AppStd/EnvelopeGenerator
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Refactor PDF canvas transform to use Save/Restore state

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Move Y-axis flip transform inside signature drawing block and
wrap with SaveState/RestoreState to prevent side effects on
other drawing operations and pages. Removes redundant
page-level transformation for better encapsulation.
This commit is contained in:
tekh
2026-03-10 04:07:37 +01:00
parent b20aafe7a5
commit 1f5468b1ac
1 changed files with 5 additions and 7 deletions
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12
EnvelopeGenerator.PdfEditor/Pdf.cs
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@@ -105,17 +105,13 @@ namespace EnvelopeGenerator.PdfEditor
public Pdf<TInputStream, TOutputStream> Background<TSignature>(IEnumerable<TSignature> signatures, double widthPx = 1.9500000000000002, double heightPx = 2.52) public Pdf<TInputStream, TOutputStream> Background<TSignature>(IEnumerable<TSignature> signatures, double widthPx = 1.9500000000000002, double heightPx = 2.52)
where TSignature : ISignature where TSignature : ISignature
{ {
// once per page
Page(page =>
{
var canvas = new PdfCanvas(page);
canvas.ConcatMatrix(1, 0, 0, -1, 0, page.GetPageSize().GetHeight());
});
foreach (var signature in signatures) foreach (var signature in signatures)
Page(signature.Page, page => Page(signature.Page, page =>
{ {
var canvas = new PdfCanvas(page); var canvas = new PdfCanvas(page);
canvas.SaveState();
canvas.ConcatMatrix(1, 0, 0, -1, 0, page.GetPageSize().GetHeight());
double inchFactor = 72; double inchFactor = 72;
double magin = .2; double magin = .2;
double x = (signature.X - .7 - magin) * inchFactor; double x = (signature.X - .7 - magin) * inchFactor;
@@ -134,6 +130,8 @@ namespace EnvelopeGenerator.PdfEditor
canvas.SetFillColor(new DeviceRgb(204, 202, 198)) canvas.SetFillColor(new DeviceRgb(204, 202, 198))
.Rectangle(x, y + height - bottomLineLength, width, bottomLineLength) .Rectangle(x, y + height - bottomLineLength, width, bottomLineLength)
.Fill(); .Fill();
canvas.RestoreState();
}); });
return this; return this;