public int SymbolWidthAspectRatio { get; set; }
An Int32 that indicate the width part of the aspect ratio for the symbol. Must be a value greater than or equal to 1. The default value is 2.
Aspect ratio to use when writing PDF417 symbols is "Symbol height aspect ratio" divided by "Symbol width aspect ratio" or SymbolHeightAspectRatio/ SymbolWidthAspectRatio. The default values for these properties is 1 and 2 respectively. Therefore, the default aspect ratio is 1/2 or 0.5
Only used when the value of LimitByRowsAndColumns is false.
For more information, refer to Writing Barcodes - Bounds and XModule.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Barcode;
using Leadtools.ImageProcessing;
public void PDF417Barcode_Example()
{
string imageFileName = Path.Combine(LEAD_VARS.ImagesDir, "MyPDF417Barcodes.tif");
BarcodeEngine engine = new BarcodeEngine();
// Create the image to write the barcodes to
int resolution = 300;
using (RasterImage image = RasterImage.Create((int)(8.5 * resolution), (int)(11.0 * resolution), 1, resolution, RasterColor.FromKnownColor(RasterKnownColor.White)))
{
// Write two PDF417 barcodes
WriteBarcode(engine.Writer, image, "DATA1", 10, 10, true);
WriteBarcode(engine.Writer, image, "DATA2", 20, 20, false);
// Save the image
using (RasterCodecs codecs = new RasterCodecs())
{
codecs.Save(image, imageFileName, RasterImageFormat.CcittGroup4, 1);
}
}
// Now read the barcodes again
using (RasterCodecs codecs = new RasterCodecs())
{
using (RasterImage image = codecs.Load(imageFileName))
{
ReadBarcodes(engine.Reader, image);
}
}
}
private void WriteBarcode(BarcodeWriter writer, RasterImage image, string value, int rows, int columns, bool topLeft)
{
// Create the barcode data
PDF417BarcodeData barcode = new PDF417BarcodeData();
barcode.Value = value;
barcode.Group = 0;
barcode.Symbology = BarcodeSymbology.PDF417;
// We will use the alignment to position the barcodes, so use all of the image
barcode.Bounds = new LeadRect(0, 0, image.ImageWidth, image.ImageHeight);
// Set the write options
PDF417BarcodeWriteOptions options = new PDF417BarcodeWriteOptions();
if (topLeft)
{
options.HorizontalAlignment = BarcodeAlignment.Near;
options.VerticalAlignment = BarcodeAlignment.Near;
}
else
{
options.HorizontalAlignment = BarcodeAlignment.Far;
options.VerticalAlignment = BarcodeAlignment.Far;
}
options.Truncated = false;
options.EnableGroupMode = false;
options.SymbolWidthAspectRatio = 2;
options.SymbolHeightAspectRatio = 1;
options.LimitByRowsAndColumns = true;
options.Rows = rows;
options.Columns = columns;
options.XModule = 30;
options.XModuleAspectRatio = 3;
options.ECCLevel = PDF417BarcodeECCLevel.Level0;
options.ECCPercentage = 0;
// Write it
Console.WriteLine("Writing barcode with symbol rows/columns: {0}/{1} and Data: {2}", rows, columns, value);
writer.WriteBarcode(image, barcode, options);
}
private void ReadBarcodes(BarcodeReader reader, RasterImage image)
{
// Setup read options
PDF417BarcodeReadOptions options = new PDF417BarcodeReadOptions();
options.SearchDirection = BarcodeSearchDirection.Horizontal;
options.EnableDoublePass = false;
options.EnableFastMode = false;
options.ReadMode = PDF417BarcodeReadMode.Mode0;
options.ReturnCorruptedSymbolArea = false;
options.ReadOptionalMacroFileNameField = false;
options.ReadOptionalMacroSegmentCountField = false;
options.ReadOptionalMacroTimestampField = false;
options.ReadOptionalMacroSenderField = false;
options.ReadOptionalMacroAddresseeField = false;
options.ReadOptionalMacroFileSizeField = false;
options.ReadOptionalMacroChecksumField = false;
options.ReadOptionalMacro79AndAZField = false;
options.EnableDoublePassIfSuccess = true;
options.EnableNoIndicatorTrail = true;
options.EnablePreprocessing = true;
Console.WriteLine("Reading Barcodes");
BarcodeData[] barcodes = reader.ReadBarcodes(image, LeadRect.Empty, 0, new BarcodeSymbology[] { BarcodeSymbology.PDF417 }, new BarcodeReadOptions[] { options });
Console.WriteLine("{0} barcodes found:", barcodes.Length);
foreach (PDF417BarcodeData barcode in barcodes)
{
Console.WriteLine(" At {0} data: {1} and symbology: {2}", barcode.Bounds, barcode.Value, barcode.Symbology);
}
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";
}