canvas撕衣服

Html

Css




    
        ×
    
    

        
- 哈哈， 点右键或者用力点击撕破衣服，有点儿邪恶

* {
	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 {
	color:#3377ee;
	font-family:Helvetica,Arial,sans-serif;
	font-size:19px;
	display:block;
	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:18px;
	color:#4099ff;
}

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 = 'pink';

cloth = new Cloth();

update();
}

window.onload = function() {

canvas = document.getElementById('c');
    ctx = canvas.getContext('2d');

canvas.width = 1020;
    canvas.height = 800;

start();
};

↑上面代码改变，会自动显示代码结果 jQuery调用版本：1.11.3

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canvas撕衣服



代码描述：canvas撕衣服

canvas做的2.5d 撕衣服

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无拘0

2019/8/15 10:17:04

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2019/8/15 10:17:04

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凡小点0

2018/7/3 11:59:15

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2018/6/25 17:49:06

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