pruncalc/ts/mat.ts

import * as Plot from '@observablehq/plot';
import {cachedFetchJSON} from './cache';

const tickerSelect = document.querySelector('select#ticker') as HTMLSelectElement;
const charts = document.querySelector('#charts')!;

(async function () {
	const materials: Material[] = await fetch('https://rest.fnar.net/material/allmaterials').then((r) => r.json());
	const selected = document.location.hash.substring(1);
	for (const mat of materials.sort((a, b) => a.Ticker.localeCompare(b.Ticker))) {
		const option = document.createElement('option');
		option.value = mat.Ticker;
		option.textContent = `${mat.Ticker} ${mat.Name}`;
		if (mat.Ticker === selected)
			option.selected = true;
		tickerSelect.appendChild(option);
	}
	if (selected)
		render();
})();

tickerSelect.addEventListener('change', render);
	
async function render() {
	charts.innerHTML = '';
	renderPriceChart(tickerSelect.value, 'IC1');
}

async function renderPriceChart(ticker: string, cx: string) {
	const cxpc: PriceChartPoint[] = await cachedFetchJSON(`https://rest.fnar.net/exchange/cxpc/${ticker}.${cx}`);
	const filtered = cxpc.filter((p) => p.Interval === 'HOUR_TWELVE').map((p) => ({
		...p,
		Date: new Date(p.DateEpochMs)
	}));
	const plot = Plot.plot({
		inset: 6,
		width: 928,
		grid: true,
		y: {label: ticker},
		color: {domain: [-1, 0, 1], range: ['#e41a1c', '#000000', '#4daf4a']},
		marks: [
			Plot.lineY(filtered, {
				x: 'Date',
				y: (p) => p.Volume / p.Traded,
			}),
			Plot.ruleX(filtered, {
				x: 'Date',
				y1: 'Low',
				y2: 'High'
			}),
			/*
			Plot.ruleX(filtered, {
				x: 'Date',
				y: 'Traded',
				// stroke: (d) => Math.sign(d.Close - d.Open),
				// strokeWidth: 4,
				// strokeLinecap: 'round'
			})
			*/
			Plot.crosshairX(filtered, {
				x: 'Date',
				y: (p) => p.Traded / p.Volume,
				tip: true,
			})
		]
	})
	charts.appendChild(plot);
}

interface Material {
	Ticker: string;
	Name: string;
}

interface PriceChartPoint {
	Interval: 'MINUTE_FIVE' | 'MINUTE_FIFTEEN' | 'MINUTE_THIRTY' | 'HOUR_ONE' | 'HOUR_TWO' | 'HOUR_FOUR' | 'HOUR_SIX' | 'HOUR_TWELVE' | 'DAY_ONE' | 'DAY_THREE';
	DateEpochMs: number;
	High: number;
	Low: number;
	Volume: number;
	Traded: number;
}