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HTML

              
                <div id="root"></div>
              
            
!

CSS

              
                



























// Just some quick and dirty demo styles, don't look here :)
html {
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

svg {
	margin-right: 1rem;
}

strong {
	display: inline-block;
	font-size: 1.2rem;
	min-width: 6ch;
	text-align: center;
}

button {
	appearance: none;
	border: 0;
	border-radius: 5px;
	background: indigo;
	color: white;
	font-family: inherit;
	font-size: 1rem;
	padding: 0.5em 1em;
	
	&:focus,
	&:active {
		background: mediumorchid;
		outline: none;
	}
	
	&[disabled] {
		background: darkgrey;
	}
}
              
            
!

JS

              
                class RadialProgressIndicator extends React.Component {
	
	render() {
		const { progress, strokeColor, strokeWidth, width } = this.props;
		
		// Determine the center of the circle, as that will be both the `cx` and the `cy` attribute.
		const center = width / 2;
		
		// The stroke is applied half inside the circle, so we need to account for it in order to make it appear outside the circle.
		const radius = (width / 2) - (strokeWidth / 2);
		
		// Set the circumference of the circle as our `stroke-dasharray` and our initial `stroke-dashoffset`
		const strokeDasharray = 2 * radius * Math.PI;
		
		// Express progress as a percentage of stroke-dasharray. The difference between stroke-dasharray and this percentage is the stroke-dashoffset
		const strokeDashoffset = progress > 0 ? (strokeDasharray - (strokeDasharray / 100 * progress)) : strokeDasharray;
		
		// We make a perfect circle, so it fits in a square.
		const height = width;
		
		return (
			<svg
				xmlns="http://www.w3.org/2000/svg"
				height={height}
				width={width}
				viewBox={`0 0 ${width} ${height}`}
			>
				<circle
					cx={center}
					cy={center}
					r={radius}
					fill="none"
					stroke={strokeColor}
					strokeWidth={strokeWidth}
					strokeDasharray={strokeDasharray}
					strokeDashoffset={strokeDashoffset}
					transform={`rotate(270, ${center}, ${center})`}
				/>
			</svg>
		);
	}
}

RadialProgressIndicator.propTypes = {
	strokeColor: React.PropTypes.string.isRequired,
	strokeWidth: React.PropTypes.number.isRequired,
	width: React.PropTypes.number.isRequired,
	// The progress prop is just for demo purposes
	progress: React.PropTypes.number.isRequired
};





class App extends React.Component {
	
	constructor(props) {
		super(props);
		
		this._onIncreaseClick = this._onIncreaseClick.bind(this);
		this._onDecreaseClick = this._onDecreaseClick.bind(this);
		
		this.state = {
			progress: 20
		};
	}
	
	_onIncreaseClick() {
		// Increase progress but not further than 100.
		this.setState({
			progress: Math.min(100, this.state.progress + 10)
		});
	}
	
	_onDecreaseClick() {
		// Decrease progress but not further than 0.
		this.setState({
			progress: Math.max(0, this.state.progress - 10)
		});
	}
	
	render() {
		const { progress } = this.state;
		
		return (
			<div>
				<div>
					<button onClick={this._onDecreaseClick} disabled={progress === 0}>Decrease progress</button>
					<strong>{this.state.progress}%</strong>
					<button onClick={this._onIncreaseClick} disabled={progress === 100}>Increase progress</button>
				</div>
				<div>
					<RadialProgressIndicator strokeColor="#BADA55" strokeWidth={10} width={100} progress={progress} />
					<RadialProgressIndicator strokeColor="#BADA55" strokeWidth={20} width={200} progress={progress} />
					<RadialProgressIndicator strokeColor="#BADA55" strokeWidth={30} width={300} progress={progress} />
				</div>
			</div>
		);
	}
}

ReactDOM.render(<App />, document.getElementById('root'));
              
            
!
999px

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