memblox/makelist.html at master · watcherdm/memblox · GitHub

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <meta http-equiv="content-type" content="text/html; charset=windows-1250">
  <meta name="generator" content="PSPad editor, www.pspad.com">
  <title></title>
<script type="text/javascript">
	var stream = [4, 6, 8];

	// Builds a stream of values.
	//
	// deck array - an array of values to pick from.
	// minBuffer - the min number of places that separate pairs.
	// maxBuffer - the max number of places that separate pairs.
	// maxStream - the number of values to be in the returned stream (must be a multiple of 2!)
	//
	// return array - the stream of values with length maxStream.
	function makeStream(deck, minBuffer, maxBuffer, maxStream)
	{
		// The array to be returned with stream.
		var values = [];

		var size = deck.length;

		// Values that are on the board that still await matches.
		var buffer = [];

		for(var i = 0; i < maxStream; i++)
		{
			var useBuffer = Math.round(Math.random());

			// If we have enough numbers, empty buffer and we're finished.
			if(buffer.length+values.length == maxStream)
			{
				while(buffer.length > 0)
				{
					var nextNumber = buffer.splice(Math.floor(Math.random()*buffer.length), 1);
					values.push(nextNumber);
				}

				return values;
			}

			if(buffer.length >= maxBuffer || (useBuffer == 1 && buffer.length >= minBuffer))
			{
				// If we max the buffer or we randomly choose to, take a buffer value.
				var nextNumber = buffer.splice(Math.floor(Math.random()*buffer.length), 1);
				values.push(nextNumber);
			}
			else
			{
				// Pick a random value from the deck.  Add it to the buffer for its match.
				var nextNumber = deck[Math.floor(Math.random()*deck.length)];
				values.push(nextNumber);
				buffer.push(nextNumber);
			}
		}

		return values;
	}

	// Returns the next item in the stream.
	function getNextItem()
	{
		return stream.shift();
	}

	function testMakeStream()
	{
		stream = makeStream([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 3, 10, 20);
		alert(stream);
	}

</script>
  </head>
  <body>
	<input type="button" onclick="testMakeStream();" value="Make new stream" />
  </body>
</html>