indicator-supply-demand-zones
Supply/Demand zones indicator, based on the TradingView indicator by frozon
This is almost a direct JS port of the TradingView code, but with the added modification that the rectangles are extended to the right until they "hit the price" [or, extends off to the right another 100 periods]. By default we have also changed the 5-period buffer on the left, to zero.
Installation
npm i indicator-supply-demand-zonesUsage
Minimal test:
let candles = generateFakeCandles(1000); //[{high, low}, ... ]
// Settings for finding pivot highs and lows
let timePadding = 0;
let pivotHighSettings = { leftLen: 2, rightLen: 1 };
let pivotLowSettings = { leftLen: 2, rightLen: 1 };
// Use the function
let zones = require('indicator-supply-demand-zones').supplyAndDemand(candles, pivotHighSettings, pivotLowSettings, timePadding);
// Log the results
console.log("Demand Zones:", zones.demandZones);
console.log("Supply Zones:", zones.supplyZones);
// Demand Zones: [
// {
// left: 86, //units = candle index
// top: 0.7282760110660691, //units = price
// right: 101,
// bottom: -0.326668655917951
// },
// {
// left: 136,
// top: 0.04575073534033857,
// right: 151,
// bottom: -0.3950954198293477
// },
// ...
// ]
// Supply Zones: [
// {
// left: 14,
// top: 77.21751270416024,
// right: 29,
// bottom: 81.17430799649048
// },
// {
// left: 410,
// top: 1.792492492359312,
// right: 425,
// bottom: 2.7756838024305597
// }
// ]Example with chart:
var {drawChartForCandles,saveChartForCandles} = require('ohlc-chart-simple');
var candles = require('jsonfile-compressed-brotli').readFileSync('./AAPL.json').slice(128);
//candles format [{open, high, low, close, volume}]
var sdData = require('indicator-supply-demand-zones').supplyAndDemand(candles);
var RECTS = []; //{minPrice,maxPrice,startIndex,endIndex,color,filled,thickness}
sdData.demandZones.map(function(dz){
RECTS.push({
minPrice: dz.bottom,
maxPrice: dz.top,
startIndex: dz.left,
endIndex: dz.right,
color: [0,255,0],
filled: false,
thickness:1
});
});
sdData.supplyZones.map(function(sz){
RECTS.push({
minPrice: sz.bottom,
maxPrice: sz.top,
startIndex: sz.left,
endIndex: sz.right,
color: [255,0,0],
filled: false,
thickness:1
});
});
var config = {
w: Math.floor(1024/2),
h: Math.floor(700/2),
profileBucketsTotal: 64,
profileBucketsWidth: 16,
volumeBarsHeight: 64,
bgColor: [255,255,255],
rects: RECTS,
kdePrices: candles.map(c=>[c.low, 1]), //[value, weight]
kdeBandwidthPercent: 1.00,
kdeIsGaussian: true, //false == kernel is triangular
kdeColor: [0,0,255],
skipDrawOhlcBars: false,
skipDrawIndicators: false,
skipDrawLegend: false,
expandLegendText: false,
expandTitle: false,
expandPrice: false,
skipDrawDate: true,
skipDrawPrice: false,
skipDrawPriceBars: false,
title: "AAPL",
filename: "./candlestick-chart.png",
}
saveChartForCandles(candles, config);Result
