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By Jove! I think he's got it!

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Simon Brooke 2024-07-09 23:21:26 +01:00
parent 240b76c889
commit 2b6388de9d
3 changed files with 66 additions and 30 deletions
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65
src/clj/rsvggraph/core.clj
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@ -1,12 +1,15 @@
(ns rsvggraph.core
(:require [clojure.math :refer [cos PI sin]]
(:require [clojure.math :refer [cos floor PI sin]]
[clojure.string :refer [join replace]]
[clojure.xml :refer [emit]]
[fastmath.core :refer [pow]]
[hiccup2.core :refer [html]]
[rsvggraph.data :refer [normalise]]))
(def ^:dynamic *background* "white")
(def ^:dynamic *foreground* "black")
(defn polar-to-cartesian
"Return, as a map with keys :x. :y, the cartesian coordinates at the point
@ -30,6 +33,21 @@
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)])))
(defn- text-path [datum tp-id diameter thickness start-angle end-angle]
[:path {:class "rsvggraph-text-path"
:id tp-id
:style {:fill "none"
:stroke "none"}
:d (let [angle (/ (+ start-angle end-angle) 2)
radius (/ diameter 2)
start (polar-to-cartesian diameter diameter radius angle)
end (polar-to-cartesian diameter diameter diameter angle)]
(if (< (- (:right datum) (:left datum)) 0.08)
(format "M %d %d L %d %d" (int (:x start)) (int (:y start))
(int (:x end)) (int (:y end)))
(describe-arc diameter diameter (- radius (* 0.9 thickness)) start-angle end-angle)))}])
(defn draw-segment
[datum diameter]
(let [r' (/ diameter 2)
@ -38,7 +56,8 @@
start-angle (* (:left datum) 360)
end-angle (* (:right datum) 360)
id (str (:id datum) "-segment")
path-data (describe-arc r' r' radius start-angle end-angle)]
tp-id (str "tp-" id)
path-data (describe-arc diameter diameter radius start-angle end-angle)]
;; (println (format "Id: %s; radius: %s; start: %s; end: %s; thickness %s" id radius start-angle end-angle thickness))
[:g {:id (str id "group")}
[:path {:class "rsvggraph-segment"
@ -47,39 +66,51 @@
:stroke (:colour datum)
:stroke-width thickness}
:d path-data}]
[:text [:textPath {:href (str "#" id)
:path path-data} (:label datum)]]]))
(text-path datum tp-id diameter thickness start-angle end-angle)
[:text {:style {:fill *foreground*
:font-family "sans-serif"
:font-weight "bold"
:font-size (str (floor (* 0.2 thickness)))}}
[:textPath {:xlink:href (str "#" tp-id)} [:tspan (:label 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))))))
(def ^:dynamic *background* "white")
(def ^:dynamic *foreground* "black")
(defn data->svg
[data diameter]
(let [data' (normalise data)]
(let [data' (normalise data)
dimension (* 2 diameter)]
[:svg {:xmlSpace "preserve"
:overflow "visible"
:viewBox (join " " [0 0 diameter diameter])
:width (str diameter "px")
:height (str diameter "px")
:viewBox (join " " [0 0 dimension dimension])
:width (str dimension "px")
:height (str dimension "px")
:y "0px"
:x "0px"
:version "1.1"
:id (:id data')
:class (str "rsvggraph-graph")
:xmlns "http://www.w3.org/2000/svg"}
[:circle {:id (str (:id data') "-background") :cx (/ diameter 2) :cy (/ diameter 2) :r (/ diameter 2) :style {:fill "white"}}]
:xmlns "http://www.w3.org/2000/svg"
:xmlns:xlink "http://www.w3.org/1999/xlink"}
[:circle {:id (str (:id data') "-background") :cx diameter :cy diameter :r (/ diameter 2) :style {:fill "white"}}]
[:text
{:text-anchor "middle"
:x (/ diameter 2)
:y (/ diameter 2)
:x diameter
:y diameter
:width (/ diameter 4)
:id (str (:id data') "-title")
:style {:font-family "sans-serif"
:font-weight "bold"}
:class "rsvggraph-value"} [:tspan (:label data) ": " (:quantity data)]]
(map #(draw-segment % diameter) (flatten-data data))]))