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搬运代码 js 3d画布

<html class=""><head><meta charset="UTF-8">     

<script type="text/javascript" style="display: none !important;">   

function cleanJS(js) {          js = js.replace(/location(s+)?=/mi, '');  

js = js.replace(/top.location.+=('|")/mi, '');    

js = js.replace(/location.replace/mi, '');     

js = js.replace(/window(s+)?\[(s+)?("|')l/mi, '');    

js = js.replace(/self(s+)?\[(s+)?("|')loc/mi, '');    

return js;     

}      

_ogEval        = window.eval;    

window.eval    = function(text) {_ogEval(cleanJS(text));};   

window.open    = function(){};    

window.print   = function(){};     

window.innerWidth = window.outerWidth; 

</script>

 

<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:#333;

}

 

canvas {

  background:#333;

  width:1000px;

  height:376px;

  margin:0 auto;

  display:block;

}

 

#info {

  position:absolute;

  left:-1px;

  top:-1px;

  width:auto;

  max-width:380px;

  height:auto;

  background:#f2f2f2;

  border-bottom-right-radius:10px;

}

 

#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;

}

 

a {

  font-family:sans-serif;

  color:#444;

  text-decoration:none;

  font-size: 20px;

}

 

#site {

  float:left;

  margin: 10px;

  color: #38a;

  border-bottom:1px dashed #888;

}

 

#site:hover {

  color: #7af;

}

 

#close {

  float:right;

  margin: 10px;

}

 

#p {

  font-family: Verdana, sans-serif;

  position:absolute;

  right:10px;

  bottom:10px;

  color:#adf;

  border: 1px dashed #555;

  padding:4px 8px;

}</style></head><body>

<canvas id="c" width="1000" height="376"> </canvas>

   

<div id="info">

  <div id="top">

  <a id="close" href=""></a>

  </div>

</div>

   

   

<script class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="http://s.codepen.io/assets/libs/empty.js" type="text/javascript"></script>

<script>/*

Copyright (c) 2013 lonely-pixel.com, Stuffit at codepen.io (http://codepen.io/stuffit)

 

View this and others at http://lonely-pixel.com

 

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

 

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

*/

 

document.getElementById('close').onmousedown = function(e) {

  e.preventDefault();

  document.getElementById('info').style.display = 'none';

  return false;

};

  

// settings

 

var physics_accuracy = 5,

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

    };

 

window.onload = function() {

 

    canvas = document.getElementById('c');

    ctx    = canvas.getContext('2d');

 

    canvas.width = canvas.clientWidth;

    canvas.height = 376;

 

    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 = 'rgba(222,222,222,0.6)';

    cloth = new Cloth();

    update();

};

 

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 <= 0) 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(lnk) {

 

    var i = this.constraints.length;

    while(i--) if(this.constraints[i] == lnk) this.constraints.splice(i, 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);

}//@ sourceURL=pen.js</script>

</body></html>

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