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Data Visualisation with D3 @byrichardpowell

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1. Why Visualise Data 2. Introducing D3 3. Rockin’ at data visualisation

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1 Why Visualise Data

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$15 Trillion

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money in taxhavens financial crisis bit.ly/1kEr3fV source: money in taxhavens

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charitable donations money in taxhavens financial crisis healthcare ending poverty bit.ly/1kEr3fV source: money in taxhavens money in taxhavens charitable donations

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infographics

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infographics bit.ly/1oOHSG8 source:

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Reason 1 Pictures not numbers

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Pedro Ops Engineer Developer

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RabbitMQ Load Memory

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RabbitMQ Load Memory

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Reason 2 Simplify complex problems

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Dom Web Designer

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Hours Cost Scope

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Hours Cost Scope Feature Requests 1 2

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Reason 3 Win arguments

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Old Visualisation

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Reason 4 Show your skills

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Summary

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2 Introducing D3

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!

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@mbostock

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jQuery D3 1. DOM selection & manipulation 2. Animations 3. Event Handling 4. AJAX 5. IE6+ 6. Plugins 1. DOM selection & manipulation 2. Animations 3. Event Handling 4. AJAX 5. IE8+ 6. Layouts & examples

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javascript

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It may feel familiar Concept 1

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jQuery D3 1. DOM selection & manipulation 2. Animations 3. Event Handling 4. AJAX 5. IE6+ 6. Plugins 1. DOM selection & manipulation 2. Animations 3. Event Handling 4. AJAX 5. IE8+ 6. Layouts & examples ! 7. Data manipulation & traversal 8. Maths 9. Behaviours

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javascript

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html javascript result

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Data driven documents Concept 2

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Layouts 1. Bundle 2. Chord 3. Cluster 4. Force 5. Hierarchy 6. Histogram 7. Pack 8. Partition 9. Pie 10.Stack 11.Tree 12.Treemap

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bl.ocks.org/mbostock/4060606

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bl.ocks.org/mbostock/4063318

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http://hughsk.io/colony/

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color.method.ac/

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It’s not a slideshow Concept 3

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hours days

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javascript

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Data First Concept 4

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SVG

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! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! <tref>! <tspan>! <use>! <view>

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CSS

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javascript 3 days = x pixels

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5 hours = y pixels javascript

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javascript 5 hours = y pixels

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javascript result

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Data Maths Elements Concept 5

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jsbin.com/komod/11/edit

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Summary

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3 Rockin’ Data Visualisation

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Be careful not to be evil Tip 1

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code.shutterstock.com/rickshaw/examples

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Write less code Tip 2

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javascript result

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“Above all else ! show the data” Edward Rolf Tufte, 1983

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bit.ly/183R6sT

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javascript result

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Show less Tip 3

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What is the value ! of your data?

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patterns?

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patterns can be hidden before after

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patterns can be hidden

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numbers?

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comparisons?

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Data is your second user.! Understand it.! Bend to its flexibility. Tip 4

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Avoiding Mistakes

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javascript console

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javascript console

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Fear data you don’t control Tip 4

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10:00 10:02 10:04 30 minutes

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10:00 10:08 10:10 30 hours 10:02 10:04 10:06 10:00 10:08 10:10 10:02 10:04 10:06 10:00 10:08 10:10 10:02 10:04 10:0610:00 10:08 10:10 10:02 10:04 10:0610:00 10:08 10:10 10:02 10:04 10:06 10:00 10:08 10:10 10:02 10:04 10:06 10:00 10:08 10:10 10:02 10:04 10:06

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30 hours 10:00 12:00 14:00

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javascript

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Don’t hard code Tip 5

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Summary

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@serverdensity @byrichardpowell Monitor servers & websites Configure Alerts Amazon, Rackspace Google Cloud Custom dashboards