index.js

/**
 * 不知由何人写的粒子动画显示文字效果
 */
let female = getUrlParam("female")
if(female == null) female = "莉莉"
let male = getUrlParam("male")
if(male == null) male = "思洁"
let meet_time = getUrlParam("meet_time")
if(meet_time == null) meet_time = "2020-03-22 23:59:59"
let image_url = getUrlParam("image_url")
console.log(image_url)
if(image_url != null) {
    let logo = document.getElementById('logo')
    logo.src = image_url
}
let if_mobile = get_device({"navigator": navigator})
var S = {
    init: function () {
        S.Drawing.init('.canvas');
        document.body.classList.add('body--ready');
        //想说的话
        S.UI.simulate(`${female}|I'm|${male}|Nice|to|Meet|You|#countdown 3|#time`);
        S.Drawing.loop(function () {
            S.Shape.render();
        });
    }
};

function getUrlParam(name){
    var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)"); //构造一个含有目标参数的正则表达式对象
    var r = window.location.search.substring(1).match(reg);  //匹配目标参数
    if (r!=null) return decodeURI(r[2]); return null; //返回参数值
}

function get_device($window) {
    /**
     * 获取是否是手机的标识
     */
    console.log($window)
    let navigator_ = $window.navigator
    if(navigator_) var ua = navigator_['userAgent'] || navigator_['vendor'] || $window['opera'];
    let flag = (/iPhone|iPod|iPad|Silk|Android|BlackBerry|Opera Mini|IEMobile/).test(ua);
    return flag;
}

S.Drawing = (function () {
    var canvas,
        context,
        renderFn,
        requestFrame = window.requestAnimationFrame ||
            window.webkitRequestAnimationFrame ||
            window.mozRequestAnimationFrame ||
            window.oRequestAnimationFrame ||
            window.msRequestAnimationFrame ||
            function (callback) {
                window.setTimeout(callback, 1000 / 60);
            };

    return {
        init: function (el) {
            canvas = document.querySelector(el);
            context = canvas.getContext('2d');
            this.adjustCanvas();

            window.addEventListener('resize', function (e) {
                S.Drawing.adjustCanvas();
            });
        },
        loop: function (fn) {
            renderFn = !renderFn ? fn : renderFn;
            this.clearFrame();
            renderFn();
            requestFrame.call(window, this.loop.bind(this));
        },
        adjustCanvas: function () {
            canvas.width = window.innerWidth - 50;
            canvas.height = window.innerHeight - 30;
        },
        clearFrame: function () {
            context.clearRect(0, 0, canvas.width, canvas.height);
        },
        getArea: function () {
            return {w: canvas.width, h: canvas.height};
        },
        drawCircle: function (p, c) {
            context.fillStyle = c.render();
            context.beginPath();
            context.arc(p.x, p.y, p.z, 0, 2 * Math.PI, true);
            context.closePath();
            context.fill();
        }
    };
}());


S.UI = (function () {
    var interval,
        currentAction,
        time,
        maxShapeSize = 60,
        sequence = [],
        cmd = '#';

    function formatTime(date) {
        var h = date.getHours(),
            m = date.getMinutes(),
            m = m < 10 ? '0' + m : m;
        return h + ':' + m;
    }

    function getValue(value) {
        return value && value.split(' ')[1];
    }

    function getAction(value) {
        value = value && value.split(' ')[0];
        return value && value[0] === cmd && value.substring(1);
    }

    function timedAction(fn, delay, max, reverse) {
        clearInterval(interval);
        currentAction = reverse ? max : 1;
        fn(currentAction);

        if (!max || (!reverse && currentAction < max) || (reverse && currentAction > 0)) {
            interval = setInterval(function () {
                currentAction = reverse ? currentAction - 1 : currentAction + 1;
                fn(currentAction);

                if ((!reverse && max && currentAction === max) || (reverse && currentAction === 0)) {
                    clearInterval(interval);
                }
            }, delay);
        }
    }

    function performAction(value) {
        var action,
            value,
            current;

        sequence = typeof (value) === 'object' ? value : sequence.concat(value.split('|'));

        timedAction(function (index) {
            current = sequence.shift();
            action = getAction(current);
            value = getValue(current);

            switch (action) {
                case 'countdown':
                    value = parseInt(value) || 10;
                    value = value > 0 ? value : 10;

                    timedAction(function (index) {
                        if (index === 0) {
                            if (sequence.length === 0) {
                                S.Shape.switchShape(S.ShapeBuilder.letter(''));
                            } else {
                                performAction(sequence);
                                setTimeout(function(){
                                    window.open(`love.html?male=${male}&female=${female}&meet_time=${meet_time}`, '_self');
                                },200)
                                
                            }
                        } else {
                            S.Shape.switchShape(S.ShapeBuilder.letter(index), true);
                        }
                    }, 1000, value, true);
                    break;

                case 'rectangle':
                    value = value && value.split('x');
                    value = (value && value.length === 2) ? value : [maxShapeSize, maxShapeSize / 2];

                    S.Shape.switchShape(S.ShapeBuilder.rectangle(Math.min(maxShapeSize, parseInt(value[0])), Math.min(maxShapeSize, parseInt(value[1]))));
                    break;

                case 'circle':
                    value = parseInt(value) || maxShapeSize;
                    value = Math.min(value, maxShapeSize);
                    S.Shape.switchShape(S.ShapeBuilder.circle(value));
                    break;

                case 'time':
                    var t = formatTime(new Date());

                    if (sequence.length > 0) {
                        S.Shape.switchShape(S.ShapeBuilder.letter(t));
                    } else {
                        timedAction(function () {
                            t = formatTime(new Date());
                            if (t !== time) {
                                time = t;
                                S.Shape.switchShape(S.ShapeBuilder.letter(time));
                            }
                        }, 1000);
                    }
                    break;

                default:
                    S.Shape.switchShape(S.ShapeBuilder.letter(current[0] === cmd ? 'HacPai' : current));
            }
        }, 3000, sequence.length);
    }

    return {
        simulate: function (action) {
            performAction(action);
        }
    };
}());


S.Point = function (args) {
    this.x = args.x;
    this.y = args.y;
    this.z = args.z;
    // if(args.z > 5) {
    //     console.log(args)
    // }
    this.a = args.a;
    this.h = args.h;
};


S.Color = function (r, g, b, a) {
    this.r = r;
    this.g = g;
    this.b = b;
    this.a = a;
};

S.Color.prototype = {
    render: function () {
        return 'rgba(' + this.r + ',' + +this.g + ',' + this.b + ',' + this.a + ')';
    }
};


S.Dot = function (x, y) {
    this.p = new S.Point({
        x: x,
        y: y,
        z: 5,
        a: 1,
        h: 0
    });

    this.e = 0.07;
    this.s = true;

    this.c = new S.Color(255, 255, 255, this.p.a);

    this.t = this.clone();
    this.q = [];
};

S.Dot.prototype = {
    clone: function () {
        return new S.Point({
            x: this.x,
            y: this.y,
            z: this.z,
            a: this.a,
            h: this.h
        });
    },
    _draw: function () {
        this.c.a = this.p.a;
        S.Drawing.drawCircle(this.p, this.c);
    },
    _moveTowards: function (n) {
        var details = this.distanceTo(n, true),
            dx = details[0],
            dy = details[1],
            d = details[2],
            e = this.e * d;

        if (this.p.h === -1) {
            this.p.x = n.x;
            this.p.y = n.y;
            return true;
        }

        if (d > 1) {
            this.p.x -= ((dx / d) * e);
            this.p.y -= ((dy / d) * e);
        } else {
            if (this.p.h > 0) {
                this.p.h--;
            } else {
                return true;
            }
        }

        return false;
    },
    _update: function () {
        if (this._moveTowards(this.t)) {
            var p = this.q.shift();

            if (p) {
                this.t.x = p.x || this.p.x;
                this.t.y = p.y || this.p.y;
                this.t.z = p.z || this.p.z;
                this.t.a = p.a || this.p.a;
                this.p.h = p.h || 0;
            } else {
                if (this.s) {
                    this.p.x -= Math.sin(Math.random() * 3.142);
                    this.p.y -= Math.sin(Math.random() * 3.142);
                } else {
                    this.move(new S.Point({
                        x: this.p.x + (Math.random() * 50) - 25,
                        y: this.p.y + (Math.random() * 50) - 25
                    }));
                }
            }
        }

        d = this.p.a - this.t.a;
        this.p.a = Math.max(0.1, this.p.a - (d * 0.05));
        d = this.p.z - this.t.z;
        this.p.z = Math.max(1, this.p.z - (d * 0.05));
    },
    distanceTo: function (n, details) {
        var dx = this.p.x - n.x,
            dy = this.p.y - n.y,
            d = Math.sqrt(dx * dx + dy * dy);

        return details ? [dx, dy, d] : d;
    },
    move: function (p, avoidStatic) {
        if (!avoidStatic || (avoidStatic && this.distanceTo(p) > 1)) {
            this.q.push(p);
        }
    },
    render: function () {
        this._update();
        this._draw();
    }
};


S.ShapeBuilder = (function () {
    var gap = if_mobile? 7 : 13 , // 控制采样步长数字越小图像点越密
        shapeCanvas = document.createElement('canvas'),
        shapeContext = shapeCanvas.getContext('2d'),
        fontSize = 500,
        fontFamily = 'Avenir, Helvetica Neue, Helvetica, Arial, sans-serif';

    function fit() {
        shapeCanvas.width = Math.floor(window.innerWidth / gap) * gap;
        shapeCanvas.height = Math.floor(window.innerHeight / gap) * gap;
        shapeContext.fillStyle = 'red';
        shapeContext.textBaseline = 'middle';
        shapeContext.textAlign = 'center';
    }

    function processCanvas() {
        var pixels = shapeContext.getImageData(0, 0, shapeCanvas.width, shapeCanvas.height).data;
        dots = [],
            pixels,
            x = 0,
            y = 0,
            fx = shapeCanvas.width,
            fy = shapeCanvas.height,
            w = 0,
            h = 0;

        for (var p = 0; p < pixels.length; p += (4 * gap)) {
            if (pixels[p + 3] > 0) {
                dots.push(new S.Point({
                    x: x,
                    y: y
                }));

                w = x > w ? x : w;
                h = y > h ? y : h;
                fx = x < fx ? x : fx;
                fy = y < fy ? y : fy;
            }

            x += gap;

            if (x >= shapeCanvas.width) {
                x = 0;
                y += gap;
                p += gap * 4 * shapeCanvas.width;
            }
        }

        return {dots: dots, w: w + fx, h: h + fy};
    }

    function setFontSize(s) {
        shapeContext.font = 'bold ' + s + 'px ' + fontFamily;
    }

    function isNumber(n) {
        return !isNaN(parseFloat(n)) && isFinite(n);
    }

    function init() {
        fit();
        window.addEventListener('resize', fit);
    }

    init();

    return {
        imageFile: function (url, callback) {
            var image = new Image(),
                a = S.Drawing.getArea();

            image.onload = function () {
                shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
                shapeContext.drawImage(this, 0, 0, a.h * 0.6, a.h * 0.6);
                callback(processCanvas());
            };

            image.onerror = function () {
                callback(S.ShapeBuilder.letter('What?'));
            };

            image.src = url;
        },
        circle: function (d) {
            var r = Math.max(0, d) / 2;
            shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
            shapeContext.beginPath();
            shapeContext.arc(r * gap, r * gap, r * gap, 0, 2 * Math.PI, false);
            shapeContext.fill();
            shapeContext.closePath();

            return processCanvas();
        },
        letter: function (l) {
            var s = 0;

            setFontSize(fontSize);
            // 控制字体大小
            s = Math.min(fontSize,
                (shapeCanvas.width / shapeContext.measureText(l).width) * 0.8 * fontSize,
                (shapeCanvas.height / fontSize) * (isNumber(l) ? 1 : 0.45) * fontSize);
            setFontSize(s);

            shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
            shapeContext.fillText(l, shapeCanvas.width / 2, shapeCanvas.height / 2);

            return processCanvas();
        },
        rectangle: function (w, h) {
            var dots = [],
                width = gap * w,
                height = gap * h;

            for (var y = 0; y < height; y += gap) {
                for (var x = 0; x < width; x += gap) {
                    dots.push(new S.Point({
                        x: x,
                        y: y
                    }));
                }
            }

            return {dots: dots, w: width, h: height};
        }
    };
}());


S.Shape = (function () {
    var dots = [],
        width = 0,
        height = 0,
        cx = 0,
        cy = 0;

    function compensate() {
        var a = S.Drawing.getArea();

        cx = a.w / 2 - width / 2;
        cy = a.h / 2 - height / 2;
    }

    return {
        shuffleIdle: function () {
            var a = S.Drawing.getArea();

            for (var d = 0; d < dots.length; d++) {
                if (!dots[d].s) {
                    dots[d].move({
                        x: Math.random() * a.w,
                        y: Math.random() * a.h
                    });
                }
            }
        },
        switchShape: function (n, fast) {
            var size,
                a = S.Drawing.getArea();

            width = n.w;
            height = n.h;

            compensate();

            if (n.dots.length > dots.length) {
                size = n.dots.length - dots.length;
                for (var d = 1; d <= size; d++) {
                    dots.push(new S.Dot(a.w / 2, a.h / 2));
                }
            }

            var d = 0,
                i = 0;

            while (n.dots.length > 0) {
                i = Math.floor(Math.random() * n.dots.length);
                dots[d].e = fast ? 0.25 : (dots[d].s ? 0.14 : 0.11);

                if (dots[d].s) {
                    dots[d].move(new S.Point({
                        z: Math.random() * 20 + 10,
                        a: Math.random(),
                        h: 18
                    }));
                } else {
                    dots[d].move(new S.Point({
                        z: Math.random() * 5 + 5,
                        h: fast ? 18 : 30
                    }));
                }

                dots[d].s = true;
                // 控制文字园点大小 z
                dots[d].move(new S.Point({
                    x: n.dots[i].x + cx,
                    y: n.dots[i].y + cy,
                    a: 1,
                    z: if_mobile? 2.3 : 5,
                    h: 0
                }));

                n.dots = n.dots.slice(0, i).concat(n.dots.slice(i + 1));
                d++;
            }

            for (var i = d; i < dots.length; i++) {
                if (dots[i].s) {
                    dots[i].move(new S.Point({
                        z: Math.random() * 20 + 10,
                        a: Math.random(),
                        h: 20
                    }));

                    dots[i].s = false;
                    dots[i].e = 0.04;
                    dots[i].move(new S.Point({
                        x: Math.random() * a.w,
                        y: Math.random() * a.h,
                        a: 0.3, //.4
                        z: Math.random() * 4,
                        h: 0
                    }));
                }
            }
        },
        render: function () {
            for (var d = 0; d < dots.length; d++) {
                dots[d].render();
            }
        }
    };
}());

function show_date_time() {
    window.setTimeout("show_date_time()", 1000);
    BirthDay = new Date(meet_time);//这个日期是可以修改的
    console.log(BirthDay)
    today = new Date();
    timeold = (today.getTime() - BirthDay.getTime());
    sectimeold = timeold / 1000
    secondsold = Math.floor(sectimeold);
    msPerDay = 24 * 60 * 60 * 1000
    e_daysold = timeold / msPerDay
    daysold = Math.floor(e_daysold);
    e_hrsold = (e_daysold - daysold) * 24;
    hrsold = Math.floor(e_hrsold);
    e_minsold = (e_hrsold - hrsold) * 60;
    minsold = Math.floor((e_hrsold - hrsold) * 60);
    seconds = Math.floor((e_minsold - minsold) * 60);
    span_dt_dt.innerHTML = daysold + "天" + hrsold + "小时" + minsold + "分" + seconds + "秒";
}
show_date_time();

S.init()