HTML5中怎么用Canvas實(shí)現(xiàn)超炫酷煙花綻放動(dòng)畫(huà)

這篇文章主要介紹了HTML5中怎么用Canvas實(shí)現(xiàn)超炫酷煙花綻放動(dòng)畫(huà)的相關(guān)知識(shí)，內(nèi)容詳細(xì)易懂，操作簡(jiǎn)單快捷，具有一定借鑒價(jià)值，相信大家閱讀完這篇HTML5中怎么用Canvas實(shí)現(xiàn)超炫酷煙花綻放動(dòng)畫(huà)文章都會(huì)有所收獲，下面我們一起來(lái)看看吧。

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HTML代碼：

XML/HTML Code復(fù)制內(nèi)容到剪貼板

HTML的結(jié)構(gòu)非常簡(jiǎn)單，即構(gòu)造了一個(gè)canvas容器，我們會(huì)利用JS在這個(gè)容器中生成一個(gè)Canvas對(duì)象。看最后的JS代碼你就會(huì)知道了。

CSS代碼：

CSS Code復(fù)制內(nèi)容到剪貼板

#canvas-container { background: #000 url(bg.jpg); height: 400px; left: 50%; margin: -200px 0 0 -300px; position: absolute; top: 50%; width: 600px; z-index: 2;

} canvas { cursor: crosshair; display: block; position: relative; z-index: 3;

} canvas:active { cursor: crosshair;

} #skyline { background: url(skyline.png) repeat-x 50% 0; bottombottom: 0; height: 135px; left: 0; position: absolute; width: 100%; z-index: 1;

} #mountains1 { background: url(mountains1.png) repeat-x 40% 0; bottombottom: 0; height: 200px; left: 0; position: absolute; width: 100%; z-index: 1;

} #mountains2 { background: url(mountains2.png) repeat-x 30% 0; bottombottom: 0; height: 250px; left: 0; position: absolute; width: 100%; z-index: 1;

} #gui { rightright: 0; position: fixed; top: 0; z-index: 3;

}

CSS代碼沒(méi)什么特別，主要也就定義一下背景色和邊框之類的。

接下來(lái)是最重要的Javascript代碼。

Javascript代碼：

JavaScript Code復(fù)制內(nèi)容到剪貼板

self.init = function(){

self.dt = 0;

self.oldTime = Date.now();

self.canvas = document.createElement('canvas');

self.canvasContainer = $('#canvas-container'); var canvasContainerDisabled = document.getElementById('canvas-container');

self.canvas.onselectstart = function() { return false;

};

self.canvas.width = self.cw = 600;

self.canvas.height = self.ch = 400;

self.particles = [];

self.partCount = 30;

self.fireworks = [];

self.mx = self.cw/2;

self.my = self.ch/2;

self.currentHue = 170;

self.partSpeed = 5;

self.partSpeedVariance = 10;

self.partWind = 50;

self.partFriction = 5;

self.partGravity = 1;

self.hueMin = 150;

self.hueMax = 200;

self.fworkSpeed = 2;

self.fworkAccel = 4;

self.hueVariance = 30;

self.flickerDensity = 20;

self.showShockwave = false;

self.showTarget = true;

self.clearAlpha = 25;

self.canvasContainer.append(self.canvas);

self.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;

};

這段JS代碼主要是往canvas容器中構(gòu)造一個(gè)Canvas對(duì)象，并且對(duì)這個(gè)canvas對(duì)象的外觀以及動(dòng)畫(huà)屬性作了初始化。

JavaScript Code復(fù)制內(nèi)容到剪貼板

var Particle = function(x, y, hue){ this.x = x; this.y = y; this.coordLast = [

{x: x, y: y},

{x: x, y: y}

]; this.angle = rand(0, 360); this.speed = rand(((self.partSpeed - self.partSpeedVariance) <= 0) ? 1 : self.partSpeed - self.partSpeedVariance, (self.partSpeed + self.partSpeedVariance)); this.friction = 1 - self.partFriction/100; this.gravity = self.partGravity/2; this.hue = rand(hue-self.hueVariance, hue+self.hueVariance); this.brightness = rand(50, 80); this.alpha = rand(40,100)/100; this.decay = rand(10, 50)/1000; this.wind = (rand(0, self.partWind) - (self.partWind/2))/25; this.lineWidth = self.lineWidth;

};

Particle.prototype.update = function(index){ var radians = this.angle * Math.PI / 180; var vx = Math.cos(radians) * this.speed; var vy = Math.sin(radians) * this.speed + this.gravity; this.speed *= this.friction; this.coordLast[2].x = this.coordLast[1].x; this.coordLast[2].y = this.coordLast[1].y; this.coordLast[1].x = this.coordLast[0].x; this.coordLast[1].y = this.coordLast[0].y; this.coordLast[0].x = this.x; this.coordLast[0].y = this.y; this.x += vx * self.dt; this.y += vy * self.dt; this.angle += this.wind; this.alpha -= this.decay; if(!hitTest(0,0,self.cw,self.ch,this.x-this.radius, this.y-this.radius, this.radius*2, this.radius*2) || this.alpha < .05){

self.particles.splice(index, 1);

}

};

Particle.prototype.draw = function(){ var coordRand = (rand(1,3)-1);

self.ctx.beginPath();

self.ctx.moveTo(Math.round(this.coordLast[coordRand].x), Math.round(this.coordLast[coordRand].y));

self.ctx.lineTo(Math.round(this.x), Math.round(this.y));

self.ctx.closePath();

self.ctx.strokeStyle = 'hsla('+this.hue+', 100%, '+this.brightness+'%, '+this.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(this.x), Math.round(this.y), rand(this.lineWidth,this.lineWidth+3)/2, 0, Math.PI*2, false) self.ctx.closePath(); var randAlpha = rand(50,100)/100;

self.ctx.fillStyle = 'hsla('+this.hue+', 100%, '+this.brightness+'%, '+randAlpha+')';

self.ctx.fill();

}

};

這段JS代碼的功能是實(shí)現(xiàn)煙花爆炸后的小顆粒的繪制，從draw方法中可以看出，創(chuàng)建幾個(gè)隨機(jī)點(diǎn)，煙花顆粒即可在這個(gè)范圍的隨機(jī)點(diǎn)中散落。

JavaScript Code復(fù)制內(nèi)容到剪貼板

var Firework = function(startX, startY, targetX, targetY){ this.x = startX; this.y = startY; this.startX = startX; this.startY = startY; this.hitX = false; this.hitY = false; this.coordLast = [

{x: startX, y: startY},

{x: startX, y: startY}

]; this.targetX = targetX; this.targetY = targetY; this.speed = self.fworkSpeed; this.angle = Math.atan2(targetY - startY, targetX - startX); this.shockwaveAngle = Math.atan2(targetY - startY, targetX - startX)+(90*(Math.PI/180)); this.acceleration = self.fworkAccel/100; this.hue = self.currentHue; this.brightness = rand(50, 80); this.alpha = rand(50,100)/100; this.lineWidth = self.lineWidth; this.targetRadius = 1;

};

Firework.prototype.update = function(index){

self.ctx.lineWidth = this.lineWidth;

vx = Math.cos(this.angle) * this.speed,

vy = Math.sin(this.angle) * this.speed; this.speed *= 1 + this.acceleration; this.coordLast[2].x = this.coordLast[1].x; this.coordLast[2].y = this.coordLast[1].y; this.coordLast[1].x = this.coordLast[0].x; this.coordLast[1].y = this.coordLast[0].y; this.coordLast[0].x = this.x; this.coordLast[0].y = this.y; if(self.showTarget){ if(this.targetRadius < 8){ this.targetRadius += .25 * self.dt;

} else { this.targetRadius = 1 * self.dt;

}

} if(this.startX >= this.targetX){ if(this.x + vx <= this.targetX){ this.x = this.targetX; this.hitX = true;

} else { this.x += vx * self.dt;

}

} else { if(this.x + vx >= this.targetX){ this.x = this.targetX; this.hitX = true;

} else { this.x += vx * self.dt;

}

} if(this.startY >= this.targetY){ if(this.y + vy <= this.targetY){ this.y = this.targetY; this.hitY = true;

} else { this.y += vy * self.dt;

}

} else { if(this.y + vy >= this.targetY){ this.y = this.targetY; this.hitY = true;

} else { this.y += vy * self.dt;

}

} if(this.hitX && this.hitY){ var randExplosion = rand(0, 9);

self.createParticles(this.targetX, this.targetY, this.hue);

self.fireworks.splice(index, 1);

}

};

Firework.prototype.draw = function(){

self.ctx.lineWidth = this.lineWidth; var coordRand = (rand(1,3)-1);

self.ctx.beginPath();

self.ctx.moveTo(Math.round(this.coordLast[coordRand].x), Math.round(this.coordLast[coordRand].y));

self.ctx.lineTo(Math.round(this.x), Math.round(this.y));

self.ctx.closePath();

self.ctx.strokeStyle = 'hsla('+this.hue+', 100%, '+this.brightness+'%, '+this.alpha+')';

self.ctx.stroke(); if(self.showTarget){

self.ctx.save();

self.ctx.beginPath();

self.ctx.arc(Math.round(this.targetX), Math.round(this.targetY), this.targetRadius, 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(this.x), Math.round(this.y));

self.ctx.rotate(this.shockwaveAngle);

self.ctx.beginPath();

self.ctx.arc(0, 0, 1*(this.speed/5), 0, Math.PI, true);

self.ctx.strokeStyle = 'hsla('+this.hue+', 100%, '+this.brightness+'%, '+rand(25, 60)/100+')';

self.ctx.lineWidth = this.lineWidth;

self.ctx.stroke();

self.ctx.restore();

}

};

這段JS代碼是創(chuàng)建煙花實(shí)例的，我們也可以從draw方法中看出，當(dāng)我們鼠標(biāo)點(diǎn)擊畫(huà)布中的某點(diǎn)時(shí)，煙花發(fā)射的目的地就在那個(gè)點(diǎn)上。

關(guān)于“HTML5中怎么用Canvas實(shí)現(xiàn)超炫酷煙花綻放動(dòng)畫(huà)”這篇文章的內(nèi)容就介紹到這里，感謝各位的閱讀！相信大家對(duì)“HTML5中怎么用Canvas實(shí)現(xiàn)超炫酷煙花綻放動(dòng)畫(huà)”知識(shí)都有一定的了解，大家如果還想學(xué)習(xí)更多知識(shí)，歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。

文章標(biāo)題：HTML5中怎么用Canvas實(shí)現(xiàn)超炫酷煙花綻放動(dòng)畫(huà)
本文來(lái)源：http://muchs.cn/article30/pphdpo.html

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