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#1 Posted : Friday, September 13, 2019 10:15:26 AM(UTC)


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This code tip will cover how to use the AutoCropRectangleCommand in conjunction with the CropCommand to control which side(s) of an image get cropped.

The AutoCropRectangleCommand is used to get the rectangle to be used to trim the image if AutoCropCommand were used. Use this command in conjunction with CropCommand instead of AutoCropCommand when you want to modify the trim rectangle. For example, you could let the user preview the rectangle, or you could add a margin.

The CropCommand is used to crop a RasterImage

First, an enum is needed to be declared so the side(s) to be cropped can be controlled. The Enum will be a flag so more than 1 side can be used (i.e. only want left and right sides trimmed and leave the top and bottom):

      public enum CropSide
         None = 0,
         Left = 1 << 0,
         Top = 1 << 1,
         Right = 1 << 2,
         Bottom = 1 << 3,
         All = ~(-1 << 4)

Then, the method is declared where we utilize the 2 RasterCommands above:

      static void AutoCropSideCommand(RasterImage image, CropSide autoCropSide)
         AutoCropRectangleCommand autoCropRectangleCommand = new AutoCropRectangleCommand();

         LeadRect cropRect = autoCropRectangleCommand.Rectangle;

         new CropCommand
            Rectangle = new LeadRect(
               autoCropSide.HasFlag(CropSide.Left) ? cropRect.X : 0,
               autoCropSide.HasFlag(CropSide.Top) ? cropRect.Y : 0,
               autoCropSide.HasFlag(CropSide.Right) ? cropRect.Width : image.Width,
               autoCropSide.HasFlag(CropSide.Bottom) ? cropRect.Height : image.Height)

Finally, you can then call this code via:

         string fileName = @"sample.png";
         string outputFile = @"sample_autocrop.png";

         using (RasterCodecs codecs = new RasterCodecs())
         using (RasterImage image = codecs.Load(fileName, 1))
            AutoCropSideCommand(image, CropSide.Bottom);
            codecs.Save(image, outputFile, RasterImageFormat.Png, 0);
Hadi Chami
Developer Support Manager
LEAD Technologies, Inc.


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