/// <summary>
/// Get skew angle
/// </summary>
/// <param name="bitmap">Bitmap</param>
/// <param name="exludeBorders">Excluding borders from reaserch</param>
/// <param name="percentageOfExcludableBorders">Percent of excluded borders</param>
/// <returns></returns>
public static float GetSkewAngle(Bitmap bitmap, bool exludeBorders = false, int percentageOfExcludableBorders = 0)
{
GdPictureImaging image = new GdPictureImaging();
float angle = 0;
try
{
int imageId = image.CreateGdPictureImageFromBitmap(bitmap);
if (imageId > 0)
{
if (exludeBorders)
{
int width = image.GetWidth(imageId);
int height = image.GetHeight(imageId);
int left = width / 100 * percentageOfExcludableBorders;
int top = width / 100 * percentageOfExcludableBorders;
image.Crop(imageId, left, top, width - 2 * left, height - 2 * top);
}
angle = image.GetSkewAngle(imageId, MaxAngleOfDeskewResearch, AngleResearchStep, true);
image.ReleaseGdPictureImage(imageId);
}
}
catch (Exception e)
{
}
return(angle);
}
/// <summary>
/// Crops the specified bitmap
/// </summary>
/// <param name="bitmap">Bitmap</param>
/// <param name="rectangle">Rectangle</param>
/// <returns></returns>
public static Bitmap Crop(Bitmap bitmap, Rectangle rectangle)
{
Bitmap resultImage = bitmap;
GdPictureImaging image = new GdPictureImaging();
int imageId = image.CreateGdPictureImageFromBitmap(bitmap);
if (imageId > 0)
{
image.Crop(imageId, rectangle.Left, rectangle.Top, rectangle.Width, rectangle.Height);
resultImage = image.GetBitmapFromGdPictureImage(imageId).CloneSmart(image.GetPixelFormat(imageId));
image.ReleaseGdPictureImage(imageId);
}
return(resultImage);
}
public string GetImages(Params par)
{
string path = System.Web.HttpContext.Current.Server.MapPath(par.path);
List <AnnotationJSON> res = new List <AnnotationJSON>();
GdPicturePDF pdf = new GdPicturePDF();
AnnotationManager an = new AnnotationManager();
GdPictureImaging im = new GdPictureImaging();
int width = 0;
int height = 0;
int left = 0;
int top = 0;
pdf.SetOrigin(PdfOrigin.PdfOriginTopLeft);
pdf.SetMeasurementUnit(PdfMeasurementUnit.PdfMeasurementUnitInch);
//this API is only works for PDF files , if you need to process image based files you could implement similar logic using GdPictureImaging
//instead of GdPicturePDF
pdf.LoadFromFile(path, false);
an.InitFromGdPicturePDF(pdf);
for (int i = 1; i <= pdf.GetPageCount(); i++)
{
an.SelectPage(i);
int count = an.GetAnnotationCount();
if (count > 0)
{
List <Annotation> ans = new List <Annotation>();
for (int m = 0; m < count; m++)
{
Annotation annot = an.GetAnnotationFromIdx(m);
annot.Rotation = 0;
ans.Add(annot);
}
an.BurnAnnotationsToPage(false);
//we render PDF page to an image to crop
int imageNr = pdf.RenderPageToGdPictureImage(300, false);
for (int y = 0; y < count; y++)
{
//we copy the same image so we can crop it and send back
int imageCrop = im.CreateClonedGdPictureImage(imageNr);
Annotation annot = ans[y];
//conversion from inches to pixels
left = (int)Math.Ceiling(annot.Left * 300 + 0.5);
top = (int)Math.Ceiling(annot.Top * 300 + 0.5);
width = (int)Math.Ceiling(annot.Width * 300 + 0.5);
height = (int)Math.Ceiling(annot.Height * 300 + 0.5);
//cropping the immage to get snapshot of the annotation
im.Crop(imageCrop, left - width / 2, top - height / 2, width, height);
//rescale the image to 20%
im.Scale(imageCrop, 20, System.Drawing.Drawing2D.InterpolationMode.High);
//prepare image and send it as base64
byte[] arr = { };
int length = 0;
im.SaveAsByteArray(imageCrop, ref arr, ref length, GdPicture14.DocumentFormat.DocumentFormatJPEG, 100);
string bs = System.Convert.ToBase64String(arr);
AnnotationJSON json = new AnnotationJSON();
json.Image = bs;
res.Add(json);
//releasing the resources
im.ReleaseGdPictureImage(imageCrop);
}
im.ReleaseGdPictureImage(imageNr);
}
}
pdf.Dispose();
return(JsonConvert.SerializeObject(res));
}