XubxBlog-VUE/src/js/Sakura.js

//全屏樱花飘落
let stop, staticx; // eslint-disable-line no-unused-vars
let img = new Image();
img.src = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAUgAAAEwCAYAAADVZeifAAAACXBIWXMAAACYAAAAmAGiyIKYAAAHG2lUWHRYTUw6Y29tLmFkb2JlLnhtcAAAAAAAPD94cGFja2V0IGJlZ2luPSLvu78iIGlkPSJXNU0wTXBDZWhpSHpyZVN6TlRjemtjOWQiPz4gPHg6eG1wbWV0YSB4bWxuczp4PSJhZG9iZTpuczptZXRhLyIgeDp4bXB0az0iQWRvYmUgWE1QIENvcmUgNS42LWMxNDIgNzkuMTYwOTI0LCAyMDE3LzA3LzEzLTAxOjA2OjM5ICAgICAgICAiPiA8cmRmOlJERiB4bWxuczpyZGY9Imh0dHA6Ly93d3cudzMub3JnLzE5OTkvMDIvMjItcmRmLXN5bnRheC1ucyMiPiA8cmRmOkRlc2NyaXB0aW9uIHJkZjphYm91dD0iIiB4bWxuczp4bXBSaWdodHM9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9yaWdodHMvIiB4bWxuczp4bXBNTT0iaHR0cDovL25zLmFkb2JlLmNvbS94YXAvMS4wL21tLyIgeG1sbnM6c3RSZWY9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9zVHlwZS9SZXNvdXJjZVJlZiMiIHhtbG5zOnN0RXZ0PSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvc1R5cGUvUmVzb3VyY2VFdmVudCMiIHhtbG5zOnhtcD0iaHR0cDovL25zLmFkb2JlLmNvbS94YXAvMS4wLyIgeG1sbnM6ZGM9Imh0dHA6Ly9wdXJsLm9yZy9kYy9lbGVtZW50cy8xLjEvIiB4bWxuczpwaG90b3Nob3A9Imh0dHA6Ly9ucy5hZG9iZS5jb20vcGhvdG9zaG9wLzEuMC8iIHhtcFJpZ2h0czpNYXJrZWQ9IkZhbHNlIiB4bXBNTTpPcmlnaW5hbERvY3VtZW50SUQ9InhtcC5kaWQ6NDFDMjQxQjYyNjIwNjgxMTgwODNEMjE2MDAzOTU1NDQiIHhtcE1NOkRvY3VtZW50SUQ9ImFkb2JlOmRvY2lkOnBob3Rvc2hvcDozNDVjOWViOC04NDc4LTFkNDctOGRjMi0yZDkyOGNhYTYxZWQiIHhtcE1NOkluc3RhbmNlSUQ9InhtcC5paWQ6YjAzN2ZiMGItNTU5Mi0xYjRkLWJjZGQtOWU4NGExMDJiMGM2IiB4bXA6Q3JlYXRvclRvb2w9IkFkb2JlIFBob3Rvc2hvcCBDQyAoV2luZG93cykiIHhtcDpDcmVhdGVEYXRlPSIyMDE4LTA1LTA5VDE0OjQ5OjM3KzA4OjAwIiB4bXA6TW9kaWZ5RGF0ZT0iMjAxOC0wNS0wOVQxNDo1MToyNSswODowMCIgeG1wOk1ldGFkYXRhRGF0ZT0iMjAxOC0wNS0wOVQxNDo1MToyNSswODowMCIgZGM6Zm9ybWF0PSJpbWFnZS9wbmciIHBob3Rvc2hvcDpDb2xvck1vZGU9IjMiIHBob3Rvc2hvcDpJQ0NQcm9maWxlPSJzUkdCIElFQzYxOTY2LTIuMSI+IDx4bXBNTTpEZXJpdmVkRnJvbSBzdFJlZjppbnN0YW5jZUlEPSJ4bXAuaWlkOjEyMjVlZWE3LTEyY2QtMTY0NC04ZDAzLWFjOTE2ZTAxZDQ1YyIgc3RSZWY6ZG9jdW1lbnRJRD0idXVpZDoxRDIwNUFGNjZCRDlFNTExOUM5REMwMzg2RjlEQjFGNyIvPiA8eG1wTU06SGlzdG9yeT4gPHJkZjpTZXE+IDxyZGY6bGkgc3RFdnQ6YWN0aW9uPSJzYXZlZCIgc3RFdnQ6aW5zdGFuY2VJRD0ieG1wLmlpZDphYmMzNjIzMy1hOWNkLWNiNDQtODViYi0zZTgyMjEwYmIxMjYiIHN0RXZ0OndoZW49IjIwMTgtMDUtMDlUMTQ6NTE6MjUrMDg6MDAiIHN0RXZ0OnNvZnR3YXJlQWdlbnQ9IkFkb2JlIFBob3Rvc2hvcCBDQyAyMDE4IChXaW5kb3dzKSIgc3RFdnQ6Y2hhbmdlZD0iLyIvPiA8cmRmOmxpIHN0RXZ0OmFjdGlvbj0ic2F2ZWQiIHN0RXZ0Omluc3RhbmNlSUQ9InhtcC5paWQ6YjAzN2ZiMGItNTU5Mi0xYjRkLWJjZGQtOWU4NGExMDJiMGM2IiBzdEV2dDp3aGVuPSIyMDE4LTA1LTA5VDE0OjUxOjI1KzA4OjAwIiBzdEV2dDpzb2Z0d2FyZUFnZW50PSJBZG9iZSBQaG90b3Nob3AgQ0MgMjAxOCAoV2luZG93cykiIHN0RXZ0OmNoYW5nZWQ9Ii8iLz4gPC9yZGY6U2VxPiA8L3htcE1NOkhpc3Rvcnk+IDwvcmRmOkRlc2NyaXB0aW9uPiA8L3JkZjpSREY+IDwveDp4bXBtZXRhPiA8P3hwYWNrZXQgZW5kPSJyIj8+XCpBoAAApBxJREFUeNrs/cmSI8u2LIipLnMHosnc59Z7jyxhjSg1oggn/EWO+SP8B34JhRyWCItk1at7786MBnBbWoNlZm4OOLrIvc8+t45bCjIQjibQuKuvTlUpCdva1ra2ta3zZdtHsK1tbWtbG0Bua1vb2tYGkNva1ra2tQHktra1rW1tALmtbW1rWxtAbmtb29rWBpDb2ta2trUB5La2ta1tbQC5rW1ta1sbQG5rW9va1gaQ29rWtra1AeS2trWtbW1rA8htbWtb29oAclvb2ta2NoDc1ra2ta0NILe1rW1tawPIbW1rW9vaAHJb29rWtjaA3Na2trWtDSC3ta1tbWsDyG1ta1vb2gByW9va1rY2gNzWtra1rW1tALmtbW1rWxtAbmtb29rWBpDb2ta2trUB5La2ta1tbQC5rW1ta1sbQG5rW9va1gaQ29rWtra1AeS2trWtbW0Aua1tbWtbG0Bua1vb2tY/3xr+o7+Bf/2//z/+1OfPAIgJErGbMj7M8fue+O1A7LLjcxyw+5hwZMbgQnLgKIftRsgMyYUjBYNhOn6AADiMOGDCyIQBCflwwNEdw24HHA5AzhjHJxyQwZTADLgmHJPhDRnfjo6PlPHbNOJDGZgEZsIgOAHPR/yPwxv+28MONOBghIEAiXce8LkzuAG/vRP7o+EzAcMRyNlxoJByxj4T/8su4+UgPE3A++jg5yfe/lvD73/b4eVfM17/zfE//y3h6UjsJ8f/9N8m/Of/Cnz/d0cegHES/t///Q7HHfG/+/8JT0fABGQTzIEkYMyGf/0vBh8N3/99wv/rP/1/sDs6/i//+t8DZhCATOFwzPj4/R3/MhkOmPBz/47dB+CY8LZ/w/NnQh4cu88dppSRU4abQwbQCRPhdDx/PCGbI9f7JLXbRfHpYw+n4MOkPAAUSacBmfv30f/rf+f+8m+GpyPw8Zrhl0IMAmK5KgAOWCY4Ib6r8pO+/hiV/5c/LyyVe6g8TnH5P/3f/q8bwv2zA+TfZ7HtvKbY4ScCOxCU4EaYE04hxb0hOYgEATAJTsGYkP2IQQBocAkkAGMBQcdgA47HA3aMg0cQkhmOGRhEZAMoIpdDhiREQYzXJQBDSQwygFGLdwET2/3c2luLx9fXzjhKk4hs8QTmsd2OAiHkIR4wZmFKxNMRGI7C5xPxt3+Lv+0GvL47/r/fBgBCJpAcYPwVAICbsPsE/v0VSJl49if8+/C/IEMwCIQBcCQLUBeBlOOFi4K5wanyGcgAiPEe5XSApInJsllCQkAVQNFStpTcUjoakxtNZqJIwtIx2XigpUyaG2xSdvPj9/+aPy3zoORuorKVD7OCoZfLxAUgMhegrEBYf1p8x2pYdxUKITVEXIBhewFit21bG0D+HWoQDgJwiERSAF622CFNgpsh5YypHPck4S7YEEcjQQhAsoRj/ixARHiBOVpAhsthNkCKPZwCvNvTB1Ugi7/dnpunr9mQYJjoGGWLOooVUAcDbAWV6CleN9sxJwzOeE/lczgakQ4OkzCNhBuwOwo/n+M+u4Pwsbd4dQ

function Sakura(x, y, s, r, fn) {
    this.x = x;
    this.y = y;
    this.s = s;
    this.r = r;
    this.fn = fn;
}

Sakura.prototype.draw = function(cxt) {
    cxt.save();
    //这个数值是花瓣大小,电脑端网页 40 效果最好
    let xc = 18 * this.s;
    cxt.translate(this.x, this.y);
    cxt.rotate(this.r);
    cxt.drawImage(img, 0, 0, xc, xc)
    cxt.restore();
}

Sakura.prototype.update = function() {
    this.x = this.fn.x(this.x, this.y);
    this.y = this.fn.y(this.y, this.y);
    this.r = this.fn.r(this.r);
    if(this.x > window.innerWidth ||
        this.x < 0 ||
        this.y > window.innerHeight ||
        this.y < 0
    ) {
        this.r = getRandom('fnr');
        if(Math.random() > 0.4) {
            this.x = getRandom('x');
            this.y = 0;
            this.s = getRandom('s');
            this.r = getRandom('r');
        } else {
            this.x = window.innerWidth;
            this.y = getRandom('y');
            this.s = getRandom('s');
            this.r = getRandom('r');
        }
    }
}

let SakuraList;
SakuraList = function() {
        this.list = [];
}
SakuraList.prototype.push = function(sakura) {
    this.list.push(sakura);
}
SakuraList.prototype.update = function() {
    let i = 0, len = this.list.length;
    for(; i < len; i++) {
        this.list[i].update();
    }
}
SakuraList.prototype.draw = function(cxt) {
    let i = 0, len = this.list.length;
    for(; i < len; i++) {
        this.list[i].draw(cxt);
    }
}
SakuraList.prototype.get = function(i) {
    return this.list[i];
}
SakuraList.prototype.size = function() {
    return this.list.length;
}

function getRandom(option) {
    let ret, random;
    switch(option) {
        case 'x':
            ret = Math.random() * window.innerWidth;
            break;
        case 'y':
            ret = Math.random() * window.innerHeight;
            break;
        case 's':
            ret = Math.random();
            break;
        case 'r':
            ret = Math.random() * 6;
            break;
        case 'fnx':
            random = -0.5 + Math.random();
            ret = function(x) {
                return x + 0.5 * random - 1.7;
            };
            break;
        case 'fny':
            random = 1.5 + Math.random() * 0.7
            ret = function(x, y) {
                return y + random;
            };
            break;
        case 'fnr':
            random = Math.random() * 0.03;
            ret = function(r) {
                return r + random;
            };
            break;
    }
    return ret;
}
//开始樱花飘落效果
export function startSakura() {

    let requestAnimationFrame = window.requestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        window.oRequestAnimationFrame;
    let canvas = document.createElement('canvas'),
        cxt;
    staticx = true;
    canvas.height = window.innerHeight;
    canvas.width = window.innerWidth;
    canvas.setAttribute('style', 'position: fixed;left: 0;top: 0;z-index:9999;pointer-events: none;');
    canvas.setAttribute('id', 'canvas_sakura');
    if(!document.querySelector("#canvas_sakura")){
        document.getElementsByTagName('body')[0].appendChild(canvas);
    }
    cxt = canvas.getContext('2d');
    let sakuraList = new SakuraList();
    // 花瓣数量
    for(let i = 0; i < 50; i++) {
        let sakura, randomX, randomY, randomS, randomR, randomFnx, randomFny, randomFnR;
        randomX = getRandom('x');
        randomY = getRandom('y');
        randomR = getRandom('r');
        randomS = getRandom('s');
        randomFnx = getRandom('fnx');
        randomFny = getRandom('fny');
        randomFnR = getRandom('fnr');
        sakura = new Sakura(randomX, randomY, randomS, randomR, {
            x: randomFnx,
            y: randomFny,
            r: randomFnR
        });
        sakura.draw(cxt);
        sakuraList.push(sakura);
    }
    stop = requestAnimationFrame(function reverse() {
        cxt.clearRect(0, 0, canvas.width, canvas.height);
        sakuraList.update();
        sakuraList.draw(cxt);
        stop = requestAnimationFrame(reverse);
    })
}


window.onresize = function() {
    let canvasSnow = document.getElementById('canvas_sakura');
    canvasSnow.width = window.innerWidth;
    canvasSnow.height = window.innerHeight;
}

img.onload = function() {
    startSakura();
}
//清楚樱花效果方法
export function stopSakura() {
    if(staticx) {
        let child = document.getElementById("canvas_sakura");
        document.getElementsByTagName('body')[0].removeChild(child)
        // 取消动画帧请求
        // window.cancelAnimationFrame(stop);
        staticx = false;
    } else {
        startSakura();
    }
}