any chance in spinning up a litecoin clock ? especially since the diff changes so much faster.
i'm not interested myself, but anyone's welcome to copy what i did... it's pretty simple, and should be easy to modify for litecoin.
index.php:
<?php
$blockcount=preg_replace('/[^0-9]/','',file_get_contents('http://blockexplorer.com/q/getblockcount'));
?><!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="refresh" content="60; url=http://bitcoinclock.com/">
<title>Bitcoin Clock</title>
<link rel="stylesheet" type="text/css" href="styles.css">
<!--[if IE]><script type="text/javascript" src="excanvas.js"></script><![endif]-->
<script src="coolclock.php?b=
<?php echo $blockcount; ?>" type="text/javascript"></script>
</head>
<body onload="CoolClock.findAndCreateClocks()">
<div align="center">
<h1>Bitcoin Clock</h1>
<p>
</p>
<canvas id="c1" class="CoolClock:classic:250" width="500" height="500" style="width: 500px; height: 500px; "></canvas>
<br><br>
Block count:
<?php echo $blockcount; ?><br>
Blocks since last difficulty change:
<?php echo $blockcount%2016; ?><br><br>
Hour hand goes around once every 210,000 blocks<br>
(Block reward drops by half every time hour hand reaches 12)<br>
(This should occur approximately once every 4 years)<br><br>
Minute hand goes around once every 2016 blocks<br>
(Difficulty change occurs every time minute hand reaches 12)<br>
(This should occur approximately once every 2 weeks)<br><br>
Second hand goes around once every 144 blocks<br>
(This should occur approximately once every 24 hours)
</div>
</body></html>
coolclock.php:
<?php
$blockcount=preg_replace('/[^0-9]/','',$_GET['b']);
?>
/**
* CoolClock 2.1.4
* Copyright 2010, Simon Baird
* Released under the BSD License.
*
* Display an analog clock using canvas.
* http://randomibis.com/coolclock/
*
*/
// Constructor for CoolClock objects
window.CoolClock = function(options) {
return this.init(options);
}
// Config contains some defaults, and clock skins
CoolClock.config = {
tickDelay: 10000,
longTickDelay: 15000,
defaultRadius: 85,
renderRadius: 100,
defaultSkin: "classic",
// Should be in skin probably...
// (TODO: allow skinning of digital display)
showSecs: true,
showAmPm: false,
skins: {
// There are more skins in moreskins.js
// Try making your own skin by copy/pasting one of these and tweaking it
classic/*was gIG*/: {
outerBorder: { lineWidth: 185, radius: 1, color: "#E5ECF9", alpha: 1 },
smallIndicator: { lineWidth: 2, startAt: 89, endAt: 94, color: "#3366CC", alpha: 1 },
largeIndicator: { lineWidth: 4, startAt: 83, endAt: 94, color: "#3366CC", alpha: 1 },
hourHand: { lineWidth: 5, startAt: 0, endAt: 60, color: "black", alpha: 1 },
minuteHand: { lineWidth: 4, startAt: 0, endAt: 80, color: "black", alpha: 1 },
secondHand: { lineWidth: 1, startAt: -20, endAt: 85, color: "red", alpha: .85 },
secondDecoration: { lineWidth: 3, startAt: 0, radius: 2, fillColor: "black", color: "black", alpha: 1 }
},
swissRail: {
outerBorder: { lineWidth: 2, radius:95, color: "black", alpha: 1 },
smallIndicator: { lineWidth: 2, startAt: 88, endAt: 92, color: "black", alpha: 1 },
largeIndicator: { lineWidth: 4, startAt: 79, endAt: 92, color: "black", alpha: 1 },
hourHand: { lineWidth: 8, startAt: -15, endAt: 50, color: "black", alpha: 1 },
minuteHand: { lineWidth: 7, startAt: -15, endAt: 75, color: "black", alpha: 1 },
secondHand: { lineWidth: 1, startAt: -20, endAt: 85, color: "red", alpha: 1 },
secondDecoration: { lineWidth: 1, startAt: 70, radius: 4, fillColor: "red", color: "red", alpha: 1 }
},
chunkySwiss: {
outerBorder: { lineWidth: 4, radius:97, color: "black", alpha: 1 },
smallIndicator: { lineWidth: 4, startAt: 89, endAt: 93, color: "black", alpha: 1 },
largeIndicator: { lineWidth: 8, startAt: 80, endAt: 93, color: "black", alpha: 1 },
hourHand: { lineWidth: 12, startAt: -15, endAt: 60, color: "black", alpha: 1 },
minuteHand: { lineWidth: 10, startAt: -15, endAt: 85, color: "black", alpha: 1 },
secondHand: { lineWidth: 4, startAt: -20, endAt: 85, color: "red", alpha: 1 },
secondDecoration: { lineWidth: 2, startAt: 70, radius: 8, fillColor: "red", color: "red", alpha: 1 }
},
chunkySwissOnBlack: {
outerBorder: { lineWidth: 4, radius:97, color: "white", alpha: 1 },
smallIndicator: { lineWidth: 4, startAt: 89, endAt: 93, color: "white", alpha: 1 },
largeIndicator: { lineWidth: 8, startAt: 80, endAt: 93, color: "white", alpha: 1 },
hourHand: { lineWidth: 12, startAt: -15, endAt: 60, color: "white", alpha: 1 },
minuteHand: { lineWidth: 10, startAt: -15, endAt: 85, color: "white", alpha: 1 },
secondHand: { lineWidth: 4, startAt: -20, endAt: 85, color: "red", alpha: 1 },
secondDecoration: { lineWidth: 2, startAt: 70, radius: 8, fillColor: "red", color: "red", alpha: 1 }
}
},
// Test for IE so we can nurse excanvas in a couple of places
isIE: !!document.all,
// Will store (a reference to) each clock here, indexed by the id of the canvas element
clockTracker: {},
// For giving a unique id to coolclock canvases with no id
noIdCount: 0
};
// Define the CoolClock object's methods
CoolClock.prototype = {
// Initialise using the parameters parsed from the colon delimited class
init: function(options) {
// Parse and store the options
this.canvasId = options.canvasId;
this.skinId = options.skinId || CoolClock.config.defaultSkin;
this.displayRadius = options.displayRadius || CoolClock.config.defaultRadius;
this.showSecondHand = typeof options.showSecondHand == "boolean" ? options.showSecondHand : true;
this.gmtOffset = (options.gmtOffset != null && options.gmtOffset != '') ? parseFloat(options.gmtOffset) : null;
this.showDigital = typeof options.showDigital == "boolean" ? options.showDigital : false;
this.logClock = typeof options.logClock == "boolean" ? options.logClock : false;
this.logClockRev = typeof options.logClock == "boolean" ? options.logClockRev : false;
this.tickDelay = CoolClock.config[ this.showSecondHand ? "tickDelay" : "longTickDelay" ];
// Get the canvas element
this.canvas = document.getElementById(this.canvasId);
// Make the canvas the requested size. It's always square.
this.canvas.setAttribute("width",this.displayRadius*2);
this.canvas.setAttribute("height",this.displayRadius*2);
this.canvas.style.width = this.displayRadius*2 + "px";
this.canvas.style.height = this.displayRadius*2 + "px";
// Explain me please...?
this.renderRadius = CoolClock.config.renderRadius;
this.scale = this.displayRadius this.renderRadius;
// Initialise canvas context
this.ctx = this.canvas.getContext("2d");
this.ctx.scale(this.scale,this.scale);
// Keep track of this object
CoolClock.config.clockTracker[this.canvasId] = this;
// Start the clock going
this.tick();
return this;
},
// Draw a circle at point x,y with params as defined in skin
fullCircleAt: function(x,y,skin) {
this.ctx.save();
this.ctx.globalAlpha = skin.alpha;
this.ctx.lineWidth = skin.lineWidth;
if (!CoolClock.config.isIE) {
this.ctx.beginPath();
}
if (CoolClock.config.isIE) {
// excanvas doesn't scale line width so we will do it here
this.ctx.lineWidth = this.ctx.lineWidth * this.scale;
}
this.ctx.arc(x, y, skin.radius, 0, 2*Math.PI, false);
if (CoolClock.config.isIE) {
// excanvas doesn't close the circle so let's fill in the tiny gap
this.ctx.arc(x, y, skin.radius, -0.1, 0.1, false);
}
if (skin.fillColor) {
this.ctx.fillStyle = skin.fillColor
this.ctx.fill();
}
else {
// XXX why not stroke and fill
this.ctx.strokeStyle = skin.color;
this.ctx.stroke();
}
this.ctx.restore();
},
// Draw some text centered vertically and horizontally
drawTextAt: function(theText,x,y) {
this.ctx.save();
this.ctx.font = '15px sans-serif';
var tSize = this.ctx.measureText(theText);
if (!tSize.height) tSize.height = 15;/ no height in firefox.. :(
this.ctx.fillText(theText,x - tSize.width/2,y - tSize.height/2);
this.ctx.restore();
},
lpad2: function(num) {
return (num < 10 ? '0' : '') + num;
},
tickAngle: function(second) {
// Log algorithm by David Bradshaw
var tweak = 3;/ If it's lower the one second mark looks wrong (?)
if (this.logClock) {
return second == 0 ? 0 : (Math.log(second*tweak) Math.log(60*tweak));
}
else if (this.logClockRev) {
// Flip the seconds then flip the angle (trickiness)
second = (60 - second) % 60;
return 1.0 - (second == 0 ? 0 : (Math.log(second*tweak) Math.log(60*tweak)));
}
else {
return second/60.0;
}
},
timeText: function(hour,min,sec) {
var c = CoolClock.config;
return '' +
(c.showAmPm ? ((hour%12)==0 ? 12 : (hour%12)) : hour) + ':' +
this.lpad2(min) +
(c.showSecs ? ':' + this.lpad2(sec) : '') +
(c.showAmPm ? (hour < 12 ? ' am' : ' pm') : '')
;
},
// Draw a radial line by rotating then drawing a straight line
// Ha ha, I think I've accidentally used Taus, (see http://tauday.com/)
radialLineAtAngle: function(angleFraction,skin) {
this.ctx.save();
this.ctx.translate(this.renderRadius,this.renderRadius);
this.ctx.rotate(Math.PI * (2.0 * angleFraction - 0.5));
this.ctx.globalAlpha = skin.alpha;
this.ctx.strokeStyle = skin.color;
this.ctx.lineWidth = skin.lineWidth;
if (CoolClock.config.isIE)
// excanvas doesn't scale line width so we will do it here
this.ctx.lineWidth = this.ctx.lineWidth * this.scale;
if (skin.radius) {
this.fullCircleAt(skin.startAt,0,skin)
}
else {
this.ctx.beginPath();
this.ctx.moveTo(skin.startAt,0)
this.ctx.lineTo(skin.endAt,0);
this.ctx.stroke();
}
this.ctx.restore();
},
render: function(hour,min,sec) {
// Get the skin
var skin = CoolClock.config.skins[this.skinId];
if (!skin) skin = CoolClock.config.skins[CoolClock.config.defaultSkin];
// Clear
this.ctx.clearRect(0,0,this.renderRadius*2,this.renderRadius*2);
// Draw the outer edge of the clock
if (skin.outerBorder)
this.fullCircleAt(this.renderRadius,this.renderRadius,skin.outerBorder);
// Draw the tick marks. Every 5th one is a big one
for (var i=0;i<60;i++) {
(i%5) && skin.smallIndicator && this.radialLineAtAngle(this.tickAngle(i),skin.smallIndicator);
!(i%5) && skin.largeIndicator && this.radialLineAtAngle(this.tickAngle(i),skin.largeIndicator);
}
// Write the time
if (this.showDigital) {
this.drawTextAt(
this.timeText(hour,min,sec),
this.renderRadius,
this.renderRadius+this.renderRadius/2
);
}
// Draw the hands
if (skin.hourHand)
this.radialLineAtAngle(<?php echo $blockcount; ?>/210000,skin.hourHand);
if (skin.minuteHand)
this.radialLineAtAngle(<?php echo $blockcount; ?>%2016/2016,skin.minuteHand);
if (this.showSecondHand && skin.secondHand)
this.radialLineAtAngle(<?php echo $blockcount; ?>%144/144,skin.secondHand);
// Second hand decoration doesn't render right in IE so lets turn it off
if (!CoolClock.config.isIE && this.showSecondHand && skin.secondDecoration)
this.radialLineAtAngle(this.tickAngle(sec),skin.secondDecoration);
},
// Check the time and display the clock
refreshDisplay: function() {
var now = new Date();
if (this.gmtOffset != null) {
// Use GMT + gmtOffset
var offsetNow = new Date(now.valueOf() + (this.gmtOffset * 1000 * 60 * 60));
this.render(offsetNow.getUTCHours(),offsetNow.getUTCMinutes(),offsetNow.getUTCSeconds());
}
else {
// Use local time
this.render(now.getHours(),now.getMinutes(),now.getSeconds());
}
},
// Set timeout to trigger a tick in the future
nextTick: function() {
setTimeout("CoolClock.config.clockTracker['"+this.canvasId+"'].tick()",this.tickDelay);
},
// Check the canvas element hasn't been removed
stillHere: function() {
return document.getElementById(this.canvasId) != null;
},
// Main tick handler. Refresh the clock then setup the next tick
tick: function() {
if (this.stillHere()) {
//this.refreshDisplay()
this.render(0,0,0);
this.nextTick();
}
}
};
// Find all canvas elements that have the CoolClock class and turns them into clocks
CoolClock.findAndCreateClocks = function() {
// (Let's not use a jQuery selector here so it's easier to use frameworks other than jQuery)
var canvases = document.getElementsByTagName("canvas");
for (var i=0;i<canvases.length;i++) {
// Pull out the fields from the class. Example "CoolClock:chunkySwissOnBlack:1000"
var fields = canvases[i].className.split(" ")[0].split(":");
if (fields[0] == "CoolClock") {
if (!canvases[i].id) {
// If there's no id on this canvas element then give it one
canvases[i].id = '_coolclock_auto_id_' + CoolClock.config.noIdCount++;
}
// Create a clock object for this element
new CoolClock({
canvasId: canvases[i].id,
skinId: fields[1],
displayRadius: fields[2],
showSecondHand: fields[3]!='noSeconds',
gmtOffset: fields[4],
showDigital: fields[5]=='showDigital',
logClock: fields[6]=='logClock',
logClockRev: fields[6]=='logClockRev'
});
}
}
};
// If you don't have jQuery then you need a body onload like this: <body onload="CoolClock.findAndCreateClocks()">
// If you do have jQuery and it's loaded already then we can do it right now
if (window.jQuery) jQuery(document).ready(CoolClock.findAndCreateClocks);
i'd like to request that if anyone does make a litecoin version that they use a completely different colour scheme so that it can instantly be distinguished from the bitcoin one at a glance.
