private void _getTextToolStripMenuItem_Click(object sender, EventArgs e)
{
var document = _viewer.CurrentDocument;
if (document != null)
{
var documentText = DocumentText.FromSvgDocument(document);
if (documentText != null)
{
documentText.BuildWords();
_viewer.DocumentList[_viewer.CurrentPageIndex].DocumentText = documentText;
_viewer.DocumentList[_viewer.CurrentPageIndex].ShowText = _selectTextToolStripMenuItem.Checked;
_viewer.Invalidate();
UpdateControls();
}
}
}
public SvgDocumentInformation(SvgDocument document)
{
_document = document;
_documentText = null;
_showText = false;
}
public static DocumentText FromSvgDocument(SvgDocument document)
{
// Out list of charcaters
var characters = new List <DocumentCharacter>();
// To strip whitespaces
var hasWhitespaces = false;
var prevCharacter = new DocumentCharacter();
// Callback
SvgSortElementsCallback sortCallback = (callabackDocument, info, userData) =>
{
// Is it text?
var textData = info.TextData;
if (textData != null)
{
// yes, does it have any characters?
var length = textData.Text.Length;
for (var i = 0; i < length; i++)
{
// Yes, convert to DocumentCharacter and add them to the list
var flags = textData.CharacterFlags[i];
var positions = DocumentCharacterPositions.None;
if ((flags & SvgTextCharacterFlags.EndOfWord) == SvgTextCharacterFlags.EndOfWord)
{
positions |= DocumentCharacterPositions.EndOfWord;
}
if ((flags & SvgTextCharacterFlags.EndOfLine) == SvgTextCharacterFlags.EndOfLine)
{
positions |= DocumentCharacterPositions.EndOfLine;
}
var character = new DocumentCharacter
{
Code = textData.Text[i],
Bounds = textData.Bounds[i],
Positions = positions,
Direction = textData.Directions[i]
};
// If the character duplicated, then remove the old one
if (prevCharacter.Bounds == character.Bounds &&
prevCharacter.Code == character.Code &&
prevCharacter.Direction == character.Direction)
{
characters.Remove(prevCharacter);
}
characters.Add(character);
if (!hasWhitespaces && Char.IsWhiteSpace(character.Code))
{
hasWhitespaces = true;
}
prevCharacter = character;
}
}
return(true);
};
// Accept text elements only.
SvgFilterElementsCallback filterElementsCallback = (svgDocument, nodeHandle, userData) =>
{
// Accept text elements only.
if (nodeHandle.ElementType != SvgElementType.Text)
{
return(false);
}
return(true);
};
// Setup options and sort
var options = new SvgSortOptions {
ExtractText = SvgExtractText.Character, SortFlags = SvgSortFlags.Default
};
document.SetFilterElementsCallback(filterElementsCallback, null);
document.SortElements(options, sortCallback, null);
document.SetFilterElementsCallback(null, null);
// Characters is set, before using it, strip the whitespaces
if (hasWhitespaces)
{
var temp = new List <DocumentCharacter>();
var count = characters.Count;
var positions = DocumentCharacterPositions.None;
var newIndex = -1;
for (var index = 0; index < count; index++)
{
var character = characters[index];
// If this character is a whitespace, dont add it, just steal its position and add it to the previous character
if (Char.IsWhiteSpace(character.Code))
{
positions |= character.Positions;
}
else
{
// If have stolen flags from dropping white space characters, add them to the last non-white space character
if (positions != DocumentCharacterPositions.None)
{
if (newIndex != -1)
{
var tempCharacter = temp[newIndex];
tempCharacter.Positions |= positions;
temp[newIndex] = tempCharacter;
}
positions = DocumentCharacterPositions.None;
}
// Add it
temp.Add(character);
newIndex++;
}
}
characters = temp;
}
var result = new DocumentText(characters);
return(result);
}
