Elastic String

Developer
Akimitsu Hamamuro
Size
17,622 Kb
Views
60,690

How do I make an elastic string?

Inspired by http://codepen.io/tholman/pen/qCnfB. What is a elastic string? How do you make a elastic string? This script and codes were developed by Akimitsu Hamamuro on 13 June 2022, Monday.

Elastic String Previews
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Elastic String - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Elastic String</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <canvas id='c'></canvas> <script src='js/kzymdn.js'></script> <script src="js/index.js"></script>
</body>
</html>

Elastic String - Script Codes CSS Codes

html, body { height: 100%;
}
body { font-family: sans-serif; padding: 0; margin: 0; background-repeat: no-repeat; background-attachment: fixed; background-color: #f9f9f2;	background-image: -webkit-radial-gradient(center, circle farthest-side, #F9F9F2 0%, #D6D6D0 100%);	background-image: -moz-radial-gradient(center, circle farthest-side, #F9F9F2 0%, #D6D6D0 100%);	background-image: -ms-radial-gradient(center, circle farthest-side, #F9F9F2 0%, #D6D6D0 100%);	background-image: -o-radial-gradient(center, circle farthest-side, #F9F9F2 0%, #D6D6D0 100%);	background-image: radial-gradient(center, circle farthest-side, #F9F9F2 0%, #D6D6D0 100%);
}
canvas { position: absolute; top: 0; left: 0;
}

Elastic String - Script Codes JS Codes

/** * requestAnimationFrame */
window.requestAnimationFrame = (function(){ return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (callback) { window.setTimeout(callback, 1000 / 60); };
})();
/** * ElasticString */
var ElasticString = (function(document) { 'use strict'; /** * @constructor */ function ElasticString(fontSize, fontFamily, friction, spring) { this._fontSize = fontSize; this.points = []; this.fontFamily = fontFamily || 'serif'; if (friction !== undefined) this.friction = friction; if (spring !== undefined) this.spring = spring; // 最後のテキストポイントの補完ポイント this._endPoint = new Point(); // フォントサイズ this._ctx = document.createElement('canvas').getContext('2d'); } ElasticString.prototype = { points: null, fontFamily: 'serif', friction: 0.02, spring: 0.6, _text: '', _fontSize: 1, _endPoint: null, setFontSize: function(fontSize) { this._fontSize = fontSize; this.setText(this._text); }, getFontSize: function() { return this._fontSize; }, setText: function(text, positions) { var points = this.points, p, letter, between, i, len; if (text.length < points.length) { points = points.slice(0, text.length); } this._ctx.font = this._fontSize + 'px ' + this.fontFamily; for (i = 0, len = text.length; i < len; i++) { letter = text.charAt(i); between = this._ctx.measureText(letter).width; p = points[i]; if (p) { p.letter = letter; p.between = between; } else { p = new Point(letter, between); points[i] = p; } if (positions && positions.length) { p.x = p.px = positions[i][0]; p.y = p.py = positions[i][1]; } } this.points = points; this._text = text; }, getText: function() { return this._text; }, render: function(ctx) { var points = this.points, pointBetween = this._fontSize, spring = this.spring, text = this.text, dx, dy, dist, scale, p0, p1, size, angle, i, len; points.push(this._endPoint); this._updatePoint(points[0]); for (i = 0, len = points.length - 1; i < len; i++) { p0 = points[i]; p1 = points[i + 1]; this._updatePoint(p1); dx = p0.x - p1.x; dy = p0.y - p1.y; dist = Math.sqrt(dx * dx + dy * dy); scale = dist ? (p0.between - dist) / dist * 0.5 * spring : 0; dx *= scale; dy *= scale; p0.x += dx; p0.y += dy; p1.x -= dx; p1.y -= dy; } for (i = 0; i < len; i++) { p0 = points[i]; p1 = points[i + 1]; dx = p1.x - p0.x; dy = p1.y - p0.y; dist = Math.sqrt(dx * dx + dy * dy); angle = Math.atan2(dy, dx); ctx.save(); size = pointBetween > dist ? pointBetween : dist; ctx.font = size + 'px ' + this.fontFamily; ctx.translate(p0.x, p0.y); ctx.rotate(angle); ctx.fillText(p0.letter, 0, 0); ctx.restore(); } points.pop(); }, _updatePoint: function(p) { var friction = 1 - this.friction, px = p.px, py = p.py; p.px = p.x; p.py = p.y; if (p.fixed) return; p.x += (p.x - px) * friction; p.y += (p.y - py) * friction; } }; /** * Point */ function Point(letter, between, x, y) { this.letter = letter || ''; this.between = between || 0; this.x = this.px = x || 0; this.y = this.py = y || 0; } Point.prototype = { letter: '', between: 1, x: 0, y: 0 }; return ElasticString;
})(document);
(function(window, document) { 'use strict'; // Configs var TEXT = 'The quick brown fox jumps over the lazy dog.', FONT_SIZE = 25; // Vars var canvas, context, elasticString, mouse = { x: 0, y: 0 }, drag = null, gui, guiOptions; // Init function init() { var pos = [], i, len; canvas = document.getElementById('c'); context = canvas.getContext('2d'); resize(null); elasticString = new ElasticString(FONT_SIZE, 'Georgia, serif'); for (i = 0, len = TEXT.length; i < len; i++) { if (i === 0) pos.push([100, 100]); else pos.push([canvas.width * Math.random(), canvas.height * Math.random()]); } elasticString.setText(TEXT, pos); window.addEventListener('resize', resize, false); canvas.addEventListener('mousemove', mouseMove, false); canvas.addEventListener('mousedown', mouseDown, false); document.body.addEventListener('mouseup', mouseUp, false); // GUI guiOptions = { text: elasticString.getText(), fontSize: elasticString.getFontSize() }; gui = new dat.GUI(); gui.add(guiOptions, 'text').onFinishChange(function() { elasticString.setText(guiOptions.text); }); gui.add(guiOptions, 'fontSize', 1, 50).onChange(function() { elasticString.setFontSize(guiOptions.fontSize); }); gui.add(elasticString, 'friction', 0, 1); gui.add(elasticString, 'spring', 0, 1); gui.close(); update(); } // Event Listeners function resize(e) { canvas.width = window.innerWidth; canvas.height = window.innerHeight; context.fillStyle = '#3a3a2c'; } function mouseMove(e) { mouse.x = e.clientX; mouse.y = e.clientY; } function mouseDown(e) { var points = elasticString.points, p, hit = null, rangeSq = FONT_SIZE * FONT_SIZE, hitNear = FONT_SIZE * FONT_SIZE, mx = e.clientX, my = e.clientY, dx, dy, distSq, i, len; for (i = 0, len = points.length; i < len; i++) { p = points[i]; dx = mx - p.x; dy = my - p.y; distSq = dx * dx + dy * dy; if (distSq < rangeSq && distSq < hitNear) { hitNear = distSq; hit = points[i]; } } drag = hit; } function mouseUp(e) { drag = null; } // Update function update() { var points = elasticString.points, p, w = canvas.width, h = canvas.height, i, len; if (drag) { drag.x = mouse.x; drag.y = mouse.y; } for (i = 0, len = points.length; i < len; i++) { p = points[i]; if (0 > p.x) p.x = 0; if (w < p.x) p.x = w; if (0 > p.y) p.y = 0; if (h < p.y) p.y = h; } context.clearRect(0, 0, canvas.width, canvas.height); elasticString.render(context); requestAnimationFrame(update); } // Run init();
})(window, document);
Elastic String - Script Codes
Elastic String - Script Codes
Home Page Home
Developer Akimitsu Hamamuro
Username akm2
Uploaded June 13, 2022
Rating 4
Size 17,622 Kb
Views 60,690
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