VAR/VAR.PdfTools
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Move page rendering code to PdfPageRenderer.

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This commit is contained in:
Valeriano A.R.
2019-10-27 08:58:34 +01:00
parent beb3b931ea
commit da8b512c1b
4 changed files with 160 additions and 131 deletions
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134
VAR.PdfTools.Workbench/FrmPdfInfo.cs
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@@ -98,7 +98,7 @@ namespace VAR.PdfTools.Workbench
{
var fontNames = textElement.Childs.Select(c => c.Font == null ? "#NULL#" : c.Font.Name);
StringBuilder sbFontName = new StringBuilder();
foreach(string fontNameAux in fontNames)
foreach (string fontNameAux in fontNames)
{
if (sbFontName.Length > 0) { sbFontName.Append(";"); }
sbFontName.Append(fontNameAux);
@@ -257,8 +257,6 @@ namespace VAR.PdfTools.Workbench
return;
}
int MaxSize = 10000;
PdfDocument doc = PdfDocument.Load(txtPdfPath.Text);
string baseDocumentPath = Path.GetDirectoryName(txtPdfPath.Text);
string baseDocumentFilename = Path.GetFileNameWithoutExtension(txtPdfPath.Text);
@@ -270,136 +268,18 @@ namespace VAR.PdfTools.Workbench
int pageNumber = 1;
foreach (PdfDocumentPage page in doc.Pages)
{
double pageXMin = double.MaxValue;
double pageYMin = double.MaxValue;
double pageXMax = double.MinValue;
double pageYMax = double.MinValue;
PdfPageRenderer pdfPageRenderer = new PdfPageRenderer(page);
Bitmap bmp = pdfPageRenderer.Render();
// Preprocess page to get max size
PdfTextExtractor extractor = new PdfTextExtractor(page);
foreach (PdfTextElement textElement in extractor.Elements)
{
double textElementXMin = textElement.GetX();
double textElementYMax = textElement.GetY();
double textElementXMax = textElementXMin + textElement.VisibleWidth;
double textElementYMin = textElementYMax - textElement.VisibleHeight;
lines.Add(string.Format("Page {0:0000} TextElements : {1}", pageNumber, pdfPageRenderer.Extractor.Elements.Count));
if (textElementXMax > pageXMax) { pageXMax = textElementXMax; }
if (textElementYMax > pageYMax) { pageYMax = textElementYMax; }
if (textElementXMin < pageXMin) { pageXMin = textElementXMin; }
if (textElementYMin < pageYMin) { pageYMin = textElementYMin; }
}
lines.Add(string.Format("Page {0:0000} TextElements : {1}", pageNumber, extractor.Elements.Count));
// Prepare page image
int pageWidth = (int)Math.Ceiling(pageXMax - pageXMin);
int pageHeight = (int)Math.Ceiling(pageYMax - pageYMin);
int Scale = 10;
while ((pageWidth * Scale) > MaxSize) { Scale--; }
while ((pageHeight * Scale) > MaxSize) { Scale--; }
if (Scale <= 0) { Scale = 1; }
using (Bitmap bmp = new Bitmap(pageWidth * Scale, pageHeight * Scale, PixelFormat.Format32bppArgb))
using (Graphics gc = Graphics.FromImage(bmp))
using (Pen penTextElem = new Pen(Color.Blue))
{
gc.Clear(Color.White);
// Draw text elements
foreach (PdfTextElement textElement in extractor.Elements)
{
DrawTextElement(textElement, gc, penTextElem, Scale, pageHeight, pageXMin, pageYMin);
}
// Save image to disk
string fileName = Path.Combine(baseDocumentPath, string.Format("{0}_{1:0000}.png", baseDocumentFilename, pageNumber));
bmp.Save(fileName, ImageFormat.Png);
}
// Save image to disk
string fileName = Path.Combine(baseDocumentPath, string.Format("{0}_{1:0000}.png", baseDocumentFilename, pageNumber));
bmp.Save(fileName, ImageFormat.Png);
pageNumber++;
}
txtOutput.Lines = lines.ToArray();
}
private static void DrawTextElement(PdfTextElement textElement, Graphics gc, Pen penTextElem, int Scale, int pageHeight, double pageXMin, double pageYMin)
{
double textElementX = textElement.GetX() - pageXMin;
double textElementY = textElement.GetY() - pageYMin;
double textElementWidth = textElement.VisibleWidth;
double textElementHeight = textElement.VisibleHeight;
string textElementText = textElement.VisibleText;
string textElementFontName = (textElement.Font == null ? string.Empty : textElement.Font.Name);
if (textElementHeight < 0.0001) { return; }
double textElementPageX = textElementX;
double textElementPageY = pageHeight - textElementY;
DrawRoundedRectangle(gc, penTextElem,
(int)(textElementPageX * Scale),
(int)(textElementPageY * Scale),
(int)(textElementWidth * Scale),
(int)(textElementHeight * Scale),
5);
using (Font font = new Font("Arial", (int)(textElementHeight * Scale), GraphicsUnit.Pixel))
{
foreach (PdfCharElement c in textElement.Characters)
{
gc.DrawString(c.Char,
font,
Brushes.Black,
(int)((textElementPageX + c.Displacement) * Scale),
(int)(textElementPageY * Scale));
gc.FillRectangle(Brushes.Red,
(int)((textElementPageX + c.Displacement) * Scale),
(int)(textElementPageY * Scale),
2, 2);
gc.FillRectangle(Brushes.Green,
(int)((textElementPageX + c.Displacement + c.Width) * Scale),
(int)(textElementPageY * Scale),
2, 2);
}
}
}
public static GraphicsPath RoundedRect(int x, int y, int width, int height, int radius)
{
int diameter = radius * 2;
Size size = new Size(diameter, diameter);
Rectangle arc = new Rectangle(x, y, diameter, diameter);
GraphicsPath path = new GraphicsPath();
// top left arc
path.AddArc(arc, 180, 90);
// top right arc
arc.X = (x + width) - diameter;
path.AddArc(arc, 270, 90);
// bottom right arc
arc.Y = (y + height) - diameter;
path.AddArc(arc, 0, 90);
// bottom left arc
arc.X = x;
path.AddArc(arc, 90, 90);
path.CloseFigure();
return path;
}
public static void DrawRoundedRectangle(Graphics graphics, Pen pen, int x, int y, int width, int height, int cornerRadius)
{
if (graphics == null)
throw new ArgumentNullException("graphics");
if (pen == null)
throw new ArgumentNullException("pen");
using (GraphicsPath path = RoundedRect(x, y, width, height, cornerRadius))
{
graphics.DrawPath(pen, path);
}
}
}
}

3
VAR.PdfTools/PdfDocumentPage.cs
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@@ -69,7 +69,8 @@ namespace VAR.PdfTools
{
PdfParser parser = new PdfParser(_content);
_contentActions = parser.ParseContent();
}else
}
else
{
_contentActions = new List<PdfContentAction>();
}

146
VAR.PdfTools/PdfPageRenderer.cs Normal file
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@@ -0,0 +1,146 @@
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
namespace VAR.PdfTools
{
public class PdfPageRenderer
{
private PdfDocumentPage _page;
private PdfTextExtractor _pdfTextExtractor;
private const int MaxSize = 10000;
public PdfTextExtractor Extractor { get { return _pdfTextExtractor; } }
public PdfPageRenderer(PdfDocumentPage page)
{
_page = page;
_pdfTextExtractor = new PdfTextExtractor(_page);
}
public Bitmap Render()
{
double pageXMin = double.MaxValue;
double pageYMin = double.MaxValue;
double pageXMax = double.MinValue;
double pageYMax = double.MinValue;
// Preprocess page to get max size
foreach (PdfTextElement textElement in _pdfTextExtractor.Elements)
{
double textElementXMin = textElement.GetX();
double textElementYMax = textElement.GetY();
double textElementXMax = textElementXMin + textElement.VisibleWidth;
double textElementYMin = textElementYMax - textElement.VisibleHeight;
if (textElementXMax > pageXMax) { pageXMax = textElementXMax; }
if (textElementYMax > pageYMax) { pageYMax = textElementYMax; }
if (textElementXMin < pageXMin) { pageXMin = textElementXMin; }
if (textElementYMin < pageYMin) { pageYMin = textElementYMin; }
}
// Prepare page image
int pageWidth = (int)Math.Ceiling(pageXMax - pageXMin);
int pageHeight = (int)Math.Ceiling(pageYMax - pageYMin);
int Scale = 10;
while ((pageWidth * Scale) > MaxSize) { Scale--; }
while ((pageHeight * Scale) > MaxSize) { Scale--; }
if (Scale <= 0) { Scale = 1; }
Bitmap bmp = new Bitmap(pageWidth * Scale, pageHeight * Scale, PixelFormat.Format32bppArgb);
using (Graphics gc = Graphics.FromImage(bmp))
using (Pen penTextElem = new Pen(Color.Blue))
{
gc.Clear(Color.White);
// Draw text elements
foreach (PdfTextElement textElement in _pdfTextExtractor.Elements)
{
DrawTextElement(textElement, gc, penTextElem, Scale, pageHeight, pageXMin, pageYMin);
}
}
return bmp;
}
private static void DrawTextElement(PdfTextElement textElement, Graphics gc, Pen penTextElem, int Scale, int pageHeight, double pageXMin, double pageYMin)
{
double textElementX = textElement.GetX() - pageXMin;
double textElementY = textElement.GetY() - pageYMin;
double textElementWidth = textElement.VisibleWidth;
double textElementHeight = textElement.VisibleHeight;
string textElementText = textElement.VisibleText;
string textElementFontName = (textElement.Font == null ? string.Empty : textElement.Font.Name);
if (textElementHeight < 0.0001) { return; }
double textElementPageX = textElementX;
double textElementPageY = pageHeight - textElementY;
DrawRoundedRectangle(gc, penTextElem,
(int)(textElementPageX * Scale),
(int)(textElementPageY * Scale),
(int)(textElementWidth * Scale),
(int)(textElementHeight * Scale),
5);
using (Font font = new Font("Arial", (int)(textElementHeight * Scale), GraphicsUnit.Pixel))
{
foreach (PdfCharElement c in textElement.Characters)
{
gc.DrawString(c.Char,
font,
Brushes.Black,
(int)((textElementPageX + c.Displacement) * Scale),
(int)(textElementPageY * Scale));
gc.FillRectangle(Brushes.Red,
(int)((textElementPageX + c.Displacement) * Scale),
(int)(textElementPageY * Scale),
2, 2);
gc.FillRectangle(Brushes.Green,
(int)((textElementPageX + c.Displacement + c.Width) * Scale),
(int)(textElementPageY * Scale),
2, 2);
}
}
}
public static GraphicsPath RoundedRect(int x, int y, int width, int height, int radius)
{
int diameter = radius * 2;
Size size = new Size(diameter, diameter);
Rectangle arc = new Rectangle(x, y, diameter, diameter);
GraphicsPath path = new GraphicsPath();
// top left arc
path.AddArc(arc, 180, 90);
// top right arc
arc.X = (x + width) - diameter;
path.AddArc(arc, 270, 90);
// bottom right arc
arc.Y = (y + height) - diameter;
path.AddArc(arc, 0, 90);
// bottom left arc
arc.X = x;
path.AddArc(arc, 90, 90);
path.CloseFigure();
return path;
}
public static void DrawRoundedRectangle(Graphics graphics, Pen pen, int x, int y, int width, int height, int cornerRadius)
{
if (graphics == null)
throw new ArgumentNullException("graphics");
if (pen == null)
throw new ArgumentNullException("pen");
using (GraphicsPath path = RoundedRect(x, y, width, height, cornerRadius))
{
graphics.DrawPath(pen, path);
}
}
}
}

2
VAR.PdfTools/VAR.PdfTools.csproj
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@@ -54,6 +54,7 @@
<ItemGroup>
<Reference Include="System" />
<Reference Include="System.Core" />
<Reference Include="System.Drawing" />
<Reference Include="System.Xml.Linq" />
<Reference Include="System.Data.DataSetExtensions" />
<Reference Include="System.Data" />
@@ -81,6 +82,7 @@
<Compile Include="PdfElements\PdfStream.cs" />
<Compile Include="PdfElements\PdfString.cs" />
<Compile Include="PdfParser.cs" />
<Compile Include="PdfPageRenderer.cs" />
<Compile Include="PdfStandar14FontMetrics.cs" />
<Compile Include="PdfTextExtractor.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />