Bitmap rotation in Xamarin.Android

Question

How do you rotate Bitmap by 90 degrees in Xamarin.Android? I am using ZXing.Net.Mobile, C#/.NET Barcode Scanning Library and would like to print barcode vertically. Thanks in advance.

check this: https://stackoverflow.com/questions/9015372/how-to-rotate-a-bitmap-90-degrees — Jaydeep Devda, Jun 07 '17 at 11:17
I checked it. Unfortunately, there was no ZXing example provided. — mrisek, Jun 20 '17 at 12:50

score 2 · Accepted Answer · answered Jun 07 '17 at 15:51

Once you have the barcode bitmap:

var barcodeWriter = new ZXing.Mobile.BarcodeWriter
{
    Format = ZXing.BarcodeFormat.CODE_128,
    Options = new ZXing.Common.EncodingOptions
    {
        Width = 300,
        Height = 300
    }
};

var barcode = barcodeWriter.Write("ZXing.Net.Mobile");

You can rotate it with this:

var barcodeRotated = RotateImage(barcode, 90);

Here's the function:

private Bitmap RotateImage(Bitmap src, float degrees)
{
    var matrix = new Matrix();

    matrix.PostRotate(degrees);

    return Bitmap.CreateBitmap(src, 0, 0, src.Width, src.Height, matrix, true);
}

Result:

Hope this helps!

Thanks, this is the easiest way to rotate Bitmap image. – mrisek Jun 12 '17 at 11:58 — mrisek, Jun 12 '17 at 11:58

Bitmap rotation in Xamarin.Android

1 Answers1