In diesem Artikel wird hauptsächlich Canvas vorgestellt und vorgestellt, um schillernde Partikelbewegungseffekte zu erzielen (Partikel erzeugen Text). Der Herausgeber findet es ziemlich gut, daher werde ich es jetzt mit Ihnen teilen und als Referenz angeben. Folgen wir dem Herausgeber und schauen wir uns das an. Ich hoffe, es kann allen helfen.
Gehen Sie direkt zum Code. Wenn Sie ihn nicht verstehen, können Sie die Codekommentare lesen. Sie werden wahrscheinlich die allgemeine Idee verstehen.
HTML-Code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Canvas 实现炫丽的粒子运动效果-云库前端</title>
<style>
* {
margin: 0;
padding: 0;
}
html,
body {
width: 100%;
height: 100%;
}
canvas {
display: block;
background: #000;
}
body::-webkit-scrollbar{
display: none;
}
.operator-box{
position: fixed;
top: 0;
left: 50%;
border: 1px solid #fff;
background: rgba(255,255,255,0.5);
padding: 20px 10px;
-webkit-transform: translateX(-50%);
transform: translateX(-50%);
}
.back-type,.back-animate{
margin-right: 20px;
}
.flex-box{
display: flex;
justify-content: center;
align-items: center;
}
#input-text{
line-height: 35px;
width: 260px;
height: 35px;
background: rgba(0, 0, 0,0.7);
color: #fff;
font-size: 16px;
border: none;
outline: none;
text-indent: 12px;
box-shadow: inset 0 0 12px 1px rgba(0,0,0,0.7);
}
#input-text::placeholder{
color: #ccc;
line-height: 55px;
height: 55px;
}
select{
-webkit-appearance: none;
-moz-appearance: none;
appearance: none;
border: none;
padding: 0px 20px 0px 6px;
height: 35px;
color: #fff;
text-align: left;
background: rgba(0, 0, 0,0.7) url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAICAYAAAAx8TU7AAAAOUlEQ…R4gPgWEIMAiOYBCS4C8ZDAIrBq4gigNkztQEFMi6AuQHESAPMeXiEMiWfpAAAAAElFTkSuQmCC) no-repeat 190px 12px;
background-size: 5px 8px;
box-shadow: inset 0 0 12px 1px rgba(0,0,0,0.7);
}
</style>
</head>
<body>
<p class="operator-box">
<p class="flex-box">
<p class="back-type">散开类型：
<select name="" id="selectType">
<option value="back">归位</option>
<option value="auto">随机</option>
</select>
</p>
<p class="back-animate">散开效果（对归位有效）：
<select class="back-dynamics" id="selectDynamics">
<option value="spring">dynamics.spring</option>
<option value="bounce">dynamics.bounce</option>
<option value="forceWithGravity">dynamics.forceWithGravity</option>
<option value="gravity">dynamics.gravity</option>
<option value="easeInOut">dynamics.easeInOut</option>
<option value="easeIn">dynamics.easeIn</option>
<option value="easeOut">dynamics.easeOut</option>
<option value="linear">dynamics.linear</option>
</select>
</p>
<p class="input-box"><input type="text" placeholder="输入汉字后回车" id="input-text"></p>
</p>
</p>
<script src="dynamics.min.js"></script>
<script src="index.js"></script>
<script>
var iCircle = new Circle();
</script>
</body>
</html>HTML-Code ist nicht viel, nur ein paar Bedienelemente. Hier ist es auf einen Blick leicht zu verstehen. Sie müssen nicht zu viele Worte verschwenden. Werfen wir einen Blick auf den Protagonisten-JavaScript-Code dieses Artikels. Bevor wir uns jedoch den Code ansehen, können wir uns genauso gut die Idee anhören, wie dieser Effekt erzielt werden kann:
Zuerst müssen wir eine Reihe von Extras (Partikel) generieren.
Hängen Sie die relevanten Parameter jedes Partikels an einige seiner eigenen Attribute, da jedes Partikel seine eigene Flugbahn hat 🎜>
function Circle() {
var This = this;
this.init();
this.generalRandomParam();
this.drawCircles();
this.ballAnimate();
this.getUserText();
// 窗口改变大小后，生计算并获取画面
window.onresize = function(){
This.stateW = document.body.offsetWidth;
This.stateH = document.body.offsetHeight;
This.iCanvasW = This.iCanvas.width = This.stateW;
This.iCanvasH = This.iCanvas.height = This.stateH;
This.ctx = This.iCanvas.getContext("2d");
}
}
// 初始化
Circle.prototype.init = function(){
//父元素宽高
this.stateW = document.body.offsetWidth;
this.stateH = document.body.offsetHeight;
this.iCanvas = document.createElement("canvas");
// 设置Canvas 与父元素同宽高
this.iCanvasW = this.iCanvas.width = this.stateW;
this.iCanvasH = this.iCanvas.height = this.stateH;
// 获取 2d 绘画环境
this.ctx = this.iCanvas.getContext("2d");
// 插入到 body 元素中
document.body.appendChild(this.iCanvas);
this.iCanvasCalculate = document.createElement("canvas");
// 用于保存计算文字宽度的画布
this.mCtx = this.iCanvasCalculate.getContext("2d");
this.mCtx.font = "128px 微软雅黑";
this.iCanvasPixel = document.createElement("canvas");
this.iCanvasPixel.setAttribute("style","position:absolute;top:0;left:0;");
this.pCtx = null; // 用于绘画文字的画布
// 随机生成圆的数量
this.ballNumber = ramdomNumber(1000, 2000);
// 保存所有小球的数组
this.balls = [];
// 保存动画中最后一个停止运动的小球
this.animte = null;
this.imageData = null;
this.textWidth = 0; // 保存生成文字的宽度
this.textHeight = 150; // 保存生成文字的高度
this.inputText = ""; // 保存用户输入的内容
this.actionCount = 0;
this.ballActor = []; // 保存生成文字的粒子
this.actorNumber = 0; // 保存生成文字的粒子数量
this.backType = "back"; // 归位
this.backDynamics = ""; // 动画效果
this.isPlay = false; // 标识（在生成文字过程中，不能再生成）
}
// 渲染出所有圆
Circle.prototype.drawCircles = function () {
for(var i=0;i<this.ballNumber;i++){
this.renderBall(this.balls[0]);
}
}
// 获取用户输入文字
Circle.prototype.getUserText = function(){
This = this; // 保存 this 指向
ipu = document.getElementById("input-text");
ipu.addEventListener("keydown",function(event){
if(event.which === 13){ // 如果是回车键
ipu.value = ipu.value.trim(); // 去头尾空格
var pat = /[\u4e00-\u9fa5]/; // 中文判断
var isChinese = pat.test(ipu.value);
if(ipu.value.length !=0 && isChinese){
This.inputText = ipu.value;
}else{
alert("请输入汉字");
return;
}
if(This.isPlay){
return
}
This.getAnimateType();
This.getTextPixel();
This.isPlay = true;
}
});
}
// 计算文字的宽
Circle.prototype.calculateTextWidth = function () {
this.textWidth = this.mCtx.measureText(this.inputText).width;
}
// 获取文字像素点
Circle.prototype.getTextPixel = function () {
if(this.pCtx){
this.pCtx.clearRect(0,0,this.textWidth,this.textHeight);
}
this.calculateTextWidth(this.inputText);
this.iCanvasPixel.width = this.textWidth;
this.iCanvasPixel.height = this.textHeight;
this.pCtx = this.iCanvasPixel.getContext("2d");
this.pCtx.font = "128px 微软雅黑";
this.pCtx.fillStyle = "#FF0000";
this.pCtx.textBaseline = "botom";
this.pCtx.fillText(this.inputText,0,110);
this.imageData = this.pCtx.getImageData(0,0,this.textWidth,this.textHeight).data;
this.getTextPixelPosition(this.textWidth,this.textHeight);
}
// 获取文字粒子像素点位置
Circle.prototype.getTextPixelPosition = function (width,height) {
var left = (this.iCanvasW - width)/2;
var top = (this.iCanvasH - height)/2;
var space = 4;
this.actionCount = 0;
for(var i=0;i<this.textHeight;i+=space){
for(var j=0;j<this.textWidth;j+=space){
var index = j*space+i*this.textWidth*4;
if(this.imageData[index] == 255){
if(this.actionCount<this.ballNumber){
this.balls[this.actionCount].status = 1;
this.balls[this.actionCount].targetX = left+j;
this.balls[this.actionCount].targetY = top+i;
this.balls[this.actionCount].backX = this.balls[this.actionCount].x;
this.balls[this.actionCount].backY = this.balls[this.actionCount].y;
this.ballActor.push(this.balls[this.actionCount]);
this.actionCount++;
}
}
}
this.actorNumber = this.ballActor.length;
}
this.animateToText();
}
// 粒子运动到指定位置
Circle.prototype.animateToText = function(){
for(var i=0;i<This.actorNumber;i++){
dynamics.animate(This.ballActor[i], {
x: this.ballActor[i].targetX,
y: this.ballActor[i].targetY
},{
type: dynamics.easeIn,
duration: 1024,
});
}
setTimeout(function(){
This.ballbackType();
},3000);
}
// 粒子原路返回
Circle.prototype.ballBackPosition = function(){
for(var i=0;i<This.actorNumber;i++){
var ball = This.ballActor[i];
dynamics.animate(ball, {
x: ball.backX,
y: ball.backY
},{
type: dynamics[this.backDynamics],
duration: 991,
complete:this.changeStatus(ball)
});
}
}
// 获取类型|动画效果
Circle.prototype.getAnimateType = function() {
var selectType = document.getElementById("selectType");
var selectDynamics = document.getElementById("selectDynamics");
this.backType = selectType.options[selectType.options.selectedIndex].value;
this.backDynamics = selectDynamics.options[selectDynamics.options.selectedIndex].value;
}
// 复位散开
Circle.prototype.ballbackType = function(){
if(this.backType == "back"){
this.ballBackPosition();
}else{
this.ballAutoPosition();
}
this.ballActor = [];
}
// 随机散开
Circle.prototype.ballAutoPosition = function(ball){
for(var i=0;i<this.actorNumber;i++){
this.changeStatus(this.ballActor[i])
}
}
// 更改小球状态
Circle.prototype.changeStatus = function(ball){
ball.status = 0;
if(this.isPlay == true){
this.isPlay = false;
}
}
// 随机生成每个圆的相关参数
Circle.prototype.generalRandomParam = function(){
for(var i=0;i<this.ballNumber;i++){
var ball = {};
ball.size = 1; // 随机生成圆半径
// 随机生成圆心 x 坐标
ball.x = ramdomNumber(0+ball.size, this.iCanvasW-ball.size);
ball.y = ramdomNumber(0+ball.size, this.iCanvasH-ball.size);
ball.speedX = ramdomNumber(-1, 1);
ball.speedY = ramdomNumber(-1, 1);
this.balls.push(ball);
ball.status = 0;
ball.targetX = 0;
ball.targetY = 0;
ball.backX = 0;
ball.backY = 0;
}
}
// 改变圆的位置
Circle.prototype.changeposition = function(){
for(var i=0;i<this.ballNumber;i++){
if( this.balls[i].status == 0){
this.balls[i].x += this.balls[i].speedX;
this.balls[i].y += this.balls[i].speedY;
}
}
}
// 画圆
Circle.prototype.renderBall = function(ball){
this.ctx.fillStyle = "#fff";
this.ctx.beginPath(); // 这个一定要加
this.ctx.arc(ball.x, ball.y, ball.size, 0, 2 * Math.PI);
this.ctx.closePath(); // 这个一定要加
this.ctx.fill();
}
// 小球碰撞判断
Circle.prototype.collision = function(ball){
for(var i=0;i<this.ballNumber;i++){
if(ball.x>this.iCanvasW-ball.size || ball.x<ball.size){
if(ball.x>this.iCanvasW-ball.size){
ball.x = this.iCanvasW-ball.size;
}else{
ball.x = ball.size;
}
ball.speedX = - ball.speedX;
}
if(ball.y>this.iCanvasH-ball.size || ball.y<ball.size){
if(ball.y>this.iCanvasH-ball.size){
ball.y = this.iCanvasH-ball.size;
}else{
ball.y = ball.size;
}
ball.speedY = - ball.speedY;
}
}
}
// 开始动画
Circle.prototype.ballAnimate = function(){
var This = this;
var animateFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
(function move(){
animte = animateFrame(move);
This.ctx.clearRect(0, 0, This.iCanvasW, This.iCanvasH);
This.changeposition();
for(var i=0;i<This.ballNumber;i++){
This.collision(This.balls[i]);
This.renderBall(This.balls[i]);
}
})();
}
// 生成一个随机数
function ramdomNumber(min, max) {
return Math.random() * (max - min) + min;
}Tutorial zur Verwendung von Canvas in HTML5 kombiniert mit Formeln zum Zeichnen von Partikelbewegungen_HTML5-Tutorial-Fähigkeiten
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