array manipulation

[charlie_says]

i have been designing screens for my tile based game, and having got a little tired with typing in lots of numbers to an array, I made myself a little tile editor.
then I hit a little snag, which I'm sure someone must have come across before. Some of my screens are essentially the same altho flipped across an axis- now I could just remake them, it won't take too long, ut it seemd to me to be a good solution to create a flip button in my tile editor.
Can someone tell me good way of flipping a 2 dimensional array, both horizontally AND vertically (altho as separate operations?)
Thanks.

[BlinkOk]

This code assumes that each horizontal array is of the same length.
vertically;

var t, bEntry, eEntry;
var begin = 0;
var end = myArray.length - 1;
var l = myArray[0].length;
do {
 bEntry = myArray[begin];
 eEntry = myArray[end];
 for(i=0;i<l;i++) {
  t = bEntry[i];
  bEntry[i] = eEntry[i];
  eEntry[i] = t;
 }
} while(--end > ++begin);

horizontally;

var t;
var begin = 0;
var end = myArray[0].length - 1;
var l = myArray.length;
do {
 for(i=0;i<l;i++) {
  t = myArray[i][begin];
  myArray[i][begin] = myArray[i][end];
  myArray[i][end] = t;
 }
} while(--end > ++begin);

[charlie_says]

sweet...
you've probably saved me about a million hours work there.
thankyou!

[ant512]

This might come in handy, too. It will rotate a 2-dimensional array 90 degrees either clockwise or anti-clockwise. You just need to pass it an array (first parameter) and a direction (second parameter; 1 for clockwise, and any othe r value for anti-clockwise). It returns the rotated array.

Though the two dimensions can be of different lengths, the array cannot be jagged.

code:

---

function RotateArray(myArray, rotateDirection) {

	

	// Create temporary array

	tempArray = new Array();

	for (a = 0; a < myArray[0].length; a++) {

		tempArray[a] = new Array();

	}

	

	// Create variables to store current position in temporary array

	ny = 0;

	nx = 0;

	if (rotateDirection == 1) {

	

		// Perform clockwise rotation

		for (x = 0; x < myArray[0].length; x++) {

			for (y = myArray.length-1; y >= 0; y--) {

				tempArray[ny][nx] = myArray[y][x];

				nx++;

			}

			ny++;

			nx = 0;

		}

		

	} else {

	

		// Perform anti-clockwise rotation

		for (x = myArray[0].length-1; x >= 0; x--) {

			for (y = 0; y < myArray.length; y++) {

				tempArray[ny][nx] = myArray[y][x];

				nx++;

			}

			ny++;

			nx = 0;

		}

	}

	

	return tempArray;

}

---