shuffle card game

[jbum]

Here's a modified version of your code that will do it. I was able to shorten your code a bit by using the same function for shuffling the cards to perform the initial placement.

code:

---

// Some Useful constants - better to encode these up here

// than to have them as literals inside your code...

kLeftMargin = 80;

kTopMargin = 80;

kCellWidth = 70;

kCellHeight = 70;

kNbrColumns = 4;

kNbrRows = 4;

kTotalCards = kNbrColumns*kNbrRows;



// The basic trick:

// You can convert a single number n to a pair of card indexes (x,y)

// using x  = (n % kNbrColumns) and y = int(x/kNbrColumns)

// I use this technique a couple of times below.



// Function to place cards in random order

ShuffleAndDeal = function()

{

  // create an array of card indexes

	shuffleOrder = [];

	for (var i = 0; i < kTotalCards; ++i) {

		shuffleOrder[i] = i;

	}

  // shuffle the array using a random sort

	shuffleOrder.sort(function(){ return random(2)? -1 : 1});

	trace("Order: " + shuffleOrder);



	// use the array to select cards

	for (var i = 0; i < kTotalCards; ++i) 

	{

		r = shuffleOrder[i];



		// card index

		// note: if your cards were numbered consecutively (0,1,2) then you

		// could simply use 'r' and don't need to compute rx,ry

	  rx = r % kNbrColumns;

	  ry = int(r/kNbrColumns);



		// position on board

	  ix = i % kNbrColumns;

	  iy = int(i/kNbrColumns);

		piece = _root[ry+"-"+rx];

		piece._x = kLeftMargin + iy*kCellWidth;

		piece._y = kTopMargin + ix*kCellHeight;

	}

}



stop();

ShuffleAndDeal(); // initial placement



press_mc.onRelease = function() {

  ShuffleAndDeal();

}

---

- Jim Bumgardner

EDIT: I've modified the code a few times as I thought of optimizations.