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- <!DOCTYPE html>
- <html lang="en" >
- <head>
- <meta charset="UTF-8">
- <title>Ткань</title>
- <link rel="stylesheet" href="css/style.css">
- <style>
- * {
- margin: 0;
- overflow: hidden;
- -webkit-user-select: none;
- -moz-user-select: none;
- -ms-user-select: none;
- -o-user-select: none;
- user-select: none;
- }
- body {
- background: #F2F2F2;
- }
- #c {
- display: block;
- margin: 20px auto 0;
- }
- #info {
- position: absolute;
- left: -1px;
- top: -1px;
- width: auto;
- max-width: 420px;
- height: auto;
- background: #f2f2f2;
- border-bottom-right-radius: 10px;
- border:1px solid #333;
- }
- #top {
- background: #fff;
- width: 100%;
- height: auto;
- position: relative;
- border-bottom: 1px solid #eee;
- }
- p {
- font-family: Arial, sans-serif;
- color: #666;
- text-align: justify;
- font-size: 16px;
- margin: 10px 16px;
- }
- #github, #twitter {
- color:#3377ee;
- font-family: Helvetica, Arial, sans-serif;
- font-size: 19px;
- margin: 0 auto;
- text-align: center;
- text-decoration:none;
- }
- #net {
- text-align:center;
- white-space:nowrap;
- font-size:19px;
- background:rgba(0,0,0,0.1);
- padding:8px 12px;
- border-radius:8px;
- display:block;
- color:#888;
- }
- #net > span {
- color:#3377ee;
- font-family: Helvetica, Arial, sans-serif;
- font-size: 14px;
- display: block;
- margin: 0 auto;
- text-align: center;
- text-decoration:none;
- }
- a {
- font-family: sans-serif;
- color: #444;
- text-decoration: none;
- font-size: 20px;
- }
- #site {
- float: left;
- margin: 10px;
- color: #ff9900;
- border-bottom: 1px dashed #ccc;
- padding-bottom:3px
- }
- #site:hover {
- color: #ffaa11;
- }
- #close {
- float: right;
- margin: 10px;
- }
- #p {
- font-family: Verdana, sans-serif;
- position: absolute;
- right: 10px;
- bottom: 10px;
- color: #4099ff;
- border: 1px dashed #4099ff;
- padding: 4px 8px;
- }
- #irc {
- display: block;
- text-align: center;
- margin-top:4px;
- color: #333;
- }
- #irc a {
- color: #3377ee;
- font-size: 17px
- }
- #irc-info {
- display: block;
- text-align: center;
- font-size: 14px;
- margin-top: -10px;
- color: #828282;
- margin-bottom:4px
- }
- #new {
- width: 100%;
- text-align: center;
- font-size: 18px;
- font-family: Helvetica;
- }
- #new a {
- font-size: 26px;
- color: #4099ff;
- }
- </style>
- </head>
- <body>
- <canvas id="c"></canvas>
- <div id="info">
- <div id="top">
- <a id="close" href="">×</a>
- </div>
- <p>
- <br>- Оторвите ткань мышью
- <br>
- <br>- Щелкните правой кнопкой мыши и перетащите, чтобы разрезать ткань
- <br>
- <br>
- <br><a id="github" target="_blank" href="https://vk.com/dima.durov">VK</a> • <a id="twitter" target="_blank" href="https://vk.com/dima.durov">DimaDurov</a>
- <br>
- </p>
- </div>
- <script>
- document.getElementById('close').onmousedown = function(e) {
- e.preventDefault();
- document.getElementById('info').style.display = 'none';
- return false;
- };
- // settings
- var physics_accuracy = 3,
- mouse_influence = 20,
- mouse_cut = 5,
- gravity = 1200,
- cloth_height = 30,
- cloth_width = 50,
- start_y = 20,
- spacing = 7,
- tear_distance = 60;
- window.requestAnimFrame =
- window.requestAnimationFrame ||
- window.webkitRequestAnimationFrame ||
- window.mozRequestAnimationFrame ||
- window.oRequestAnimationFrame ||
- window.msRequestAnimationFrame ||
- function (callback) {
- window.setTimeout(callback, 1000 / 60);
- };
- var canvas,
- ctx,
- cloth,
- boundsx,
- boundsy,
- mouse = {
- down: false,
- button: 1,
- x: 0,
- y: 0,
- px: 0,
- py: 0
- };
- var Point = function (x, y) {
- this.x = x;
- this.y = y;
- this.px = x;
- this.py = y;
- this.vx = 0;
- this.vy = 0;
- this.pin_x = null;
- this.pin_y = null;
- this.constraints = [];
- };
- Point.prototype.update = function (delta) {
- if (mouse.down) {
- var diff_x = this.x - mouse.x,
- diff_y = this.y - mouse.y,
- dist = Math.sqrt(diff_x * diff_x + diff_y * diff_y);
- if (mouse.button == 1) {
- if (dist < mouse_influence) {
- this.px = this.x - (mouse.x - mouse.px) * 1.8;
- this.py = this.y - (mouse.y - mouse.py) * 1.8;
- }
- } else if (dist < mouse_cut) this.constraints = [];
- }
- this.add_force(0, gravity);
- delta *= delta;
- nx = this.x + ((this.x - this.px) * .99) + ((this.vx / 2) * delta);
- ny = this.y + ((this.y - this.py) * .99) + ((this.vy / 2) * delta);
- this.px = this.x;
- this.py = this.y;
- this.x = nx;
- this.y = ny;
- this.vy = this.vx = 0
- };
- Point.prototype.draw = function () {
- if (!this.constraints.length) return;
- var i = this.constraints.length;
- while (i--) this.constraints[i].draw();
- };
- Point.prototype.resolve_constraints = function () {
- if (this.pin_x != null && this.pin_y != null) {
- this.x = this.pin_x;
- this.y = this.pin_y;
- return;
- }
- var i = this.constraints.length;
- while (i--) this.constraints[i].resolve();
- this.x > boundsx ? this.x = 2 * boundsx - this.x : 1 > this.x && (this.x = 2 - this.x);
- this.y < 1 ? this.y = 2 - this.y : this.y > boundsy && (this.y = 2 * boundsy - this.y);
- };
- Point.prototype.attach = function (point) {
- this.constraints.push(
- new Constraint(this, point)
- );
- };
- Point.prototype.remove_constraint = function (constraint) {
- this.constraints.splice(this.constraints.indexOf(constraint), 1);
- };
- Point.prototype.add_force = function (x, y) {
- this.vx += x;
- this.vy += y;
- };
- Point.prototype.pin = function (pinx, piny) {
- this.pin_x = pinx;
- this.pin_y = piny;
- };
- var Constraint = function (p1, p2) {
- this.p1 = p1;
- this.p2 = p2;
- this.length = spacing;
- };
- Constraint.prototype.resolve = function () {
- var diff_x = this.p1.x - this.p2.x,
- diff_y = this.p1.y - this.p2.y,
- dist = Math.sqrt(diff_x * diff_x + diff_y * diff_y),
- diff = (this.length - dist) / dist;
- if (dist > tear_distance) this.p1.remove_constraint(this);
- var px = diff_x * diff * 0.5;
- var py = diff_y * diff * 0.5;
- this.p1.x += px;
- this.p1.y += py;
- this.p2.x -= px;
- this.p2.y -= py;
- };
- Constraint.prototype.draw = function () {
- ctx.moveTo(this.p1.x, this.p1.y);
- ctx.lineTo(this.p2.x, this.p2.y);
- };
- var Cloth = function () {
- this.points = [];
- var start_x = canvas.width / 2 - cloth_width * spacing / 2;
- for (var y = 0; y <= cloth_height; y++) {
- for (var x = 0; x <= cloth_width; x++) {
- var p = new Point(start_x + x * spacing, start_y + y * spacing);
- x != 0 && p.attach(this.points[this.points.length - 1]);
- y == 0 && p.pin(p.x, p.y);
- y != 0 && p.attach(this.points[x + (y - 1) * (cloth_width + 1)])
- this.points.push(p);
- }
- }
- };
- Cloth.prototype.update = function () {
- var i = physics_accuracy;
- while (i--) {
- var p = this.points.length;
- while (p--) this.points[p].resolve_constraints();
- }
- i = this.points.length;
- while (i--) this.points[i].update(.016);
- };
- Cloth.prototype.draw = function () {
- ctx.beginPath();
- var i = cloth.points.length;
- while (i--) cloth.points[i].draw();
- ctx.stroke();
- };
- function update() {
- ctx.clearRect(0, 0, canvas.width, canvas.height);
- cloth.update();
- cloth.draw();
- requestAnimFrame(update);
- }
- function start() {
- canvas.onmousedown = function (e) {
- mouse.button = e.which;
- mouse.px = mouse.x;
- mouse.py = mouse.y;
- var rect = canvas.getBoundingClientRect();
- mouse.x = e.clientX - rect.left,
- mouse.y = e.clientY - rect.top,
- mouse.down = true;
- e.preventDefault();
- };
- canvas.onmouseup = function (e) {
- mouse.down = false;
- e.preventDefault();
- };
- canvas.onmousemove = function (e) {
- mouse.px = mouse.x;
- mouse.py = mouse.y;
- var rect = canvas.getBoundingClientRect();
- mouse.x = e.clientX - rect.left,
- mouse.y = e.clientY - rect.top,
- e.preventDefault();
- };
- canvas.oncontextmenu = function (e) {
- e.preventDefault();
- };
- boundsx = canvas.width - 1;
- boundsy = canvas.height - 1;
- ctx.strokeStyle = '#888';
- cloth = new Cloth();
- update();
- }
- window.onload = function () {
- canvas = document.getElementById('c');
- ctx = canvas.getContext('2d');
- canvas.width = 560;
- canvas.height = 350;
- start();
- };
- </script>
- <script src="js/index.js"></script>
- </body>
- </html>
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