历史版本9 :JS 实现文字雪花效果 返回文档
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1.描述编辑
本篇文档主要是为了实现 FineReport 集成文字雪花特效，大家可以根据自己的要求对代码进行修改，直接修改文字就可以，展现自己想说的话，效果图如下：
2. 实现思路编辑
利用 HTIML5 技术就可以实现给文字添加特效，主要是用于酷炫的文字页面，里面也有集成时间以及图片和文字等代码，效果和功能强大，可以参考学习研究
3. 操作步骤／示例编辑
3.1 新建模板
3.1.1 首先在 FineReport 新建一张普通报表
在报表内合并单元格，并在单元格输入以下代码，然后用 HTML 显示，效果如下图：
代码如下：
<div class="cs"> <img src="/webroot/scripts/css/Kevin.jpg" id="logo"> </div> <canvas class="canvas" width="1020" height="800"></canvas> <p class="text" style="color: #ed3073;"> 我已经度过了 <br/> <span id="span_dt_dt"></span> </p> <p class="text" style="color: #ed3073;" id="text"> 我希望余生可以慢点 <br/> <span id="span_dt_dt1"></span> </p>
3.1.2 其次将中间头像引入
事先要将图片（本人微信头像）：
放入路径：FineReport_10.0\webapps\webroot\scripts\css下，文件名字是Kevin.jpg
3.2 引入 CSS
点击模板Web属性-引用 CSS-选择，将文字效果.css 加入列表
事先要将文字效果.css 放到D:\soft\FineReport_10.0\webapps\webroot\scripts\css路径下，然后用上面的方法引用。
文件：
注意：放进去的时候名字是：文字效果.css
3.3 添加主要事件代码
点击模板Web属性-数据分析设置，增加加载结束事件，事件的JS代码如下图：
代码如下：
function show_date_time() {
window.setTimeout("show_date_time()", 1000);
BirthDay = new Date("2/23/1996 00:00:00");//这个日期是可以修改的
today = new Date();
timeold = (today.getTime() - BirthDay.getTime());//计算出今天到你出生的时间差，毫秒数
sectimeold = timeold / 1000 //日期转化成秒
secondsold = Math.floor(sectimeold);
msPerDay = 24 * 60 * 60 * 1000
e_daysold = timeold / msPerDay
daysold = Math.floor(e_daysold); //度过多少天
e_hrsold = (e_daysold - daysold) * 24;
hrsold = Math.floor(e_hrsold); //度过多少小时
e_minsold = (e_hrsold - hrsold) * 60;
minsold = Math.floor((e_hrsold - hrsold) * 60); //度过多少分钟
seconds = Math.floor((e_minsold - minsold) * 60); //度过多少秒
span_dt_dt.innerHTML = daysold + "天" + hrsold + "小时" + minsold + "分" + seconds + "秒";
}
show_date_time();
//以上模块主要是呈现日期模块，可集成到其他JS代码中
var S = {
init: function () {
S.Drawing.init('.canvas');
document.body.classList.add('body--ready');
//想说的话
S.UI.simulate("zhuzhu | Thanks| --Kevin|#countdown 3|#time");
S.Drawing.loop(function () {
S.Shape.render();
});
}
};//JSON的写法，方便调用里面的变量和function
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);
};//实现重复动画效果的方法，以上封装后可兼容所有浏览器
return {
init: function (el) {
canvas = document.querySelector(el);
context = canvas.getContext('2d');
this.adjustCanvas();
window.addEventListener('resize', function (e) {
S.Drawing.adjustCanvas();
});
},//初始画布
loop: function (fn) {
renderFn = !renderFn ? fn : renderFn;
this.clearFrame();
renderFn();
requestFrame.call(window, this.loop.bind(this));
},//循环动画
adjustCanvas: function () {
canvas.width = window.innerWidth - 100;
canvas.height = window.innerHeight - 30;
},//设置屏幕自适应画布
clearFrame: function () {
context.clearRect(0, 0, canvas.width, canvas.height);
},//清空画布
getArea: function () {
return {w: canvas.width, h: canvas.height};
},//获取画布长宽
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();
}//画小圆
};
}());
S.UI = (function () {
var interval,
currentAction,
time,
maxShapeSize = 30,
sequence = [],
cmd = '#';
function formatTime(date) {
var h = date.getHours(),
m = date.getMinutes(),
m = m < 10 ? '0' + m : m;
return h + ':' + m;
}//获取到小时和分钟时间
function getValue(value) {
return value && value.split(' ')[1];
}//文字分割
function getAction(value) {
value = value && value.split(' ')[0];
return value && value[0] === cmd && value.substring(1);
}//文字处理
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);
}
} 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));
}
}, 2000, sequence.length);
}
return {
simulate: function (action) {
performAction(action);
}//文字处理
};
}());//最终实现文字处理，以及时间，倒计时等处理
S.Point = function (args) {
this.x = args.x;
this.y = args.y;
this.z = args.z;
this.a = args.a;
this.h = args.h;
};//坐标方法
S.Color = function (r, g, b, a) {
this.r = r;
this.g = g;
this.b = b;
this.a = a;
};//颜色方法
S.Color.prototype = {
render: function () {
return 'rgba(' + this.r + ',' + +this.g + ',' + this.b + ',' + this.a + ')';
}
};//颜色调用绘制使用
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 = [];
};//小圆点方法
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();
}
};//小圆点圆形绘制
S.ShapeBuilder = (function () {
var gap = 13,
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
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);
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};
}
};
}());//画布添加图片，文字，圆等设置，这个主要是letter
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;
dots[d].move(new S.Point({
x: n.dots[i].x + cx,
y: n.dots[i].y + cy,
a: 1,
z: 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();
}
}
};
}());//区域圆字小圆的随机分布，转换，添加
S.init();
其中更换文字的地方在代码中有备注
4. 效果查看编辑
4.1 PC 端效果
点击数据分析预览，效果如上图。
4.2 移动端效果
注：不支持移动端