heart

Posted 2020-08-20 webNick
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了heart相关的知识，希望对你有一定的参考价值。
好久没写博客了，不想废话，直接欣赏效果！
附完整代码：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>heart nick</title>
    <style>
        canvas {
            position: absolute;
            left:0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,.2);
        }
    </style>
<script>
    window.requestAnimationFrame =
            window.__requestAnimationFrame ||
            window.requestAnimationFrame ||
            window.webkitRequestAnimationFrame ||
            window.mozRequestAnimationFrame ||
            window.oRequestAnimationFrame ||
            window.msRequestAnimationFrame ||
            (function () {
                return function (callback, element) {
                    var lastTime = element.__lastTime;
                    if (lastTime === undefined) {
                        lastTime = 0;
                    }
                    var currTime = Date.now();
                    var timeToCall = Math.max(1, 33 - (currTime - lastTime));
                    window.setTimeout(callback, timeToCall);
                    element.__lastTime = currTime + timeToCall;
                };
            })();
    window.isDevice = (/android|webos|iphone|ipad|ipod|blackberry|iemobile|opera mini/i.test(((navigator.userAgent || navigator.vendor || window.opera)).toLowerCase()));
    var loaded = false;
    var init = function () {
        if (loaded) return;
        loaded = true;
        var mobile = window.isDevice;
        var koef = mobile ? 0.5 : 1;
        var canvas = document.getElementById(\'heart\');
        var ctx = canvas.getContext(\'2d\');
        var width = canvas.width = koef * innerWidth;
        var height = canvas.height = koef * innerHeight;
        var rand = Math.random;
        ctx.fillStyle = "rgba(0,0,0,1)";
        ctx.fillRect(0, 0, width, height);

        var heartPosition = function (rad) {
            //return [Math.sin(rad), Math.cos(rad)];
            return [Math.pow(Math.sin(rad), 3), -(15 * Math.cos(rad) - 5 * Math.cos(2 * rad) - 2 * Math.cos(3 * rad) - Math.cos(4 * rad))];
        };
        var scaleAndTranslate = function (pos, sx, sy, dx, dy) {
            return [dx + pos[0] * sx, dy + pos[1] * sy];
        };

        window.addEventListener(\'resize\', function () {
            width = canvas.width = koef * innerWidth;
            height = canvas.height = koef * innerHeight;
            ctx.fillStyle = "rgba(0,0,0,1)";
            ctx.fillRect(0, 0, width, height);
        });

        var traceCount = mobile ? 20 : 50;
        var pointsOrigin = [];
        var i;
        var dr = mobile ? 0.3 : 0.1;
        for (i = 0; i < Math.PI * 2; i += dr) pointsOrigin.push(scaleAndTranslate(heartPosition(i), 210, 13, 0, 0));
        for (i = 0; i < Math.PI * 2; i += dr) pointsOrigin.push(scaleAndTranslate(heartPosition(i), 150, 9, 0, 0));
        for (i = 0; i < Math.PI * 2; i += dr) pointsOrigin.push(scaleAndTranslate(heartPosition(i), 90, 5, 0, 0));
        var heartPointsCount = pointsOrigin.length;

        var targetPoints = [];
        var pulse = function (kx, ky) {
            for (i = 0; i < pointsOrigin.length; i++) {
                targetPoints[i] = [];
                targetPoints[i][0] = kx * pointsOrigin[i][0] + width / 2;
                targetPoints[i][1] = ky * pointsOrigin[i][1] + height / 2;
            }
        };

        var e = [];
        for (i = 0; i < heartPointsCount; i++) {
            var x = rand() * width;
            var y = rand() * height;
            e[i] = {
                vx: 0,
                vy: 0,
                R: 2,
                speed: rand() + 5,
                q: ~~(rand() * heartPointsCount),
                D: 2 * (i % 2) - 1,
                force: 0.2 * rand() + 0.7,
                f: "hsla(0," + ~~(40 * rand() + 60) + "%," + ~~(60 * rand() + 20) + "%,.3)",
                trace: []
            };
            for (var k = 0; k < traceCount; k++) e[i].trace[k] = {x: x, y: y};
        }

        var config = {
            traceK: 0.4,
            timeDelta: 0.01
        };

        var time = 0;
        var loop = function () {
            ctx.font="50px Arial";
            ctx.fillStyle=\'red\';
            ctx.fillText("ejiao",20,60);
            ctx.fillText("happay",canvas.width-190,60);
            ctx.fillText("every",20,canvas.height-30);
            ctx.fillText("day",canvas.width-100,canvas.height-30);
            var n = -Math.cos(time);
            pulse((1 + n) * .5, (1 + n) * .5);
            time += ((Math.sin(time)) < 0 ? 9 : (n > 0.8) ? .2 : 1) * config.timeDelta;
            ctx.fillStyle = "rgba(0,0,0,.1)";
            ctx.fillRect(0, 0, width, height);
            for (i = e.length; i--;) {
                var u = e[i];
                var q = targetPoints[u.q];
                var dx = u.trace[0].x - q[0];
                var dy = u.trace[0].y - q[1];
                var length = Math.sqrt(dx * dx + dy * dy);
                if (10 > length) {
                    if (0.95 < rand()) {
                        u.q = ~~(rand() * heartPointsCount);
                    }
                    else {
                        if (0.99 < rand()) {
                            u.D *= -1;
                        }
                        u.q += u.D;
                        u.q %= heartPointsCount;
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