js canvas模拟布料鼠标拖拽裁剪物理垂摆交互动画效果代码-html代码-BFW代码库

js canvas模拟布料鼠标拖拽裁剪物理垂摆交互动画效果代码

代码语言：html

所属分类：动画

代码描述：js canvas模拟布料鼠标拖拽裁剪物理垂摆交互动画效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">


    <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: 380px;
            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;
        }
        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: #167fc6;
            border: 1px dashed #555;
            padding: 4px 8px;
        }
    </style>

</head>



<body>



    <canvas id="c"></canvas>







    <div id="info">

        <div id="top">

            <a  id="site" >玩法</a>

            <a id="close" href="">关闭</a>

        </div>

        <p>

            <br>- 用鼠标撕扯这块布料.

            <br>

            <br>- 右键点击并拖动裁剪布料

            <br>

            <br>- 如果反应滞后，则降低物理精度参数physics_accuracy

            <br>

            <br>

        </p>

    </div>







    <script type="text/javascript">

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

            e.preventDefault();

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

            return false;

        };

    </script>



    <script type="text/javascript">
        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 <= 0) return;

            var i = this.constraints.length;
            while (i--) this.constraints[i].draw();
        };

        Point..........完整代码请登录后点击上方下载按钮下载查看