fill-colorcoded-bar

Progressively fill a colorcoded-bar based on an async data source.

Screencast

This shows two bars rendering the same data, using different strategies.

Example

var fill = require('fill-colorcoded-bar');
var Bar = require('colorcoded-bar');
var raf = require('raf');

var canvas = document.createElement('canvas');
document.body.appendChild(canvas);
var bar = new Bar;

var status = fill(bar, {
  strategy: 'topdown',
  length: 1000
}, function(i, cb){
  setTimeout(function(){
    cb(null, 'rgba(1, 1, 1, ' + Math.random() + ')');
  }, Math.random() * 300);
});

(function draw(){
  bar.render({ width: 100, height: 600, canvas: canvas });
  if (status.fetching) raf(draw);
})();

Installation

$ npm install fill-colorcoded-bar

API

fill(bar[, opts], fetch)

Fill colorcoded-bar bar based on function fetch which is expected to take (i, callback) and call callback with (null, color).

Options:

• strategy choose the strategy:
  • "topdown": render top to bottom
  • "refine": progressively refine the bar
• length: total data length, required by the refine strategy
• concurrency: concurrency when calling fetch. defaults to 10

Returns an EventEmitter that will emit "done" when done and has a property .fetching that becomes false once everything is done.

License

MIT