Function AlignmentPatternFinder

src/alignpat.js:65–279

( image,  startX,  startY,  width,  height,  moduleSize,  resultPointCallback)

}

function AlignmentPatternFinder( image,  startX,  startY,  width,  height,  moduleSize,  resultPointCallback)
{
	this.image = image;
	this.possibleCenters = new Array();
	this.startX = startX;
	this.startY = startY;
	this.width = width;
	this.height = height;
	this.moduleSize = moduleSize;
	this.crossCheckStateCount = new Array(0,0,0);
	this.resultPointCallback = resultPointCallback;
	
	this.centerFromEnd=function(stateCount,  end)
		{
			return  (end - stateCount[2]) - stateCount[1] / 2.0;
		}
	this.foundPatternCross = function(stateCount)
		{
			var moduleSize = this.moduleSize;
			var maxVariance = moduleSize / 2.0;
			for (var i = 0; i < 3; i++)
			{
				if (Math.abs(moduleSize - stateCount[i]) >= maxVariance)
				{
					return false;
				}
			}
			return true;
		}

	this.crossCheckVertical=function( startI,  centerJ,  maxCount,  originalStateCountTotal)
		{
			var image = this.image;
			
			var maxI = qrcode.height;
			var stateCount = this.crossCheckStateCount;
			stateCount[0] = 0;
			stateCount[1] = 0;
			stateCount[2] = 0;
			
			// Start counting up from center
			var i = startI;
			while (i >= 0 && image[centerJ + i*qrcode.width] && stateCount[1] <= maxCount)
			{
				stateCount[1]++;
				i--;
			}
			// If already too many modules in this state or ran off the edge:
			if (i < 0 || stateCount[1] > maxCount)
			{
				return NaN;
			}
			while (i >= 0 && !image[centerJ + i*qrcode.width] && stateCount[0] <= maxCount)
			{
				stateCount[0]++;
				i--;
			}
			if (stateCount[0] > maxCount)