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Add Bar Chart #5

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be39952
Add bar chart layer with default and overlay modes
0xChandi Feb 25, 2026
78ce45c
Fix bar chart rendering in candle mode, consolidate demo pages
0xChandi Feb 25, 2026
2aa3f21
Reduce right padding when badge/grid are off
0xChandi Feb 25, 2026
fc8e8b4
Dynamic right-side buffer based on badge visibility
0xChandi Feb 25, 2026
3a7cf34
Merge pull request #1 from 0xChandi/fix/right-padding
0xChandi Feb 25, 2026
5d1cfe8
Merge branch 'main' into feat/bar-chart
0xChandi Feb 25, 2026
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107 changes: 100 additions & 7 deletions dev/demo.tsx
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
import React, { useState, useEffect, useRef, useCallback } from 'react'
import { createRoot } from 'react-dom/client'
import { Liveline } from 'liveline'
import type { LivelinePoint, CandlePoint } from 'liveline'
import type { LivelinePoint, CandlePoint, BarPoint } from 'liveline'

// --- Data generators ---

Expand Down Expand Up @@ -40,6 +40,42 @@ function aggregateCandles(ticks: LivelinePoint[], width: number): { candles: Can
return { candles, live: { time: slot, open: o, high: h, low: l, close: c } }
}

/** Generate initial volume bars from seed data */
function generateBars(data: LivelinePoint[], bucketSecs: number): BarPoint[] {
if (data.length === 0) return []
const bars: BarPoint[] = []
const startTime = Math.floor(data[0].time / bucketSecs) * bucketSecs
let bucketStart = startTime
let bucketVolume = 0
let prevValue = data[0].value
for (const pt of data) {
while (pt.time >= bucketStart + bucketSecs) {
if (bucketVolume > 0) bars.push({ time: bucketStart, value: bucketVolume })
bucketStart += bucketSecs
bucketVolume = 0
}
const change = Math.abs(pt.value - prevValue)
bucketVolume += 10 + change * 20 + Math.random() * 5
prevValue = pt.value
}
if (bucketVolume > 0) bars.push({ time: bucketStart, value: bucketVolume })
return bars
}

/** Incrementally update bars with a new data point — only touches the last bucket */
function addTickToBars(bars: BarPoint[], pt: LivelinePoint, prevValue: number, bucketSecs: number): BarPoint[] {
const bucketStart = Math.floor(pt.time / bucketSecs) * bucketSecs
const change = Math.abs(pt.value - prevValue)
const volume = 10 + change * 20 + Math.random() * 5
if (bars.length === 0 || bars[bars.length - 1].time < bucketStart) {
return [...bars, { time: bucketStart, value: volume }]
}
const updated = bars.slice()
const last = updated[updated.length - 1]
updated[updated.length - 1] = { time: last.time, value: last.value + volume }
return updated
}

// --- Constants ---

const TIME_WINDOWS = [
Expand Down Expand Up @@ -88,10 +124,15 @@ function Demo() {
const [windowSecs, setWindowSecs] = useState(30)
const [theme, setTheme] = useState<'dark' | 'light'>('dark')
const [grid, setGrid] = useState(true)
const [badge, setBadge] = useState(true)
const [scrub, setScrub] = useState(true)

const [volatility, setVolatility] = useState<Volatility>('normal')
const [tickRate, setTickRate] = useState(300)
const [bars, setBars] = useState<BarPoint[]>([])
const [barMode, setBarMode] = useState<'default' | 'overlay'>('default')
const [barLabels, setBarLabels] = useState(false)
const barBucketSecs = 2

const [chartType, setChartType] = useState<'line' | 'candle'>('candle')
const [candleSecs, setCandleSecs] = useState(2)
Expand Down Expand Up @@ -162,10 +203,12 @@ function Demo() {
setCandles(agg.candles)
setLiveCandle(agg.live)
liveCandleRef.current = agg.live ? { ...agg.live } : null
setBars(generateBars(seed, barBucketSecs))

intervalRef.current = window.setInterval(() => {
const now = Date.now() / 1000
const pt = generatePoint(lastValueRef.current, now, volatilityRef.current, startValueRef.current)
const prevVal = lastValueRef.current
const pt = generatePoint(prevVal, now, volatilityRef.current, startValueRef.current)
lastValueRef.current = pt.value
setValue(pt.value)
setData(prev => {
Expand All @@ -175,14 +218,15 @@ function Demo() {
return trimmed
})
tickAndAggregate(pt)
setBars(prev => addTickToBars(prev, pt, prevVal, barBucketSecs))
}, tickRate)
}, [tickRate])

useEffect(() => {
if (scenario === 'loading') {
setLoading(true)
setData([]); dataRef.current = []
setCandles([]); setLiveCandle(null); liveCandleRef.current = null
setCandles([]); setLiveCandle(null); liveCandleRef.current = null; setBars([])
clearInterval(intervalRef.current)
const timer = setTimeout(() => setScenario('live'), 3000)
return () => clearTimeout(timer)
Expand All @@ -191,15 +235,15 @@ function Demo() {
if (scenario === 'loading-hold') {
setLoading(true)
setData([]); dataRef.current = []
setCandles([]); setLiveCandle(null); liveCandleRef.current = null
setCandles([]); setLiveCandle(null); liveCandleRef.current = null; setBars([])
clearInterval(intervalRef.current)
return
}

if (scenario === 'empty') {
setLoading(false)
setData([]); dataRef.current = []
setCandles([]); setLiveCandle(null); liveCandleRef.current = null
setCandles([]); setLiveCandle(null); liveCandleRef.current = null; setBars([])
clearInterval(intervalRef.current)
return
}
Expand All @@ -213,7 +257,8 @@ function Demo() {
clearInterval(intervalRef.current)
intervalRef.current = window.setInterval(() => {
const now = Date.now() / 1000
const pt = generatePoint(lastValueRef.current, now, volatilityRef.current, startValueRef.current)
const prevVal = lastValueRef.current
const pt = generatePoint(prevVal, now, volatilityRef.current, startValueRef.current)
lastValueRef.current = pt.value
setValue(pt.value)
setData(prev => {
Expand All @@ -223,6 +268,7 @@ function Demo() {
return trimmed
})
tickAndAggregate(pt)
setBars(prev => addTickToBars(prev, pt, prevVal, barBucketSecs))
}, tickRate)
return () => clearInterval(intervalRef.current)
}, [tickRate, scenario])
Expand Down Expand Up @@ -260,7 +306,7 @@ function Demo() {
}
// Force re-seed by cycling to loading
setData([]); dataRef.current = []
setCandles([]); setLiveCandle(null); liveCandleRef.current = null
setCandles([]); setLiveCandle(null); liveCandleRef.current = null; setBars([])
lastValueRef.current = preset === 'crypto' ? 65000 : 100
clearInterval(intervalRef.current)
setLoading(true)
Expand Down Expand Up @@ -347,6 +393,7 @@ function Demo() {
<Btn active={theme === 'light'} onClick={() => setTheme('light')}>Light</Btn>
<Sep />
<Toggle on={grid} onToggle={setGrid}>Grid</Toggle>
<Toggle on={badge} onToggle={setBadge}>Badge</Toggle>
<Toggle on={scrub} onToggle={setScrub}>Scrub</Toggle>
</Section>

Expand Down Expand Up @@ -379,6 +426,7 @@ function Demo() {
formatValue={preset === 'crypto' ? formatCrypto : undefined}
onModeChange={(mode) => setChartType(mode)}
grid={grid}
badge={badge}
scrub={scrub}
/>
</div>
Expand Down Expand Up @@ -421,13 +469,58 @@ function Demo() {
window={windowSecs}
formatValue={preset === 'crypto' ? formatCrypto : undefined}
grid={grid && size.w >= 200}
badge={badge && size.w >= 200}
scrub={scrub}
/>
</div>
</div>
))}
</div>

{/* Volume bars */}
<div style={{ display: 'flex', alignItems: 'center', gap: 8, marginTop: 24, marginBottom: 8 }}>
<p style={{ fontSize: 12, color: 'var(--fg-30)', margin: 0 }}>Volume bars</p>
<Btn active={barMode === 'default'} onClick={() => setBarMode('default')}>Default</Btn>
<Btn active={barMode === 'overlay'} onClick={() => setBarMode('overlay')}>Overlay</Btn>
<Sep />
<Toggle on={barLabels} onToggle={setBarLabels}>Labels</Toggle>
</div>
<div style={{
height: 320,
background: 'var(--fg-02)',
borderRadius: 12,
border: '1px solid var(--fg-06)',
padding: 8,
overflow: 'hidden',
}}>
<Liveline
mode="candle"
data={data}
value={value}
candles={candles}
candleWidth={candleSecs}
liveCandle={liveCandle ?? undefined}
lineMode={chartType === 'line'}
lineData={data}
lineValue={value}
loading={loading}
paused={paused}
theme={theme}
color={preset === 'crypto' ? '#f7931a' : undefined}
window={windowSecs}
windows={preset === 'crypto' ? CRYPTO_WINDOWS : undefined}
formatValue={preset === 'crypto' ? formatCrypto : undefined}
onModeChange={(mode) => setChartType(mode)}
grid={grid}
badge={badge}
scrub={scrub}
bars={bars}
barMode={barMode}
barWidth={barBucketSecs}
barLabels={barLabels}
/>
</div>

{/* Status bar */}
<div style={{
marginTop: 10,
Expand Down
96 changes: 92 additions & 4 deletions dev/main.tsx
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
import React, { useState, useEffect, useRef, useCallback } from 'react'
import { createRoot } from 'react-dom/client'
import { Liveline } from 'liveline'
import type { LivelinePoint, LivelineSeries } from 'liveline'
import type { LivelinePoint, LivelineSeries, BarPoint} from 'liveline'

// --- Data generators ---

Expand All @@ -19,6 +19,42 @@ function generatePoint(prev: number, time: number, volatility: Volatility): Live
return { time, value: prev + delta }
}

/** Generate initial volume bars from seed data */
function generateBars(data: LivelinePoint[], bucketSecs: number): BarPoint[] {
if (data.length === 0) return []
const bars: BarPoint[] = []
const startTime = Math.floor(data[0].time / bucketSecs) * bucketSecs
let bucketStart = startTime
let bucketVolume = 0
let prevValue = data[0].value
for (const pt of data) {
while (pt.time >= bucketStart + bucketSecs) {
if (bucketVolume > 0) bars.push({ time: bucketStart, value: bucketVolume })
bucketStart += bucketSecs
bucketVolume = 0
}
const change = Math.abs(pt.value - prevValue)
bucketVolume += 10 + change * 20 + Math.random() * 5
prevValue = pt.value
}
if (bucketVolume > 0) bars.push({ time: bucketStart, value: bucketVolume })
return bars
}

/** Incrementally update bars with a new data point — only touches the last bucket */
function addTickToBars(bars: BarPoint[], pt: LivelinePoint, prevValue: number, bucketSecs: number): BarPoint[] {
const bucketStart = Math.floor(pt.time / bucketSecs) * bucketSecs
const change = Math.abs(pt.value - prevValue)
const volume = 10 + change * 20 + Math.random() * 5
if (bars.length === 0 || bars[bars.length - 1].time < bucketStart) {
return [...bars, { time: bucketStart, value: volume }]
}
const updated = bars.slice()
const last = updated[updated.length - 1]
updated[updated.length - 1] = { time: last.time, value: last.value + volume }
return updated
}

// --- Constants ---

const TIME_WINDOWS = [
Expand Down Expand Up @@ -60,6 +96,10 @@ function Demo() {
const [scrub, setScrub] = useState(true)
const [exaggerate, setExaggerate] = useState(false)
const [theme, setTheme] = useState<'dark' | 'light'>('dark')
const [bars, setBars] = useState<BarPoint[]>([])
const [barMode, setBarMode] = useState<'default' | 'overlay'>('default')
const [barLabels, setBarLabels] = useState(false)
const barBucketSecs = 2
const [windowStyle, setWindowStyle] = useState<'default' | 'rounded' | 'text'>('default')
const [lineMode, setLineMode] = useState(true)

Expand All @@ -70,6 +110,7 @@ function Demo() {
const intervalRef = useRef<number>(0)
const volatilityRef = useRef(volatility)
volatilityRef.current = volatility
const lastValueRef = useRef(100)

const startLive = useCallback(() => {
clearInterval(intervalRef.current)
Expand All @@ -85,13 +126,18 @@ function Demo() {
}
setData(seed)
setValue(v)
lastValueRef.current = v
setBars(generateBars(seed, barBucketSecs))

intervalRef.current = window.setInterval(() => {
setData(prev => {
const now = Date.now() / 1000
const lastVal = prev.length > 0 ? prev[prev.length - 1].value : 100
const prevVal = lastValueRef.current
const pt = generatePoint(lastVal, now, volatilityRef.current)
lastValueRef.current = pt.value
setValue(pt.value)
setBars(b => addTickToBars(b, pt, prevVal, barBucketSecs))
const next = [...prev, pt]
return next.length > 500 ? next.slice(-500) : next
})
Expand All @@ -101,22 +147,22 @@ function Demo() {
useEffect(() => {
if (scenario === 'loading') {
setLoading(true)
setData([])
setData([]); setBars([])
clearInterval(intervalRef.current)
const timer = setTimeout(() => setScenario('live'), 3000)
return () => clearTimeout(timer)
}

if (scenario === 'loading-hold') {
setLoading(true)
setData([])
setData([]); setBars([])
clearInterval(intervalRef.current)
return
}

if (scenario === 'empty') {
setLoading(false)
setData([])
setData([]); setBars([])
clearInterval(intervalRef.current)
return
}
Expand All @@ -134,8 +180,11 @@ function Demo() {
setData(prev => {
const now = Date.now() / 1000
const lastVal = prev.length > 0 ? prev[prev.length - 1].value : 100
const prevVal = lastValueRef.current
const pt = generatePoint(lastVal, now, volatilityRef.current)
lastValueRef.current = pt.value
setValue(pt.value)
setBars(b => addTickToBars(b, pt, prevVal, barBucketSecs))
const next = [...prev, pt]
return next.length > 500 ? next.slice(-500) : next
})
Expand Down Expand Up @@ -325,6 +374,45 @@ function Demo() {
))}
</div>

{/* Volume bars */}
<div style={{ display: 'flex', alignItems: 'center', gap: 8, marginTop: 24, marginBottom: 8 }}>
<p style={{ fontSize: 12, color: 'var(--fg-30)', margin: 0 }}>Volume bars</p>
<Btn active={barMode === 'default'} onClick={() => setBarMode('default')}>Default</Btn>
<Btn active={barMode === 'overlay'} onClick={() => setBarMode('overlay')}>Overlay</Btn>
<Sep />
<Toggle on={barLabels} onToggle={setBarLabels}>Labels</Toggle>
</div>
<div style={{
height: 320,
background: 'var(--fg-02)',
borderRadius: 12,
border: '1px solid var(--fg-06)',
padding: 8,
overflow: 'hidden',
}}>
<Liveline
data={data}
value={value}
theme={theme}
window={windowSecs}
loading={loading}
paused={paused}
grid={grid}
scrub={scrub}
fill={fill}
badge={badge}
badgeVariant={badgeVariant}
momentum={momentum}
pulse={pulse}
windows={TIME_WINDOWS}
onWindowChange={setWindowSecs}
bars={bars}
barMode={barMode}
barWidth={barBucketSecs}
barLabels={barLabels}
/>
</div>

{/* Status bar */}
<div style={{
marginTop: 10,
Expand Down
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