VAR/VAR.PdfTools
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PdfPageRenderer: Refactor using Rect.

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Valeriano A.R.
2019-10-27 13:12:11 +01:00
parent 53d07db9c0
commit 386b38bd21
1 changed files with 14 additions and 27 deletions
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41
VAR.PdfTools/PdfPageRenderer.cs
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@@ -2,6 +2,7 @@
using System.Drawing; using System.Drawing;
using System.Drawing.Drawing2D; using System.Drawing.Drawing2D;
using System.Drawing.Imaging; using System.Drawing.Imaging;
using VAR.PdfTools.Maths;
namespace VAR.PdfTools namespace VAR.PdfTools
{ {
@@ -9,9 +10,7 @@ namespace VAR.PdfTools
{ {
private PdfDocumentPage _page; private PdfDocumentPage _page;
private PdfTextExtractor _pdfTextExtractor; private PdfTextExtractor _pdfTextExtractor;
private const int MaxSize = 10000;
public PdfTextExtractor Extractor { get { return _pdfTextExtractor; } } public PdfTextExtractor Extractor { get { return _pdfTextExtractor; } }
public PdfPageRenderer(PdfDocumentPage page) public PdfPageRenderer(PdfDocumentPage page)
@@ -24,36 +23,24 @@ namespace VAR.PdfTools
{ {
if (_pdfTextExtractor.Elements.Count == 0) if (_pdfTextExtractor.Elements.Count == 0)
{ {
// Nothing to render
Bitmap emptyBmp = new Bitmap(100, 200, PixelFormat.Format32bppArgb); Bitmap emptyBmp = new Bitmap(100, 200, PixelFormat.Format32bppArgb);
using (Graphics gc = Graphics.FromImage(emptyBmp))
gc.Clear(Color.White);
return emptyBmp; return emptyBmp;
} }
double pageXMin = double.MaxValue; // Calculate page size and scale
double pageYMin = double.MaxValue; Rect pageRect = _pdfTextExtractor.GetRect();
double pageXMax = double.MinValue; int pageWidth = (int)Math.Ceiling(pageRect.XMax - pageRect.XMin);
double pageYMax = double.MinValue; int pageHeight = (int)Math.Ceiling(pageRect.YMax - pageRect.YMin);
// 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; int Scale = 10;
int MaxSize = 10000;
while ((pageWidth * Scale) > MaxSize) { Scale--; } while ((pageWidth * Scale) > MaxSize) { Scale--; }
while ((pageHeight * Scale) > MaxSize) { Scale--; } while ((pageHeight * Scale) > MaxSize && Scale > 1) { Scale--; }
if (Scale <= 0) { Scale = 1; } if (Scale <= 0) { Scale = 1; }
// Draw page image
Bitmap bmp = new Bitmap(pageWidth * Scale, pageHeight * Scale, PixelFormat.Format32bppArgb); Bitmap bmp = new Bitmap(pageWidth * Scale, pageHeight * Scale, PixelFormat.Format32bppArgb);
using (Graphics gc = Graphics.FromImage(bmp)) using (Graphics gc = Graphics.FromImage(bmp))
using (Pen penTextElem = new Pen(Color.Blue)) using (Pen penTextElem = new Pen(Color.Blue))
@@ -64,7 +51,7 @@ namespace VAR.PdfTools
// Draw text elements // Draw text elements
foreach (PdfTextElement textElement in _pdfTextExtractor.Elements) foreach (PdfTextElement textElement in _pdfTextExtractor.Elements)
{ {
DrawTextElement(textElement, gc, penTextElem, penCharElem, Scale, pageHeight, pageXMin, pageYMin, Brushes.Black); DrawTextElement(textElement, gc, penTextElem, penCharElem, Scale, pageHeight, pageRect.XMin, pageRect.YMin, Brushes.Black);
} }
} }
return bmp; return bmp;