js表白心形特效

好久没有仔细钻研技术了，闲下来借鉴一下做出一些效果

友情链接： http://tiepeng.applinzi.com/love_you/

body{margin:0;padding:0;background:#ffe;font-size:12px;overflow:auto}
#mainDiv{width:100%;height:100%}
#loveHeart{float:left;width:670px;height:625px}
#garden{width:100%;height:100%}
#elapseClock{text-align:right;font-size:18px;margin-top:10px;margin-bottom:10px}
#words{font-family:"sans-serif";width:500px;font-size:24px;color:#666}
#messages{display:none}
#elapseClock .digit{font-family:"digit";font-size:36px}
#loveu{padding:5px;font-size:22px;margin-top:80px;margin-right:120px;text-align:right;display:none}
#loveu .signature{margin-top:10px;font-size:20px;font-style:italic}
#clickSound{display:none}
#code{float:left;width:440px;height:400px;color:#333;font-family:"Consolas","Monaco","Bitstream Vera Sans Mono","Courier New","sans-serif";font-size:12px}
#code .string{color:#2a36ff}
#code .keyword{color:#7f0055;font-weight:bold}
#code .placeholder{margin-left:15px}#code .space{margin-left:7px}
#code .comments{color:#3f7f5f}
#copyright{margin-top:10px;text-align:center;width:100%;color:#666}
#errorMsg{width:100%;text-align:center;font-size:24px;position:absolute;top:100px;left:0}
#copyright a{color:#666}

var $window = $(window), gardenCtx, gardenCanvas, $garden, garden;
var clientWidth = $(window).width();
var clientHeight = $(window).height();

$(function () {
    // setup garden
    $loveHeart = $("#loveHeart");
    var offsetX = $loveHeart.width() / 2;
    var offsetY = $loveHeart.height() / 2 - 55;
    $garden = $("#garden");
    gardenCanvas = $garden[0];
    gardenCanvas.width = $("#loveHeart").width();
    gardenCanvas.height = $("#loveHeart").height()
    gardenCtx = gardenCanvas.getContext("2d");
    gardenCtx.globalCompositeOperation = "lighter";
    garden = new Garden(gardenCtx, gardenCanvas);
    
    $("#content").css("width", $loveHeart.width() + $("#code").width());
    $("#content").css("height", Math.max($loveHeart.height(), $("#code").height()));
    $("#content").css("margin-top", Math.max(($window.height() - $("#content").height()) / 2, 10));
    $("#content").css("margin-left", Math.max(($window.width() - $("#content").width()) / 2, 10));

    // renderLoop
    setInterval(function () {
        garden.render();
    }, Garden.options.growSpeed);
});

$(window).resize(function() {
    var newWidth = $(window).width();
    var newHeight = $(window).height();
    if (newWidth != clientWidth && newHeight != clientHeight) {
        location.replace(location);
    }
});

function getHeartPoint(angle) {
    var t = angle / Math.PI;
    var x = 19.5 * (16 * Math.pow(Math.sin(t), 3));
    var y = - 20 * (13 * Math.cos(t) - 5 * Math.cos(2 * t) - 2 * Math.cos(3 * t) - Math.cos(4 * t));
    return new Array(offsetX + x, offsetY + y);
}

function startHeartAnimation() {
    var interval = 50;
    var angle = 10;
    var heart = new Array();
    var animationTimer = setInterval(function () {
        var bloom = getHeartPoint(angle);
        var draw = true;
        for (var i = 0; i < heart.length; i++) {
            var p = heart[i];
            var distance = Math.sqrt(Math.pow(p[0] - bloom[0], 2) + Math.pow(p[1] - bloom[1], 2));
            if (distance < Garden.options.bloomRadius.max * 1.3) {
                draw = false;
                break;
            }
        }
        if (draw) {
            heart.push(bloom);
            garden.createRandomBloom(bloom[0], bloom[1]);
        }
        if (angle >= 30) {
            clearInterval(animationTimer);
            showMessages();
        } else {
            angle += 0.2;
        }
    }, interval);
}

(function($) {
    $.fn.typewriter = function() {
        this.each(function() {
            var $ele = $(this), str = $ele.html(), progress = 0;
            $ele.html('');
            var timer = setInterval(function() {
                var current = str.substr(progress, 1);
                if (current == '<') {
                    progress = str.indexOf('>', progress) + 1;
                } else {
                    progress++;
                }
                $ele.html(str.substring(0, progress) + (progress & 1 ? '_' : ''));
                if (progress >= str.length) {
                    clearInterval(timer);
                }
            }, 75);
        });
        return this;
    };
})(jQuery);

function timeElapse(date){
    var current = Date();//现在时间
    var seconds = (Date.parse(current) - Date.parse(date)) / 1000;//毫秒数
    var days = Math.floor(seconds / (3600 * 24));//天数
    seconds = seconds % (3600 * 24);
    var hours = Math.floor(seconds / 3600);
    if (hours < 10) {
        hours = "0" + hours;
    }
    seconds = seconds % 3600;
    var minutes = Math.floor(seconds / 60);
    if (minutes < 10) {
        minutes = "0" + minutes;
    }
    seconds = seconds % 60;
    if (seconds < 10) {
        seconds = "0" + seconds;
    }
    var result = "<span class=\"digit\">" + days + "</span> days <span class=\"digit\">" + hours + "</span> hours <span class=\"digit\">" + minutes + "</span> minutes <span class=\"digit\">" + seconds + "</span> seconds"; 
    $("#elapseClock").html(result);
}

function showMessages() {
    adjustWordsPosition();
    $('#messages').fadeIn(5000, function() {
        showLoveU();
    });
}

function adjustWordsPosition() {
    $('#words').css("position", "absolute");
    $('#words').css("top", $("#garden").position().top + 195);
    $('#words').css("left", $("#garden").position().left + 70);
}

function adjustCodePosition() {
    $('#code').css("margin-top", ($("#garden").height() - $("#code").height()) / 2);
}

function showLoveU() {
    $('#loveu').fadeIn(3000);
}
        function Vector(x, y) {
            this.x = x;
            this.y = y;
        };
        
        Vector.prototype = {
            rotate: function (theta) {
                var x = this.x;
                var y = this.y;
                this.x = Math.cos(theta) * x - Math.sin(theta) * y;
                this.y = Math.sin(theta) * x + Math.cos(theta) * y;
                return this;
            },
            mult: function (f) {
                this.x *= f;
                this.y *= f;
                return this;
            },
            clone: function () {
                return new Vector(this.x, this.y);
            },
            length: function () {
                return Math.sqrt(this.x * this.x + this.y * this.y);
            },
            subtract: function (v) {
                this.x -= v.x;
                this.y -= v.y;
                return this;
            },
            set: function (x, y) {
                this.x = x;
                this.y = y;
                return this;
            }
        };
        
        function Petal(stretchA, stretchB, startAngle, angle, growFactor, bloom) {
            this.stretchA = stretchA;
            this.stretchB = stretchB;
            this.startAngle = startAngle;
            this.angle = angle;
            this.bloom = bloom;
            this.growFactor = growFactor;
            this.r = 1;
            this.isfinished = false;
            //this.tanAngleA = Garden.random(-Garden.degrad(Garden.options.tanAngle), Garden.degrad(Garden.options.tanAngle));
            //this.tanAngleB = Garden.random(-Garden.degrad(Garden.options.tanAngle), Garden.degrad(Garden.options.tanAngle));
        }
        Petal.prototype = {
            draw: function () {
                var ctx = this.bloom.garden.ctx;
                var v1, v2, v3, v4;
                v1 = new Vector(0, this.r).rotate(Garden.degrad(this.startAngle));
                v2 = v1.clone().rotate(Garden.degrad(this.angle));
                v3 = v1.clone().mult(this.stretchA); //.rotate(this.tanAngleA);
                v4 = v2.clone().mult(this.stretchB); //.rotate(this.tanAngleB);
                ctx.strokeStyle = this.bloom.c;
                ctx.beginPath();
                ctx.moveTo(v1.x, v1.y);
                ctx.bezierCurveTo(v3.x, v3.y, v4.x, v4.y, v2.x, v2.y);
                ctx.stroke();
            },
            render: function () {
                if (this.r <= this.bloom.r) {
                    this.r += this.growFactor; // / 10;
                    this.draw();
                } else {
                    this.isfinished = true;
                }
            }
        }

        function Bloom(p, r, c, pc, garden) {
            this.p = p;
            this.r = r;
            this.c = c;
            this.pc = pc;
            this.petals = [];
            this.garden = garden;
            this.init();
            this.garden.addBloom(this);
        }
        Bloom.prototype = {
            draw: function () {
                var p, isfinished = true;
                this.garden.ctx.save();
                this.garden.ctx.translate(this.p.x, this.p.y);
                for (var i = 0; i < this.petals.length; i++) {
                    p = this.petals[i];
                    p.render();
                    isfinished *= p.isfinished;
                }
                this.garden.ctx.restore();
                if (isfinished == true) {
                    this.garden.removeBloom(this);
                }
            },
            init: function () {
                var angle = 360 / this.pc;
                var startAngle = Garden.randomInt(0, 90);
                for (var i = 0; i < this.pc; i++) {
                    this.petals.push(new Petal(Garden.random(Garden.options.petalStretch.min, Garden.options.petalStretch.max), Garden.random(Garden.options.petalStretch.min, Garden.options.petalStretch.max), startAngle + i * angle, angle, Garden.random(Garden.options.growFactor.min, Garden.options.growFactor.max), this));
                }
            }
        }

        function Garden(ctx, element) {
            this.blooms = [];
            this.element = element;
            this.ctx = ctx;
        }
        Garden.prototype = {
            render: function () {
                for (var i = 0; i < this.blooms.length; i++) {
                    this.blooms[i].draw();
                }
            },
            addBloom: function (b) {
                this.blooms.push(b);
            },
            removeBloom: function (b) {
                var bloom;
                for (var i = 0; i < this.blooms.length; i++) {
                    bloom = this.blooms[i];
                    if (bloom === b) {
                        this.blooms.splice(i, 1);
                        return this;
                    }
                }
            },
            createRandomBloom: function (x, y) {
                this.createBloom(x, y, Garden.randomInt(Garden.options.bloomRadius.min, Garden.options.bloomRadius.max), Garden.randomrgba(Garden.options.color.rmin, Garden.options.color.rmax, Garden.options.color.gmin, Garden.options.color.gmax, Garden.options.color.bmin, Garden.options.color.bmax, Garden.options.color.opacity), Garden.randomInt(Garden.options.petalCount.min, Garden.options.petalCount.max));
            },
            createBloom: function (x, y, r, c, pc) {
                new Bloom(new Vector(x, y), r, c, pc, this);
            },
            clear: function () {
                this.blooms = [];
                this.ctx.clearRect(0, 0, this.element.width, this.element.height);
            }
        }

        Garden.options = {
            petalCount: {
                min: 8,
                max: 15
            },
            petalStretch: {
                min: 0.1,
                max: 3
            },
            growFactor: {
                min: 0.1,
                max: 1
            },
            bloomRadius: {
                min: 8,
                max: 10
            },
            density: 10,
            growSpeed: 1000 / 60,
            color: {
                rmin: 128,
                rmax: 255,
                gmin: 0,
                gmax: 128,
                bmin: 0,
                bmax: 128,
                opacity: 0.1
            },
            tanAngle: 60
        };
        Garden.random = function (min, max) {
            return Math.random() * (max - min) + min;
        };
        Garden.randomInt = function (min, max) {
            return Math.floor(Math.random() * (max - min + 1)) + min;
        };
        Garden.circle = 2 * Math.PI;
        Garden.degrad = function (angle) {
            return Garden.circle / 360 * angle;
        };
        Garden.raddeg = function (angle) {
            return angle / Garden.circle * 360;
        };
        Garden.rgba = function (r, g, b, a) {
            return 'rgba(' + r + ',' + g + ',' + b + ',' + a + ')';
        };
        Garden.randomrgba = function (rmin, rmax, gmin, gmax, bmin, bmax, a) {
            var r = Math.round(Garden.random(rmin, rmax));
            var g = Math.round(Garden.random(gmin, gmax));
            var b = Math.round(Garden.random(bmin, bmax));
            var limit = 5;
            if (Math.abs(r - g) <= limit && Math.abs(g - b) <= limit && Math.abs(b - r) <= limit) {
                return Garden.rgba(rmin, rmax, gmin, gmax, bmin, bmax, a);
            } else {
                return Garden.rgba(r, g, b, a);
            }
        };

<div id="mainDiv">
 <div id="content">
  <div id="code">
   <span class="comments">/**</span><br />
   <span class="space"/><span class="comments">*2016—12-09,</span><br />
   <span class="space"/><span class="comments">*2017-04-26.</span><br />
   <span class="space"/><span class="comments">*/</span><br />
   Boy name = <span class="keyword">Mr</span> SHang<br />
   Girl name = <span class="keyword">Mrs</span> YOU<br />
   <span class="comments">// Fall in love river. </span><br />
   The boy love the girl;<br />
   <span class="comments">// They love each other.</span><br />
   The girl loved the boy;<br />
   <span class="comments">// AS time goes on.</span><br />
   The boy can not be separated the girl;<br />
   <span class="comments">// At the same time.</span><br />
   The girl can not be separated the boy;<br />
   <span class="comments">// Both wind and snow all over the sky.</span><br />
   <span class="comments">// Whether on foot or 5 kilometers.</span><br />
   <span class="keyword">The boy</span> very <span class="keyword">happy</span>;<br />
   <span class="keyword">The girl</span> is also very <span class="keyword">happy</span>;<br />
   <span class="placeholder"/><span class="comments">// Whether it is right now</span><br />
   <span class="placeholder"/><span class="comments">// Still in the distant future.</span><br />
   <span class="placeholder"/>The boy has but one dream;<br />
   <span class="comments">// The boy wants the girl could well have been happy.</span><br />
   <br>
   <br>
   I want to say:<br />
   Baby, I love you forever;<br />
  </div>
  <div id="loveHeart">
   <canvas id="garden"></canvas>
   <div id="words">
    <div id="messages">
     遇见你，是最美丽的意外。
     <div id="elapseClock"></div>
    </div>
    <div id="loveu">
     很高兴遇见你。<br/>
     <div class="signature">- 商先生</div>
    </div>
   </div>
  </div>
 </div>
</div>

var offsetX = $("#loveHeart").width() / 2;
var offsetY = $("#loveHeart").height() / 2 - 55;
//var together = new Date(Date.parse("5/28/2015"));
var together = new Date();
together.setFullYear(2016,12,09);
together.setHours(20);
together.setMinutes(0);
together.setSeconds(0);
together.setMilliseconds(0);

if (!document.createElement('canvas').getContext) {
 var msg = document.createElement("div");
 msg.id = "errorMsg";
 msg.innerHTML = "Your browser doesn't support HTML5!<br/>Recommend use Chrome 14+/IE 9+/Firefox 7+/Safari 4+";
 document.body.appendChild(msg);
 $("#code").css("display", "none")
 $("#copyright").css("position", "absolute");
 $("#copyright").css("bottom", "10px");
 document.execCommand("stop");
} else {
 setTimeout(function () {
  startHeartAnimation();
 }, 5000);

 timeElapse(together);
 setInterval(function () {
  timeElapse(together);
 }, 500);

 adjustCodePosition();
 $("#code").typewriter();
}
</script>