manifold/web/components/contract-prob-graph.tsx

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import { DatumValue } from '@nivo/core'
import { ResponsiveLine } from '@nivo/line'
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import dayjs from 'dayjs'
import { getProbability } from '../../common/calculate'
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import { useBets } from '../hooks/use-bets'
import { useWindowSize } from '../hooks/use-window-size'
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import { withoutAnteBets } from '../lib/firebase/bets'
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import { Contract } from '../lib/firebase/contracts'
export function ContractProbGraph(props: { contract: Contract }) {
const { contract } = props
const { id, phantomShares, resolutionTime } = contract
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let bets = useBets(id) ?? []
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bets = withoutAnteBets(contract, bets)
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const startProb = getProbability(phantomShares)
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const times = [
contract.createdTime,
...bets.map((bet) => bet.createdTime),
].map((time) => new Date(time))
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const probs = [startProb, ...bets.map((bet) => bet.probAfter)]
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const latestTime = dayjs(resolutionTime ? resolutionTime : Date.now())
if (!resolutionTime) {
// Add a fake datapoint in future so the line continues horizontally
// to the right.
times.push(latestTime.add(1, 'month').toDate())
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probs.push(probs[probs.length - 1])
}
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const points = probs.map((prob, i) => ({ x: times[i], y: prob * 100 }))
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const data = [{ id: 'Yes', data: points, color: '#11b981' }]
const yTickValues = [0, 25, 50, 75, 100]
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const { width } = useWindowSize()
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const numXTickValues = !width || width < 800 ? 2 : 5
const hoursAgo = latestTime.subtract(5, 'hours')
const startDate = dayjs(times[0]).isBefore(hoursAgo)
? times[0]
: hoursAgo.toDate()
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const lessThanAWeek = dayjs(startDate).add(1, 'week').isAfter(latestTime)
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return (
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<div
className="w-full"
style={{ height: !width || width >= 800 ? 400 : 250 }}
>
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<ResponsiveLine
data={data}
yScale={{ min: 0, max: 100, type: 'linear' }}
yFormat={formatPercent}
gridYValues={yTickValues}
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axisLeft={{
tickValues: yTickValues,
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format: formatPercent,
}}
xScale={{
type: 'time',
min: startDate,
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max: latestTime.toDate(),
}}
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xFormat={(d) => formatTime(+d.valueOf(), lessThanAWeek)}
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axisBottom={{
tickValues: numXTickValues,
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format: (time) => formatTime(+time, lessThanAWeek),
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}}
colors={{ datum: 'color' }}
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pointSize={10}
pointBorderWidth={1}
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pointBorderColor="#fff"
enableSlices="x"
enableGridX={!!width && width >= 800}
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enableArea
margin={{ top: 20, right: 28, bottom: 22, left: 40 }}
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/>
</div>
)
}
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function formatPercent(y: DatumValue) {
return `${Math.round(+y.toString())}%`
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}
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function formatTime(time: number, includeTime: boolean) {
const d = dayjs(time)
if (d.isSame(Date.now(), 'day')) return d.format('ha')
if (includeTime) return dayjs(time).format('MMM D, ha')
return dayjs(time).format('MMM D')
}