VAR/VAR.PdfTools
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PdfPageRenderer: Better rendering of character size.

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This commit is contained in:
Valeriano A.R.
2019-10-27 09:59:46 +01:00
parent 203f30e55c
commit 7badc8e4b1
1 changed files with 29 additions and 17 deletions
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46
VAR.PdfTools/PdfPageRenderer.cs
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@@ -22,6 +22,12 @@ namespace VAR.PdfTools
public Bitmap Render() public Bitmap Render()
{ {
if (_pdfTextExtractor.Elements.Count == 0)
{
Bitmap emptyBmp = new Bitmap(100, 200, PixelFormat.Format32bppArgb);
return emptyBmp;
}
double pageXMin = double.MaxValue; double pageXMin = double.MaxValue;
double pageYMin = double.MaxValue; double pageYMin = double.MaxValue;
double pageXMax = double.MinValue; double pageXMax = double.MinValue;
@@ -40,6 +46,7 @@ namespace VAR.PdfTools
if (textElementXMin < pageXMin) { pageXMin = textElementXMin; } if (textElementXMin < pageXMin) { pageXMin = textElementXMin; }
if (textElementYMin < pageYMin) { pageYMin = textElementYMin; } if (textElementYMin < pageYMin) { pageYMin = textElementYMin; }
} }
// Prepare page image // Prepare page image
int pageWidth = (int)Math.Ceiling(pageXMax - pageXMin); int pageWidth = (int)Math.Ceiling(pageXMax - pageXMin);
int pageHeight = (int)Math.Ceiling(pageYMax - pageYMin); int pageHeight = (int)Math.Ceiling(pageYMax - pageYMin);
@@ -50,19 +57,20 @@ namespace VAR.PdfTools
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))
using (Pen penCharElem = new Pen(Color.Navy))
{ {
gc.Clear(Color.White); gc.Clear(Color.White);
// Draw text elements // Draw text elements
foreach (PdfTextElement textElement in _pdfTextExtractor.Elements) foreach (PdfTextElement textElement in _pdfTextExtractor.Elements)
{ {
DrawTextElement(textElement, gc, penTextElem, Scale, pageHeight, pageXMin, pageYMin); DrawTextElement(textElement, gc, penTextElem, penCharElem, Scale, pageHeight, pageXMin, pageYMin, Brushes.Black);
} }
} }
return bmp; return bmp;
} }
private static void DrawTextElement(PdfTextElement textElement, Graphics gc, Pen penTextElem, int Scale, int pageHeight, double pageXMin, double pageYMin) private static void DrawTextElement(PdfTextElement textElement, Graphics gc, Pen penTextElem, Pen penCharElem, int Scale, int pageHeight, double pageXMin, double pageYMin, Brush brushText)
{ {
double textElementX = textElement.GetX() - pageXMin; double textElementX = textElement.GetX() - pageXMin;
double textElementY = textElement.GetY() - pageYMin; double textElementY = textElement.GetY() - pageYMin;
@@ -76,12 +84,15 @@ namespace VAR.PdfTools
double textElementPageX = textElementX; double textElementPageX = textElementX;
double textElementPageY = pageHeight - textElementY; double textElementPageY = pageHeight - textElementY;
DrawRoundedRectangle(gc, penTextElem, if (penTextElem != null)
(int)(textElementPageX * Scale), {
(int)(textElementPageY * Scale), DrawRoundedRectangle(gc, penTextElem,
(int)(textElementWidth * Scale), (int)(textElementPageX * Scale),
(int)(textElementHeight * Scale), (int)(textElementPageY * Scale),
5); (int)(textElementWidth * Scale),
(int)(textElementHeight * Scale),
5);
}
using (Font font = new Font("Arial", (int)(textElementHeight * Scale), GraphicsUnit.Pixel)) using (Font font = new Font("Arial", (int)(textElementHeight * Scale), GraphicsUnit.Pixel))
{ {
@@ -89,17 +100,18 @@ namespace VAR.PdfTools
{ {
gc.DrawString(c.Char, gc.DrawString(c.Char,
font, font,
Brushes.Black, brushText,
(int)((textElementPageX + c.Displacement) * Scale), (int)((textElementPageX + c.Displacement) * Scale),
(int)(textElementPageY * Scale)); (int)(textElementPageY * Scale));
gc.FillRectangle(Brushes.Red, if (penCharElem != null)
(int)((textElementPageX + c.Displacement) * Scale), {
(int)(textElementPageY * Scale), DrawRoundedRectangle(gc, penCharElem,
2, 2); (int)((textElementPageX + c.Displacement) * Scale),
gc.FillRectangle(Brushes.Green, (int)(textElementPageY * Scale),
(int)((textElementPageX + c.Displacement + c.Width) * Scale), (int)(c.Width * Scale),
(int)(textElementPageY * Scale), (int)(textElementHeight * Scale),
2, 2); 5);
}
} }
} }
} }