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<link rel="stylesheet" href="../coverage.css"/> <title> walkmap/svg.clj </title>
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<span class="covered" title="1 out of 1 forms covered">
001 (ns walkmap.svg
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002 "Utility functions for writing stereolithography (STL) files (and possibly,
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003 later, other geometry files of interest to us) as scalable vector graphics
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004 (SVG)."
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005 (:require [clojure.java.io :as io]
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006 [clojure.string :as s]
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007 [clojure.xml :as x]
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008 [dali.io :as neatly-folded-clock]
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009 [hiccup.core :refer [html]]
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010 [taoensso.timbre :as l :refer [info error spy]]
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011 [walkmap.ocean :refer [cull-ocean-facets]]
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<span class="not-tracked" title="0 out of 0 forms covered">
012 [walkmap.polygon :refer [polygon?]]
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013 [walkmap.stl :refer [decode-binary-stl]]
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014 [walkmap.vertex :refer [vertex?]]))
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015
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016 (def ^:dynamic *preferred-svg-render*
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017 "Mainly for debugging dali; switch SVG renderer to use. Expected values:
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018 `:dali`, `:hiccup`."
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019 :dali)
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020
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021 (defn- facet->svg-poly
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022 [facet]
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023 [:polygon
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024 {:points (s/join " " (map #(str (:x %) "," (:y %)) (:vertices facet)))}])
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025
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026 (defn- dali-facet->svg-poly
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027 [facet]
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028 (vec
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029 (cons
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030 :polygon
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031 (map #(vec (list (:x %) (:y %))) (:vertices facet)))))
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032
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033 (defn dali-stl->svg
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034 "Format this `stl` as SVG for the `dali` renderer on a page with these
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035 bounds."
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036 [stl minx maxx miny maxy]
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037 [:dali/page
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038 {:xmlns "http://www.w3.org/2000/svg"
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039 :version "1.2"
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<span class="not-covered" title="0 out of 4 forms covered">
040 :width (- maxx minx)
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041 :height (- maxy miny)
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<span class="not-covered" title="0 out of 11 forms covered">
042 :viewBox (s/join " " (map str [minx miny maxx maxy]))}
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043 (vec
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044 (cons
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045 :g
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046 (map
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047 dali-facet->svg-poly
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048 (:facets stl))))])
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049
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050 (defn hiccup-stl->svg
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051 "Format this `stl` as SVG for the `hiccup` renderer on a page with these
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052 bounds."
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053 [stl minx maxx miny maxy]
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054 [:svg
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055 {:xmlns "http://www.w3.org/2000/svg"
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056 :version "1.2"
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057 :width (- maxx minx)
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058 :height (- maxy miny)
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059 :viewBox (s/join " " (map str [minx miny maxx maxy]))}
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060 (vec
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061 (cons
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062 :g
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063 (map
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064 facet->svg-poly
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065 (:facets stl))))])
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066
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067 (defn stl->svg
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068 "Convert this in-memory `stl` structure, as read by `decode-binary-stl`, into
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069 an in-memory hiccup representation of SVG structure, and return it."
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070 [stl]
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071 (let [minx (reduce
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072 min
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073 (map
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074 #(reduce min (map :x (:vertices %)))
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075 (:facets stl)))
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076 maxx (reduce
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077 max
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078 (map
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079 #(reduce max (map :x (:vertices %)))
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080 (:facets stl)))
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081 miny (reduce
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082 min
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083 (map
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<span class="not-covered" title="0 out of 9 forms covered">
084 #(reduce min (map :y (:vertices %)))
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085 (:facets stl)))
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086 maxy (reduce
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087 max
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088 (map
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089 #(reduce max (map :y (:vertices %)))
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090 (:facets stl)))]
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091 (l/info "Generating SVG for " *preferred-svg-render* " renderer")
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092 (case *preferred-svg-render*
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<span class="not-covered" title="0 out of 7 forms covered">
093 :hiccup (hiccup-stl->svg stl minx maxx miny maxy)
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094 :dali (dali-stl->svg stl minx maxx miny maxy)
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<span class="not-covered" title="0 out of 4 forms covered">
095 (throw (Exception. "Unexpected renderer value: " *preferred-svg-render*)))))
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096
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097 (defn binary-stl-file->svg
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098 "Given only an `in-filename`, parse the indicated file, expected to be
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099 binary STL, and return an equivalent SVG structure. Given both `in-filename`
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100 and `out-filename`, as side-effect write the SVG to the indicated output file."
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101 ([in-filename]
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102 (stl->svg (cull-ocean-facets (decode-binary-stl in-filename))))
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103 ([in-filename out-filename]
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104 (let [s (binary-stl-file->svg in-filename)]
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105 (l/info "Emitting SVG with " *preferred-svg-render* " renderer")
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106 (case *preferred-svg-render*
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107 :dali (neatly-folded-clock/render-svg s out-filename)
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108 :hiccup (spit out-filename (html s))
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109 (throw (Exception. "Unexpected renderer value: " *preferred-svg-render*)))
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110 s)))
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