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dropWidget.html
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<html>
<head>
<style>
html, body
{
width: 100%;
height: 100%;
margin: 0px;
border: 0;
overflow: hidden; /* Disable scrollbars */
display: block; /* No floating content on sides */
}
</style>
</head>
<body style="background-color:white;">
<canvas id='c' style = 'position: absolute; left: 0px; top: 0px;' >
</canvas>
<script>
var htmlCanvas = document.getElementById('c');
var context = htmlCanvas.getContext('2d');
var waterDrops = [];
var waterWaves = [];
var color = "#56B6D9";
var targetHeight = 50;
var tension = 0.025;
var dampening = 0.025;
var spread = 0.25;
var gravity = 0.8;
var rate = "300";
initialize();
function getQueryVariable(variable)
{
var query = window.location.search.substring(1);
var vars = query.split("&");
for (var i=0;i<vars.length;i++)
{
var pair = vars[i].split("=");
if(pair[0] == variable)
{
return pair[1];
}
}
return(false);
}
function WaterWave(x,y)
{
this.y = y;
this.x = x;
this.targetHeight = y;
this.velY = 0;
this.Update = function()
{
var x = this.targetHeight - this.y;
this.velY += tension * x - this.velY * dampening;
this.y += this.velY;
}
}
function WaterDrop(x,y,velx,vely)
{
this.alive = true;
this.y = y;
this.x = x;
this.velX = velx;
this.velY = vely;
this.Update = function()
{
if(this.alive)
{
this.velY += gravity;
this.x += this.velX;
this.y += this.velY;
}
}
}
function updateWaterDrops()
{
for (var i = 0; i < waterDrops.length; i++)
{
waterDrops[i].Update();
}
}
function collisionDetection()
{
for (var i = 0; i < waterDrops.length; i++)
{
if(waterDrops[i].alive)
{
var wave = waterWaves[Math.round(waterDrops[i].x / 5)];
if(wave)
{
if(waterDrops[i].y > wave.y)
{
wave.velY -= waterDrops[i].velY;
waterDrops[i].alive = false;
}
}
}
}
}
function updateWaterWaves()
{
for (var i = 0; i < waterWaves.length; i++)
{
waterWaves[i].Update();
}
var lDeltas = [waterWaves.length];
var rDeltas = [waterWaves.length];
for (var j = 0; j < 8; j++)
{
for (var i = 0; i < waterWaves.length; i++)
{
if (i > 0)
{
lDeltas[i] = spread * (waterWaves[i].y - waterWaves[i - 1].y);
waterWaves[i - 1].velY += lDeltas[i];
}
if (i < waterWaves.length - 1)
{
rDeltas[i] = spread * (waterWaves[i].y - waterWaves[i + 1].y);
waterWaves[i + 1].velY += rDeltas[i];
}
}
for (var i = 0; i < waterWaves.length; i++)
{
if (i > 0)
{
waterWaves[i - 1].y += lDeltas[i];
}
if (i < waterWaves.length - 1)
{
waterWaves[i + 1].y += rDeltas[i];
}
}
}
}
function initialize()
{
window.addEventListener('resize', resizeCanvas, false);
var col = getQueryVariable("color");
if(col)
{
color = "#" + col;
}
var rat = getQueryVariable("rate");
if(rat)
{
rate = rat;
}
resizeCanvas();
}
function redraw()
{
context.clearRect(0, 0, htmlCanvas.width, htmlCanvas.height);
context.fillStyle = color;
for(var i = 0; i < waterDrops.length; i++)
{
if(waterDrops[i].alive)
{
context.beginPath();
context.arc(waterDrops[i].x, waterDrops[i].y, 4, 0, 2 * Math.PI, false);
context.fill();
}
}
context.beginPath();
context.moveTo(0, window.innerHeight);
for(var i = 0; i < waterWaves.length; i++)
{
context.lineTo(waterWaves[i].x, waterWaves[i].y);
}
context.lineTo(window.innerWidth, window.innerHeight);
context.closePath();
context.fill();
}
function resizeCanvas()
{
htmlCanvas.width = window.innerWidth;
htmlCanvas.height = window.innerHeight;
waterWaves = [];
waterDrops = [];
for(var i = 0; i < htmlCanvas.width + 5; i+= 5)
{
waterWaves[waterWaves.length] = new WaterWave(i,window.innerHeight - targetHeight);
}
redraw();
}
function updateScene()
{
updateWaterWaves();
updateWaterDrops();
collisionDetection();
redraw();
}
function rain()
{
var position = Math.floor((Math.random() * htmlCanvas.width) + 1);
var reuse = false;
for (var i = 0; i < waterDrops.length; i++)
{
if(!waterDrops[i].alive)
{
waterDrops[i] = new WaterDrop(position, 0, 0, 0);
reuse = true;
i = waterDrops.length;
}
}
if(!reuse)
{
waterDrops[waterDrops.length] = new WaterDrop(position, 0, 0, 0);
}
}
setInterval(updateScene, 16);
setInterval(rain, parseInt(rate));
</script>
</body>
</html>