JSFiddle - React, Tailwind, and code Playground

by dylanfm

HTML

<div id="canvas"> </div>

CSS

body {
    background: #f7fafb;
}

JavaScript

var amount = prompt("What perccent? (0-100)", "50");

var archtype = Raphael("canvas", 105, 105);

var getFinalPoint = function (xloc, yloc, value, total, R) {
    var alpha = 360 / total * value,
        a = (90 - alpha) * Math.PI / 180,
        x = xloc + R * Math.cos(a),
        y = yloc - R * Math.sin(a);
    return [x,y];
};

archtype.customAttributes.arc = function (xloc, yloc, value, total, R) {
    var alpha = 360 / total * value,
        a = (90 - alpha) * Math.PI / 180,
        x = xloc + R * Math.cos(a),
        y = yloc - R * Math.sin(a),
        path = [["M", xloc, yloc - R]];
    if (total === value) {
        path.push(["A", R, R, 0, 1, 1, xloc - 0.01, yloc - R]);
    } else {
        path.push(["A", R, R, 0, +(alpha > 180), 1, x, y]);
    }
    return {
        path: path
    };
};

// Make an arc at 50,50 with a radius of 48 that grows from 0 to amount of 100 with a bounce
var my_arc = archtype.path().attr({
    "stroke": "#18abe1",
    "stroke-width": 2,
    arc: [50, 50, 0, 100, 48]
});

my_arc.animate({
    arc: [50, 50, amount, 100, 48]
}, 500, "easeIn");

// Add a dot at the final point of the arc, if it's < 100
if (amount < 100) {
    var finalPoint = getFinalPoint(50, 50, amount, 100, 48),
        dot = archtype
              .circle(finalPoint[0], finalPoint[1], 0)
              .attr({ fill: '#18abe1', stroke: 'none' }),
        anim = Raphael.animation({ r: 4 }, 300, "easeOut");
    dot.animate(anim.delay(500));
}