React Native and D3 Workshop

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React Native, SVG, and D3 hswolff @hswolff

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Harry Wolff Senior UI Engineer @ MongoDB.com Blog @ hswolff.com Twitter @ hswolff GitHub @ hswolff

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What do I know about React Native?

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Chartbeat iOS http://blog.chartbeat.com/2016/04/07/say-hello-to-the-all-new-chartbeat-ios-app/

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React Native D3JS D3JS and React Native Project

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Exercise

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Exercise 1 Let’s install some prerequisites. https://facebook.github.io/react-native/docs/ getting-started.html Everything up to “Testing your React Native Installation” section.

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What is React Native?

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A framework for building native apps with React

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React Native is built on top of React

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How does this work?

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React Native …creates a bridge between JavaScript and Native Code (iOS / Android) …and handles passing information between the two environments More details: http://tadeuzagallo.com/ blog/react-native-bridge/

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How is React Native different than React?

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JavaScript Environment

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No DOM

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React Native Packager https://github.com/facebook/react- native/tree/master/packager

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npm friendly

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Exercise

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Exercise 1 1. You should have node, watchman, and either Xcode or Android Studio installed. 2. Install React Native CLI: npm install -g react- native-cli 3. react-native init ReactNativeAndD3Workshop 4. cd ReactNativeAndD3Workshop/ 5. react-native run-ios (or react-native run-android)

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Exercise 1

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What is SVG?

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SVG XML-based vector image format

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SVG • XML: markup language • Human and machine readable • Vector image: use of polygons to represent images • Can be resized without losing quality

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SVG Elements • Root element: SVG • Creates an SVG fragment, own viewport and coordinate system • Graphic elements: , , , , , , , , , ,

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Exercise

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Exercise 2 https://codepen.io/hswolff/pen/ZLpgzy

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SVG https://developer.mozilla.org/en-US/docs/Web/SVG/ Tutorial/Paths “Paths create complex shapes by combining multiple straight lines or curved lines” “The shape of a path element is deﬁned by one attribute: d.”

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SVG Create graphics using line commands Move to x 10, y 10 Horizontal line of 90 Vertical line of 90 Horizontal line of 10 Line to x 10, y 10

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SVG

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What is D3JS?

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“a JavaScript library for manipulating documents based on data” https://d3js.org/

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“D3 helps you bring data to life using HTML, SVG, and CSS.” https://d3js.org/

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https://d3js.org/

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D3 4.0 Now Modular

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d3-scale https://github.com/d3/d3-scale “Continuous scales map a continuous, quantitative input domain to a continuous output range.” Continuous Scales “Given a value from the domain, returns the corresponding value from the range.”

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d3-scale https://github.com/d3/d3-scale

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d3-scale https://github.com/d3/d3-scale “Time scales are a variant of linear scales that have a temporal domain: domain values are coerced to dates rather than numbers" Time Scales

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d3-scale https://github.com/d3/d3-scale

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d3-shape https://github.com/d3/d3-shape

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d3-shape https://github.com/d3/d3-shape “line generator can then be used to compute the d attribute of an SVG path element”

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d3-shape https://github.com/d3/d3-shape

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d3-shape https://github.com/d3/d3-shape

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Exercise

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Exercise 3 https://codepen.io/hswolff/pen/qRaGOE

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Exercise 3 Answer https://codepen.io/hswolff/pen/egdqbL

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How does D3JS work with React Native?

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ART https://github.com/sebmarkbage/art “ART is a retained mode vector drawing API”

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ART https://github.com/sebmarkbage/art

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ART https://github.com/sebmarkbage/art

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React ART https://github.com/reactjs/react-art “React ART is a JavaScript library for drawing vector graphics using React.” “It provides declarative and reactive bindings to the ART library.”

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React ART https://github.com/reactjs/react-art

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React Native ART https://github.com/facebook/react-native/tree/master/

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Exercise

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Exercise 4 Let’s get React Native ART working!

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Link ART https://facebook.github.io/react-native/docs/linking- libraries-ios.html#manual-linking

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Exercise 4 Link React Native ART: http://facebook.github.io/react- native/docs/linking-libraries-ios.html $ open node_modules/react-native/Libraries/ART $ react-native run-ios

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Exercise 4 Use the React Native ART Component

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Exercise 4

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Exercise 4

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Exercise 4

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Project

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index.ios.js js/ Page.js Graph.js Part 1: App structure

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index.ios.js js/ Page.js Graph.js ﬁxtures.js graph-utils.js Part 2: Graph

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index.ios.js js/ Page.js Graph.js ﬁxtures.js graph-utils.js Part 3: X Axis

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index.ios.js js/ Page.js Graph.js ﬁxtures.js graph-utils.js Part 4: Y Axis

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index.ios.js js/ Page.js Graph.js ﬁxtures.js graph-utils.js ControlButton.js Part 5: Buttons

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index.ios.js js/ Page.js Graph.js ﬁxtures.js graph-utils.js ControlButton.js Part 6: Animate!

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Full featured app

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Open Sourced https://github.com/hswolff/ BetterWeather

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Resources https://speakerdeck.com/hswolff/react-native- and-d3js https://d3js.org/ http://hswolff.com/blog/react-native-art-and-d3/ https://github.com/hswolff/BetterWeather

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React Native, SVG, and D3 hswolff @hswolff https://speakerdeck.com/hswolff/react-native-and-d3js