Generate a bar graph from a row of tabular data in the terminal

node-drawille-bar-graph.js

const Canvas = require("./");
const canvas = new Canvas();
c = canvas.getContext("2d");

const ROWDATA = [213, 398, 12, 334, 102, 499, 60, 230, 222];

function draw() {
  let cols = 6;
  let rows = 10;

  c.clearRect(0, 0, canvas.width, canvas.height);
  c.save();

  for (var i = 0; i < ROWDATA.length; i++) {
    let colWidth = canvas.width / ROWDATA.length;
    let colPadding = (canvas.width / ROWDATA.length) * parseFloat(0.2);

    let xScale = 500;

    c.beginPath();
    c.fillRect(
      colWidth * i + colPadding,
      canvas.height,
      colWidth - colPadding * 2,
      -((xScale - ROWDATA[i]) / xScale) * (canvas.height - 20)
    );
    c.stroke();
  }

  c.strokeRect(0, 0, canvas.width - 1, canvas.height);
  process.stdout.write(c.toString());
}

draw();

Messing around with node-drawille and node-drawille-canvas API.

Assuming an array of integers is passed, along with the scale, a bar graph will be generated.

Ref: https://github.com/madbence/node-drawille-canvas