span> <span class='hs-keyword'>of</span>
<a name="line-129"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>TLeaf</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span>
<a name="line-130"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-131"></a>
<a name="line-132"></a>
<a name="line-133"></a><a name="lookupByCoord"></a><span class='hs-comment'>-- | Lookup a node if a tree given a coordinate which it contains.</span>
<a name="line-134"></a><span class='hs-definition'>lookupByCoord</span>
<a name="line-135"></a> <span class='hs-keyglyph'>::</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span>
<a name="line-136"></a> <span class='hs-varop'>.</span> <span class='hs-conid'>Extent</span> <span class='hs-comment'>-- ^ Extent that covers the whole tree.</span>
<a name="line-137"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Coord</span> <span class='hs-comment'>-- ^ Coordinate of the value of interest.</span>
<a name="line-138"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span>
<a name="line-139"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span>
<a name="line-140"></a><span class='hs-definition'>lookupByCoord</span> <span class='hs-varid'>extent</span> <span class='hs-varid'>coord</span> <span class='hs-varid'>tree</span>
<a name="line-141"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>path</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pathToCoord</span> <span class='hs-varid'>extent</span> <span class='hs-varid'>coord</span>
<a name="line-142"></a> <span class='hs-varid'>lookupByPath</span> <span class='hs-varid'>path</span> <span class='hs-varid'>tree</span>
<a name="line-143"></a>
<a name="line-144"></a>
<a name="line-145"></a><a name="flattenQuadTree"></a><span class='hs-comment'>-- | Flatten a QuadTree into a list of its contained values, with coordinates.</span>
<a name="line-146"></a><span class='hs-definition'>flattenQuadTree</span>
<a name="line-147"></a> <span class='hs-keyglyph'>::</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span>
<a name="line-148"></a> <span class='hs-varop'>.</span> <span class='hs-conid'>Extent</span> <span class='hs-comment'>-- ^ Extent that covers the whole tree.</span>
<a name="line-149"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span>
<a name="line-150"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Coord</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-151"></a>
<a name="line-152"></a><span class='hs-definition'>flattenQuadTree</span> <span class='hs-varid'>extentInit</span> <span class='hs-varid'>treeInit</span>
<a name="line-153"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>flatten'</span> <span class='hs-varid'>extentInit</span> <span class='hs-varid'>treeInit</span>
<a name="line-154"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>flatten'</span> <span class='hs-varid'>extent</span> <span class='hs-varid'>tree</span>
<a name="line-155"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>tree</span> <span class='hs-keyword'>of</span>
<a name="line-156"></a> <span class='hs-conid'>TNil</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span>
<a name="line-157"></a> <span class='hs-conid'>TLeaf</span> <span class='hs-varid'>x</span>
<a name="line-158"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>takeExtent</span> <span class='hs-varid'>extent</span>
<a name="line-159"></a> <span class='hs-keyword'>in</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-160"></a>
<a name="line-161"></a> <span class='hs-conid'>TNode</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>concat</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>flattenQuad</span> <span class='hs-varid'>extent</span> <span class='hs-varid'>tree</span><span class='hs-layout'>)</span> <span class='hs-varid'>allQuads</span>
<a name="line-162"></a>
<a name="line-163"></a> <span class='hs-varid'>flattenQuad</span> <span class='hs-varid'>extent</span> <span class='hs-varid'>tree</span> <span class='hs-varid'>quad</span>
<a name="line-164"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>extent'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cutQuadOfExtent</span> <span class='hs-varid'>quad</span> <span class='hs-varid'>extent</span>
<a name="line-165"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>tree'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>takeQuadOfTree</span> <span class='hs-varid'>quad</span> <span class='hs-varid'>tree</span>
<a name="line-166"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>flatten'</span> <span class='hs-varid'>extent'</span> <span class='hs-varid'>tree'</span>
<a name="line-167"></a>
<a name="line-168"></a>
<a name="line-169"></a><a name="flattenQuadTreeWithExtents"></a><span class='hs-comment'>-- | Flatten a QuadTree into a list of its contained values, with coordinates.</span>
<a name="line-170"></a><span class='hs-definition'>flattenQuadTreeWithExtents</span>
<a name="line-171"></a> <span class='hs-keyglyph'>::</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span>
<a name="line-172"></a> <span class='hs-varop'>.</span> <span class='hs-conid'>Extent</span> <span class='hs-comment'>-- ^ Extent that covers the whole tree.</span>
<a name="line-173"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>QuadTree</span> <span class='hs-varid'>a</span>
<a name="line-174"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Extent</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-175"></a>
<a name="line-176"></a><span class='hs-definition'>flattenQuadTreeWithExtents</span> <span class='hs-varid'>extentInit</span> <span class='hs-varid'>treeInit</span>
<a name="line-177"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>flatten'</span> <span class='hs-varid'>extentInit</span> <span class='hs-varid'>treeInit</span>
<a name="line-178"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>flatten'</span> <span class='hs-varid'>extent</span> <span class='hs-varid'>tree</span>
<a name="line-179"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>tree</span> <span class='hs-keyword'>of</span>
<a name="line-180"></a> <span class='hs-conid'>TNil</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span>
<a name="line-181"></a> <span class='hs-conid'>TLeaf</span> <span class='hs-varid'>x</span>
<a name="line-182"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>extent</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-183"></a>
<a name="line-184"></a> <span class='hs-conid'>TNode</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>concat</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>flattenQuad</span> <span class='hs-varid'>extent</span> <span class='hs-varid'>tree</span><span class='hs-layout'>)</span> <span class='hs-varid'>allQuads</span>
<a name="line-185"></a>
<a name="line-186"></a> <span class='hs-varid'>flattenQuad</span> <span class='hs-varid'>extent</span> <span class='hs-varid'>tree</span> <span class='hs-varid'>quad</span>
<a name="line-187"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>extent'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cutQuadOfExtent</span> <span class='hs-varid'>quad</span> <span class='hs-varid'>extent</span>
<a name="line-188"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>tree'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>takeQuadOfTree</span> <span class='hs-varid'>quad</span> <span class='hs-varid'>tree</span>
<a name="line-189"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>flatten'</span> <span class='hs-varid'>extent'</span> <span class='hs-varid'>tree'</span>
<a name="line-190"></a>
<a name="line-191"></a>
</pre></body>
</html>
|