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Fix font size calculations for OCR

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This commit is contained in:
Ben Olden-Cooligan 2015-06-30 17:03:17 -04:00
parent 69401e1773
commit c57c329084
1 changed files with 18 additions and 4 deletions
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22
NAPS2.Core/ImportExport/Pdf/PdfSharpExporter.cs
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@ -80,10 +80,9 @@ namespace NAPS2.ImportExport.Pdf
var tf = new XTextFormatter(gfx);
foreach (var element in ocrResult.Elements)
{
var b = element.Bounds;
var adjustedBounds = new RectangleF(b.X * hAdjust, b.Y * vAdjust, b.Width * hAdjust, b.Height * vAdjust);
int fontSize = Math.Max(10, element.Bounds.Height);
tf.DrawString(element.Text, new XFont("Times New Roman", fontSize, XFontStyle.Regular), XBrushes.Transparent, adjustedBounds);
var adjustedBounds = AdjustBounds(element.Bounds, hAdjust, vAdjust);
var adjustedFontSize = CalculateFontSize(element.Text, adjustedBounds, gfx);
tf.DrawString(element.Text, new XFont("Times New Roman", adjustedFontSize, XFontStyle.Regular), XBrushes.Transparent, adjustedBounds);
}
}
gfx.DrawImage(img, 0, 0, (int)realWidth, (int)realHeight);
@ -93,5 +92,20 @@ namespace NAPS2.ImportExport.Pdf
document.Save(path);
return true;
}
private static RectangleF AdjustBounds(Rectangle b, float hAdjust, float vAdjust)
{
var adjustedBounds = new RectangleF(b.X * hAdjust, b.Y * vAdjust, b.Width * hAdjust, b.Height * vAdjust);
return adjustedBounds;
}
private static int CalculateFontSize(string text, RectangleF adjustedBounds, XGraphics gfx)
{
int fontSizeGuess = Math.Max(1, (int)(adjustedBounds.Height));
var measuredBoundsForGuess = gfx.MeasureString(text, new XFont("Times New Roman", fontSizeGuess, XFontStyle.Regular));
double adjustmentFactor = adjustedBounds.Width / measuredBoundsForGuess.Width;
int adjustedFontSize = Math.Max(1, (int)Math.Round(fontSizeGuess * adjustmentFactor));
return adjustedFontSize;
}
}
}