Started work on pre-computing geometry, to allow shuffling labels.

.gitignore

@@ -11,3 +11,7 @@ out
 *.tgz
 
 *.zip
+.lsp/
+.clj-kondo/
+
+*.svg

.lein-failures

@@ -0,0 +1 @@
+{}

README.md

@@ -1,6 +1,6 @@
-# swingometer
+# radial-svg-graph
 
-A [re-frame](https://github.com/Day8/re-frame) application designed to show votes in an election.
+A [re-frame](https://github.com/Day8/re-frame) application designed to show a radial SVG graph, possibly with several rings.
 
 ## Development Mode
 

project.clj

@@ -1,11 +1,18 @@
-(defproject swingometer "0.1.0-SNAPSHOT"
-  :dependencies [[org.clojure/clojure "1.8.0"]
-                 [org.clojure/clojurescript "1.9.229"]
-                 [reagent "0.6.0"]
-                 [re-frame "0.9.4"]
-                 [re-com "2.0.0"]]
+(defproject rsvggraph "0.1.0-SNAPSHOT"
+  :dependencies [[clojure2d "1.4.5"] ;; (mainly) for colours
+                 [generateme/fastmath "2.4.0"]
+                 [hiccup "2.0.0-RC3"]
+                 [javax.xml.bind/jaxb-api "2.4.0-b180830.0359"]
+                 [org.clojure/clojure "1.11.3"]
+                 [org.clojure/data.xml "0.0.8"]
+                ;;  [org.clojure/clojurescript "1.9.229"]
+                ;;  [org.omcljs/om "1.0.0-beta1"]
+                ;;  [reagent "0.6.0"]
+                ;;  [re-frame "0.9.4"]
+                ;;  [re-com "2.0.0"]
+                 ]
 
-  :plugins [[lein-cljsbuild "1.1.4"]]
+  ;; :plugins [[lein-cljsbuild "1.1.4"]]
 
   :min-lein-version "2.5.3"
 
@@ -15,36 +22,32 @@
 
   :figwheel {:css-dirs ["resources/public/css"]}
 
-  :profiles
-  {:dev
-   {:dependencies [[binaryage/devtools "0.8.2"]]
+  ;; :profiles
+  ;; {:dev
+  ;;  {:dependencies [[binaryage/devtools "0.8.2"]]
 
-    :plugins      [[lein-figwheel "0.5.9"]]
-    }}
+  ;;   :plugins      [[lein-figwheel "0.5.9"]]
+  ;;   }}
 
-  :cljsbuild
-  {:builds
-   [{:id           "dev"
-     :source-paths ["src/cljs"]
-     :figwheel     {:on-jsload "swingometer.core/mount-root"}
-     :compiler     {:main                 swingometer.core
-                    :output-to            "resources/public/js/compiled/app.js"
-                    :output-dir           "resources/public/js/compiled/out"
-                    :asset-path           "js/compiled/out"
-                    :source-map-timestamp true
-                    :preloads             [devtools.preload]
-                    :external-config      {:devtools/config {:features-to-install :all}}
-                    }}
+  ;; :cljsbuild
+  ;; {:builds
+  ;;  [{:id           "dev"
+  ;;    :source-paths ["src/cljs"]
+  ;;    :figwheel     {:on-jsload "rsvggraph.core/mount-root"}
+  ;;    :compiler     {:main                 rsvggraph.core
+  ;;                   :output-to            "resources/public/js/compiled/app.js"
+  ;;                   :output-dir           "resources/public/js/compiled/out"
+  ;;                   :asset-path           "js/compiled/out"
+  ;;                   :source-map-timestamp true
+  ;;                   :preloads             [devtools.preload]
+  ;;                   :external-config      {:devtools/config {:features-to-install :all}}
+  ;;                   }}
 
-    {:id           "min"
-     :source-paths ["src/cljs"]
-     :compiler     {:main            swingometer.core
-                    :output-to       "resources/public/js/compiled/app.js"
-                    :optimizations   :advanced
-                    :closure-defines {goog.DEBUG false}
-                    :pretty-print    false}}
-
-
-    ]}
-
-  )
+  ;;   {:id           "min"
+  ;;    :source-paths ["src/cljs"]
+  ;;    :compiler     {:main            rsvggraph.core
+  ;;                   :output-to       "resources/public/js/compiled/app.js"
+  ;;                   :optimizations   :advanced
+  ;;                   :closure-defines {goog.DEBUG false}
+  ;;                   :pretty-print    false}}]})
+)

resources/public/css/rsvggraph.css

@@ -1,70 +1,73 @@
 /***************************************************************************\
  *                                                                         *
- *      swinging-needle-meter.css                                          *
+ *      rsvggraph.css                                                      *
  *                                                                         *
- *      CSS styling for the swinging needle meter itself.                  *
+ *      CSS styling for the radial svg graph itself.                       *
  *                                                                         *
 \***************************************************************************/
 
-.snm-cursor {
+svg {
+	border: thin solid gray;
+	object-fit: contain;
+}
+
+.rsvggraph-cursor {
 	stroke:#ff8500;
 	stroke-width: 3%;
 	stroke-opacity: 0.5;
 }
 
-.snm-frame {
+.rsvggraph-frame {
 	fill: none;
-	stroke-width: 5%;
-	stroke-linejoin: round;
-	stroke: #444444;
+	stroke: none;
 }
 
-.snm-gradation path {
+.rsvggraph-gradation path {
   stroke: black;
   stroke-width: 1;
 }
 
-.snm-gradation text {
+.rsvggraph-gradation text {
   font-size: 200%;
   font-weight: lighter;
 }
 
-.snm-hub {
+.rsvggraph-hub {
 	fill: #444444;
 }
 
-.snm-meter {
+.rsvggraph-graph {
 	height: 50%;
 	width: auto;
 }
 
-.snm-needle {
+.rsvggraph-needle {
 	stroke: black;
 	stroke-width: 1;
 }
 
-.snm-redzone {
+.rsvggraph-redzone {
 	fill:none;
 	stroke: maroon;
 	stroke-width: 10%;
 }
 
-.snm-scale {
+.rsvggraph-scale {
 	fill: none;
 	stroke: silver;
 	stroke-width: 10%;
 }
 
-.snm-target .snm-frame {
+.rsvggraph-target .rsvggraph-frame {
   stroke: green;
 }
 
-.snm-value {
+.rsvggraph-value {
   font-size: 400%;
   font-weight: bold;
   text-align: center;
 }
 
-.snm-warning .snm-frame {
+.rsvggraph-warning .rsvggraph-frame {
   stroke: maroon;
 }

resources/public/index.html

@@ -5,16 +5,16 @@
     <link rel="stylesheet" href="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/css/bootstrap.min.css">
     <link rel="stylesheet" href="vendor/css/material-design-iconic-font.min.css">
     <link rel="stylesheet" href="css/re-com.css">
-    <link rel="stylesheet" href="css/swingometer.css">
+    <link rel="stylesheet" href="css/rsvggraph.css">
     <link href="http://fonts.googleapis.com/css?family=Roboto:300,400,500,700,400italic" rel="stylesheet" type="text/css">
     <link href="http://fonts.googleapis.com/css?family=Roboto+Condensed:400,300" rel="stylesheet" type="text/css">
 
 
-    <title>Example swingometer following re-com conventions.</title>
+    <title>Example rsvggraph following re-com conventions.</title>
   </head>
   <body>
     <div id="app"></div>
     <script src="js/compiled/app.js"></script>
-    <script>swingometer.core.init();</script>
+    <script>rsvggraph.core.init();</script>
   </body>
 </html>

resources/public/sample-data.edn

@@ -0,0 +1,130 @@
+{:id "ge2024"
+ :label "UK General Election 2024"
+ :colour "white"
+ :children [{:id "voted"
+             :label "Voted"
+             :color "chartreuse"
+             :children [{:id "labour"
+                         :label "Labour"
+                         :colour "red"
+                         :quantity 9712011
+                         :children [{:id "other"
+                                     :label "Other"
+                                     :colour "silver"
+                                     :quantity 291140}
+                                    {:id "negative"
+                                     :label "Negative"
+                                     :colour "silver"
+                                     :children [{:id "anti-tory"
+                                                 :label "To get the Tories out"
+                                                 :colour "#424242"
+                                                 :quantity 4658234}
+                                                {:id "change"
+                                                 :label "The country needs a change"
+                                                 :colour "#424242"
+                                                 :quantity 1261605}
+                                                {:id "nhs"
+                                                 :label "To support the NHS"
+                                                 :colour "#424242"
+                                                 :quantity 388186}
+                                                {:id "alternative"
+                                                 :label "The best alternative"
+                                                 :quantity 388186}
+                                                {:id "anti-sunak"
+                                                 :label "Rishi Sunak"
+                                                 :colour "#424242"
+                                                 :quantity 97047}
+                                                {:id "anti-snp"
+                                                 :label "To oust the SNP"
+                                                 :colour "#424242"
+                                                 :quantity 97047}]}
+                                    {:id "positive"
+                                     :label "Positive"
+                                     :colour "red"
+                                     :children [{:id "policies"
+                                                 :label "Agree with policies"
+                                                 :colour "#d32f2f"
+                                                 :quantity 485233}
+                                                {:id "mp"
+                                                 :label "Like my MP"
+                                                 :colour "#d32f2f"
+                                                 :quantity 194093}
+                                                {:id "fairer"
+                                                 :label "For a fairer society"
+                                                 :colour "#d32f2f"
+                                                 :quantity 194093}
+                                                {:id "habit"
+                                                 :label "I always vote Labour"
+                                                 :colour "#d32f2f"
+                                                 :quantity 194093}
+                                                {:id "honesty"
+                                                 :quantity 194093}
+                                                {:id "caop"
+                                                 :label "Care about ordinary people"
+                                                 :colour "#d32f2f"
+                                                 :quantity 97047}
+                                                {:id "fwc"
+                                                 :label "For working class"
+                                                 :colour "#d32f2f"
+                                                 :quantity 97047}
+                                                {:id "cl"
+                                                 :label "Address cost of living"
+                                                 :colour "#d32f2f"
+                                                 :quantity 97047}
+                                                {:id "stability"
+                                                 :label "Economic stability"
+                                                 :colour "#d32f2f"
+                                                 :quantity 97047}
+                                                {:id "pro-starmer"
+                                                 :label "Keir Starmer"
+                                                 :colour "#d32f2f"
+                                                 :quantity 97047}
+                                                {:id "services"
+                                                 :label "Better public services"
+                                                 :colour "#d32f2f"
+                                                 :quantity 97047}]}]}
+                        {:id "con"
+                         :label "Conservative"
+                         :colour "blue"
+                         :quantity 6814469}
+                        {:id "ld"
+                         :label "Liberal Democrats"
+                         :colour "gold"
+                         :quantity 3499933}
+                        {:id "snp"
+                         :label "Scottish National Party"
+                         :colour "yellow"
+                         :quantity 708759}
+                        {:id "sf"
+                         :label "Sinn Féin"
+                         :quantity 210891}
+                        {:id "independents"
+                         :label "Independents"
+                         :colour "silver"
+                         :quantity 564243}
+                        {:id "reform"
+                         :label "Reform UK"
+                         :colour "cyan"
+                         :quantity 4091549}
+                        {:id "greenew"
+                         :label "Green Party"
+                         :colour "green"
+                         :quantity 1939502}
+                        {:id "pc"
+                         :label "Plaid Cymru"
+                         :colour "#005b54"
+                         :quantity 194811}
+                        {:id "dup"
+                         :label "DUP"
+                         :quantity 172058}
+                        {:id "apni"
+                         :label "Alliance Party"
+                         :colour "#f6cb2f"
+                         :quantity 117191}
+                        {:id "sdlp"
+                         :label "SDLP"
+                         :quantity 86861}]}
+            {:id "no-show"
+             :label "Did not vote"
+             :colour "silver"
+             :quantity 18365357}]}

src/clj/rsvggraph/core.clj

@@ -0,0 +1,214 @@
+(ns rsvggraph.core
+  (:require [clojure.math :refer [cos floor PI sin]]
+            [clojure.string :refer [join replace]]
+            [clojure.xml :refer [emit]]
+            [hiccup2.core :refer [html]]
+            [rsvggraph.data :refer [normalise]]))
+
+
+(def ^:dynamic *background* "white")
+
+(def ^:dynamic *foreground* "black")
+
+;; TODO: Right, so most of this is good. But I need to adjust the positions
+;; of minor segment labels -- by sliding some of them sideways -- before 
+;; rendering. So probably what I need to do is one pass through the data
+;; structure, tagging each node with geometry information (especially for
+;; minor segment labels); then a second pass to sort out spacial collisions;
+;; and don't try to generate the SVG until that has been done. But I need
+;; *all* the geometry to be complete.
+
+(defn polar-to-cartesian
+  "Return, as a map with keys :x. :y, the cartesian coordinates at the point
+   `radius` distance at `theta` (degrees) angle from a point at
+   cartesian coordinates `cx`, `cy`."
+  [geometry]
+  (let
+   [in-radians (/ (* (- (:angle geometry) 90) PI) 180.0)]
+    {:x (+ (:cx geometry) (* (:radius geometry) (cos in-radians)))
+     :y (+ (:cy geometry) (* (:radius geometry) (sin in-radians)))}))
+
+(defn describe-arc
+  "Return as a string an SVG path definition describing an arc centred
+   at `cx`, cy` starting at `start-angle` and ending at `end-angle` (both
+   angles in degrees)."
+  [geometry start-angle end-angle]
+  (let
+   [start (polar-to-cartesian (assoc geometry :angle start-angle))
+    end (polar-to-cartesian (assoc geometry :angle end-angle))
+    large-arc? (if (<= (- end-angle start-angle) 180) 0 1)
+    radius (:radius geometry)
+    sweep (if (> end-angle start-angle) 1 0)]
+    (join " "
+          ["M" (:x start) (:y start) "A" radius radius 0 large-arc? sweep
+           (:x end) (:y end)])))
+
+(def ^:dynamic *minor-segment-threshold* 0.08)
+
+(defn- minor-segment? [datum]
+  (< (- (:right datum) (:left datum)) *minor-segment-threshold*))
+
+(defn- font-size [thickness]
+  (int (* 0.15 thickness)))
+
+(defn left-half?
+  [datum]
+  (> (+ (:left datum) (:right datum)) 1))
+
+(defn- label-width
+  "Return the anticipated width of the label associated with this `datum`."
+  [datum thickness]
+  (* (count (:label datum)) (font-size thickness)))
+
+(defn- text-path [datum tp-id geometry thickness start-angle end-angle]
+  [:path {:class "rsvggraph-text-path"
+          :id tp-id
+          :style {:fill "none"
+                  :stroke "none"}
+          :d (let [angle (if (left-half? datum) start-angle end-angle)
+                   radius (:radius geometry)
+                   end (polar-to-cartesian (assoc geometry :radius (* 1.2 (:radius geometry)) :angle angle))
+                   height (int (:y end))]
+               (if (minor-segment? datum)
+                 (if (left-half? datum)
+                   (format "M %d %d L %d %d" (- (int (:x end)) (label-width datum thickness)) height
+                           (int (:x end)) height)
+                   (format "M %d %d L %d %d" (int (:x end)) height (:width geometry) height))
+                 (describe-arc (assoc geometry :radius (- radius (* 0.9 thickness)))
+                               start-angle end-angle)))}])
+
+(defn- label-indicator-path [geometry angle]
+  (let [start (polar-to-cartesian (assoc geometry :angle angle))
+        end (polar-to-cartesian
+             (assoc geometry :radius (* 1.2 (:radius geometry)) :angle angle))]
+    (format "M %d %d L %d %d" (int (:x start)) (int (:y start))
+            (int (:x end)) (int (:y end)))))
+
+(defn- label-indicator [datum geometry start-angle end-angle]
+  (when (minor-segment? datum) [:path {:class "rsvggraph-minor-label-indicator" :style {:fill "none" :stroke *foreground* :stroke-width "thin"}
+                                       :d (label-indicator-path geometry (if (left-half? datum) start-angle end-angle))}]))
+
+(defn segment-geometry
+  [datum geometry]
+  (let [thickness (/ (:radius geometry) (:ring datum))
+        left? (left-half? datum)
+        start-angle (* (:left datum) 360)
+        end-angle (* (:right datum) 360)
+        angle (if left? start-angle end-angle)
+        kink (polar-to-cartesian
+              (assoc geometry :radius (* 1.2 (:radius geometry)) :angle angle))
+        label-bottom (int (:y kink))]
+    (merge geometry
+           {:thickness thickness
+            :radius (- (:radius geometry) (/ thickness 2))
+            :start-angle start-angle
+            :end-angle end-angle
+            :text-box (when (minor-segment? datum) 
+                        {:left (if left? (- (int (:x kink)) (label-width datum thickness))
+                                                              (int (:x kink))) 
+                         :right (if left? (int (:x kink))
+                                    (+ (int (:x kink)) (label-width datum thickness))) 
+                         :bottom label-bottom
+                         :top (+ label-bottom (font-size datum))})})))
+
+(defn draw-segment
+  [datum geometry]
+  (println (format "Radius: %s; ring: %s." (:radius geometry) (:ring datum)))
+  (let [thickness (/ (:radius geometry) (:ring datum));; (/ 1 (pow 3 (:ring datum)))
+        radius (- (:radius geometry) (/ thickness 2))
+        start-angle (* (:left datum) 360)
+        end-angle (* (:right datum) 360)
+        id (str (:id datum) "-segment")
+        tp-id (str "tp-" id)
+        path-data (describe-arc (assoc geometry :radius radius)
+                                start-angle end-angle)]
+    [:g {:id (str id "group")}
+     [:path {:class "rsvggraph-segment"
+             :id id
+             :style {:fill "none"
+                     :stroke (:colour datum)
+                     :stroke-width thickness}
+             :d path-data}]
+     (text-path datum tp-id geometry thickness start-angle end-angle)
+     (label-indicator datum geometry start-angle end-angle)
+     [:text {:style {:fill *foreground*
+                     :font-family "sans-serif"
+                     :font-weight "bold"
+                     :font-size (str (font-size thickness))}}
+      [:textPath {:xlink:href (str "#" tp-id)
+                  :startOffset "2%"} [:tspan (format "%s: %.2f%%" (:label datum) (* 100 (:proportion datum)))]]]]))
+
+;; <text
+;;      xml:space="preserve"
+;;      style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:32px;font-family:sans-serif;-inkscape-font-specification:'sans-serif Bold';fill:#ffcc00;stroke-width:4.9852"
+;;      id="text562"><textPath
+;;        xlink:href="#no-show-segment"
+;;        id="textPath770"><tspan
+;;          id="tspan560">Did not vote</tspan></textPath></text>
+
+(defn flatten-data
+  [data]
+  (cond (empty? (:children data)) data
+        :else (flatten (cons (dissoc data :children) (map flatten-data (:children data))))))
+
+(defn- circle
+  [data geometry]
+  [:circle {:id (str (:id data) "-background")
+            :cx (:cx geometry)
+            :cy (:cy geometry)
+            :r (:radius geometry)
+            :style {:fill "white"}}])
+
+(defn- cantre-label [data geometry]
+  [:text
+   {:text-anchor "middle"
+    :x (:cx geometry)
+    :y (:cy geometry)
+    :width (/ (:diameter geometry) 4)
+    :id (str (:id data) "-title")
+    :style {:font-family "sans-serif"
+            :font-weight "bold"}
+    :class "rsvggraph-value"} [:tspan (:label data) ": " (:quantity data)]])
+
+(defn base-geometry
+  [diameter]
+  (let [height (* 1.5 diameter)
+        width (* 2 diameter)]
+    {:cx (/ width 2)
+     :cy (/ height 2)
+     :diameter diameter
+     :height height
+     :radius (/ diameter 2)
+     :width width}))
+
+(defn data->svg
+  [data diameter]
+  (let [data' (normalise data)
+        height (* 2 diameter)
+        width (* 3 diameter)
+        geometry (base-geometry diameter)]
+    [:svg {:xmlSpace "preserve"
+           :overflow "visible"
+           :viewBox (join " " [0 0 height height])
+           :width (str width "px")
+           :height (str height "px")
+           :y "0px"
+           :x "0px"
+           :version "1.1"
+           :id (:id data')
+           :class (str "rsvggraph-graph")
+           :xmlns "http://www.w3.org/2000/svg"
+           :xmlns:xlink "http://www.w3.org/1999/xlink"}
+     (circle data' geometry)
+     (cantre-label data' geometry)
+     (map #(draw-segment % geometry) (flatten-data data'))]))
+
+(defn data->svg-file
+  [data diameter path]
+  (emit (data->svg data diameter)))
+
+(defn data->html-file
+  [data diameter path]
+  (spit path (join "\n"
+                   ["<?xml version='1.0' encoding='UTF-8'?>"
+                    (replace (html (data->svg data diameter)) #"\> *\<" ">\n<")])))

src/clj/rsvggraph/data.clj

@@ -0,0 +1,89 @@
+(ns rsvggraph.data
+  "Normalise data for use in generating radial graphs. A lot of the things
+   I want to do here, especially with colour, are not readily portable between
+   clojure and clojurescript, so this is Clojure only for now."
+  (:require [clojure2d.color :refer [format-hex gradient]]
+            [fastmath.core :refer [pow]]))
+
+
+(def ^:dynamic *gradient*
+  "The gradient to use to automatically assign pleasing colours to sectors, if
+   no colours are defined in the data. Suitable gradients are defined 
+   [here](https://clojure2d.github.io/clojure2d/docs/static/gradients/)."
+  :rainbow2)
+
+(def ^:dynamic *children*
+  "Basic (overridable) children function; assumes `data` is a map, and returns 
+   the value of the `:children` key within that map."
+  (memoize (fn [data]
+             (:children data))))
+
+(def ^:dynamic *quantity*
+  "Basic (overridable) children function; assumes `data` is a map. If the value
+   of the `:children` key within that map is a sequence, sums the result of 
+   mapping itself over that sequence. Otherwise, returns the value of the 
+   `:quantity` key, if present and a number, or `1` as a final default."
+  (memoize (fn [data]
+             (let [c (*children* data)
+                   q (:quantity data)]
+               (cond (number? q) q
+                     (coll? c) (reduce + 0 (map *quantity* c)) 
+                     :else 1)))))
+
+(def ^:dynamic *colour*
+  "Return, as a hex string acceptable to HTML and CSS, the appropriate colour
+   for this `datum` having this `central-quantity-fraction` as the centre of
+   its position in the arc."
+  (fn [data central-quantity-fraction]
+    (let [col (:colour data)
+          grad (gradient *gradient*)]
+      (cond
+        col col
+        (number? data) (format-hex (grad data))
+        (number? central-quantity-fraction) (format-hex (grad central-quantity-fraction))
+        :else "gray"))))
+
+(def proportion
+  (memoize
+   (fn [data total]
+     (double (/ (*quantity* data) total)))))
+
+(defn normalise
+  ([data]
+   (normalise data 1 (*quantity* data) 0))
+  ([data ring total left]
+   (let [id (or (:id data)
+                (keyword (gensym (or (:title data) "datum"))))
+         q (*quantity* data)
+         p (proportion data total)
+         color (*colour* data (+ left (/ p 2)))]
+     (assoc data
+            :children
+            (when (:children data)
+              (loop [c (first (:children data))
+                     l left
+                     y (rest (:children data))
+                     v nil]
+                (let [r (+ l (proportion c total))
+                      c' (assoc
+                                (normalise c (inc ring) total l)
+                                :left l
+                                :right r)
+                      v' (cons c' v)]
+                  ;; (println (format "Label: %s: ring: %d; left: %f; right: %f; colour %s." 
+                                  ;;  (:label c') ring (double l) r color))
+                  (cond (empty? y) (vec v')
+                        :else
+                        (recur (first y)
+                               r
+                               (rest y)
+                               v')))))
+            :colour color
+            :id id
+            :inner-diameter (/ 1 (pow 3 ring))
+            :label (or (:label data) id)
+            :left 0
+            :proportion p
+            :quantity q
+            :right 1
+            :ring ring))))

src/clj/swingometer/core.clj

@@ -1 +0,0 @@
-(ns swingometer.core)

src/cljs/rsvggraph/config.cljs

@@ -1,4 +1,4 @@
-(ns swingometer.config)
+(ns rsvggraph.config)
 
 (def debug?
   ^boolean goog.DEBUG)

src/cljs/rsvggraph/core.cljs

@@ -1,10 +1,10 @@
-(ns swingometer.core
+(ns rsvggraph.core
   (:require [reagent.core :as reagent]
             [re-frame.core :as re-frame]
-            [swingometer.events]
-            [swingometer.subs]
-            [swingometer.views :as views]
-            [swingometer.config :as config]))
+            [rsvggraph.events]
+            [rsvggraph.subs]
+            [rsvggraph.views :as views]
+            [rsvggraph.config :as config]))
 
 
 (defn dev-setup []

src/cljs/rsvggraph/db.cljs

@@ -1,4 +1,4 @@
-(ns swingometer.db)
+(ns rsvggraph.db)
 
 (def default-db
   {:name "re-frame"})

src/cljs/rsvggraph/events.cljs

@@ -1,6 +1,6 @@
-(ns swingometer.events
+(ns rsvggraph.events
   (:require [re-frame.core :as re-frame]
-            [swingometer.db :as db]))
+            [rsvggraph.db :as db]))
 
 (re-frame/reg-event-db
  :initialize-db

src/cljs/rsvggraph/rsvggraph.cljs

@@ -1,14 +1,13 @@
-(ns swingometer.swingometer
+(ns rsvggraph.rsvggraph
   (:require [clojure.string :as string]
             [re-com.core     :refer [h-box v-box box gap line label title slider checkbox p]]
             [re-com.box      :refer [flex-child-style]]
             [re-com.util     :refer [deref-or-value]]
-            [re-com.validate :refer [number-or-string? css-style? html-attr? validate-args-macro]]
-            [reagent.core    :as    reagent]))
+            [re-com.validate :refer [number-or-string? css-style? html-attr? validate-args-macro]]))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;;;
-;;;; swingometer: an experiment in animating SVG from re-frame.
+;;;; rsvggraph: an experiment in animating SVG from re-frame.
 ;;;; Draws heavily on re-com..
 ;;;;
 ;;;; This program is free software; you can redistribute it and/or
@@ -31,12 +30,12 @@
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 ;; ------------------------------------------------------------------------------------
-;;  Component: swingometer
+;;  Component: rsvggraph
 ;; ------------------------------------------------------------------------------------
 
 ;;; It seems the defaults given here are just documentation; the defaults
 ;;; that are actually used are those given in the :or clause of the argument map.
-(def swingometer-args-desc
+(def rsvggraph-args-desc
   [{:name :model         :required true  :type "map | atom"
     :validate-fn map? :description "A map mapping keys to maps of the following structure: {:id :snp :name \"Scottish National Party\" :colour \"yellow\" :votes 1234}"}
    {:name :width         :required false :type "integer"                 :default "300"
@@ -45,12 +44,12 @@
     :validate-fn integer?          :description "a CSS height"}
    {:name :class         :required false :type "string"
     :validate-fn string?           :description "CSS class names, space separated, for the top-level SVG element"}
-   {:name :frame-class   :required false :type "string"                 :default "snm-frame"
+   {:name :frame-class   :required false :type "string"                 :default "rsvggraph-frame"
     :validate-fn string?           :description "CSS class names, space separated, for the frame"}
-   {:name :scale-class   :required false :type "string"                 :default "snm-scale"
+   {:name :scale-class   :required false :type "string"                 :default "rsvggraph-scale"
     :validate-fn string?           :description "CSS class names, space separated, for the scale"}
-   {:name :id            :required false :type "string"                 :default "meter"
-    :validate-fn string?           :description "Element id for this instance of the meter"}
+   {:name :id            :required false :type "string"                 :default "graph"
+    :validate-fn string?           :description "Element id for this instance of the graph"}
    {:name :gradations    :reduired false :type "integer"                :default 5
     :validate-fn integer?          :description "Number of gradations to show on the scale, not counting the point."}
    {:name :style         :required false :type "CSS style map"
@@ -59,9 +58,9 @@
     :validate-fn html-attr?        :description [:span "HTML attributes, like " [:code ":on-mouse-move"] [:br] "No " [:code ":class"] " or " [:code ":style"] "allowed"]}])
 
 
-;; the constant 140 represents the full sweep of the needle
-;; from the left end of the scale to right end, in degrees.
-(def full-scale-deflection 140)
+(def full-scale-deflection
+  "the full sweep of the needle from the left end of the scale to right end, in degrees."
+  360)
 
 
 (defn deflection
@@ -112,7 +111,7 @@
   at `cx`, cy` starting at `min-radius` and extending to `max-radius`, with the specified
   `label`."
   [cx cy min-radius max-radius angle label]
-  [:g {:class "snm-gradation"
+  [:g {:class "rsvggraph-gradation"
        :transform (string/join " " ["rotate(" angle cx cy ")"])}
    [:path {:d (string/join
                 " "
@@ -157,63 +156,68 @@
           others (recursively-draw-segments (rest still-to-do) (cons party done) total-votes cx cy radius)
           vote-share (* (/ (:votes party) total-votes) 100)]
       (if (> vote-share 1)
-        (cons [:g [:path {:class "snm-scale"
+        (cons [:g [:path {:class "rsvggraph-scale"
                           :id (str (:id party) "-segment")
                           :style {:stroke (:colour party)}
                           :d (describe-arc cx cy radius start-angle end-angle)}]
                (gradation cx cy (* radius 0.8) (* radius 1.1) start-angle
                           (str
-                            (if (> vote-share 5) (name (:id party)) "")
-                            (if (> vote-share 10) (str " " (as-label vote-share) "%"))))]
+                            (when (> vote-share 5) (name (:id party)) "")
+                            (when (> vote-share 10) (str " " (as-label vote-share) "%"))))]
               others)
         others))))
 
 
-(defn swingometer
-  "Render an SVG swinging needle meter"
+(defn rsvggraph
+  "Render an SVG radial graph. The idea here is there is a stack of rings,
+   each with zero or more segments. Each ring has an inner diameter and an 
+   outer diameter, each of which is expressed as a number in the range 0...1,
+   representing a fraction of the overall dimension of the graph. 
+   
+   The rings are drawn in ascending order of inner diameter.
+   
+   Each segment has a label and a magnitude"
   [& {:keys [model width height class scale-class frame-class id style attr]
       :or   {width          300
-             height         200
-             scale-class    "snm-scale"
-             frame-class    "snm-frame"
-             id "meter"}
+             height         300
+             scale-class    "rsvggraph-scale"
+             frame-class    "rsvggraph-frame"
+             id "graph"}
       :as   args}]
-  {:pre [(validate-args-macro swingometer-args-desc args "swingometer")]}
+  {:pre [(validate-args-macro rsvggraph-args-desc args "rsvggraph")]}
   (let [model (deref-or-value model)
         mid-point-deflection (/ full-scale-deflection 2)
-        cx (/ width 2)
-        cy (* height 0.90)
-        needle-length (* height 0.75)
-        scale-radius (* height 0.7)
-        gradation-inner (* height 0.55)
-        gradations 5
+        dimension (min width height)
+        cx (/ dimension 2)
+        cy (* dimension 0.50)
+        scale-radius (* dimension 0.45)
         total-votes (reduce + (map #(:votes %) (vals model)))]
     [box
      :align :start
      :child [:div
              (merge
-               {:class (str "swingometer  " class)
+               {:class (str "rsvggraph  " class)
                 :style (merge (flex-child-style "none")
-                              {:width width :height height}
+                              {:width dimension :height dimension}
                               style)}
                attr)
              [:svg {:xmlSpace "preserve"
                     :overflow "visible"
-                    :viewBox (string/join " " [0 0 width height])
-                    :width (str width "px")
-                    :height (str height "px")
+                    :viewBox (string/join " " [0 0 dimension dimension])
+                    :width (str dimension "px")
+                    :height (str dimension "px")
                     :y "0px"
                     :x "0px"
                     :version "1.1"
                     :id id
-                    :class (str "snm-meter " class)}
+                    :class (str "rsvggraph-graph " class)}
                             [:text
                {:text-anchor "middle"
-                :x (/ width 2)
-                :y (/ height 2)
-                :width "100"
+                :x (/ dimension 2)
+                :y (/ dimension 2)
+                :width (/ dimension 4)
                 :id (str id "-total-votes")
-                :class "snm-value"}[:tspan (reduce + (map :votes (vals model)))]]
+                :class "rsvggraph-value"}[:tspan (reduce + (map :votes (vals model)))]]
               [:path {:class scale-class
                       :id (str id "-scale")
                       :d (describe-arc cx cy scale-radius

src/cljs/rsvggraph/subs.cljs

@@ -1,4 +1,4 @@
-(ns swingometer.subs
+(ns rsvggraph.subs
   (:require-macros [reagent.ratom :refer [reaction]])
   (:require [re-frame.core :as re-frame]))
 

src/cljs/rsvggraph/utils.cljs

@@ -1,4 +1,4 @@
-(ns swingometer.utils
+(ns rsvggraph.utils
   (:require [re-com.core :refer [h-box v-box box gap title line label hyperlink-href align-style]]))
 
 ;;;; This file is just stolen wholesale from re-demo in the re-com package;

src/cljs/rsvggraph/views.cljs

@@ -1,12 +1,12 @@
-(ns swingometer.views
+(ns rsvggraph.views
   (:require [re-frame.core :as    re-frame]
             [re-com.core   :refer [h-box v-box box gap line label title progress-bar slider checkbox p single-dropdown]]
             [re-com.util   :refer [deref-or-value]]
-            [swingometer.swingometer :refer [swingometer  swingometer-args-desc]]
-            [swingometer.utils   :refer [panel-title title2 args-table github-hyperlink status-text]]
+            [rsvggraph.rsvggraph :refer [rsvggraph  rsvggraph-args-desc]]
+            [rsvggraph.utils   :refer [panel-title title2 args-table github-hyperlink status-text]]
             [reagent.core  :as    reagent]))
 
-(defn swingometer-demo
+(defn rsvggraph-demo
   []
   (let [model (reagent/atom {:snp {:id :snp :name "Scottish National Party" :colour "yellow" :votes 10}
                              :lab {:id :lab :name "Labour Party" :colour "red" :votes 10}
@@ -19,7 +19,7 @@
       [v-box
        :size     "auto"
        :gap      "10px"
-       :children [[panel-title "Swingometer"]
+       :children [[panel-title "rsvggraph"]
                   [h-box
                    :gap      "100px"
                    :children [[v-box
@@ -27,21 +27,21 @@
                                :width    "450px"
                                :children [[title2 "Notes"]
                                           [status-text "Wildly experimental"]
-                                          [p "An SVG swingometer intended to be useful in elections."]
+                                          [p "An SVG rsvggraph intended to be useful in elections."]
 
                                           [title2 "Behaviour"]
 
 
-                                          [args-table swingometer-args-desc]]]
+                                          [args-table rsvggraph-args-desc]]]
                               [v-box
                                :gap      "10px"
                                :children [[title2 "Demo"]
                                           [v-box
                                            :gap      "20px"
-                                           :children [[swingometer
+                                           :children [[rsvggraph
                                                        :model     model
-                                                       :height    600
-                                                       :width     1000]
+                                                       :height    500
+                                                       :width     500]
                                                       [title :level :level3 :label "Parameters"]
                                                       [h-box
                                                        :gap "10px"
@@ -127,11 +127,11 @@
 ;; core holds a reference to panel, so need one level of indirection to get figwheel updates
 (defn panel
   []
-  [swingometer-demo])
+  [rsvggraph-demo])
 
 
 (defn main-panel []
   (fn []
     [v-box
      :height "100%"
-     :children [[swingometer-demo]]]))
+     :children [[rsvggraph-demo]]]))