/**
* Apple-Style Flip Counter
* ------------------------
*
* Copyright (c) 2010 Chris Nanney
* http://cnanney.com/journal/code/apple-style-counter-revisited/
* http://cnanney.com/journal/code/apple-style-counter/
*
* Licensed under MIT
* http://www.opensource.org/licenses/mit-license.php
*/
var flipCounter = function(d, options){
// Default values
var defaults = {
value: 0,
inc: 1,
pace: 1000,
auto: true,
debug: false //Uses console.log, so don't enable unless your browser supports it.
};
var o = options || {},
div = d && d != '' ? "#" + d : "#counter";
for (var opt in defaults) o[opt] = (opt in o) ? o[opt] : defaults[opt];
var tFrameHeight = 39,
bFrameHeight = 64,
frameWidth = 53,
digitsOld = [], digitsNew = [], subStart, subEnd, x, y, nextCount = null;
/**
* Sets the value of the counter and animates the digits to new value.
*
* Example: myCounter.setValue(500); would set the value of the counter to 500,
* no matter what value it was previously.
*
* @param {int} n
* New counter value
*/
this.setValue = function(n){
if (isNumber(n)){
x = o.value.toString();
y = n.toString();
o.value = n;
digitCheck(x,y);
}
return this;
};
/**
* Sets the increment for the counter. Does NOT animate digits.
*/
this.setIncrement = function(n){
o.inc = isNumber(n) ? n : defaults.inc;
return this;
};
/**
* Sets the pace of the counter. Only affects counter when auto == true.
*
* @param {int} n
* New pace for counter in milliseconds
*/
this.setPace = function(n){
o.pace = isNumber(n) ? n : defaults.pace;
return this;
};
/**
* Sets counter to auto-incrememnt (true) or not (false).
*
* @param {bool} a
* Should counter auto-increment, true or false
*/
this.setAuto = function(a){
if (a && ! o.atuo){
o.auto = true;
doCount();
}
if (! a && o.auto){
if (nextCount) clearNext();
o.auto = false;
}
return this;
};
/**
* Increments counter by one animation based on set 'inc' value.
*/
this.step = function(){
if (! o.auto) doCount();
return this;
};
/**
* Adds a number to the counter value, not affecting the 'inc' or 'pace' of the counter.
*
* @param {int} n
* Number to add to counter value
*/
this.add = function(n){
if (isNumber(n)){
x = o.value.toString();
o.value += n;
y = o.value.toString();
digitCheck(x,y);
}
return this;
};
/**
* Subtracts a number from the counter value, not affecting the 'inc' or 'pace' of the counter.
*
* @param {int} n
* Number to subtract from counter value
*/
this.subtract = function(n){
if (isNumber(n)){
x = o.value.toString();
o.value -= n;
if (o.value >= 0){
y = o.value.toString();
}
else{
y = "0";
o.value = 0;
}
digitCheck(x,y);
}
return this;
};
/**
* Increments counter to given value, animating by current pace and increment.
*
* @param {int} n
* Number to increment to
* @param {int} t (optional)
* Time duration in seconds - makes increment a 'smart' increment
* @param {int} p (optional)
* Desired pace for counter if 'smart' increment
*/
this.incrementTo = function(n, t, p){
if (nextCount) clearNext();
// Smart increment
if (typeof t != 'undefined'){
var time = isNumber(t) ? t * 1000 : 10000,
pace = typeof p != 'undefined' && isNumber(p) ? p : o.pace,
diff = typeof n != 'undefined' && isNumber(n) ? n - o.value : 0,
cycles, inc, q, nq, check,
i = 0,
best = {
pace: 0,
inc: 0
};
// Initial best guess
pace = (time / diff > pace) ? Math.round((time / diff) / 10) * 10 : pace;
cycles = Math.floor(time / pace);
inc = Math.round(diff / cycles);
q = Math.abs(diff - (cycles * inc)) + Math.abs(cycles * pace - time);
check = checkSmartValues(diff, cycles, inc, pace, time);
// DEBUGGING
/*
if (o.debug){
console.log(
'***************************************************************\n' +
'START: ' + o.value + '\nEND: ' + n + '\n' + check.str
);
}
*/
if (diff > 0){
while (check.result === false && i < 100){
pace += 10;
cycles = Math.floor(time / pace);
inc = Math.round(diff / cycles);
nq = Math.abs(diff - (cycles * inc)) + Math.abs(cycles * pace - time);
check = checkSmartValues(diff, cycles, inc, pace, time);
if (nq < q){
q = nq;
best.pace = pace;
best.inc = inc;
}
// DEBUGGING
/*
if (o.debug){
console.log('ADJUSTMENT: ' + (i + 1) + '\n' + check.str);
}
*/
i++;
}
if (i == 100){
// Could not find optimal settings, use best found so far
o.inc = best.inc;
o.pace = best.pace;
}
else{
// Optimal settings found, use those
o.inc = inc;
o.pace = pace;
}
doIncrement(n, true, cycles);
}
}
// Regular increment
else{
doIncrement(n);
}
}
/**
* Gets current value of counter.
*/
this.getValue = function(){
return o.value;
}
/**
* Stops all running increments.
*/
this.stop = function(){
if (nextCount) clearNext();
return this;
}
//---------------------------------------------------------------------------//
function doCount(){
x = o.value.toString();
o.value += o.inc;
y = o.value.toString();
digitCheck(x,y);
if (o.auto === true) nextCount = setTimeout(doCount, o.pace);
}
function doIncrement(n, s, c){
var val = o.value,
smart = (typeof s == 'undefined') ? false : s,
cycles = (typeof c == 'undefined') ? 1 : c;
if (smart === true) cycles--;
if (val != n){
x = o.value.toString(),
o.auto = true;
if (val + o.inc <= n && cycles != 0) val += o.inc
else val = n;
o.value = val;
y = o.value.toString();
digitCheck(x,y);
nextCount = setTimeout(function(){doIncrement(n, smart, cycles)}, o.pace);
}
else o.auto = false;
}
function digitCheck(x,y){
digitsOld = splitToArray(x);
digitsNew = splitToArray(y);
if (y.length > x.length){
var diff = y.length - x.length;
while (diff > 0){
var adder = 1;
addDigit(y.length - diff + 1, digitsNew[y.length - diff]);
adder++;
diff--;
}
}
if (y.length < x.length){
var diff = x.length - y.length;
while (diff > 0){
var adder = 1;
removeDigit(x.length - diff);
diff--;
}
}
for (var i = 0; i < digitsOld.length; i++){
if (digitsNew[i] != digitsOld[i]){
animateDigit(i, digitsOld[i], digitsNew[i]);
}
}
}
function animateDigit(n, oldDigit, newDigit){
var speed, step = 0, w,
bp = [
'-' + frameWidth + 'px -' + (oldDigit * tFrameHeight) + 'px',
(frameWidth * -2) + 'px -' + (oldDigit * tFrameHeight) + 'px',
'0 -' + (newDigit * tFrameHeight) + 'px',
'-' + frameWidth + 'px -' + (oldDigit * bFrameHeight) + 'px',
(frameWidth * -2) + 'px -' + (newDigit * bFrameHeight) + 'px',
(frameWidth * -3) + 'px -' + (newDigit * bFrameHeight) + 'px',
'0 -' + (newDigit * bFrameHeight) + 'px'
];
if (o.auto === true && o.pace <= 300){
switch (n){
case 0:
speed = o.pace/6;
break;
case 1:
speed = o.pace/5;
break;
case 2:
speed = o.pace/4;
break;
case 3:
speed = o.pace/3;
break;
default:
speed = o.pace/2;
break;
}
}
else{
speed = 80;
}
// Cap on slowest animation can go
speed = (speed > 80) ? 80 : speed;
function animate(){
if (step < 7){
w = step < 3 ? 't' : 'b';
jQuery(div + " #d" + n + " li." + w).css("background-position", bp[step]);
step++;
if (step != 3) setTimeout(animate, speed);
else animate();
}
}
animate();
}
// Creates array of digits for easier manipulation
function splitToArray(input){
var digits = new Array();
for (var i = 0; i < input.length; i++){
subStart = input.length - (i + 1);
subEnd = input.length - i;
digits[i] = input.substring(subStart, subEnd);
}
return digits;
}
// Adds new digit
function addDigit(len, digit){
var li = Number(len) - 1;
if (li % 3 == 0) jQuery(div).prepend('');
jQuery(div).prepend('');
jQuery(div + " #d" + li + " li.t").css({'background-position': '0 -' + (digit * tFrameHeight) + 'px'});
jQuery(div + " #d" + li + " li.b").css({'background-position': '0 -' + (digit * bFrameHeight) + 'px'});
}
// Removes digit
function removeDigit(id){
jQuery(div + " #d" + id).remove();
// Check for leading comma
var first = jQuery(div + " li").first();
if (first.hasClass("s")) first.parent("ul").remove();
}
// Sets the correct digits on load
function initialDigitCheck(initial){
// Creates the right number of digits
var count = initial.toString().length;
var bit = 1;
for (var i = 0; i < count; i++){
jQuery(div).prepend('');
if (bit != (count) && bit % 3 == 0) jQuery(div).prepend('');
bit++;
}
// Sets them to the right number
var digits = splitToArray(initial.toString());
for (var i = 0; i < count; i++){
jQuery(div + " #d" + i + " li.t").css({'background-position': '0 -' + (digits[i] * tFrameHeight) + 'px'});
jQuery(div + " #d" + i + " li.b").css({'background-position': '0 -' + (digits[i] * bFrameHeight) + 'px'});
}
// Do first animation
if (o.auto === true) nextCount = setTimeout(doCount, o.pace);
}
// Checks values for smart increment and creates debug text
function checkSmartValues(diff, cycles, inc, pace, time){
var r = {result: true};
// Test conditions, all must pass to continue:
// 1: Unrounded inc value needs to be at least 1
r.cond1 = (diff / cycles >= 1) ? true : false;
// 2: Don't want to overshoot the target number
r.cond2 = (cycles * inc <= diff) ? true : false;
// 3: Want to be within 5 of the target number
r.cond3 = (Math.abs(cycles * inc - diff) <= 5) ? true : false;
// 4: Total time should be within 100ms of target time.
r.cond4 = (Math.abs(cycles * pace - time) <= 100) ? true : false;
// 5: Calculated time should not be over target time
r.cond5 = (cycles * pace <= time) ? true : false;
// DEBUGGING
//r.str = 'Condition Checks:\n';
for (var i = 1; i <= 5; i++){
//r.str += i + ': ';
if (r['cond' + i] === false){
//r.str += 'FAIL';
r.result = false;
}
/*
else{
r.str += 'PASS';
}
r.str += i < 5 ? ', ' : '';
*/
}
// DEBUGGING
/*
r.str += '\n----\n Pace: ' + pace +
'\n Cycles: ' + cycles +
'\n Calculated Inc: ' + (diff / cycles) +
'\n Rounded Inc: ' + inc +
'\n Calculated time: ' + Math.abs(cycles * pace) +
'\n Target time: ' + time +
'\n ACTUAL END VALUE: ' + (cycles*inc+o.value);
*/
return r;
}
// http://stackoverflow.com/questions/18082/validate-numbers-in-javascript-isnumeric/1830844
function isNumber(n) {
return !isNaN(parseFloat(n)) && isFinite(n);
}
function clearNext(){
clearTimeout(nextCount);
nextCount = null;
}
// Start it up
initialDigitCheck(o.value);
};