private static List <Word> GetSnappedWords(DocPageInfo page_info, Point mouse_up_point, Point mouse_down_point)
{
WPFDoEvents.AssertThisCodeIs_NOT_RunningInTheUIThread();
double left = Math.Min(mouse_up_point.X, mouse_down_point.X) / page_info.ActualWidth;
double top = Math.Min(mouse_up_point.Y, mouse_down_point.Y) / page_info.ActualHeight;
double width = Math.Abs(mouse_up_point.X - mouse_down_point.X) / page_info.ActualWidth;
double height = Math.Abs(mouse_up_point.Y - mouse_down_point.Y) / page_info.ActualHeight;
List <Word> words_in_selection = new List <Word>();
WordList word_list = page_info.pdf_document.GetOCRText(page_info.page);
if (null != word_list)
{
foreach (var word in word_list)
{
if (word.IsContained(left, top, width, height))
{
words_in_selection.Add(word);
}
}
}
return(words_in_selection);
}
private static BitmapSource GetSnappedImage(DocPageInfo page_info, Point mouse_up_point, Point mouse_down_point)
{
WPFDoEvents.AssertThisCodeIs_NOT_RunningInTheUIThread();
BitmapSource cropped_image_page = null;
using (MemoryStream ms = new MemoryStream(page_info.pdf_document.GetPageByDPIAsImage(page_info.page, 150)))
{
PngBitmapDecoder decoder = new PngBitmapDecoder(ms, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad);
BitmapSource image_page = decoder.Frames[0];
if (null != image_page)
{
double left = Math.Min(mouse_up_point.X, mouse_down_point.X) * image_page.PixelWidth / page_info.ActualWidth;
double top = Math.Min(mouse_up_point.Y, mouse_down_point.Y) * image_page.PixelHeight / page_info.ActualHeight;
double width = Math.Abs(mouse_up_point.X - mouse_down_point.X) * image_page.PixelWidth / page_info.ActualWidth;
double height = Math.Abs(mouse_up_point.Y - mouse_down_point.Y) * image_page.PixelHeight / page_info.ActualHeight;
left = Math.Max(left, 0);
top = Math.Max(top, 0);
width = Math.Min(width, image_page.PixelWidth - left);
height = Math.Min(height, image_page.PixelHeight - top);
if (0 < width && 0 < height)
{
var cropped = new CroppedBitmap(image_page, new Int32Rect((int)left, (int)top, (int)width, (int)height));
// UPDATE HERE: CroppedBitmap to BitmapImage
// cropped_image_page = GetJpgImage(cropped.Source);
// or
//cropped_image_page = GetPngImage(cropped.Source);
using (MemoryStream mStream = new MemoryStream())
{
PngBitmapEncoder jEncoder = new PngBitmapEncoder();
jEncoder.Frames.Add(BitmapFrame.Create(cropped)); // the croppedBitmap is a CroppedBitmap object
// jEncoder.QualityLevel = 75;
jEncoder.Save(mStream);
cropped_image_page = BitmapImageTools.LoadFromStream(mStream);
// I can also get array of bytes that represent the cropped image by call this method : mStream.GetBuffer()
//cropped_image_page = BitmapImageTools.CropImageRegion(image_page, left, top, width, height);
}
}
}
return(cropped_image_page);
}
}
private void drag_area_tracker_OnDragComplete(bool button_left_pressed, bool button_right_pressed, Point mouse_down_point, Point mouse_up_point)
{
FeatureTrackingManager.Instance.UseFeature(Features.Document_Camera);
double width_page = Math.Abs(mouse_up_point.X - mouse_down_point.X);
double height_page = Math.Abs(mouse_up_point.Y - mouse_down_point.Y);
if (3 <= width_page && 3 <= height_page)
{
DocPageInfo page_info = new DocPageInfo {
pdf_document = @pdf_document,
page = @page,
ActualHeight = @ActualHeight,
ActualWidth = @ActualWidth
};
SafeThreadPool.QueueUserWorkItem(o =>
{
// GetSnappedImage() invokes the background renderer, hence run it in a background thread itself:
BitmapSource image = GetSnappedImage(page_info, mouse_up_point, mouse_down_point);
List <Word> words = GetSnappedWords(page_info, mouse_up_point, mouse_down_point);
string raw_text = SelectedWordsToFormattedTextConvertor.ConvertToParagraph(words);
string tabled_text = SelectedWordsToFormattedTextConvertor.ConvertToTable(words);
WPFDoEvents.InvokeAsyncInUIThread(() =>
{
CameraActionChooserDialog cacd = new CameraActionChooserDialog();
cacd.SetLovelyDetails(image, raw_text, tabled_text);
cacd.ShowDialog();
});
});
}
else
{
Logging.Info("Region too small to screen grab");
}
}
