/// <summary>
/// Get the horizontial bound of a element.
/// </summary>
/// <param name="element"></param>
/// <param name="pageDefaultMatrix"></param>
/// <returns></returns>
public static double[] GetHorBound(this Element element, Matrix2D pageDefaultMatrix)
{
double[] bound = new double[2];
bool leftBreak = false;
var gs = element.GetGState();
var font = gs.GetFont();
string text = element.GetTextString();
var mtx = element.GetCTM() * element.GetTextMatrix();
double font_size = Math.Abs(gs.GetFontSize() * Math.Sqrt(mtx.m_b * mtx.m_b + mtx.m_d * mtx.m_d));
int charIndex = 0;
for (CharIterator itr = element.GetCharIterator(); itr.HasNext(); itr.Next())
{
double x = itr.Current().x;
double y = itr.Current().y;
double w = font.GetWidth(itr.Current().char_code) * 0.001 * font_size;
int charCode = itr.Current().char_code;
char ch = text[charIndex];
mtx.Mult(ref x, ref y);
pageDefaultMatrix.Mult(ref x, ref y);
if (!leftBreak && !ch.IsBlankSpace())
{
leftBreak = true;
bound[0] = x;
}
if (!ch.IsBlankSpace())
{
bound[1] = x + w - bound[0];
}
charIndex++;
}
return(bound);
}
/// <summary>
/// Get the parts of the element ergodiced from pdf page.
/// </summary>
/// <param name="element"></param>
/// <param name="pageDefaultMatrix"></param>
/// <returns></returns>
public static List <DataElementPart> GetElementParts(Element element, Matrix2D pageDefaultMatrix)
{
List <DataElementPart> parts = new List <DataElementPart>();
int index = -1;
var gs = element.GetGState();
var font = gs.GetFont();
string text = element.GetTextString();
var mtx = element.GetCTM() * element.GetTextMatrix();
double font_size = Math.Abs(gs.GetFontSize() * Math.Sqrt(mtx.m_b * mtx.m_b + mtx.m_d * mtx.m_d));
for (CharIterator itr = element.GetCharIterator(); itr.HasNext(); itr.Next())
{
index++;
if (text[index].IsBlankSpace())
{
continue;
}
double x = itr.Current().x;
double y = itr.Current().y;
int charCode = itr.Current().char_code;
double charWidth = font.GetWidth(charCode);
char chars = (char)charCode;
//if (charCode >= 48 && charCode <= 57)//|| chars==',' || chars=='.')
// charWidth = 500;
double w = charWidth * 0.001 * font_size;
double h = font_size;
mtx.Mult(ref x, ref y);
pageDefaultMatrix.Mult(ref x, ref y);
parts.Add(new DataElementPart
{
LeftBound = x, Width = w, Text = text[index].ToString()
});
}
Merge(parts);
return(parts);
}
static public void ProcessText(ElementReader page_reader)
{
// Begin text element
Console.WriteLine("Begin Text Block:");
Element element;
while ((element = page_reader.Next()) != null)
{
switch (element.GetType())
{
case Element.Type.e_text_end:
// Finish the text block
Console.WriteLine("End Text Block.");
return;
case Element.Type.e_text:
{
GState gs = element.GetGState();
ColorSpace cs_fill = gs.GetFillColorSpace();
ColorPt fill = gs.GetFillColor();
ColorPt outc = new ColorPt();
cs_fill.Convert2RGB(fill, outc);
ColorSpace cs_stroke = gs.GetStrokeColorSpace();
ColorPt stroke = gs.GetStrokeColor();
Font font = gs.GetFont();
Console.Write("Font Name: ");
Console.WriteLine(font.GetName());
// font.IsFixedWidth();
// font.IsSerif();
// font.IsSymbolic();
// font.IsItalic();
// ...
// double word_spacing = gs.GetWordSpacing();
// double char_spacing = gs.GetCharSpacing();
// Use element.GetCTM() if you are interested in the CTM
// (current transformation matrix).
if (font.GetType() == Font.Type.e_Type3)
{
//type 3 font, process its data
for (CharIterator itr = element.GetCharIterator(); itr.HasNext(); itr.Next())
{
page_reader.Type3FontBegin(itr.Current());
ProcessElements(page_reader);
page_reader.End();
}
}
else
{
Matrix2D ctm = element.GetCTM();
Matrix2D text_mtx = element.GetTextMatrix();
/*
* Matrix2D mtx = ctm * text_mtx;
* double font_sz_scale_factor = System.Math.Sqrt(mtx.m_b * mtx.m_b + mtx.m_d * mtx.m_d);
* double font_size = gs.GetFontSize();
* Console.Write(" Font Size: {0:f}", font_sz_scale_factor * font_size);
*
* ColorPt font_color = gs.GetFillColor();
* ColorSpace cs = gs.GetFillColorSpace();
*
* ColorPt rgb = new ColorPt();
* cs.Convert2RGB(font_color, rgb);
* Color font_color_rgb = Color.FromArgb(255, (byte)(rgb.get_c(0)*255),
* (byte)(rgb.get_c(1)*255), (byte)(rgb.get_c(2)*255));
*
*
* Console.WriteLine(" Font Color(RGB): red={0:d} green={1:d} blue={2:d}",
* (byte)(rgb.Get(0)*255),
* (byte)(rgb.Get(1)*255),
* (byte)(rgb.Get(2)*255));
*/
double x, y;
int char_code;
for (CharIterator itr = element.GetCharIterator(); itr.HasNext(); itr.Next())
{
Console.Write("Character code: ");
char_code = itr.Current().char_code;
if (char_code >= 32 || char_code <= 127)
{
// Print if in ASCII range...
Console.Write((char)char_code);
}
x = itr.Current().x; // character positioning information
y = itr.Current().y;
// To get the exact character positioning information you need to
// concatenate current text matrix with CTM and then multiply
// relative positioning coordinates with the resulting matrix.
//
Matrix2D mtx2 = ctm * text_mtx;
mtx2.Mult(ref x, ref y);
// Console.WriteLine(" Position: x={0:f} y={1:f}", x, y);
}
}
Console.WriteLine();
break;
}
}
}
}
// prcoess text element
void ProcessTextElement(Element element)
{
double x, y;
var text = element.GetTextString();
if (text.Trim().Length == 0)
{
return;
}
var matrix = element.GetCTM();
matrix.Concat(_pageMatrix.m_a, _pageMatrix.m_b, _pageMatrix.m_c, _pageMatrix.m_d, _pageMatrix.m_h, _pageMatrix.m_v);
matrix *= element.GetTextMatrix();
var gs = element.GetGState();
var font = gs.GetFont();
double font_size = Math.Abs(gs.GetFontSize() * Math.Sqrt(matrix.m_b * matrix.m_b + matrix.m_d * matrix.m_d));// font_size * font_sz_scale_factor;
// remove watermark
if (font_size > 32 && gs.GetTextRenderMode() == GState.TextRenderingMode.e_stroke_text)
{
return;
}
int index = -1;
var chs = new PdfChar[text.Length];
for (CharIterator itr = element.GetCharIterator(); itr.HasNext(); itr.Next())
{
index++;
x = itr.Current().x;
y = itr.Current().y;
matrix.Mult(ref x, ref y);
var ch = text[index];
if (ch == 65533)
{
//in some pdf files,we can't find the right unicode for some characters by using pdftron,
//so we record a pdf charcode with a right unicode value,and then computing the unicode for those bad characters.
if (_charCode > 0)
{
ch = (char)(_charUnicode + itr.Current().char_code - _charCode);
}
}
else if (ch >= 0x4e00)
{
_charUnicode = ch;
_charCode = itr.Current().char_code;
}
chs[index] = new PdfChar(ch, new System.Windows.Rect(x, y, font.GetWidth(itr.Current().char_code) * 0.001 * font_size, font_size));
}
var pchar = chs[0];
var dis = _pageHeight - pchar.Top;
index = (int)dis >> 2;
var textLine = _textLines[index];
if (textLine == null)
{
_textLines[index] = textLine = new PdfLineOfText();
}
textLine.AddPdfChars(chs);
}
