Heim >Web-Frontend >H5-Tutorial >HTML5 Canvas implementiert Feuerwerks-Spezialeffekte. HTML5-Tutorial-Fähigkeiten

HTML5 Canvas implementiert Feuerwerks-Spezialeffekte. HTML5-Tutorial-Fähigkeiten

WBOYOriginal: 2016-05-16 15:45:413022Durchsuche

Dieser Artikel stellt Ihnen einen kostenlosen, sicheren und umweltfreundlichen Feuerwerks-Spezialeffekt vor, der in HTML5 Canvas implementiert ist.

Der Effekt ist wie folgt:

Der Code lautet wie folgt:

XML/HTML-CodeInhalt in die Zwischenablage kopieren

>
<html>
<Kopf>
<title>Canvas 实现放烟花特效Titel>
<meta charset="utf- 8">
<meta http-equiv=" X-UA-kompatibel“ Inhalt="IE=edge">
<meta name="viewport" Inhalt="width=device-width,height=device-height,inital-scale=1.0,maximum-scale=1.0 ,user-scalable=no">
<Stil Typ="text/ css">
html,body{height:100%;margin:0;padding:0}
ul,li{text-indent:0;text-decoration:none;margin:0;padding:0}
img{border:0}
body{background-color:#000;color:#999;font:100%/18px helvetica, arial, serif}
canvas{cursor:crosshair;display:block;left:0;position:absolute;top:0;z-index:20}
#header img{width:100%; Höhe: 20 %;}
#bg img{width:100%; Höhe: 80 %;}
#header,#bg{position:fixed;left:0;right:0;z-index:10}
#header{top:0}
#bg{position:fixed;z-index:1;bottom:0}
audio{position:fixed;display:none;bottom:0;left:0;right:0;width:100%;z-index:5}
Stil>
Kopf>
<Körper>
<div id="bg" >
<img id="bgimg" src="http://img.ivsky.com/img/tupian/pre/201508/02/yuzhou_xingkong_yu_yueliang-006 .jpg">
div>
<script src="http: //cdn.bootcss.com/jquery/2.2.0/jquery.min.js">script >
<Skript>
$(function(){
var Feuerwerk = Funktion(){
var self = this;
// 产生烟花随机数
var rand = Funktion(rMi, rMa){
//按位取反运算符
return ~~((Math.random()*(rMa-rMi 1)) rMi);
},hitTest = function(x1, y1, w1, h1, x2, y2, w2, h2){
return !(x1 w1 < x2 || x2 w2 < x1 || y1 h1 < y2 || . y2 h2 < y1);
};
//请求动画帧
window.requestAnimFrame=function(){
return window.requestAnimationFrame
||window.webkitRequestAnimationFrame
||window.mozRequestAnimationFrame
||window.oRequestAnimationFrame
||window.msRequestAnimationFrame
||function(callback){
window.setTimeout(callback,1000/60);
}
}();
self.init = function(){
self.canvas = document.createElement('canvas');
//Leinwand 全屏
selfself.canvas.width = self.cw = $(window ).innerWidth();
selfself.canvas.height = self.ch = $(window ).innerHeight();
self.particles = [];
self.partCount = 150;
self.fireworks = [];
selfself.mx = self.cw/2;
selfself.my = self.ch/2;
self.currentHue = 30;
self.partSpeed = 5;
self.partSpeedVariance = 10;
self.partWind = 50;
self.partFriction = 5;
self.partGravity = 1;
self.hueMin = 0;
self.hueMax = 360;
self.fworkSpeed = 4;
self.fworkAccel = 10;
self.hueVariance = 30;
self.flickerDensity = 25;
self.showShockwave = true;
self.showTarget = false;
self.clearAlpha = 25;
$(document.body).append(self.canvas);
selfself.ctx = self.canvas.getContext('2d');
self.ctx.lineCap = 'round';
self.ctx.lineJoin = 'round';
self.lineWidth = 1;
self.bindEvents();
self.canvasLoop();
self.canvas.onselectstart = function() {
return false;
};
};
// 创建粒子
self.createParticles = Funktion(x,y, hue){
var Countdown = self.partCount;
while(countdown--){
var newParticle = {
x: x,
y: y,
coordLast: [
{x: x, y: y},
{x: x, y: y},
{x: x, y: y}
],
Winkel: rand(0, 360),
speed: rand(((self.partSpeed - self.partSpeedVariance) <= 0) ? 1 : self.partSpeed - self.partSpeedVariance, (self .partSpeed self.partSpeedVariance)),
Reibung: 1 - self.partFriction/100,
Schwerkraft: self.partGravity/2,
hue: rand(hue-self.hueVariance, hue self.hueVariance),
Helligkeit: rand(50, 80),
alpha: rand(40.100)/100,
Zerfall: rand(10, 50)/1000,
wind: (rand(0, self.partWind) - (self.partWind/2))/25,
lineWidth: self.lineWidth
};
self.particles.push(newParticle);
}
};
// 更新粒子
self.updateParticles = function(){
var i = self.particles.length;
while(i--){
var p = self.particles[i];
var radians = p.angle * Math.PI / 180;
var vx = Math.cos(radians) * p.speed;
var vy = Math.sin(radians) * p.speed;
p.speed *= p.friction;
p.coordLast[2].x = p.coordLast[1].x;
p.coordLast[2].y = p.coordLast[1].y;
p.coordLast[1].x = p.coordLast[0].x;
p.coordLast[1].y = p.coordLast[0].y;
p.coordLast[0].x = p.x;
p.coordLast[0].y = p.y;
p.x = vx;
p.y = vy;
p.y = p.gravity;
p.angle = p.wind;
p.alpha -= p.decay;
if(!hitTest(0,0,self.cw,self.ch,p.x-p.radius, p.y-p.radius, p.radius*2, p.radius*2) || p .alpha < .05){
self.particles.splice(i, 1);
}
};
};
// 绘制粒子
self.drawParticles = function(){
var i = self.particles.length;
while(i--){
var p = self.particles[i];
var coordRand = (rand(1,3)-1);
self.ctx.beginPath();
self.ctx.moveTo(Math.round(p.coordLast[coordRand].x), Math.round(p.coordLast[coordRand].y));
self.ctx.lineTo(Math.round(p.x), Math.round(p.y));
self.ctx.closePath();
self.ctx.StrokeStyle = 'hsla(' p.hue ', 100%, ' p .brightness '%, ' p.alpha ')';
self.ctx.Stroke();
if(self.flickerDensity > 0){
var inverseDensity = 50 - self.flickerDensity;
if(rand(0, inverseDensity) === inverseDensity){
self.ctx.beginPath();
self.ctx.arc(Math.round(p.x), Math.round(p.y), rand(p.lineWidth,p.lineWidth 3)/2, 0, Math.PI*2, false)
self.ctx.closePath();
var randrandAlpha = rand(50,100)/100;
self.ctx.fillStyle = 'hsla(' p.hue ', 100%, ' p .brightness '%, ' randAlpha ')';
self.ctx.fill();
}
}
};
};
// 创建烟花
self.createFireworks = function(startX, startY, targetX, targetY){
var newFirework = {
x: startX,
y: startY,
startX: startX,
startY: startY,
hitX: false,
hitY: false,
coordLast: [
{x: startX, y: startY},
{x: startX, y: startY},
{x: startX, y: startY}
],
targetX: targetX,
targetY: targetY,
Geschwindigkeit: self.fworkSpeed,
angle: Math.atan2(targetY - startY, targetX - startX),
shockwaveAngle: Math.atan2(targetY - startY, targetX - startX) (90*(Math.PI/180)),
Beschleunigung: self.fworkAccel/100,
hue: self.currentHue,
Helligkeit: rand(50, 80),
alpha: rand(50.100)/100,
lineWidth: self.lineWidth
};
self.fireworks.push(newFirework);
};
// 更新烟花
self.updateFireworks = function(){
var i = self.fireworks.length;
while(i--){
var f = self.fireworks[i];
self.ctx.lineWidth = f.lineWidth;
vx = Math.cos(f.angle) * f.speed,
vy = Math.sin(f.angle) * f.speed;
f.speed *= 1 f.acceleration;
f.coordLast[2].x = f.coordLast[1].x;
f.coordLast[2].y = f.coordLast[1].y;
f.coordLast[1].x = f.coordLast[0].x;
f.coordLast[1].y = f.coordLast[0].y;
f.coordLast[0].x = f.x;
f.coordLast[0].y = f.y;
if(f.startX >= f.targetX){
if(f.x vx <= f.targetX){
ff.x = f.targetX;
f.hitX = true;
} else {
f.x = vx;
}
} else {
if(f.x vx >= f.targetX){
ff.x = f.targetX;
f.hitX = true;
} else {
f.x = vx;
}
}
if(f.startY >= f.targetY){
if(f.y vy <= f.targetY){
ff.y = f.targetY;
f.hitY = true;
} else {
f.y = vy;
}
} else {
if(f.y vy >= f.targetY){
ff.y = f.targetY;
f.hitY = true;
} else {
f.y = vy;
}
}
if(f.hitX && f.hitY){
self.createParticles(f.targetX, f.targetY, f.hue);
self.fireworks.splice(i, 1);
}
};
};
// 绘制烟花
self.drawFireworks = function(){
var i = self.fireworks.length;
self.ctx.globalCompositeOperation = 'lighter';
while(i--){
var f = self.fireworks[i];
self.ctx.lineWidth = f.lineWidth;
var coordRand = (rand(1,3)-1);
self.ctx.beginPath();
self.ctx.moveTo(Math.round(f.coordLast[coordRand].x), Math.round(f.coordLast[coordRand].y));
self.ctx.lineTo(Math.round(f.x), Math.round(f.y));
self.ctx.closePath();
self.ctx.StrokeStyle = 'hsla(' f.hue ', 100%, ' f .brightness '%, ' f.alpha ')';
self.ctx.Stroke();
if(self.showTarget){
self.ctx.save();
self.ctx.beginPath();
self.ctx.arc(Math.round(f.targetX), Math.round(f.targetY), rand(1,8), 0, Math.PI*2, false)
self.ctx.closePath();
self.ctx.lineWidth = 1;
self.ctx.Stroke();
self.ctx.restore();
}
if(self.showShockwave){
self.ctx.save();
self.ctx.translate(Math.round(f.x), Math.round(f.y));
self.ctx.rotate(f.shockwaveAngle);
self.ctx.beginPath();
self.ctx.arc(0, 0, 1*(f.speed/5), 0, Math.PI, true);
self.ctx.StrokeStyle = 'hsla(' f.hue ', 100%, ' f .brightness '%, ' rand(25, 60)/100 ')';
self.ctx.lineWidth = f.lineWidth;
self.ctx.Stroke();
self.ctx.restore();
}
};
};
// 绑定事件
self.bindEvents = Funktion(){
$(window).on('resize', function(){
clearTimeout(self.timeout);
self.timeout = setTimeout(function() {
selfself.canvas.width = self.cw = $(window ).innerWidth();
selfself.canvas.height = self.ch = $(window ).innerHeight();
self.ctx.lineCap = 'round';
self.ctx.lineJoin = 'round';
}, 100);
});
$(self.canvas).on('mousedown', function(e){
self.mx = e.pageX - self.canvas.offsetLeft;
self.my = e.pageY - self.canvas.offsetTop;
self.currentHue = rand(self.hueMin, self.hueMax);
self.createFireworks(self.cw/2, self.ch, self.mx, self.my);
$(self.canvas).on('mousemove.fireworks', function(e){
self.mx = e.pageX - self.canvas.offsetLeft;
self.my = e.pageY - self.canvas.offsetTop;
self.currentHue = rand(self.hueMin, self.hueMax);
self.createFireworks(self.cw/2, self.ch, self.mx, self.my);
});
});
$(self.canvas).on('mouseup', function(e){
$(self.canvas).off('mousemove.fireworks');
});
};
self.clear = Funktion(){
self.particles = [];
self.fireworks = [];
self.ctx.clearRect(0, 0, self.cw, self.ch);
};
self.canvasLoop = function(){
requestAnimFrame(self.canvasLoop, self.canvas);
self.ctx.globalCompositeOperation = 'destination-out';
self.ctx.fillStyle = 'rgba(0,0,0,' self.clearAlpha/ 100 ')';
self.ctx.fillRect(0,0,self.cw,self.ch);
self.updateFireworks();
self.updateParticles();
self.drawFireworks();
self.drawParticles();
};
self.init();
}
var fworks = nouveau Feux d'artifice();
$('#info-toggle').on('clic', function(e){
$('#info-inner').stop(false, true).slideToggle(100);
e.preventDefault();
});
});
script>
<toile largeur="1400" hauteur="449">toile>
corps>
html>

是不是被HTML5强大的效果惊呆了，一饱眼福了吧。

Stellungnahme：

Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn

Vorheriger Artikel：HTML5 Canvas-Einführungslern-Tutorial_HTML5-Tutorial-FähigkeitenNächster Artikel：HTML5 Canvas-Einführungslern-Tutorial_HTML5-Tutorial-Fähigkeiten

In Verbindung stehende Artikel

Mehr sehen