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這篇文章主要講解了“js怎么實現花瓣漫天飛舞特效”，文中的講解內容簡單清晰，易于學習與理解，下面請大家跟著小編的思路慢慢深入，一起來研究和學習“js怎么實現花瓣漫天飛舞特效”吧！
效果：
代碼：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>花瓣漫天飛舞入流水</TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<style>
html, body{
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
}
.container{
width: 100%;
height: 100%;
margin: 0;
padding: 0;
background-color: #000000;
}
</style>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
</HEAD>
<BODY>
<div id="jsi-cherry-container" class="container"></div>
<script>
var RENDERER = {
INIT_CHERRY_BLOSSOM_COUNT : 30,
MAX_ADDING_INTERVAL : 10,
init : function(){
this.setParameters();
this.reconstructMethods();
this.createCherries();
this.render();
},
setParameters : function(){
this.$container = $('#jsi-cherry-container');
this.width = this.$container.width();
this.height = this.$container.height();
this.context = $('<canvas />').attr({width : this.width, height : this.height}).appendTo(this.$container).get(0).getContext('2d');
this.cherries = [];
this.maxAddingInterval = Math.round(this.MAX_ADDING_INTERVAL * 1000 / this.width);
this.addingInterval = this.maxAddingInterval;
},
reconstructMethods : function(){
this.render = this.render.bind(this);
},
createCherries : function(){
for(var i = 0, length = Math.round(this.INIT_CHERRY_BLOSSOM_COUNT * this.width / 1000); i < length; i++){
this.cherries.push(new CHERRY_BLOSSOM(this, true));
}
},
render : function(){
requestAnimationFrame(this.render);
this.context.clearRect(0, 0, this.width, this.height);
this.cherries.sort(function(cherry1, cherry2){
return cherry1.z - cherry2.z;
});
for(var i = this.cherries.length - 1; i >= 0; i--){
if(!this.cherries[i].render(this.context)){
this.cherries.splice(i, 1);
}
}
if(--this.addingInterval == 0){
this.addingInterval = this.maxAddingInterval;
this.cherries.push(new CHERRY_BLOSSOM(this, false));
}
}
};
var CHERRY_BLOSSOM = function(renderer, isRandom){
this.renderer = renderer;
this.init(isRandom);
};
CHERRY_BLOSSOM.prototype = {
FOCUS_POSITION : 300,
FAR_LIMIT : 600,
MAX_RIPPLE_COUNT : 100,
RIPPLE_RADIUS : 100,
SURFACE_RATE : 0.5,
SINK_OFFSET : 20,
init : function(isRandom){
this.x = this.getRandomValue(-this.renderer.width, this.renderer.width);
this.y = isRandom ? this.getRandomValue(0, this.renderer.height) : this.renderer.height * 1.5;
this.z = this.getRandomValue(0, this.FAR_LIMIT);
this.vx = this.getRandomValue(-2, 2);
this.vy = -2;
this.theta = this.getRandomValue(0, Math.PI * 2);
this.phi = this.getRandomValue(0, Math.PI * 2);
this.psi = 0;
this.dpsi = this.getRandomValue(Math.PI / 600, Math.PI / 300);
this.opacity = 0;
this.endTheta = false;
this.endPhi = false;
this.rippleCount = 0;
var axis = this.getAxis(),
theta = this.theta + Math.ceil(-(this.y + this.renderer.height * this.SURFACE_RATE) / this.vy) * Math.PI / 500;
theta %= Math.PI * 2;
this.offsetY = 40 * ((theta <= Math.PI / 2 || theta >= Math.PI * 3 / 2) ? -1 : 1);
this.thresholdY = this.renderer.height / 2 + this.renderer.height * this.SURFACE_RATE * axis.rate;
this.entityColor = this.renderer.context.createRadialGradient(0, 40, 0, 0, 40, 80);
this.entityColor.addColorStop(0, 'hsl(330, 70%, ' + 50 * (0.3 + axis.rate) + '%)');
this.entityColor.addColorStop(0.05, 'hsl(330, 40%,' + 55 * (0.3 + axis.rate) + '%)');
this.entityColor.addColorStop(1, 'hsl(330, 20%, ' + 70 * (0.3 + axis.rate) + '%)');
this.shadowColor = this.renderer.context.createRadialGradient(0, 40, 0, 0, 40, 80);
this.shadowColor.addColorStop(0, 'hsl(330, 40%, ' + 30 * (0.3 + axis.rate) + '%)');
this.shadowColor.addColorStop(0.05, 'hsl(330, 40%,' + 30 * (0.3 + axis.rate) + '%)');
this.shadowColor.addColorStop(1, 'hsl(330, 20%, ' + 40 * (0.3 + axis.rate) + '%)');
},
getRandomValue : function(min, max){
return min + (max - min) * Math.random();
},
getAxis : function(){
var rate = this.FOCUS_POSITION / (this.z + this.FOCUS_POSITION),
x = this.renderer.width / 2 + this.x * rate,
y = this.renderer.height / 2 - this.y * rate;
return {rate : rate, x : x, y : y};
},
renderCherry : function(context, axis){
context.beginPath();
context.moveTo(0, 40);
context.bezierCurveTo(-60, 20, -10, -60, 0, -20);
context.bezierCurveTo(10, -60, 60, 20, 0, 40);
context.fill();
for(var i = -4; i < 4; i++){
context.beginPath();
context.moveTo(0, 40);
context.quadraticCurveTo(i * 12, 10, i * 4, -24 + Math.abs(i) * 2);
context.stroke();
}
},
render : function(context){
var axis = this.getAxis();
if(axis.y == this.thresholdY && this.rippleCount < this.MAX_RIPPLE_COUNT){
context.save();
context.lineWidth = 2;
context.strokeStyle = 'hsla(0, 0%, 100%, ' + (this.MAX_RIPPLE_COUNT - this.rippleCount) / this.MAX_RIPPLE_COUNT + ')';
context.translate(axis.x + this.offsetY * axis.rate * (this.theta <= Math.PI ? -1 : 1), axis.y);
context.scale(1, 0.3);
context.beginPath();
context.arc(0, 0, this.rippleCount / this.MAX_RIPPLE_COUNT * this.RIPPLE_RADIUS * axis.rate, 0, Math.PI * 2, false);
context.stroke();
context.restore();
this.rippleCount++;
}
if(axis.y < this.thresholdY || (!this.endTheta || !this.endPhi)){
if(this.y <= 0){
this.opacity = Math.min(this.opacity + 0.01, 1);
}
context.save();
context.globalAlpha = this.opacity;
context.fillStyle = this.shadowColor;
context.strokeStyle = 'hsl(330, 30%,' + 40 * (0.3 + axis.rate) + '%)';
context.translate(axis.x, Math.max(axis.y, this.thresholdY + this.thresholdY - axis.y));
context.rotate(Math.PI - this.theta);
context.scale(axis.rate * -Math.sin(this.phi), axis.rate);
context.translate(0, this.offsetY);
this.renderCherry(context, axis);
context.restore();
}
context.save();
context.fillStyle = this.entityColor;
context.strokeStyle = 'hsl(330, 40%,' + 70 * (0.3 + axis.rate) + '%)';
context.translate(axis.x, axis.y + Math.abs(this.SINK_OFFSET * Math.sin(this.psi) * axis.rate));
context.rotate(this.theta);
context.scale(axis.rate * Math.sin(this.phi), axis.rate);
context.translate(0, this.offsetY);
this.renderCherry(context, axis);
context.restore();
if(this.y <= -this.renderer.height / 4){
if(!this.endTheta){
for(var theta = Math.PI / 2, end = Math.PI * 3 / 2; theta <= end; theta += Math.PI){
if(this.theta < theta && this.theta + Math.PI / 200 > theta){
this.theta = theta;
this.endTheta = true;
break;
}
}
}
if(!this.endPhi){
for(var phi = Math.PI / 8, end = Math.PI * 7 / 8; phi <= end; phi += Math.PI * 3 / 4){
if(this.phi < phi && this.phi + Math.PI / 200 > phi){
this.phi = Math.PI / 8;
this.endPhi = true;
break;
}
}
}
}
if(!this.endTheta){
if(axis.y == this.thresholdY){
this.theta += Math.PI / 200 * ((this.theta < Math.PI / 2 || (this.theta >= Math.PI && this.theta < Math.PI * 3 / 2)) ? 1 : -1);
}else{
this.theta += Math.PI / 500;
}
this.theta %= Math.PI * 2;
}
if(this.endPhi){
if(this.rippleCount == this.MAX_RIPPLE_COUNT){
this.psi += this.dpsi;
this.psi %= Math.PI * 2;
}
}else{
this.phi += Math.PI / ((axis.y == this.thresholdY) ? 200 : 500);
this.phi %= Math.PI;
}
if(this.y <= -this.renderer.height * this.SURFACE_RATE){
this.x += 2;
this.y = -this.renderer.height * this.SURFACE_RATE;
}else{
this.x += this.vx;
this.y += this.vy;
}
return this.z > -this.FOCUS_POSITION && this.z < this.FAR_LIMIT && this.x < this.renderer.width * 1.5;
}
};
$(function(){
RENDERER.init();
});
</script>
</BODY>
</HTML>感謝各位的閱讀，以上就是“js怎么實現花瓣漫天飛舞特效”的內容了，經過本文的學習后，相信大家對js怎么實現花瓣漫天飛舞特效這一問題有了更深刻的體會，具體使用情況還需要大家實踐驗證。這里是億速云，小編將為大家推送更多相關知識點的文章，歡迎關注！
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