Question

我找到了这个模拟面料物理学的神奇插件：http://codepen.io/anon/pen/mxjKC

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 / 3 - 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 = 'red';
  
    cloth = new Cloth();
  
    update();
}

window.onload = function () {

    canvas  = document.getElementById('c');
    ctx     = canvas.getContext('2d');
    

    canvas.width  = 1120;
    canvas.height = 700;
    canvas.style.width = '560px';
    canvas.style.height = '350px';
    ctx.scale(2,2);
  
    start();
};

<div id=info>
<input type="button" value="close" id="close"></input>
<canvas id="c"></canvas>
</div>

我很想知道如何将它用于图像而不是网络，但我不知道从哪里开始。背后的理论是什么 - 我可以在哪里放置图像？

Answer 1

您无法在该网格上放置图像，因为生成的方块不是2d。 This answer详细说明了原因。

要做你想做的事，你需要使用webGL。这是一个简单的转换，布料是一个网格（连接顶点的顶点和多边形），其中每个顶点将保持一个纹理坐标，你让sim按原样运行。应该有很多关于如何在stackoverflow中将图像映射到网格上的示例。如果您不熟悉3D和编码，可以考虑使用three.js。

Here is an example使用three.js和纹理映射到其上的verlet布。

JavaScript Canvas Fabric Animation：设置背景图片

1 个答案: