Finance

Specialist charts, a deep indicator set, and a session axis that removes market gaps — all on the same GPU pipeline.

Charts

import { addBollinger, addDepth, addDrawdown, addHeikinAshi, addRenko, addVolumeProfile } from "@photonviz/core";

plot.addCandlestick({ x, open, high, low, close }) and plot.addOhlc(...) are the primitives; the builders above compose them with a transform.

The session axis

Real markets have gaps — nights, weekends, holidays. Plotting against wall-clock time leaves dead space. ordinal-time plots bars at integer indices, so the gaps collapse, while the ticks still show calendar dates:

new Plot(el, { scales: { x: { type: "ordinal-time", times: epochMs } } });

Indicators

Pure array → array, each returning a Float64Array with a leading NaN warm-up run that the layers skip:

sma ema wma rollingStd bollinger rsi macd vwap trueRange atrstochastic keltner obv ichimoku adx superTrend fibRetracementscci mfi williamsR aroon donchian parabolicSar pivotPoints

Transforms

heikinAshi renko lineBreak pointAndFigure volumeProfile depthresampleOhlc(time, ohlc, bucketMs, volume?) drawdown(equity)

resampleOhlc rolls bars up to a coarser timeframe with buckets aligned to the epoch, skipping empty ones rather than filling them — which is what a market calendar wants.

Drawdown

The companion pane to an equity curve: how far below its running high-water mark the strategy sat, and the deepest stretch marked.

Linked panes

linkX([price, volume, rsi]) syncs pan, zoom and the crosshair across the stack.