Rain Landing in a Pond

Developer
Ed Ball
Size
3,009 Kb
Views
16,184

How do I make an rain landing in a pond?

A series of slowly expanding circles, randomly appearing on a blue background (subtle circular gradient) gives me the impression of rain drops falling in a pond, creating ripples. Although the appearance is quite different, I based the code on this pen here, http://codepen.io/jackrugile/pen/Jbnpv.. What is a rain landing in a pond? How do you make a rain landing in a pond? This script and codes were developed by Ed Ball on 12 November 2022, Saturday.

Rain Landing in a Pond Previews
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Rain Landing in a Pond - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Rain Landing in a Pond</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <body> <canvas id="c"></canvas>
</body> <script src="js/index.js"></script>
</body>
</html>

Rain Landing in a Pond - Script Codes CSS Codes

body {	margin: 0;	padding: 0;	height: 100%;	width: 100%;	}
canvas { display: block; position: absolute; background: -moz-radial-gradient(center, ellipse cover, rgba(171,209,234,0.5) 0%, rgba(125,185,232,0.75) 100%); /* FF3.6+ */ background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%,rgba(171,209,234,0.5)), color-stop(100%,rgba(125,185,232,0.75))); /* Chrome,Safari4+ */ background: -webkit-radial-gradient(center, ellipse cover, rgba(171,209,234,0.5) 0%,rgba(125,185,232,0.75) 100%); /* Chrome10+,Safari5.1+ */ background: -o-radial-gradient(center, ellipse cover, rgba(171,209,234,0.5) 0%,rgba(125,185,232,0.75) 100%); /* Opera 12+ */ background: -ms-radial-gradient(center, ellipse cover, rgba(171,209,234,0.5) 0%,rgba(125,185,232,0.75) 100%); /* IE10+ */ background: radial-gradient(ellipse at center, rgba(171,209,234,0.5) 0%,rgba(125,185,232,0.75) 100%); /* W3C */ filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#80abd1ea', endColorstr='#bf7db9e8',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */	}

Rain Landing in a Pond - Script Codes JS Codes

//setTimeoue needed to get full screen canvas
setTimeout(function() {
function resizeCanvas() { ch = window.innerHeight; cw = window.innerWidth; c.width = cw; c.height = ch;
};
var cw, ch, c = document.getElementById('c'), ctx = c.getContext('2d'), parts = [], globalTick = 0, rand = function(min, max){ return Math.floor( (Math.random() * (max - min + 1) ) + min); };
var Part = function(){ this.reset();
};
Part.prototype.reset = function(){ this.startRadius = rand(1, 10); // this.startRadius = rand(20, 25); this.radius = this.startRadius; this.x = rand(0, c.width); this.y = rand(0, c.height); this.hue = 210; this.saturation = rand(40, 60); this.lightness = rand(70, 80); this.startAlpha = 0.5; this.alpha = this.startAlpha; this.decayRate = .3; this.startLife = rand(20, 30); // this.startLife = 15; this.life = this.startLife; this.lineWidth = 1;
}
Part.prototype.update = function(){ this.alpha = this.startAlpha * (this.life / this.startLife); this.radius = this.radius+1; this.life -= this.decayRate;
};
Part.prototype.render = function(){ ctx.beginPath(); ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false); ctx.fillStyle = ctx.strokeStyle = 'hsla('+this.hue+', '+this.saturation+'%, '+this.lightness+'%, '+this.alpha+')'; ctx.lineWidth = this.lineWidth; ctx.fill(); // ctx.stroke();
};
var createParts = function(){ parts.push(new Part());
};
var updateParts = function(){ var i = parts.length; while(i--){ if (parts[i].life < 0){ parts.splice(i, 1) } parts[i].update(); }
};
var renderParts = function(){ var i = parts.length; while(i--){ parts[i].render(); }
};
var clear = function(){ ctx.globalCompositeOperation = 'destination-out'; ctx.fillStyle = 'hsla(0, 0%, 0%, 1)'; ctx.fillRect(0, 0, cw, ch); ctx.globalCompositeOperation = 'source-over';
};
//Run through the first iterations to get all the parts ready for rendering.
for (i = 0 ; i < 200 ; i++){ if (globalTick % 6 == 0){ createParts(); } updateParts(); globalTick++;
}
var loop = function(){ window.requestAnimFrame(loop, c); clear(); if (globalTick % 6 == 0){ createParts(); }	updateParts();	renderParts();	globalTick++;
};
window.requestAnimFrame=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(a){window.setTimeout(a,1E3/60)}}();
resizeCanvas();
window.onresize = resizeCanvas;
loop();
}, 1);
Rain Landing in a Pond - Script Codes
Rain Landing in a Pond - Script Codes
Home Page Home
Developer Ed Ball
Username edball
Uploaded November 12, 2022
Rating 4.5
Size 3,009 Kb
Views 16,184
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