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Squirm.html
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Squirm.html
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<html>
<head>
<meta charset="utf-8">
<title>Motion</title>
<script>
window.onload = function background() {
var canvas = document.createElement("canvas"),
c = canvas.getContext("2d")
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
document.body.appendChild(canvas);
document.body.style.cursor = 'none';
particles = {};
particleIndex = 0,
particleNum = 1;
c.fillStyle = "black";
c.fillRect(0, 0, canvas.width, canvas.height);
var locVarX = 0;
var locVarY = 0;
var alphaCtrl = 0.1;
var frame = 0;
var rads = 0;
var spinX = 0;
var spinY = 0;
var pulseVar = 0;
var pulseVarCt = 0;
document.onkeydown = function (e) {
switch (e.keyCode) {
case 32:
//SPACE
locVarX = 0;
locVarY = 0;
alphaCtrl = .3;
break;
case 65:
//LEFT
locVarX -= 2;
break;
case 87:
//UP
locVarY += 2;
break;
case 68:
//RIGHT
locVarX += 2;
break;
case 83:
//DOWN
spinX = 2 * Math.cos(rads / 4);
spinY = 2 * Math.sin(rads / 4);
rads++;
break;
case 81:
//Q
pulseVar = 5 * Math.cos(pulseVarCt / 3);
pulseVarCt++;
break;
case 69:
pulseVar = 5 * Math.cos(pulseVarCt);
pulseVarCt++;
//E
break;
case 70:
pulseVar = 5 * Math.cos(pulseVarCt / 3);
pulseVarCt++;
spinX = 2 * Math.cos(rads / 4);
spinY = 2 * Math.sin(rads / 4);
rads++;
//E
break;
}
}
//initiate mouse and add event listener
var mouse = {
x: undefined,
y: undefined
}
window.addEventListener('mousemove',
function (event) {
mouse.x = event.x;
mouse.y = event.y;
//console.log(mouse);
});
x = new Particle;
function Particle() {
particleIndex++;
particles[particleIndex] = this;
this.id = particleIndex;
//give particle slight movement
this.x = mouse.x - 2.5 * Math.cos(this.id / 15) + locVarX;
this.y = mouse.y - 2.5 * Math.sin(this.id / 15) + locVarY;
//initiate velocity
this.vx = 1;
this.vy = 1;
//initiate radius, growth rate, alpha, and thickness
this.radius = 5;
this.radiusGrowth = 1;
this.alpha = 1;
//this.color = "rgba(255,255,255,"+this.alpha+")";
this.thick = 2;
//life span
this.life = 0;
this.maxLife = 100;
this.color = 255;
this.counter = 0;
this.counterTruth = 1;
}
Particle.prototype.draw = function () {
//calculate and update velocity to tend towards center
if (this.life == 0) {
x = this;
;
this.magnitude = -1 * Math.sqrt(Math.abs(Math.pow(mouse.x - canvas.width / 2, 2) + Math.pow(mouse.y - canvas.height / 2, 2)));
this.vx = (1 * (Math.cos(this.id / 40) + 2)) * (mouse.x - canvas.width / 2) / this.magnitude;
this.vy = (1 * Math.sin(this.id / 40) + 2) * (mouse.y - canvas.height / 2) / this.magnitude;
} else {
this.magnitude = x.magnitude;
this.vx = x.vx;
this.vy = x.vy;
}
this.x += this.vx + locVarX + spinX;
this.y += this.vy + locVarY + spinY;
this.vx *= 1.1;
this.vy *= 1.1;
this.life++
if (this.life >= this.maxLife) {
delete particles[this.id]
}
//tear drop
this.radius = 50 * Math.sqrt(this.life / (10 - pulseVar))
if (this.radius <= 0) {
this.radius = 0;
}
c.beginPath();
c.arc(canvas.width - Math.abs(this.x - canvas.width), canvas.height - Math.abs(this.y - canvas.height), this.radius, 0, Math.PI * 2, false);
c.strokeStyle = "rgba(0,255," + (this.color) + "," + this.alpha + ")";
c.lineWidth = this.thick;
c.stroke();
//Bottom left (when mouse is top right)
c.beginPath();
c.arc(Math.abs(this.x - canvas.width), Math.abs(this.y - canvas.height), this.radius, 0, Math.PI * 2, false);
c.strokeStyle = "rgba(0,255," + (this.color) + "," + this.alpha + ")";
c.lineWidth = this.thick;
c.stroke();
//Top Left (when mouse is top right)
c.beginPath();
c.arc(Math.abs(this.x - canvas.width),/*Math.abs(this.y-canvas.height/2)*/ canvas.height - Math.abs(this.y - canvas.height), this.radius, 0, Math.PI * 2, false);
c.strokeStyle = "rgba(0,255," + (this.color) + "," + this.alpha + ")";
c.lineWidth = this.thick;
c.stroke();
//Bottom Right (when mouse is top right)
c.beginPath();
c.arc(canvas.width - Math.abs(this.x - canvas.width), Math.abs(this.y - canvas.height), this.radius, 0, Math.PI * 2, false);
c.strokeStyle = "rgba(0,255," + (this.color) + "," + this.alpha + ")";
c.lineWidth = this.thick;
c.stroke();
this.thick *= 0.99;
this.alpha *= 0.99;
}
setInterval(function () {
c.fillStyle = "rgba(0,0,0,1)";
c.fillRect(0, 0, canvas.width, canvas.height);
frame++;
new Particle();
for (var i in particles) {
particles[i].draw();
}
}, 5);
};
</script>
</head>
<body style="overflow:hidden; position:absolute; padding: 0; margin: 0; ">
</body>
</html>