/// <summary> <p>Like {@link #decodeRow(int, BitArray, java.util.Hashtable)}, but
/// allows caller to inform method about where the UPC/EAN start pattern is
/// found. This allows this to be computed once and reused across many implementations.</p>
/// </summary>
public virtual Result decodeRow(int rowNumber, BitArray row, int[] startGuardRange, System.Collections.Hashtable hints)
{
ResultPointCallback resultPointCallback = hints == null?null:(ResultPointCallback)hints[DecodeHintType.NEED_RESULT_POINT_CALLBACK];
if (resultPointCallback != null)
{
resultPointCallback.foundPossibleResultPoint(new ResultPoint((startGuardRange[0] + startGuardRange[1]) / 2.0f, rowNumber));
}
System.Text.StringBuilder result = decodeRowStringBuffer;
result.Length = 0;
int endStart = decodeMiddle(row, startGuardRange, result);
if (resultPointCallback != null)
{
resultPointCallback.foundPossibleResultPoint(new ResultPoint(endStart, rowNumber));
}
int[] endRange = decodeEnd(row, endStart);
if (resultPointCallback != null)
{
resultPointCallback.foundPossibleResultPoint(new ResultPoint((endRange[0] + endRange[1]) / 2.0f, rowNumber));
}
// Make sure there is a quiet zone at least as big as the end pattern after the barcode. The
// spec might want more whitespace, but in practice this is the maximum we can count on.
int end = endRange[1];
int quietEnd = end + (end - endRange[0]);
if (quietEnd >= row.Size || !row.isRange(end, quietEnd, false))
{
throw ReaderException.Instance;
}
System.String resultString = result.ToString();
if (!checkChecksum(resultString))
{
throw ReaderException.Instance;
}
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
float left = (float)(startGuardRange[1] + startGuardRange[0]) / 2.0f;
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
float right = (float)(endRange[1] + endRange[0]) / 2.0f;
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
return(new Result(resultString, null, new ResultPoint[] { new ResultPoint(left, (float)rowNumber), new ResultPoint(right, (float)rowNumber) }, BarcodeFormat));
}
/// <summary>
/// <p>This is called when a horizontal scan finds a possible alignment pattern. It will
/// cross check with a vertical scan, and if successful, will see if this pattern had been
/// found on a previous horizontal scan. If so, we consider it confirmed and conclude we have
/// found the alignment pattern.</p>
/// </summary>
/// <param name="stateCount"> reading state module counts from horizontal scan </param>
/// <param name="i"> row where alignment pattern may be found </param>
/// <param name="j"> end of possible alignment pattern in row </param>
/// <returns> <seealso cref="AlignmentPattern"/> if we have found the same pattern twice, or null if not </returns>
private AlignmentPattern handlePossibleCenter(int[] stateCount, int i, int j)
{
int stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2];
float centerJ = centerFromEnd(stateCount, j);
float centerI = crossCheckVertical(i, (int)centerJ, 2 * stateCount[1], stateCountTotal);
if (!float.IsNaN(centerI))
{
float estimatedModuleSize = (float)(stateCount[0] + stateCount[1] + stateCount[2]) / 3.0f;
foreach (AlignmentPattern center in possibleCenters)
{
// Look for about the same center and module size:
if (center.aboutEquals(estimatedModuleSize, centerI, centerJ))
{
return(center.combineEstimate(centerI, centerJ, estimatedModuleSize));
}
}
// Hadn't found this before; save it
AlignmentPattern point = new AlignmentPattern(centerJ, centerI, estimatedModuleSize);
possibleCenters.Add(point);
if (resultPointCallback != null)
{
resultPointCallback.foundPossibleResultPoint(point);
}
}
return(null);
}
/// <summary>
/// <p>Like <seealso cref="#decodeRow(int, BitArray, java.util.Map)"/>, but
/// allows caller to inform method about where the UPC/EAN start pattern is
/// found. This allows this to be computed once and reused across many implementations.</p>
/// </summary>
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: public com.google.zxing.Result decodeRow(int rowNumber, com.google.zxing.common.BitArray row, int[] startGuardRange, java.util.Map<com.google.zxing.DecodeHintType,?> hints) throws com.google.zxing.NotFoundException, com.google.zxing.ChecksumException, com.google.zxing.FormatException
public virtual Result decodeRow(int rowNumber, BitArray row, int[] startGuardRange, IDictionary <DecodeHintType, object> hints)
{
//ResultPointCallback resultPointCallback = hints == null ? null : (ResultPointCallback) hints[DecodeHintType.NEED_RESULT_POINT_CALLBACK];
ResultPointCallback resultPointCallback = null;
if (hints != null && hints.ContainsKey(DecodeHintType.NEED_RESULT_POINT_CALLBACK))
{
resultPointCallback = (ResultPointCallback)hints[DecodeHintType.NEED_RESULT_POINT_CALLBACK];
}
if (resultPointCallback != null)
{
resultPointCallback.foundPossibleResultPoint(new ResultPoint((startGuardRange[0] + startGuardRange[1]) / 2.0f, rowNumber));
}
StringBuilder result = decodeRowStringBuffer;
result.Length = 0;
int endStart = decodeMiddle(row, startGuardRange, result);
if (resultPointCallback != null)
{
resultPointCallback.foundPossibleResultPoint(new ResultPoint(endStart, rowNumber));
}
int[] endRange = decodeEnd(row, endStart);
if (resultPointCallback != null)
{
resultPointCallback.foundPossibleResultPoint(new ResultPoint((endRange[0] + endRange[1]) / 2.0f, rowNumber));
}
// Make sure there is a quiet zone at least as big as the end pattern after the barcode. The
// spec might want more whitespace, but in practice this is the maximum we can count on.
int end = endRange[1];
int quietEnd = end + (end - endRange[0]);
if (quietEnd >= row.Size || !row.isRange(end, quietEnd, false))
{
throw NotFoundException.NotFoundInstance;
}
string resultString = result.ToString();
if (!checkChecksum(resultString))
{
throw ChecksumException.ChecksumInstance;
}
float left = (float)(startGuardRange[1] + startGuardRange[0]) / 2.0f;
float right = (float)(endRange[1] + endRange[0]) / 2.0f;
BarcodeFormat format = BarcodeFormat;
Result decodeResult = new Result(resultString, null, new ResultPoint[] { new ResultPoint(left, (float)rowNumber), new ResultPoint(right, (float)rowNumber) }, format); // no natural byte representation for these barcodes
try
{
Result extensionResult = extensionReader.decodeRow(rowNumber, row, endRange[1]);
decodeResult.putMetadata(ResultMetadataType.UPC_EAN_EXTENSION, extensionResult.Text);
decodeResult.putAllMetadata(extensionResult.ResultMetadata);
decodeResult.addResultPoints(extensionResult.ResultPoints);
}
catch (ReaderException re)
{
// continue
}
if (format == BarcodeFormat.EAN_13 || format == BarcodeFormat.UPC_A)
{
string countryID = eanManSupport.lookupCountryIdentifier(resultString);
if (countryID != null)
{
decodeResult.putMetadata(ResultMetadataType.POSSIBLE_COUNTRY, countryID);
}
}
return(decodeResult);
}