console
var Dial = function(container) {
this.container = container;
this.size = this.container.dataset.size;
this.strokeWidth = this.size / 8;
this.radius = (this.size / 2) - (this.strokeWidth / 2);
this.value = this.container.dataset.value;
this.direction = this.container.dataset.arrow;
this.svg;
this.defs;
this.slice;
this.overlay;
this.text;
this.arrow;
this.create();
}
Dial.prototype.create = function() {
this.createSvg();
this.createDefs();
this.createSlice();
this.createOverlay();
this.createText();
this.createArrow();
this.container.appendChild(this.svg);
};
Dial.prototype.createSvg = function() {
var svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
svg.setAttribute('width', this.size + 'px');
svg.setAttribute('height', this.size + 'px');
this.svg = svg;
};
Dial.prototype.createDefs = function() {
var defs = document.createElementNS("http://www.w3.org/2000/svg", "defs");
var linearGradient = document.createElementNS("http://www.w3.org/2000/svg", "linearGradient");
linearGradient.setAttribute('id', 'gradient');
var stop1 = document.createElementNS("http://www.w3.org/2000/svg", "stop");
stop1.setAttribute('stop-color', '#6E4AE2');
stop1.setAttribute('offset', '0%');
linearGradient.appendChild(stop1);
var stop2 = document.createElementNS("http://www.w3.org/2000/svg", "stop");
stop2.setAttribute('stop-color', '#78F8EC');
stop2.setAttribute('offset', '100%');
linearGradient.appendChild(stop2);
var linearGradientBackground = document.createElementNS("http://www.w3.org/2000/svg", "linearGradient");
linearGradientBackground.setAttribute('id', 'gradient-background');
var stop1 = document.createElementNS("http://www.w3.org/2000/svg", "stop");
stop1.setAttribute('stop-color', 'rgba(0, 0, 0, 0.2)');
stop1.setAttribute('offset', '0%');
linearGradientBackground.appendChild(stop1);
var stop2 = document.createElementNS("http://www.w3.org/2000/svg", "stop");
stop2.setAttribute('stop-color', 'rgba(0, 0, 0, 0.05)');
stop2.setAttribute('offset', '100%');
linearGradientBackground.appendChild(stop2);
defs.appendChild(linearGradient);
defs.appendChild(linearGradientBackground);
this.svg.appendChild(defs);
this.defs = defs;
};
Dial.prototype.createSlice = function() {
var slice = document.createElementNS("http://www.w3.org/2000/svg", "path");
slice.setAttribute('fill', 'none');
slice.setAttribute('stroke', 'url(#gradient)');
slice.setAttribute('stroke-width', this.strokeWidth);
slice.setAttribute('transform', 'translate(' + this.strokeWidth / 2 + ',' + this.strokeWidth / 2 + ')');
slice.setAttribute('class', 'animate-draw');
this.svg.appendChild(slice);
this.slice = slice;
};
Dial.prototype.createOverlay = function() {
var r = this.size - (this.size / 2) - this.strokeWidth / 2;
var circle = document.createElementNS("http://www.w3.org/2000/svg", "circle");
circle.setAttribute('cx', this.size / 2);
circle.setAttribute('cy', this.size / 2);
circle.setAttribute('r', r);
circle.setAttribute('fill', 'url(#gradient-background)');
this.svg.appendChild(circle);
this.overlay = circle;
};
Dial.prototype.createText = function() {
var fontSize = this.size / 3.5;
var text = document.createElementNS("http://www.w3.org/2000/svg", "text");
text.setAttribute('x', (this.size / 2) + fontSize / 7.5);
text.setAttribute('y', (this.size / 2) + fontSize / 4);
text.setAttribute('font-family', 'Century Gothic, Lato');
text.setAttribute('font-size', fontSize);
text.setAttribute('fill', '#78F8EC');
text.setAttribute('text-anchor', 'middle');
var tspanSize = fontSize / 3;
text.innerHTML = 0 + '<tspan font-size="' + tspanSize + '" dy="' + -tspanSize * 1.2 + '">%</tspan>';
this.svg.appendChild(text);
this.text = text;
};
Dial.prototype.createArrow = function() {
var arrowSize = this.size / 10;
var arrowYOffset, m;
if(this.direction === 'up') {
arrowYOffset = arrowSize / 2;
m = -1;
}
else if(this.direction === 'down') {
arrowYOffset = 0;
m = 1;
}
var arrowPosX = ((this.size / 2) - arrowSize / 2);
var arrowPosY = (this.size - this.size / 3) + arrowYOffset;
var arrowDOffset = m * (arrowSize / 1.5);
var arrow = document.createElementNS("http://www.w3.org/2000/svg", "path");
arrow.setAttribute('d', 'M 0 0 ' + arrowSize + ' 0 ' + arrowSize / 2 + ' ' + arrowDOffset + ' 0 0 Z');
arrow.setAttribute('fill', '#97F8F0');
arrow.setAttribute('opacity', '0.6');
arrow.setAttribute('transform', 'translate(' + arrowPosX + ',' + arrowPosY + ')');
this.svg.appendChild(arrow);
this.arrow = arrow;
};
Dial.prototype.animateStart = function() {
var v = 0;
var self = this;
var intervalOne = setInterval(function() {
var p = +(v / self.value).toFixed(2);
var a = (p < 0.95) ? 2 - (2 * p) : 0.05;
v += a;
if(v >= +self.value) {
v = self.value;
clearInterval(intervalOne);
}
self.setValue(v);
}, 10);
};
Dial.prototype.animateReset = function() {
this.setValue(0);
};
Dial.prototype.polarToCartesian = function(centerX, centerY, radius, angleInDegrees) {
var angleInRadians = (angleInDegrees-90) * Math.PI / 180.0;
return {
x: centerX + (radius * Math.cos(angleInRadians)),
y: centerY + (radius * Math.sin(angleInRadians))
};
}
Dial.prototype.describeArc = function(x, y, radius, startAngle, endAngle){
var start = this.polarToCartesian(x, y, radius, endAngle);
var end = this.polarToCartesian(x, y, radius, startAngle);
var largeArcFlag = endAngle - startAngle <= 180 ? "0" : "1";
var d = [
"M", start.x, start.y,
"A", radius, radius, 0, largeArcFlag, 0, end.x, end.y
].join(" ");
return d;
}
Dial.prototype.setValue = function(value) {
var c = (value / 100) * 360;
if(c === 360)
c = 359.99;
var xy = this.size / 2 - this.strokeWidth / 2;
var d = this.describeArc(xy, xy, xy, 180, 180 + c);
this.slice.setAttribute('d', d);
var tspanSize = (this.size / 3.5) / 3;
this.text.innerHTML = Math.floor(value) + '<tspan font-size="' + tspanSize + '" dy="' + -tspanSize * 1.2 + '">%</tspan>';
};
var containers = document.getElementsByClassName("chart");
var dial = new Dial(containers[0]);
dial.animateStart();
<div class="wrapper">
<div class="container chart" data-size="400" data-value="88" data-arrow="up">
</div>
</div>
body {
background: #18222F;
}
.wrapper {
position: absolute;
width: 400px;
height: 400px;
margin: auto;
top: 0;
bottom: 0;
left: 0;
right: 0;
display: flex;
flex-direction: row;
}
.container {
flex: 1;
padding: 0 20px;
}