blessed-contrib/lib/widget/gauge-list.js

Build dashboards (or any other application) using ascii/ansi art and javascript.

'use strict';
var blessed = require('blessed')
  , Node = blessed.Node
  , Canvas = require('./canvas');

function GaugeList(options) {
  if (!(this instanceof Node)) {
    return new GaugeList(options);
  }

  var self = this;

  options = options || {};
  self.options = options;
  self.options.stroke = options.stroke || 'magenta';
  self.options.fill = options.fill || 'white';
  self.options.data = options.data || [];
  self.options.showLabel = options.showLabel !== false;
  self.options.gaugeSpacing = options.gaugeSpacing || 0;
  self.options.gaugeHeight = options.gaugeHeight || 1;

  Canvas.call(this, options, require('ansi-term'));

  this.on('attach', function() {
    var gauges = this.gauges = self.options.gauges;
    this.setGauges(gauges);
  });

}

GaugeList.prototype = Object.create(Canvas.prototype);

GaugeList.prototype.calcSize = function() {
  this.canvasSize = {width: this.width-2, height: this.height};
};

GaugeList.prototype.type = 'gauge';

GaugeList.prototype.setData = function() {
};

GaugeList.prototype.setGauges = function(gauges) {

  if (!this.ctx) {
    throw 'error: canvas context does not exist. setData() for gauges must be called after the gauge has been added to the screen via screen.append()';
  }

  var c = this.ctx;
  c.clearRect(0, 0, this.canvasSize.width, this.canvasSize.height);

  for (var i=0; i<gauges.length; i++) {
    this.setSingleGauge(gauges[i], i);
  }

};

GaugeList.prototype.setSingleGauge = function(gauge, offset) {

  var colors = ['green','magenta','cyan','red','blue'];
  var stack = gauge.stack;

  var c = this.ctx;
  var leftStart = 3;
  var textLeft = 5;

  c.strokeStyle='normal';
  c.fillStyle='white';
  c.fillText(offset.toString(), 0, offset*(this.options.gaugeHeight+this.options.gaugeSpacing));

  for (var i = 0; i < stack.length; i++) {
    var currentStack = stack[i];

    var percent;
    if (typeof(currentStack) == typeof({})){
      percent = currentStack.percent;
    } else {
      percent = currentStack;
    }

    c.strokeStyle = currentStack.stroke || colors[(i%colors.length)]; // use specified or choose from the array of colors
    c.fillStyle = this.options.fill;//'white'

    textLeft = 5;

    var width = percent/100*(this.canvasSize.width-5);

    c.fillRect(leftStart, offset*(this.options.gaugeHeight+this.options.gaugeSpacing), width, this.options.gaugeHeight-1);

    textLeft = (width / 2) - 1;
    // if (textLeft)
    var textX = leftStart+textLeft;

    if ((leftStart+width)<textX) {
      c.strokeStyle = 'normal';
    }
    if (gauge.showLabel) c.fillText(percent+'%', textX, 3);

    leftStart += width;
  }
};

GaugeList.prototype.getOptionsPrototype = function() {
  return {percent: 10};
};

module.exports = GaugeList;