Keming Labs

Kevin Lynagh 2012 July 20OSCON@lynaghk

Declarative web data visualization using ClojureScript

Friday, July 20, 12

Agenda

Friday, July 20, 12

Agenda

?1WhatVisualization

is

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Agenda

2doin’ itInternetson the

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Agenda

3Examplean

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Agenda

4Why

(not)

ClojureFriday, July 20, 12

Agenda

0 Talk

Anti-

Techideas

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Friday, July 20, 12

?1WhatVisualization

is

Friday, July 20, 12

Bioinformatics

Friday, July 20, 12

Wind energy

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Doc & patient,meet

DataFriday, July 20, 12

Friday, July 20, 12

Friday, July 20, 12

(didn’t make this, just ♥ it)

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?Whathave in

common do these things

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Data

VisualFriday, July 20, 12

0 25 50 75 100

Data: [17, 26, 53, 96]

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0

5

10

15

20

0 3 6 9 12 15

Data: [[1, 2] [3, 4] [5, 5] [6, 8] [8, 13] [9, 16] [11, 18]]

Friday, July 20, 12

Agenda

2doin’ itInternetson the

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D3: Data Driven Documents (2011)Mike Bostock Vadim OgievetskyJeffrey Heer

+

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D3 (JavaScript)

DOM

d3.select("body").selectAll("div")  .data([17, 26, 53, 96])  .enter().append("div")  .style("width", function(d){d+"px";});

Friday, July 20, 12

Awesome Declarative

Familiar representationHTML, CSS, SVG; dev toolsNo reinvented wheels

Easy to think, exploreOptimizable

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Awesomer Clojure(Script)

Rich data structuresNamespacesDeliberate state/mutation

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ClojurePhilosophy

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Treat yourlike Datadata

It is better to have 100 functions operate on one data structure than 10 functions on 10 data structures.

Alan Perlis

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D3 (JavaScript)d3.select("body").selectAll("div")  .data([17, 26, 53, 96])  .enter().append("div")  .style("width", function(d){d+"px";});

Friday, July 20, 12

D3 (JavaScript)d3.select("body").selectAll("div")  .data([17, 26, 53, 96])  .enter().append("div")  .style("width", function(d){d+"px";});

Friday, July 20, 12

D3 (JavaScript)d3.select("body").selectAll("div")  .data([17, 26, 53, 96])  .enter().append("div")  .style("width", function(d){d+"px";});

Can we do better?Friday, July 20, 12

Agenda

3Examplean

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Friday, July 20, 12

Friday, July 20, 12

[{:flight-no 2, :price 106, :carrier "Alaska" :depart 16.91, :arrive 21.42}

{:flight-no 1, :price 190, :carrier "United" :depart 6.20, :arrive 10.87}

{:flight-no 5, :price 213, :carrier "United" :depart 4.73, :arrive 9.48} ... ]

Start with your data

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Friday, July 20, 12

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(unify! "#chart" flight-data (fn [{:keys [price carrier depart arrive]} idx] [:div.row [:button.price (str "$" price)] [:div.flight {:style {:left (time-scale depart) :width (time-scale (- arrive depart))} :carrier carrier} [:span carrier]]]))

Friday, July 20, 12

(unify! "#chart" flight-data (fn [{:keys [price carrier depart arrive]} idx] [:div.row [:button.price (str "$" price)] [:div.flight {:style {:left (time-scale depart) :width (time-scale (- arrive depart))} :carrier carrier} [:span carrier]]]))

Friday, July 20, 12

(unify! "#chart" flight-data (fn [{:keys [price carrier depart arrive]} idx] [:div.row [:button.price (str "$" price)] [:div.flight {:style {:left (time-scale depart) :width (time-scale (- arrive depart))} :carrier carrier} [:span carrier]]]))

Friday, July 20, 12

(unify! "#chart" flight-data (fn [{:keys [price carrier depart arrive]} idx] [:div.row [:button.price (str "$" price)] [:div.flight {:style {:left (time-scale depart) :width (time-scale (- arrive depart))} :carrier carrier} [:span carrier]]]))

Friday, July 20, 12

(unify! "#chart" flight-data (fn [{:keys [price carrier depart arrive]} idx] [:div.row [:button.price (str "$" price)] [:div.flight {:style {:left (time-scale depart) :width (time-scale (- arrive depart))} :carrier carrier} [:span carrier]]]))

(let [time-scale (scale/linear :domain [0 24] :range :percent)]

(time-scale 0) ;=> “0%” (time-scale 12) ;=> “50%” (time-scale 24) ;=> “100%”)

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(unify! "#chart" flight-data (fn [{:keys [price carrier depart arrive]} idx] [:div.row [:button.price (str "$" price)] [:div.flight {:style {:left (time-scale depart) :width (time-scale (- arrive depart))} :carrier carrier} [:span carrier]]]))

Friday, July 20, 12

(unify! "#chart" flight-data (fn [{:keys [price carrier depart arrive]} idx] [:div.row [:button.price (str "$" price)] [:div.flight {:style {:left (time-scale depart) :width (time-scale (- arrive depart))} :carrier carrier} [:span carrier]]]))

Friday, July 20, 12

(unify! "#chart" flight-data (fn [{:keys [price carrier depart arrive]} idx] [:div.row [:button.price (str "$" price)] [:div.flight {:style {:left (time-scale depart) :width (time-scale (- arrive depart))} :carrier carrier} [:span carrier]]]))

Friday, July 20, 12

(unify! "#chart" flight-data (fn [{:keys [price carrier depart arrive]} idx] [:div.row [:button.price (str "$" price)] [:div.flight {:style {:left (time-scale depart) :width (time-scale (- arrive depart))} :carrier carrier} [:span carrier]]]))

Friday, July 20, 12

(unify! "#chart" flight-data (fn [{:keys [price carrier depart arrive]}] [:div.row [:button.price (str "$" price)] [:div.flight {:style {:left (time-scale depart) :width (time-scale (- arrive depart))} :carrier carrier} [:span carrier]]]))

Friday, July 20, 12

(map flight-data (fn [{:keys [price carrier depart arrive]}] [:div.row [:button.price (str "$" price)] [:div.flight {:style {:left (time-scale depart) :width (time-scale (- arrive depart))} :carrier carrier} [:span carrier]]]))

Friday, July 20, 12

(map flight-data (fn [{:keys [price carrier depart arrive]}] [:div.row [:button.price (str "$" price)] [:div.flight {:style {:left (time-scale depart) :width (time-scale (- arrive depart))} :carrier carrier} [:span carrier]]]))

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C2http://keminglabs.com/c2http://github.com/lynaghk/c2

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Advantagesof the

dataapproach

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Declarative

(fn [{:keys [price carrier depart arrive]}] [:div.row [:button.price (str "$" price)] [:div.flight {:style {:left (time-scale depart) :width (time-scale (- arrive depart))} :carrier carrier} [:span carrier]]])

Friday, July 20, 12

Declarative

(fn [{:keys [price carrier depart arrive]}] [:div.row [:button.price (str "$" price)] [:div.flight {:style (flight-style depart arrive)

:carrier carrier} [:span carrier]]])

Friday, July 20, 12

Declarative

(fn [{:keys [price carrier depart arrive]}] [:div.row [:button.price (str "$" price)] [:div.flight {:style (merge {:background-color "blue"} (flight-style depart arrive)) :carrier carrier} [:span carrier]]])

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Decoupled2) rendering1) construction

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Agenda

4Why

(not)

ClojureFriday, July 20, 12

Why Clojure

SaneOpinionated

&Friday, July 20, 12

Why Clojure

Runtimes:JVMCLR

JavaScript

Lua CFriday, July 20, 12

NotClojure

Friday, July 20, 12

Why not Clojure

WTFis Clojure?

Friday, July 20, 12

Why not Clojure

Clojure is the #23 most popular language on GitHub

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Why not Clojure

Assembly is the #18 most popular language on GitHub

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Why not Clojure

900+ forks

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Friday, July 20, 12

Keming Labs

Kevin Lynagh@lynaghk

Friday, July 20, 12