Contains information of a single PDF object.
[SerializableAttribute()]
public struct PDFObject
<SerializableAttribute()>
Public Structure PDFObject
Inherits System.ValueType
public class PDFObject
[SerializableAttribute()]
public value class PDFObject : public System.ValueType
The PDFObject structure contains information of a single PDF text item (character), rectangle or image. To read objects from a PDF file, use the PDFDocument.ParsePages method. After this method returns and depending on the value of PDFParsePagesOptions parameter passed to the method, the PDFDocumentPage.Objects, PDFDocumentPage.Annotations, PDFDocumentPage.FormFields, PDFDocumentPage.Signatures and PDFDocumentPage.Hyperlinks collections will be populated with the items of the PDF page.
This example will read all the objects from a PDF page and then re-draw these objects on an image that closely resembles the original PDF page before saving it to disk. You can use this example as a base for drawing a PDF page as a "vector" drawing.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Pdf;
using Leadtools.WinForms;
using Leadtools.Drawing;
public void PDFObjectExample()
{
string pdfFileName = Path.Combine(LEAD_VARS.ImagesDir, @"Leadtools.pdf");
string pngFileName = Path.Combine(LEAD_VARS.ImagesDir, @"LEAD_png.png");
// Create a PDF document for file at 200 DPI
using (PDFDocument document = new PDFDocument(pdfFileName))
{
document.Resolution = 200;
// Parse the objects of the first page
document.ParseDocumentStructure(PDFParseDocumentStructureOptions.Fonts);
document.ParsePages(PDFParsePagesOptions.Fonts | PDFParsePagesOptions.Objects, 1, 1);
// Get the page
PDFDocumentPage page = document.Pages[0];
// Get the image of the page so we can use it to get the source image objects
using (RasterImage pageImage = document.GetPageImage(null, page.PageNumber))
{
// Create the bitmap to draw the objects to
using (Bitmap btmp = new Bitmap(page.WidthPixels, page.HeightPixels))
{
btmp.SetResolution(document.Resolution, document.Resolution);
using (Graphics g = Graphics.FromImage(btmp))
{
g.Clear(Color.White);
// Render the objects
// Text is line at a time
LeadRect textRect = LeadRect.Empty;
double textFontHeight = 0;
StringBuilder textLine = new StringBuilder();
foreach (PDFObject obj in page.Objects)
{
switch (obj.ObjectType)
{
case PDFObjectType.Image:
RenderImage(g, pageImage, page, obj);
break;
case PDFObjectType.Text:
// Add the text code and rects together
textLine.Append(obj.Code);
PDFRect rc = page.ConvertRect(PDFCoordinateType.Pdf, PDFCoordinateType.Pixel, obj.Bounds);
LeadRect objRect = LeadRect.FromLTRB((int)rc.Left, (int)rc.Top, (int)rc.Right, (int)rc.Bottom);
if (textRect.IsEmpty)
{
textRect = objRect;
}
else
{
textRect = LeadRect.Union(textRect, objRect);
}
textFontHeight = Math.Max(textFontHeight, obj.TextProperties.FontHeight);
// If this is the last object in a line, render it
if (obj.TextProperties.IsEndOfLine)
{
RenderText(g, document, page, textLine.ToString(), textRect, obj.TextProperties, textFontHeight);
textLine = new StringBuilder();
textRect = LeadRect.Empty;
}
break;
}
}
}
btmp.Save(pngFileName, System.Drawing.Imaging.ImageFormat.Png);
}
}
}
}
private static void RenderImage(Graphics g, RasterImage pageImage, PDFDocumentPage page, PDFObject obj)
{
LeadRect destRect = new LeadRect(0, 0, page.WidthPixels, page.HeightPixels);
// Get the object coordinates in pixels
PDFRect rc = page.ConvertRect(PDFCoordinateType.Pdf, PDFCoordinateType.Pixel, obj.Bounds);
LeadRect destClipRect = LeadRect.FromLTRB((int)rc.Left, (int)rc.Top, (int)rc.Right, (int)rc.Bottom);
// Draw from the page image to the destination graphics
RasterPaintProperties props = RasterPaintProperties.Default;
props.PaintEngine = RasterPaintEngine.GdiPlus;
RasterImagePainter.Paint(
pageImage,
g,
LeadRect.Empty,
LeadRect.Empty,
destRect,
destClipRect,
props);
}
private static void RenderText(Graphics g, PDFDocument document, PDFDocumentPage page, string text, LeadRect textRect, PDFTextProperties textProperties, double textFontHeight)
{
// Create the font
// Find it in the fonts collection
string faceName = null;
if (document.Fonts != null && textProperties.FontIndex < document.Fonts.Count)
{
PDFFont font = document.Fonts[textProperties.FontIndex];
faceName = font.FaceName;
}
if (string.IsNullOrEmpty(faceName))
{
// Could be an embedded font, use Arial
faceName = "Arial";
}
using (Font f = new Font(faceName, (float)textFontHeight * 72 / g.DpiY))
{
using (Brush brush = new SolidBrush(RasterColorConverter.ToColor(textProperties.Color)))
{
Rectangle rect = new Rectangle(textRect.X, textRect.Y, textRect.Width, textRect.Height);
using (StringFormat sf = new StringFormat())
{
sf.Alignment = StringAlignment.Center;
sf.LineAlignment = StringAlignment.Center;
sf.FormatFlags |= StringFormatFlags.NoClip | StringFormatFlags.NoWrap;
g.DrawString(text, f, brush, rect, sf);
}
}
}
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Pdf
Imports Leadtools.WinForms
Imports Leadtools.Drawing
Public Sub PDFObjectExample()
Dim pdfFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Leadtools.pdf")
Dim pngFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "LEAD_png.png")
' Create a PDF document for file at 200 DPI
Using document As PDFDocument = New PDFDocument(pdfFileName)
document.Resolution = 200
' Parse the objects of the first page
document.ParseDocumentStructure(PDFParseDocumentStructureOptions.Fonts)
document.ParsePages(PDFParsePagesOptions.Fonts Or PDFParsePagesOptions.Objects, 1, 1)
' Get the page
Dim page As PDFDocumentPage = document.Pages(0)
' Get the image of the page so we can use it to get the source image objects
Using pageImage As RasterImage = document.GetPageImage(Nothing, page.PageNumber)
' Create the bitmap to draw the objects to
Using btmp As Bitmap = New Bitmap(page.WidthPixels, page.HeightPixels)
btmp.SetResolution(document.Resolution, document.Resolution)
Using g As Graphics = Graphics.FromImage(btmp)
g.Clear(Color.White)
' Render the objects
' Text is line at a time
Dim textRect As LeadRect = LeadRect.Empty
Dim textFontHeight As Double = 0
Dim textLine As StringBuilder = New StringBuilder()
For Each obj As PDFObject In page.Objects
Select Case obj.ObjectType
Case PDFObjectType.Image
RenderImage(g, pageImage, page, obj)
Case PDFObjectType.Text
' Add the text code and rects together
textLine.Append(obj.Code)
Dim rc As PDFRect = page.ConvertRect(PDFCoordinateType.Pdf, PDFCoordinateType.Pixel, obj.Bounds)
Dim objRect As LeadRect = LeadRect.FromLTRB(CInt(rc.Left), CInt(rc.Top), CInt(rc.Right), CInt(rc.Bottom))
If textRect.IsEmpty Then
textRect = objRect
Else
textRect = LeadRect.Union(textRect, objRect)
End If
textFontHeight = Math.Max(textFontHeight, obj.TextProperties.FontHeight)
' If this is the last object in a line, render it
If obj.TextProperties.IsEndOfLine Then
RenderText(g, document, page, textLine.ToString(), textRect, obj.TextProperties, textFontHeight)
textLine = New StringBuilder()
textRect = LeadRect.Empty
End If
End Select
Next obj
End Using
btmp.Save(pngFileName, System.Drawing.Imaging.ImageFormat.Png)
End Using
End Using
End Using
End Sub
Private Shared Sub RenderImage(ByVal g As Graphics, ByVal pageImage As RasterImage, ByVal page As PDFDocumentPage, ByVal obj As PDFObject)
Dim destRect As LeadRect = New LeadRect(0, 0, page.WidthPixels, page.HeightPixels)
' Get the object coordinates in pixels
Dim rc As PDFRect = page.ConvertRect(PDFCoordinateType.Pdf, PDFCoordinateType.Pixel, obj.Bounds)
Dim destClipRect As LeadRect = LeadRect.FromLTRB(CInt(rc.Left), CInt(rc.Top), CInt(rc.Right), CInt(rc.Bottom))
' Draw from the page image to the destination graphics
Dim props As RasterPaintProperties = RasterPaintProperties.Default
props.PaintEngine = RasterPaintEngine.GdiPlus
RasterImagePainter.Paint(pageImage, g, LeadRect.Empty, LeadRect.Empty, destRect, destClipRect, props)
End Sub
Private Shared Sub RenderText(ByVal g As Graphics, ByVal document As PDFDocument, ByVal page As PDFDocumentPage, ByVal text As String, ByVal textRect As LeadRect, ByVal textProperties As PDFTextProperties, ByVal textFontHeight As Double)
' Create the font
' Find it in the fonts collection
Dim faceName As String = "Arial"
If Not IsNothing(document.Fonts) AndAlso textProperties.FontIndex < document.Fonts.Count Then
Dim font As PDFFont = document.Fonts(textProperties.FontIndex)
faceName = font.FaceName
End If
If String.IsNullOrEmpty(faceName) Then
' Could be an embedded font, use Arial
faceName = "Arial"
End If
Using f As Font = New Font(faceName, CSng(textFontHeight) * 72 / g.DpiY)
Using brush As Brush = New SolidBrush(RasterColorConverter.ToColor(textProperties.Color))
Dim rect As Rectangle = New Rectangle(textRect.X, textRect.Y, textRect.Width, textRect.Height)
Using sf As StringFormat = New StringFormat()
sf.Alignment = StringAlignment.Center
sf.LineAlignment = StringAlignment.Center
sf.FormatFlags = sf.FormatFlags Or StringFormatFlags.NoClip Or StringFormatFlags.NoWrap
g.DrawString(text, f, brush, rect, sf)
End Using
End Using
End Using
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
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