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Created July 4, 2012 19:29
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A web page created at CodePen.io
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>La tortisha de Barcelona &middot; CodePen</title>
<style>
*{margin:0;padding:0}
html,body{height:100%;width:100;overflow:hidden}
​
</style>
<style>
#codepen-footer, #codepen-footer * {
-webkit-box-sizing: border-box !important;
-moz-box-sizing: border-box !important;
box-sizing: border-box !important;
}
#codepen-footer {
display: block !important;
position: fixed !important;
bottom: 0 !important;
left: 0 !important;
width: 100% !important;
padding: 0 10px !important;
margin: 0 !important;
height: 30px !important;
line-height: 30px !important;
font-size: 12px !important;
color: #eeeeee !important;
background-color: #505050 !important;
text-align: left !important;
background: -webkit-linear-gradient(top, #505050, #383838) !important;
background: -moz-linear-gradient(top, #505050, #383838) !important;
background: -ms-linear-gradient(top, #505050, #383838) !important;
background: -o-linear-gradient(top, #505050, #383838) !important;
border-top: 1px solid black !important;
border-bottom: 1px solid black !important;
border-radius: 0 !important;
border-image: none !important;
box-shadow: inset 0 1px 0 #6e6e6e, 0 2px 2px rgba(0, 0, 0, 0.4) !important;
z-index: 300 !important;
font-family: "Lucida Grande", "Lucida Sans Unicode", Tahoma, sans-serif !important;
letter-spacing: 0 !important;
word-spacing: 0 !important;
}
#codepen-footer a {
color: #a7a7a7 !important;
text-decoration: none !important;
}
#codepen-footer a:hover {
color: white !important;
}
</style>
<script>
// Kill alerts, confirmations and prompts
window.alert = function(){};
window.confirm = function(){};
window.prompt = function(){};
window.open = function(){};
window.print = function(){};
</script>
<script src="http://codepen.io/javascripts/libs/prefixfree.min.js"></script>
</head>
<body>
<canvas id="c"></canvas>​
<script src="http://codepen.io/javascripts/libs/modernizr.js"></script>
<script>
(function() {
/*jslint browser: true */
/*global window */
var degreesToRadians, isCanvas, checkDistance, update, resize, init, canvas, context, food, fleets, numFleets;
// easy request animation frame, (i don't care about old browsers here)
'ms moz o webkit'.split(' ').forEach(function (i) {
window.requestAnimationFrame = window[[i] + 'RequestAnimationFrame'];
window.cancelAnimationFrame = window[[i] + 'CancelAnimationFrame'] ||
window[[i] + 'CancelRequestAnimationFrame'];
});
degreesToRadians = function(value) {
return value * Math.PI / 180;
};
isCanvas = function(c) {
return Object.prototype.toString.call(c) === '[object HTMLCanvasElement]';
};
function Food(canvas, x, y) {
if (!canvas || !isCanvas(canvas)) { throw 'Canvas object must be defined.'; }
this.canvas = canvas;
this.context = this.canvas.getContext('2d');
this.x = x || 0;
this.y = y || 0;
this.radius = 40;
this.scale = 1.0;
}
Food.prototype = {
display: function() {
if (this.scale > 0) {
var r = this.radius * this.scale;
this.context.save();
this.context.lineWidth = 3;
this.context.beginPath();
this.context.arc(this.x, this.y, r, 0, Math.PI * 2, true);
this.context.closePath();
this.context.stroke();
this.context.restore();
}
}
};
function Fleet(canvas, x, y) {
if (!canvas || !isCanvas(c)) { throw 'Canvas is not defined'; }
this.canvas = canvas;
this.context = this.canvas.getContext('2d');
this.x = x || 0;
this.y = y || 0;
this.angle = 0;
this.ate = 0;
this.capacity = 10;
this.distX = 0;
this.distY = 0;
this.full = false;
this.lineLength = 10;
this.radius = 10;
}
Fleet.prototype = {
display: function() {
this.context.save();
this.context.translate(this.x, this.y);
this.context.rotate(degreesToRadians(this.angle));
this.context.beginPath();
this.context.moveTo(0, 0);
this.context.lineTo(0, this.lineLength);
this.context.closePath();
this.context.stroke();
this.context.beginPath();
this.context.arc(0, this.lineLength + this.radius, this.radius, 0, Math.PI * 2, true);
this.context.closePath();
this.context.stroke();
this.context.restore();
}
};
// kinda silly but kinda "works"
checkDistance = function(fleet) {
var dx, dy, dist;
dx = fleet.x - food.x;
dy = fleet.y - food.y;
dist = Math.sqrt(dx * dx + dy * dy);
return dist;
};
update = function() {
var i, f, restX = 0,
restY = 0,
angle;
//context.clearRect(0, 0, canvas.width, canvas.height);
canvas.width = canvas.width; // same as above.
for (i = 0; i < numFleets; i += 1) {
f = fleets[i];
if (f.full) {
f.distX = restX - f.x;
f.distY = restY - f.y;
f.ate -= 0.002;
if (f.ate < 1) {
f.full = false;
}
} else {
f.distX = food.x - f.x;
f.distY = food.y - f.y;
}
angle = Math.atan2(f.distY, f.distX);
f.angle = angle * 180 / Math.PI + 90;
if (checkDistance(f) < food.radius && !f.full) {
food.scale -= 0.002;
f.ate += 1;
if (f.ate > f.capacity) {
f.full = true;
f.ate = 0;
restX = Math.random() * canvas.width + f.x;
restY = Math.random() * canvas.height + f.y;
f.x = Math.random() * canvas.width;
f.y = Math.random() * canvas.height;
f.angle = (Math.random() * 360) * 180 / Math.PI + 90;
}
if (food.scale < 0.1) {
food.scale = 1;
food.x = Math.random() * canvas.width;
food.y = Math.random() * canvas.height;
}
}
f.x += f.distX / 10;
f.y += f.distY / 10;
f.display();
}
food.display();
window.requestAnimationFrame(update);
};
resize = function(e) {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
};
window.onresize = resize;
canvas = document.getElementById('c');
resize();
context = canvas.getContext('2d');
var i, w = canvas.width,
h = canvas.height;
numFleets = 10;
fleets = [];
food = new Food(canvas, w / 2, h / 2);
food.display();
for (i = 0; i < numFleets; i += 1) {
fleets[i] = new Fleet(canvas, Math.random() * w, Math.random() * h);
fleets[i].display();
}
update();​
})();
</script>
<div id="codepen-footer">
<a style="color: #f73535 !important;" href="https://codepen.wufoo.com/forms/m7x3r3/def/field14=" onclick="window.open(this.href, null, 'height=517, width=680, toolbar=0, location=0, status=1, scrollbars=1, resizable=1'); return false">Report Abuse</a>
&nbsp;
<a href="/Davidhidalgo/pen/3/2">Edit this Pen</a>
</div>
</body>
</html>
Raw
index.js
/*jslint browser: true */
/*global window */
var degreesToRadians, isCanvas, checkDistance, update, resize, init, canvas, context, food, fleets, numFleets;
// easy request animation frame, (i don't care about old browsers here)
'ms moz o webkit'.split(' ').forEach(function (i) {
window.requestAnimationFrame = window[[i] + 'RequestAnimationFrame'];
window.cancelAnimationFrame = window[[i] + 'CancelAnimationFrame'] ||
window[[i] + 'CancelRequestAnimationFrame'];
});
degreesToRadians = function(value) {
return value * Math.PI / 180;
};
isCanvas = function(c) {
return Object.prototype.toString.call(c) === '[object HTMLCanvasElement]';
};
function Food(canvas, x, y) {
if (!canvas || !isCanvas(canvas)) { throw 'Canvas object must be defined.'; }
this.canvas = canvas;
this.context = this.canvas.getContext('2d');
this.x = x || 0;
this.y = y || 0;
this.radius = 40;
this.scale = 1.0;
}
Food.prototype = {
display: function() {
if (this.scale > 0) {
var r = this.radius * this.scale;
this.context.save();
this.context.lineWidth = 3;
this.context.beginPath();
this.context.arc(this.x, this.y, r, 0, Math.PI * 2, true);
this.context.closePath();
this.context.stroke();
this.context.restore();
}
}
};
function Fleet(canvas, x, y) {
if (!canvas || !isCanvas(c)) { throw 'Canvas is not defined'; }
this.canvas = canvas;
this.context = this.canvas.getContext('2d');
this.x = x || 0;
this.y = y || 0;
this.angle = 0;
this.ate = 0;
this.capacity = 10;
this.distX = 0;
this.distY = 0;
this.full = false;
this.lineLength = 10;
this.radius = 10;
}
Fleet.prototype = {
display: function() {
this.context.save();
this.context.translate(this.x, this.y);
this.context.rotate(degreesToRadians(this.angle));
this.context.beginPath();
this.context.moveTo(0, 0);
this.context.lineTo(0, this.lineLength);
this.context.closePath();
this.context.stroke();
this.context.beginPath();
this.context.arc(0, this.lineLength + this.radius, this.radius, 0, Math.PI * 2, true);
this.context.closePath();
this.context.stroke();
this.context.restore();
}
};
// kinda silly but kinda "works"
checkDistance = function(fleet) {
var dx, dy, dist;
dx = fleet.x - food.x;
dy = fleet.y - food.y;
dist = Math.sqrt(dx * dx + dy * dy);
return dist;
};
update = function() {
var i, f, restX = 0,
restY = 0,
angle;
//context.clearRect(0, 0, canvas.width, canvas.height);
canvas.width = canvas.width; // same as above.
for (i = 0; i < numFleets; i += 1) {
f = fleets[i];
if (f.full) {
f.distX = restX - f.x;
f.distY = restY - f.y;
f.ate -= 0.002;
if (f.ate < 1) {
f.full = false;
}
} else {
f.distX = food.x - f.x;
f.distY = food.y - f.y;
}
angle = Math.atan2(f.distY, f.distX);
f.angle = angle * 180 / Math.PI + 90;
if (checkDistance(f) < food.radius && !f.full) {
food.scale -= 0.002;
f.ate += 1;
if (f.ate > f.capacity) {
f.full = true;
f.ate = 0;
restX = Math.random() * canvas.width + f.x;
restY = Math.random() * canvas.height + f.y;
f.x = Math.random() * canvas.width;
f.y = Math.random() * canvas.height;
f.angle = (Math.random() * 360) * 180 / Math.PI + 90;
}
if (food.scale < 0.1) {
food.scale = 1;
food.x = Math.random() * canvas.width;
food.y = Math.random() * canvas.height;
}
}
f.x += f.distX / 10;
f.y += f.distY / 10;
f.display();
}
food.display();
window.requestAnimationFrame(update);
};
resize = function(e) {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
};
window.onresize = resize;
canvas = document.getElementById('c');
resize();
context = canvas.getContext('2d');
var i, w = canvas.width,
h = canvas.height;
numFleets = 10;
fleets = [];
food = new Food(canvas, w / 2, h / 2);
food.display();
for (i = 0; i < numFleets; i += 1) {
fleets[i] = new Fleet(canvas, Math.random() * w, Math.random() * h);
fleets[i].display();
}
update();​
Raw
markup.html
<canvas id="c"></canvas>​
Raw
style.css
*{margin:0;padding:0}
html,body{height:100%;width:100;overflow:hidden}
​
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