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Merge pull request #97 from FormidableLabs/livechart
Add "live" chart to homepage
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import React from "react"; | ||
import { last, mean } from "lodash"; | ||
import LiveChart from "./livechart"; | ||
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export default class DemoLiveChart extends React.Component { | ||
constructor(props) { | ||
super(props); | ||
this.period = 2000; | ||
this.domain = [54.6, 55.25]; | ||
this.maxPoints = 30; | ||
this.state = { | ||
data: this.getInitialData() | ||
}; | ||
} | ||
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nextPoint(previous = null) { | ||
const [low, high] = this.domain; | ||
const newPoint = low + Math.random() * (high - low); | ||
return previous ? mean([previous, newPoint]) : newPoint; | ||
} | ||
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getInitialData() { | ||
return [ | ||
{x: 0, y: this.domain[0] + 0.05}, | ||
{x: 1, y: this.domain[0] + 0.15} | ||
]; | ||
} | ||
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getNewData() { | ||
const data = this.state.data; | ||
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if (data.length !== this.maxPoints) { | ||
// add one | ||
const lastPoint = last(data); | ||
data.push( | ||
{y: this.nextPoint(lastPoint.y), x: lastPoint.x + 1} | ||
); | ||
return data; | ||
} else { | ||
return this.getInitialData(); | ||
} | ||
} | ||
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componentDidMount() { | ||
this.setStateInterval = setInterval(() => { | ||
this.setState({ // eslint-disable-line react/no-did-mount-set-state | ||
data: this.getNewData() | ||
}); | ||
}, this.period); | ||
} | ||
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componentWillUnmount() { | ||
clearInterval(this.setStateInterval); | ||
} | ||
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getStyles() { | ||
return { | ||
parent: { | ||
display: "block", | ||
boxSizing: "border-box", | ||
margin: "0 auto", | ||
padding: 0, | ||
width: "auto", | ||
height: "100%", | ||
maxHeight: "280px" | ||
} | ||
}; | ||
} | ||
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render() { | ||
const styles = this.getStyles(); | ||
return ( | ||
<svg | ||
viewBox="0 0 450 350" | ||
className="fancyBorder" | ||
style={styles.parent} | ||
> | ||
<LiveChart | ||
data={this.state.data} | ||
period={this.period} | ||
domain={this.domain} | ||
/> | ||
</svg> | ||
); | ||
} | ||
} |
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import React from "react"; | ||
import { round } from "lodash"; | ||
import { VictoryAxis, VictoryChart, VictoryLine, VictoryScatter } from "victory-chart"; | ||
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const leftPad = (str, len, ch) => { | ||
str = String(str); | ||
let i = -1; | ||
if (!ch && ch !== 0) { | ||
ch = " "; | ||
} | ||
len -= str.length; | ||
while (++i < len) { | ||
str = ch + str; | ||
} | ||
return str; | ||
}; | ||
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const start = Date.now(); | ||
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const makeDate = (period, count) => { | ||
const date = new Date(start + count * period); | ||
const hours = leftPad(date.getHours(), 2, 0); | ||
const minutes = leftPad(date.getMinutes(), 2, 0); | ||
const seconds = leftPad(date.getSeconds(), 2, 0); | ||
return `${hours}:${minutes}:${seconds}`; | ||
}; | ||
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const LiveChart = ({data, period, domain}) => ( | ||
<VictoryChart | ||
animate={{ duration: 1000 }} | ||
padding={{ | ||
left: 80, | ||
right: 50, | ||
top: 20, | ||
bottom: 30 | ||
}} | ||
> | ||
<VictoryAxis | ||
tickFormat={makeDate.bind(null, period)} | ||
tickCount={3} | ||
style={{ | ||
ticks: {stroke: "black", strokeWidth: 3} | ||
}} | ||
/> | ||
<VictoryAxis dependentAxis | ||
label="Price" | ||
tickCount={4} | ||
tickFormat={(y) => round(y, 2)} | ||
domain={domain} | ||
style={{ | ||
axisLabel: { | ||
padding: 50 | ||
}, | ||
ticks: {stroke: "black", strokeWidth: 3} | ||
}} | ||
/> | ||
<VictoryLine | ||
data={data} | ||
interpolation="monotoneX" | ||
style={{ | ||
data: { strokeWidth: 1 } | ||
}} | ||
/> | ||
<VictoryScatter | ||
data={data} | ||
size={5} | ||
style={{ | ||
data: { | ||
fill: "black", | ||
stroke: "white", | ||
strokeWidth: 3 | ||
} | ||
}} | ||
/> | ||
</VictoryChart> | ||
); | ||
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export default LiveChart; |