Praji’s Weblog

At first when my friend put his name upside down in orkut, I was actually amazed. How it is done ??

Its just abusing the unicode, I wonder  which head this actually behind this wonder idea.

Each character is mapped to some other unicode character which resembles as if the character is put upside down.

The mapping is done based on the below given chart.

Mapping

Since it is a bit difficult to map these manually, people started writing their on scripts for this. Such a sample script is given below.

JavaScript Code

For the JavaScript hackers out there, here’s some code to test with (code from revfad):

function flipString(aString)
{
	var last = aString.length - 1;
	//Thanks to Brook Monroe for the
	//suggestion to use Array.join
	var result = new Array(aString.length)
	for (var i = last; i >= 0; --i)
	{
		var c = aString.charAt(i)
		var r = flipTable[c]
		result[last - i] = r != undefined ? r : c
	}
	return result.join('')
}

var flipTable = {
'\u0021' : '\u00A1',
'\u0022' : '\u201E',
'\u0026' : '\u214B',
'\u0027' : '\u002C',
'\u0028' : '\u0029',
'\u002E' : '\u02D9',
'\u0033' : '\u0190',
'\u0034' : '\u152D',
'\u0036' : '\u0039',
'\u0037' : '\u2C62',
'\u003B' : '\u061B',
'\u003C' : '\u003E',
'\u003F' : '\u00BF',
'\u0041' : '\u2200',
'\u0042' : '\u10412',
'\u0043' : '\u2183',
'\u0044' : '\u25D6',
'\u0045' : '\u018E',
'\u0046' : '\u2132',
'\u0047' : '\u2141',
'\u004A' : '\u017F',
'\u004B' : '\u22CA',
'\u004C' : '\u2142',
'\u004D' : '\u0057',
'\u004E' : '\u1D0E',
'\u0050' : '\u0500',
'\u0051' : '\u038C',
'\u0052' : '\u1D1A',
'\u0054' : '\u22A5',
'\u0055' : '\u2229',
'\u0056' : '\u1D27',
'\u0059' : '\u2144',
'\u005B' : '\u005D',
'\u005F' : '\u203E',
'\u0061' : '\u0250',
'\u0062' : '\u0071',
'\u0063' : '\u0254',
'\u0064' : '\u0070',
'\u0065' : '\u01DD',
'\u0066' : '\u025F',
'\u0067' : '\u0183',
'\u0068' : '\u0265',
'\u0069' : '\u0131',
'\u006A' : '\u027E',
'\u006B' : '\u029E',
'\u006C' : '\u0283',
'\u006D' : '\u026F',
'\u006E' : '\u0075',
'\u0072' : '\u0279',
'\u0074' : '\u0287',
'\u0076' : '\u028C',
'\u0077' : '\u028D',
'\u0079' : '\u028E',
'\u007B' : '\u007D',
'\u203F' : '\u2040',
'\u2045' : '\u2046',
'\u2234' : '\u2235'
}

for (i in flipTable)
{
	flipTable[flipTable[i]] = i
}