Spiral

Developer
Hakim El Hattab
Size
2,958 Kb
Views
20,240
  1. Spiral Previews
  2. Spiral HTML Codes
  3. Spiral CSS Codes
  4. Spiral JS Codes

How do I make an spiral?

Drag/swipe to rotate. . What is a spiral? How do you make a spiral? This script and codes were developed by Hakim El Hattab on 24 September 2022, Saturday.

Spiral Previews
IQ Test

Spiral - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Spiral</title> <meta name="viewport" content="width=700"> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css"> <link rel="stylesheet" href="css/style.css">
</head>
<body> <canvas></canvas>
<span>drag to rotate</span> <script src="js/index.js"></script>
</body>
</html>

Spiral - Script Codes CSS Codes

body { display: -webkit-box; display: -ms-flexbox; display: flex; height: 100vh; background-color: #111;
}
canvas { margin: auto;
}
span { color: #777; position: absolute; top: 20px; left: 20px; -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none;
}

Spiral - Script Codes JS Codes

var canvas = document.querySelector( 'canvas' );
var context = canvas.getContext( '2d' );
var time = 0, velocity = 0.1, velocityTarget = 0.1, width, height, lastX, lastY;
var MAX_OFFSET = 400;
var SPACING = 4;
var POINTS = MAX_OFFSET / SPACING;
var PEAK = MAX_OFFSET * 0.25;
var POINTS_PER_LAP = 6;
var SHADOW_STRENGTH = 6;
setup();
function setup() { resize(); step(); window.addEventListener( 'resize', resize ); window.addEventListener( 'mousedown', onMouseDown ); document.addEventListener( 'touchstart', onTouchStart );
}
function resize() { width = canvas.width = window.innerWidth; height = canvas.height = window.innerHeight;
}
function step() { time += velocity; velocity += ( velocityTarget - velocity ) * 0.3; clear(); render(); requestAnimationFrame( step );
}
function clear() { context.clearRect( 0, 0, width, height );
}
function render() { var x, y, cx = width/2, cy = height/2; context.globalCompositeOperation = 'lighter'; context.strokeStyle = '#fff'; context.shadowColor = '#fff'; context.lineWidth = 2; context.beginPath(); for( var i = POINTS; i > 0; i -- ) { var value = i * SPACING + ( time % SPACING ); var ax = Math.sin( value/POINTS_PER_LAP ) * Math.PI, ay = Math.cos( value/POINTS_PER_LAP ) * Math.PI; x = ax * value, y = ay * value * 0.35; var o = 1 - ( Math.min( value, PEAK ) / PEAK ); y -= Math.pow( o, 2 ) * 200; y += 200 * value / MAX_OFFSET; y += x / cx * width * 0.1; context.globalAlpha = 1 - ( value / MAX_OFFSET ); context.shadowBlur = SHADOW_STRENGTH * o; context.lineTo( cx + x, cy + y ); context.stroke(); context.beginPath(); context.moveTo( cx + x, cy + y ); } context.lineTo( cx, cy - 200 ); context.lineTo( cx, 0 ); context.stroke();
}
function onMouseDown( event ) { lastX = event.clientX; lastY = event.clientY; document.addEventListener( 'mousemove', onMouseMove ); document.addEventListener( 'mouseup', onMouseUp );
}
function onMouseMove( event ) { var vx = ( event.clientX - lastX ) / 100; var vy = ( event.clientY - lastY ) / 100; if( event.clientY < height/2 ) vx *= -1; if( event.clientX > width/2 ) vy *= -1; velocityTarget = vx + vy; lastX = event.clientX; lastY = event.clientY;
}
function onMouseUp( event ) { document.removeEventListener( 'mousemove', onMouseMove ); document.removeEventListener( 'mouseup', onMouseUp );
}
function onTouchStart( event ) { event.preventDefault(); lastX = event.touches[0].clientX; lastY = event.touches[0].clientY; document.addEventListener( 'touchmove', onTouchMove ); document.addEventListener( 'touchend', onTouchEnd );
}
function onTouchMove( event ) { var vx = ( event.touches[0].clientX - lastX ) / 100; var vy = ( event.touches[0].clientY - lastY ) / 100; if( event.touches[0].clientY < height/2 ) vx *= -1; if( event.touches[0].clientX > width/2 ) vy *= -1; velocityTarget = vx + vy; lastX = event.touches[0].clientX; lastY = event.touches[0].clientY;
}
function onTouchEnd( event ) { document.removeEventListener( 'touchmove', onTouchMove ); document.removeEventListener( 'touchend', onTouchEnd );
}
Spiral - Script Codes
Spiral - Script Codes
Home Page Home
Developer Hakim El Hattab
Username hakimel
Uploaded September 24, 2022
Rating 4.5
Size 2,958 Kb
Views 20,240
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