HTML5絢麗煙花效果源碼分享

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<!doctype html> <html> <head> <meta charset="utf-8"> <title>非常漂亮的HTML5畫布煙火效果(HTML5 Canvas Fireworks)</title> <meta name="keywords" content="html5,canvas,Fireworks,煙火效果"> <meta name="description" content="非常漂亮的HTML5畫布煙火效果(HTML5 Canvas Fireworks)。"> <link rel="stylesheet" href="http://www.tqtqtq.com/demo/common/common.css"> 

canvas {
width:640px;
height:480px;
background:#000;
cursor: crosshair;
display: block;
}
</style>
</head>

<body>
<div id="demoContent">

<canvas id="canvas">Canvas is not supported in your browser.</canvas>
</div>

// now we will setup our basic variables for the demo
var canvas = document.getElementById( canvas ),
ctx = canvas.getContext( 2d ),
// canvas size
cw = 640,
ch = 480,
// firework collection
fireworks = [],
// particle collection
particles = [],
// starting hue
hue = 120,
// this will time the auto launches of fireworks, one launch per 80 loop ticks
timerTotal = 80,
timerTick = 0,
mousedown = false,
// mouse x coordinate and y coordinate,
mx,
my;
// set canvas dimensions
canvas.width = cw;
canvas.height = ch;

// now we are going to setup our function placeholders for the entire demo

// get a random number within a range
function random( min, max ) {
return Math.random() * ( max - min ) + min;
}

// calculate the distance between two points
function calculateDistance( p1x, p1y, p2x, p2y ) {
var xDistance = p1x - p2x,
yDistance = p1y - p2y;
return Math.sqrt( Math.pow( xDistance, 2 ) + Math.pow( yDistance, 2 ) );
}

// create firework
function Firework( sx, sy, tx, ty ) {
// actual coordinates
this.x = sx;
this.y = sy;
// starting coordinates
this.sx = sx;
this.sy = sy;
// target coordinates
this.tx = tx;
this.ty = ty;
// distance from starting point to target
this.distanceToTarget = calculateDistance( sx, sy, tx, ty );
this.distanceTraveled = 0;
// track the past coordinates of each firework to create a trail effect, increase the coordinate count to create more prominent trails
this.coordinates = [];
this.coordinateCount = 3;
// populate initial coordinate collection with the current coordinates
while( this.coordinateCount-- ) {
this.coordinates.push( [ this.x, this.y ] );
}
this.angle = Math.atan2( ty - sy, tx - sx );
this.speed = 1;
this.acceleration = 1.05;
this.brightness = random( 50, 70 );
// circle target indicator radius
this.targetRadius = 1;
}

// update firework
Firework.prototype.update = function( index ) {
// remove last item in coordinates array
this.coordinates.pop();
// add current coordinates to the start of the array
this.coordinates.unshift( [ this.x, this.y ] );

// cycle the circle target indicator radius
if( this.targetRadius < 8 ) {
this.targetRadius += 0.3;
} else {
this.targetRadius = 1;
}

// speed up the firework
this.speed *= this.acceleration;

// get the current velocities based on angle and speed
var vx = Math.cos( this.angle ) * this.speed,
vy = Math.sin( this.angle ) * this.speed;
// how far will the firework have traveled with velocities applied?
this.distanceTraveled = calculateDistance( this.sx, this.sy, this.x + vx, this.y + vy );

// if the distance traveled, including velocities, is greater than the initial distance to the target, then the target has been reached
if( this.distanceTraveled >= this.distanceToTarget ) {
createParticles( this.tx, this.ty );
// remove the firework, use the index passed into the update function to determine which to remove
fireworks.splice( index, 1 );
} else {
// target not reached, keep traveling
this.x += vx;
this.y += vy;
}
}

// draw firework
Firework.prototype.draw = function() {
ctx.beginPath();
// move to the last tracked coordinate in the set, then draw a line to the current x and y
ctx.moveTo( this.coordinates[ this.coordinates.length - 1][ 0 ], this.coordinates[ this.coordinates.length - 1][ 1 ] );
ctx.lineTo( this.x, this.y );
ctx.lineWidth=3;
ctx.strokeStyle = hsl( + hue + , 100%, + this.brightness + %);
ctx.stroke();

ctx.beginPath();
ctx.lineWidth=2;
// draw the target for this firework with a pulsing circle
ctx.arc( this.tx, this.ty, this.targetRadius, 0, Math.PI * 2 );
ctx.stroke();
}

// create particle
function Particle( x, y ) {
this.x = x;
this.y = y;
// track the past coordinates of each particle to create a trail effect, increase the coordinate count to create more prominent trails
this.coordinates = [];
this.coordinateCount = 6;
while( this.coordinateCount-- ) {
this.coordinates.push( [ this.x, this.y ] );
}
// set a random angle in all possible directions, in radians
this.angle = random( 0, Math.PI * 2 );
this.speed = random( 8, 12 );
// friction will slow the particle down
this.friction = 0.9;
// gravity will be applied and pull the particle down
this.gravity = 0.8;
// set the hue to a random number +-20 of the overall hue variable
this.hue = random( hue - 30, hue + 30 );
this.brightness = random( 50, 80 );
this.alpha = 1.2;
// set how fast the particle fades out
this.decay = random( 0.015, 0.05 );
}

// update particle
Particle.prototype.update = function( index ) {
// remove last item in coordinates array
this.coordinates.pop();
// add current coordinates to the start of the array
this.coordinates.unshift( [ this.x, this.y ] );
// slow down the particle
this.speed *= this.friction;
// apply velocity
this.x += Math.cos( this.angle ) * this.speed;
this.y += Math.sin( this.angle ) * this.speed + this.gravity;
// fade out the particle
this.alpha -= this.decay;

// remove the particle once the alpha is low enough, based on the passed in index
if( this.alpha <= this.decay ) {
particles.splice( index, 1 );
}
}

// draw particle
Particle.prototype.draw = function() {
ctx. beginPath();
// move to the last tracked coordinates in the set, then draw a line to the current x and y
ctx.moveTo( this.coordinates[ this.coordinates.length - 1 ][ 0 ], this.coordinates[ this.coordinates.length - 1 ][ 1 ] );
ctx.lineTo( this.x, this.y );
ctx.lineWidth=3;
ctx.strokeStyle = hsla( + this.hue + , 100%, + this.brightness + %, + this.alpha + );
ctx.stroke();
}

// create particle group/explosion
function createParticles( x, y ) {
// increase the particle count for a bigger explosion, beware of the canvas performance hit with the increased particles though
var particleCount = 20;
while( particleCount-- ) {
particles.push( new Particle( x, y ) );
}
}

// main demo loop
function loop() {
// this function will run endlessly with requestAnimationFrame
requestAnimFrame( loop );

// increase the hue to get different colored fireworks over time
hue += 0.5;

// normally, clearRect() would be used to clear the canvas
// we want to create a trailing effect though
// setting the composite operation to destination-out will allow us to clear the canvas at a specific opacity, rather than wiping it entirely
ctx.globalCompositeOperation = destination-out;
// decrease the alpha property to create more prominent trails
ctx.fillStyle = rgba(0, 0, 0, 0.5);
ctx.fillRect( 0, 0, cw, ch );
// change the composite operation back to our main mode
// lighter creates bright highlight points as the fireworks and particles overlap each other
ctx.globalCompositeOperation = lighter;

// loop over each firework, draw it, update it
var i = fireworks.length;
while( i-- ) {
fireworks[ i ].draw();
fireworks[ i ].update( i );
}

// loop over each particle, draw it, update it
var i = particles.length;
while( i-- ) {
particles[ i ].draw();
particles[ i ].update( i );
}

// launch fireworks automatically to random coordinates, when the mouse isnt down
if( timerTick >= timerTotal ) {
if( !mousedown ) {
// start the firework at the bottom (ox,ch), then set the random target coordinates, the random y coordinates will be set within the range of the top half of the screen
var ox = random( 0, cw );
var oy = random( 0, ch / 2 );
fireworks.push( new Firework( ox, ch, ox, oy ) );
timerTick = 0;
}
} else {
timerTick++;
}
}

// toggle mousedown state and prevent canvas from being selected
canvas.addEventListener( click, function( e ) {
e.preventDefault();
mousedown = true;
// limit the rate at which fireworks get launched when mouse is down
if( mousedown ) {
// update the mouse coordinates
mx = e.pageX - canvas.offsetLeft;
my = e.pageY - canvas.offsetTop;
// start the firework at the bottom middle of the screen, then set the current mouse coordinates as the target
fireworks.push( new Firework( mx, ch, mx, my ) );
}
});

// once the window loads, we are ready for some fireworks!
window.onload = loop;
</script>

<script src="http://www.tqtqtq.com/demo/common/common.js" type="text/jscript"></script>
</body>
</html>