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Ocean waves Javascript Animation External Script
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function Waves( $canvas, $width, $height ){ | |
this.numberOfWaves = 10; | |
this.waveGap = 20; | |
this.width = Waves.width = $width; | |
this.height = Waves.height = $height; | |
Waves.globalY = 0; | |
this.move = 1; | |
this.ctx = $canvas.getContext( '2d' ); | |
this.colour = Math.round(Math.random()*255)+", "+Math.round(Math.random()*255)+", "+Math.round(Math.random()*255); | |
this.wavesArray = new Array(); | |
this.beginingY = Waves.height / 2; | |
while(this.numberOfWaves--){ | |
this.wavesArray.push(new Wave($canvas, this.beginingY, this.colour, 1 / this.numberOfWaves)); | |
this.beginingY += this.waveGap; | |
} | |
this.update = function(){ | |
var bL = this.wavesArray.length; | |
while( bL-- ){ | |
this.wavesArray[ bL ].update( ); | |
} | |
Waves.globalY += this.move; | |
if(Waves.globalY > (Waves.height / 2)-50){ | |
this.move = -1; | |
}else if(Waves.globalY < -(Waves.height / 2)){ | |
this.move = 1; | |
} | |
} | |
this.draw = function(){ | |
this.ctx.clearRect(0,0,this.width,this.height); | |
this.ctx.save(); | |
var bL = this.wavesArray.length; | |
while( bL-- ){ | |
this.wavesArray[ bL ].draw( ); | |
} | |
this.ctx.restore(); | |
} | |
} | |
function Wave($canvas, $y, $colour, $alpha ){ | |
this.ctx = $canvas.getContext( '2d' ); | |
this.force = 0; | |
this.wavePower = 40; | |
this.count = $y; | |
this.y = $y + Waves.globalY; | |
this.alpha = $alpha; | |
this.update = function(){ | |
this.y = $y + Waves.globalY; | |
this.force = Math.sin(this.count); | |
this.count += 0.05; | |
} | |
this.draw = function(){ | |
this.ctx.fillStyle = "rgba("+$colour+", "+this.alpha+")"; | |
this.ctx.beginPath(); | |
this.ctx.moveTo(0, this.y); | |
this.ctx.quadraticCurveTo(Waves.width / 4, this.y + ( this.wavePower * this.force ), Waves.width / 2, this.y); | |
this.ctx.quadraticCurveTo(Waves.width * 0.75, this.y - ( this.wavePower * this.force ), Waves.width, this.y); | |
this.ctx.lineTo(Waves.width, Waves.height); | |
this.ctx.lineTo(0, Waves.height); | |
this.ctx.lineTo(0, this.y); | |
this.ctx.closePath(); | |
this.ctx.fill(); | |
} | |
} | |
//CALLS to Make Waves | |
var canvas = null; | |
var waves = null; | |
function loadCanvas( ) { | |
canvas = document.getElementById( 'canvas' ); | |
canvas.width = window.innerWidth; | |
canvas.height = window.innerHeight; | |
waves = new Waves( canvas, 1000, 800 ); | |
setInterval( "run()", 80 ); | |
} | |
function run(){ | |
waves.update( ); | |
waves.draw( ); | |
} | |
window.addEventListener( 'load', loadCanvas, false ); |
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