js实现canvas鼠标撩动垂柳自然摆动动画效果代码-html代码-BFW代码库

代码语言：html
所属分类：动画
代码描述：js实现canvas鼠标撩动垂柳自然摆动动画效果代码
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
<html>
<head>
    <style>
        html,
        body {
            margin: 0;
            padding: 0;
            height: 100%;
        }
        body {
            user-select: none;
            background-color: #000;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }
        canvas {
            flex-shrink: 0;
            background-color: #222;
            image-rendering: -moz-crisp-edges;
            image-rendering: -webkit-crisp-edges;
            image-rendering: pixelated;
            object-fit: contain;
        }

        #message {
            color: white;
            font-family: sans-serif;
            position: absolute;
            left: 50%;
            top: 40%;
            transform: translate(-50%,-50%);
            text-align: center;
        }
        h1,h4 {
            margin: 0;
        }
        h1 {
            font-size: 10vmin;
        }

        h4 {
            font-size: 4vmin;
        }
    </style>
  
</head>
<body>
    <div></div>
    <script>
        function lerpColor(a, b, amount) {
            var ah = parseInt(a.replace(/#/g, ""), 16),
            ar = ah >> 16,
            ag = (ah >> 8) & 0xff,
            ab = ah & 0xff,
            bh = parseInt(b.replace(/#/g, ""), 16),
            br = bh >> 16,
            bg = (bh >> 8) & 0xff,
            bb = bh & 0xff,
            rr = ar + amount * (br - ar),
            rg = ag + amount * (bg - ag),
            rb = ab + amount * (bb - ab);

            return (
                "#" + (((1 << 24) + (rr << 16) + (rg << 8) + rb) | 0).toString(16).slice(1)
            );
        }

        const PI = Math.PI,
        TWO_PI = Math.PI * 2;

        const Util = {};
        Util.timeStamp = function() {
            return window.performance.now();
        };
        Util.random = function(min, max) {
            return min + Math.random() * (max - min);
        };
        Util.map = function(a, b, c, d, e) {
            return (a - b) / (c - b) * (e - d) + d;
        };
        Util.lerp = function(value1, value2, amount) {
            return value1 + (value2 - value1) * amount;
        };
        Util.clamp = function(value, min, max) {
            return Math.max(min, Math.min(max, value));
        };

        const Tween = {};
        Tween.linear = function(currentTime, start, degreeOfChange, duration) {
            return degreeOfChange * currentTime / duration + start;
        };
        Tween.easeInOutQuad = function(t, b, c, d) {
            t /= d / 2;
            if (t < 1) return c / 2 * t * t + b;
            t--;
            return -c / 2 * (t * (t - 2) - 1) + b;
        };
        Tween.easeInOutExpo = function(t, b, c, d) {
            t /= d / 2;
            if (t < 1) return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
            t--;
            return c / 2 * (-Math.pow(2, -10 * t) + 2) + b;
        };
        class v3 {
            constructor(x, y, z) {
                this.x = x;
                this.y = y;
                this.z = z;
            }
        }

        class Vector {
            constructor(x, y) {
                this.x = x || 0;
                this.y = y || 0;
            }
            set(x, y) {
                this.x = x;
                this.y = y;
            }
            reset() {
                this.x = 0;
                this.y = 0;
            }
            fromAngle(angle) {
                let x = Math.cos(angle),
                y = Math.sin(angle);
                return new Vector(x, y);
            }
            add(vector) {
                this.x += vector.x;
                this.y += vector.y;
            }
            sub(vector) {
                this.x -= vector.x;
                this.y -= vector.y;
            }
            mult(scalar) {
                this.x *= scalar;
                this.y *= scalar;
            }
            div(scalar) {
                this.x /= scalar;
                this.y /= scalar;
            }
            dot(vector) {
                return vector.x * this.x + vector.y * this.y;
            }
            limit(limit_value) {
                if (this.mag() > limit_value) this.setMag(limit_value);
            }
            mag() {
                return Math.hypot(this.x, this.y);
            }
            setMag(new_mag) {
                if (this.mag() > 0) {
                    this.normalize();
                } else {
                    this.x = 1;
                    this.y = 0;
                }
                this.mult(new_mag);
            }
            normalize() {
                let mag = this.mag();
                if (mag > 0) {
                    this.x /= mag;
                    this.y /= mag;
                }
            }
            heading() {
                return Math.atan2(this.y, this.x);
            }
            setHeading(angle) {
                let mag = this.mag();
                this.x = Math.cos(angle) * mag;
                this.y = Math.sin(angle) * mag;
            }
            dist(vector) {
                return new Vector(this.x - vector.x, this.y - vector.y).mag();
            }
            angle(vector) {
                return Math.atan2(vector.y - this.y, vector.x - this.x);
            }
            copy() {
                return new Vector(this.x, this.y);
            }
        }

        // init canvas
        let canvas = document.createElement("canvas"),
        ctx = canvas.getContext("2d"),
        W,
        H;

        document.body.appendChild(canvas);
        setSize();

        document.body.onresize = function() {
            let old_width = W;
            setSize();
            populate();
        };

        function setSize() {
            W = canvas.width = window.innerWidth;
            H = canvas.height = window.innerHeight;
            ctx.lineCap = "round";
            ctx.lineJoin = "round";
        }

        let mouse = new Vector(W/2, H/2);
        canvas.onmousemove = function(event) {
            mouse.x = event.clientX - canvas.offsetLeft;
            mouse.y = event.clientY - canvas.offsetTop;
        };


        //
        class Point {
            constructor(x, y) {
                this.position = new Vector(x, y);
                this.old_position = this.position.copy();
                this.pinned = false;
                this.angle = undefined;
            }
            render() {
                ctx.beginPath();
                ctx.arc(this.position.x, this.position.y, 4, 0, 2 * Math.PI);
                ctx.stroke();
            }
        }

        class Leaf {
            constructor(parent, length) {
                this.parent = parent;
                this.end = new Point(parent.position.x, parent.position.y + (length * Util.random(0.9, 1.1)));
                this.end.angle = 0;
                this.z_value = 0;
                this.colors = ["#2c4c28",
                    "#48792c",
                    "#69982d"];
                this.true_color = this.colors[
                    Math.floor(Math.random() * this.colors.length)
                ];
                this.size = (length * 2) * Util.random(0.8, 1.2);
                this.thickness = this.size * 0.5 * Util.random(0.6, 1.2);
            }
            setZ(z_value) {
                this.z_value = z_value;
                this.color = lerpColor(this.true_color, backgroundColor, this.z_value);
            }
            render() {
                ctx.strokeStyle = this.color;
                //ctx.lineWidth = this.thickness;
                ctx.beginPath();
                ctx.moveTo(this.parent.position.x, this.parent.position.y);
                ctx.lineTo(this.end.position.x, this.end.position.y);
                ctx.closePath();
                ctx.stroke();
                /*
    ctx.save();
    ctx.translate(this.parent.position.x, this.parent.position.y);
    ctx.rotate(angle + Math.PI / 2);
    ctx.beginPath();
    ctx.ellipse(0, -this.size, this.thickness, this.size, 0, 0, 2 * Math.PI);
    ctx.fill();
    ctx.restore();
  */
            }
        }

        class Link {
            constructor(p0, p1) {
                this.p0 = p0;
                this.p1 = p1;
                this.length = .........完整代码请登录后点击上方下载按钮下载查看