gauge.js

100% native and cool looking animated JavaScript/CoffeeScript gauge

Features

• No images, no external CSS - pure canvas
• No dependencies (jQuery is supported, but not required)
• Highly configurable
• Resolution independent
• Animated guage value changes (!)
• Works in all major browsers
• MIT License

Usage

var opts = {
  lines: 12, // The number of lines to draw
  angle: 7, // The length of each line
  lineWidth: 5, // The line thickness
  pointer: {
    length: 10, // The radius of the inner circle
    strokeWidth: 0, // The rotation offset
    color: '#000000' // Fill color
  },
  limitMax: 'false',   // If true, the pointer will not go past the end of the gauge
  colorStart: '0',   // Colors
  colorStop: '0',    // just experiment with them
  strokeColor: '0',   // to see which ones work best for you
  generateGradient: true
};
var target = document.getElementById('foo'); // your canvas element
var gauge = new Gauge(target).setOptions(opts); // create sexy gauge!
gauge.maxValue = 3000; // set max gauge value
gauge.animationSpeed = 3000; // set animation speed (32 is default value)
gauge.set(1500); // set actual value

The Gauge class handles drawing on canvas and starts the animation.

Advanced options

• Percentage color

  If you want to control how Gauge behavaes in relation to the displayed value you can use the Guage option called percentColors. To use it add following entry to the options:

  percentColors = [[0.0, "#a9d70b" ], [0.50, "#f9c802"], [1.0, "#ff0000"]];
  

  see working example at JSFiddle

jQuery plugin

Gauge.js does not require jQuery. Anyway, if you use jQuery you may use the following plugin:

$.fn.gauge = function(opts) {
  this.each(function() {
    var $this = $(this),
        data = $this.data();

    if (data.gauge) {
      data.gauge.stop();
      delete data.gauge;
    }
    if (opts !== false) {
      data.gauge = new Gauge(this).setOptions(opts);
    }
  });
  return this;
};

浏览器兼容

Gauge.js has been (not yet!) successfully tested in the following browsers:

• Chrome
• Safari 3.2+
• Firefox 3.5+
• IE 9
• Opera 10.6+
• Mobile Safari (iOS 3.2+)
• Android 2.3+