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- /* global window, define, module */
- (function(global, factory) {
- var Gauge = factory(global);
- if(typeof define === "function" && define.amd) {
- // AMD support
- define(function() {return Gauge;});
- }else if(typeof module === "object" && module.exports) {
- // CommonJS support
- module.exports = Gauge;
- }else {
- // We are probably running in the browser
- global.Gauge = Gauge;
- }
- })(typeof window === "undefined" ? this : window, function(global, undefined) {
- var document = global.document,
- slice = Array.prototype.slice,
- requestAnimationFrame = (global.requestAnimationFrame ||
- global.mozRequestAnimationFrame ||
- global.webkitRequestAnimationFrame ||
- global.msRequestAnimationFrame ||
- function(cb) {
- return setTimeout(cb, 1000 / 60);
- });
- // EXPERIMENTAL!!
- /**
- * Simplistic animation function for animating the gauge. That's all!
- * Options are:
- * {
- * duration: 1, // In seconds
- * start: 0, // The start value
- * end: 100, // The end value
- * step: function, // REQUIRED! The step function that will be passed the value and does something
- * easing: function // The easing function. Default is easeInOutCubic
- * }
- */
- function Animation(options) {
- var duration = options.duration,
- currentIteration = 1,
- iterations = 60 * duration,
- start = options.start || 0,
- end = options.end,
- change = end - start,
- step = options.step,
- easing = options.easing || function easeInOutCubic(pos) {
- // https://github.com/danro/easing-js/blob/master/easing.js
- if ((pos/=0.5) < 1) return 0.5*Math.pow(pos,3);
- return 0.5 * (Math.pow((pos-2),3) + 2);
- };
- function animate() {
- var progress = currentIteration / iterations,
- value = change * easing(progress) + start;
- // console.log(progress + ", " + value);
- step(value, currentIteration);
- currentIteration += 1;
- if(progress < 1) {
- requestAnimationFrame(animate);
- }
- }
- // start!
- requestAnimationFrame(animate);
- }
- var Gauge = (function() {
- var SVG_NS = "http://www.w3.org/2000/svg";
- var GaugeDefaults = {
- centerX: 50,
- centerY: 50
- };
- var defaultOptions = {
- dialRadius: 40,
- dialStartAngle: 135,
- dialEndAngle: 45,
- value: 0,
- max: 100,
- min: 0,
- valueDialClass: "value",
- valueClass: "value-text",
- dialClass: "dial",
- gaugeClass: "gauge",
- showValue: true,
- gaugeColor: null,
- label: function(val) {return Math.round(val);}
- };
- function shallowCopy(/* source, ...targets*/) {
- var target = arguments[0], sources = slice.call(arguments, 1);
- sources.forEach(function(s) {
- for(var k in s) {
- if(s.hasOwnProperty(k)) {
- target[k] = s[k];
- }
- }
- });
- return target;
- }
- /**
- * A utility function to create SVG dom tree
- * @param {String} name The SVG element name
- * @param {Object} attrs The attributes as they appear in DOM e.g. stroke-width and not strokeWidth
- * @param {Array} children An array of children (can be created by this same function)
- * @return The SVG element
- */
- function svg(name, attrs, children) {
- var elem = document.createElementNS(SVG_NS, name);
- for(var attrName in attrs) {
- elem.setAttribute(attrName, attrs[attrName]);
- }
- if(children) {
- children.forEach(function(c) {
- elem.appendChild(c);
- });
- }
- return elem;
- }
- /**
- * Translates percentage value to angle. e.g. If gauge span angle is 180deg, then 50%
- * will be 90deg
- */
- function getAngle(percentage, gaugeSpanAngle) {
- return percentage * gaugeSpanAngle / 100;
- }
- function normalize(value, min, limit) {
- var val = Number(value);
- if(val > limit) return limit;
- if(val < min) return min;
- return val;
- }
- function getValueInPercentage(value, min, max) {
- var newMax = max - min, newVal = value - min;
- return 100 * newVal / newMax;
- // var absMin = Math.abs(min);
- // return 100 * (absMin + value) / (max + absMin);
- }
- /**
- * Gets cartesian co-ordinates for a specified radius and angle (in degrees)
- * @param cx {Number} The center x co-oriinate
- * @param cy {Number} The center y co-ordinate
- * @param radius {Number} The radius of the circle
- * @param angle {Number} The angle in degrees
- * @return An object with x,y co-ordinates
- */
- function getCartesian(cx, cy, radius, angle) {
- var rad = angle * Math.PI / 180;
- return {
- x: Math.round((cx + radius * Math.cos(rad)) * 1000) / 1000,
- y: Math.round((cy + radius * Math.sin(rad)) * 1000) / 1000
- };
- }
- // Returns start and end points for dial
- // i.e. starts at 135deg ends at 45deg with large arc flag
- // REMEMBER!! angle=0 starts on X axis and then increases clockwise
- function getDialCoords(radius, startAngle, endAngle) {
- var cx = GaugeDefaults.centerX,
- cy = GaugeDefaults.centerY;
- return {
- end: getCartesian(cx, cy, radius, endAngle),
- start: getCartesian(cx, cy, radius, startAngle)
- };
- }
- /**
- * Creates a Gauge object. This should be called without the 'new' operator. Various options
- * can be passed for the gauge:
- * {
- * dialStartAngle: The angle to start the dial. MUST be greater than dialEndAngle. Default 135deg
- * dialEndAngle: The angle to end the dial. Default 45deg
- * radius: The gauge's radius. Default 400
- * max: The maximum value of the gauge. Default 100
- * value: The starting value of the gauge. Default 0
- * label: The function on how to render the center label (Should return a value)
- * }
- * @param {Element} elem The DOM into which to render the gauge
- * @param {Object} opts The gauge options
- * @return a Gauge object
- */
- return function Gauge(elem, opts) {
- opts = shallowCopy({}, defaultOptions, opts);
- var gaugeContainer = elem,
- limit = opts.max,
- min = opts.min,
- value = normalize(opts.value, min, limit),
- radius = opts.dialRadius,
- displayValue = opts.showValue,
- startAngle = opts.dialStartAngle,
- endAngle = opts.dialEndAngle,
- valueDialClass = opts.valueDialClass,
- valueTextClass = opts.valueClass,
- valueLabelClass = opts.valueLabelClass,
- dialClass = opts.dialClass,
- gaugeClass = opts.gaugeClass,
- gaugeColor = opts.color,
- gaugeValueElem,
- gaugeValuePath,
- label = opts.label,
- viewBox = opts.viewBox,
- instance;
- if(startAngle < endAngle) {
- console.log("WARN! startAngle < endAngle, Swapping");
- var tmp = startAngle;
- startAngle = endAngle;
- endAngle = tmp;
- }
- function pathString(radius, startAngle, endAngle, largeArc) {
- var coords = getDialCoords(radius, startAngle, endAngle),
- start = coords.start,
- end = coords.end,
- largeArcFlag = typeof(largeArc) === "undefined" ? 1 : largeArc;
- return [
- "M", start.x, start.y,
- "A", radius, radius, 0, largeArcFlag, 1, end.x, end.y
- ].join(" ");
- }
- function initializeGauge(elem) {
- gaugeValueElem = svg("text", {
- x: 50,
- y: 50,
- fill: "#999",
- "class": valueTextClass,
- "font-size": "100%",
- "font-family": "sans-serif",
- "font-weight": "normal",
- "text-anchor": "middle",
- "alignment-baseline": "middle",
- "dominant-baseline": "central"
- });
- gaugeValuePath = svg("path", {
- "class": valueDialClass,
- fill: "none",
- stroke: "#666",
- "stroke-width": 2.5,
- d: pathString(radius, startAngle, startAngle) // value of 0
- });
- var angle = getAngle(100, 360 - Math.abs(startAngle - endAngle));
- var flag = angle <= 180 ? 0 : 1;
- var gaugeElement = svg("svg", {"viewBox": viewBox || "0 0 100 100", "class": gaugeClass},
- [
- svg("path", {
- "class": dialClass,
- fill: "none",
- stroke: "#eee",
- "stroke-width": 2,
- d: pathString(radius, startAngle, endAngle, flag)
- }),
- gaugeValueElem,
- gaugeValuePath
- ]
- );
- elem.appendChild(gaugeElement);
- }
- function updateGauge(theValue, frame) {
- var val = getValueInPercentage(theValue, min, limit),
- // angle = getAngle(val, 360 - Math.abs(endAngle - startAngle)),
- angle = getAngle(val, 360 - Math.abs(startAngle - endAngle)),
- // this is because we are using arc greater than 180deg
- flag = angle <= 180 ? 0 : 1;
- if(displayValue) {
- gaugeValueElem.textContent = label.call(opts, theValue);
- }
- gaugeValuePath.setAttribute("d", pathString(radius, startAngle, angle + startAngle, flag));
- }
- function setGaugeColor(value, duration) {
- var c = gaugeColor(value),
- dur = duration * 1000,
- pathTransition = "stroke " + dur + "ms ease";
- // textTransition = "fill " + dur + "ms ease";
- gaugeValuePath.style = [
- "stroke: " + c,
- "-webkit-transition: " + pathTransition,
- "-moz-transition: " + pathTransition,
- "transition: " + pathTransition,
- ].join(";");
- /*
- gaugeValueElem.style = [
- "fill: " + c,
- "-webkit-transition: " + textTransition,
- "-moz-transition: " + textTransition,
- "transition: " + textTransition,
- ].join(";");
- */
- }
- instance = {
- setMaxValue: function(max) {
- limit = max;
- },
- setValue: function(val) {
- value = normalize(val, min, limit);
- if(gaugeColor) {
- setGaugeColor(value, 0)
- }
- updateGauge(value);
- },
- setValueAnimated: function(val, duration) {
- var oldVal = value;
- value = normalize(val, min, limit);
- if(oldVal === value) {
- return;
- }
- if(gaugeColor) {
- setGaugeColor(value, duration);
- }
- Animation({
- start: oldVal || 0,
- end: value,
- duration: duration || 1,
- step: function(val, frame) {
- updateGauge(val, frame);
- }
- });
- },
- getValue: function() {
- return value;
- }
- };
- initializeGauge(gaugeContainer);
- instance.setValue(value);
- return instance;
- };
- })();
- return Gauge;
- });
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