Animated Line Chart

Developer
Hakim El Hattab
Size
3,305 Kb
Views
20,240
  1. Animated Line Chart Previews
  2. Animated Line Chart HTML Codes
  3. Animated Line Chart CSS Codes
  4. Animated Line Chart JS Codes

How do I make an animated line chart?

Needed a simple but pretty line chart for a presentation and ended up creating this.. What is a animated line chart? How do you make a animated line chart? This script and codes were developed by Hakim El Hattab on 24 September 2022, Saturday.

Animated Line Chart Previews
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Animated Line Chart - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Animated Line Chart</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <div> <button onclick="append();">Append point</button> <button onclick="restart();">Replay</button> <button onclick="reset();">Reset</button>
</div> <script src="js/index.js"></script>
</body>
</html>

Animated Line Chart - Script Codes CSS Codes

body { background: #000; text-align: center; margin: 0; overflow: hidden;
}
div { position: absolute; left: 5px; top: 5px;
}

Animated Line Chart - Script Codes JS Codes

// don't try to learn anything from the code, it's a
// series of hacks. this one's all about the visuals.
// - @hakimel
var LineChart = function( options ) { var data = options.data; var canvas = document.body.appendChild( document.createElement( 'canvas' ) ); var context = canvas.getContext( '2d' ); var rendering = false, paddingX = 40, paddingY = 40, width = options.width || window.innerWidth, height = options.height || window.innerHeight, progress = 0; canvas.width = width; canvas.height = height; var maxValue, minValue; var y1 = paddingY + ( 0.05 * ( height - ( paddingY * 2 ) ) ), y2 = paddingY + ( 0.50 * ( height - ( paddingY * 2 ) ) ), y3 = paddingY + ( 0.95 * ( height - ( paddingY * 2 ) ) ); format(); render(); function format( force ) { maxValue = 0; minValue = Number.MAX_VALUE; data.forEach( function( point, i ) { maxValue = Math.max( maxValue, point.value ); minValue = Math.min( minValue, point.value ); } ); data.forEach( function( point, i ) { point.targetX = paddingX + ( i / ( data.length - 1 ) ) * ( width - ( paddingX * 2 ) ); point.targetY = paddingY + ( ( point.value - minValue ) / ( maxValue - minValue ) * ( height - ( paddingY * 2 ) ) ); point.targetY = height - point.targetY; if( force || ( !point.x && !point.y ) ) { point.x = point.targetX + 30; point.y = point.targetY; point.speed = 0.04 + ( 1 - ( i / data.length ) ) * 0.05; } } ); } function render() { if( !rendering ) { requestAnimationFrame( render ); return; } context.font = '10px sans-serif'; context.clearRect( 0, 0, width, height ); context.fillStyle = '#222'; context.fillRect( paddingX, y1, width - ( paddingX * 2 ), 1 ); context.fillRect( paddingX, y2, width - ( paddingX * 2 ), 1 ); context.fillRect( paddingX, y3, width - ( paddingX * 2 ), 1 ); if( options.yAxisLabel ) { context.save(); context.globalAlpha = progress; context.translate( paddingX - 15, height - paddingY - 10 ); context.rotate( -Math.PI / 2 ); context.fillStyle = '#fff'; context.fillText( options.yAxisLabel, 0, 0 ); context.restore(); } var progressDots = Math.floor( progress * data.length ); var progressFragment = ( progress * data.length ) - Math.floor( progress * data.length ); data.forEach( function( point, i ) { if( i <= progressDots ) { point.x += ( point.targetX - point.x ) * point.speed; point.y += ( point.targetY - point.y ) * point.speed; context.save(); var wordWidth = context.measureText( point.label ).width; context.globalAlpha = i === progressDots ? progressFragment : 1; context.fillStyle = point.future ? '#aaa' : '#fff'; context.fillText( point.label, point.x - ( wordWidth / 2 ), height - 18 ); if( i < progressDots && !point.future ) { context.beginPath(); context.arc( point.x, point.y, 4, 0, Math.PI * 2 ); context.fillStyle = '#1baee1'; context.fill(); } context.restore(); } } ); context.save(); context.beginPath(); context.strokeStyle = '#1baee1'; context.lineWidth = 2; var futureStarted = false; data.forEach( function( point, i ) { if( i <= progressDots ) { var px = i === 0 ? data[0].x : data[i-1].x, py = i === 0 ? data[0].y : data[i-1].y; var x = point.x, y = point.y; if( i === progressDots ) { x = px + ( ( x - px ) * progressFragment ); y = py + ( ( y - py ) * progressFragment ); } if( point.future && !futureStarted ) { futureStarted = true; context.stroke(); context.beginPath(); context.moveTo( px, py ); context.strokeStyle = '#aaa'; if( typeof context.setLineDash === 'function' ) { context.setLineDash( [2,3] ); } } if( i === 0 ) { context.moveTo( x, y ); } else { context.lineTo( x, y ); } } } ); context.stroke(); context.restore(); progress += ( 1 - progress ) * 0.02; requestAnimationFrame( render ); } this.start = function() { rendering = true; } this.stop = function() { rendering = false; progress = 0; format( true ); } this.restart = function() { this.stop(); this.start(); } this.append = function( points ) { progress -= points.length / data.length; data = data.concat( points ); format(); } this.populate = function( points ) { progress = 0; data = points; format(); }
};
var chart = new LineChart({ data: [] });
reset();
chart.start();
function append() { chart.append([ { label: 'Rnd', value: 1300 + ( Math.random() * 1500 ), future: true } ]);
}
function restart() { chart.restart();
}
function reset() { chart.populate([ { label: 'One', value: 0 }, { label: 'Two', value: 100 }, { label: 'Three', value: 200 }, { label: 'Four', value: 840 }, { label: 'Five', value: 620 }, { label: 'Six', value: 500 }, { label: 'Seven', value: 600 }, { label: 'Eight', value: 1100 }, { label: 'Nine', value: 800 }, { label: 'Ten', value: 900 }, { label: 'Eleven', value: 1200, future: true }, { label: 'Twelve', value: 1400, future: true } ]);
}
Animated Line Chart - Script Codes
Animated Line Chart - Script Codes
Home Page Home
Developer Hakim El Hattab
Username hakimel
Uploaded September 24, 2022
Rating 4.5
Size 3,305 Kb
Views 20,240
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