Class CanvasBarcodeExtensions

Namespace

Egami.Barcodes

Assembly

Egami.Barcodes.dll

Draws barcodes on any Canvas: rasters, PDF and SVG pages, recordings.

public static class CanvasBarcodeExtensions

Inheritance

object

CanvasBarcodeExtensions

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Examples

using Raster<Rgba8> label = Raster.Create(300, 200, Rgba8.White);
using (RasterCanvas<Rgba8> canvas = label.CreateCanvas())
{
    // Fitted into the rectangle and centered, quiet zone inside it; on a raster, modules snap to whole pixels.
    canvas.DrawBarcode(qr, new RectF(20, 20, 160, 160), Rgba8.Black);
}

Methods

DrawBarcode(Canvas, Barcode, RectF, Paint, BarcodeDrawOptions?)

Draws a barcode fitted into a rectangle and centered in it, as one filled path, with its quiet zone kept clear inside the rectangle. 2D symbols keep square modules; linear bars fill the rectangle's height, less the text line. On a raster canvas with no rotation or skew, modules snap to whole pixels (as large as still fit), so edges stay sharp.

public static void DrawBarcode(this Canvas canvas, Barcode barcode, RectF rect, Paint paint, BarcodeDrawOptions? options = null)

Parameters

canvas Canvas

The canvas.

barcode Barcode

The barcode.

rect RectF

The rectangle, in local coordinates.

paint Paint

The paint for the bars and the text.

options BarcodeDrawOptions

The quiet zone, bar width reduction and font, or null for Default.

Examples

using Raster<Rgba8> label = Raster.Create(300, 200, Rgba8.White);
using (RasterCanvas<Rgba8> canvas = label.CreateCanvas())
{
    // Fitted into the rectangle and centered, quiet zone inside it; on a raster, modules snap to whole pixels.
    canvas.DrawBarcode(qr, new RectF(20, 20, 160, 160), Rgba8.Black);
}

DrawBarcode(Canvas, Barcode, Vector2, float, Paint, BarcodeDrawOptions?)

Draws a barcode at a given module size, with the top-left corner of its quiet zone at a point. Linear bars are Height modules tall. On a raster canvas with no rotation or skew, the module size rounds to whole pixels and the symbol to the pixel grid, so edges stay sharp.

public static void DrawBarcode(this Canvas canvas, Barcode barcode, Vector2 origin, float moduleSize, Paint paint, BarcodeDrawOptions? options = null)

Parameters

canvas Canvas

The canvas.

barcode Barcode

The barcode.

origin Vector2

The top-left corner of the quiet zone, in local coordinates.

moduleSize float

The width of a module in local units, the X dimension of the standards.

paint Paint

The paint for the bars and the text.

options BarcodeDrawOptions

The quiet zone, bar width reduction and font, or null for Default.

Examples

// A 0.33 mm module (the X dimension) in points, with the text under the bars and 0.05 mm taken off each bar
// for ink spread. The quiet zone's top-left corner goes at (36, 36).
float module = 0.33f / 25.4f * 72;
page.DrawBarcode(code, new Vector2(36, 36), module, Rgba8.Black, new BarcodeDrawOptions
{
    Font = font,
    BarWidthReduction = 0.05f / 25.4f * 72,
});

Exceptions

ArgumentOutOfRangeException

moduleSize is not positive and finite.