TekH
db70bbcebf
Introduced the `UnitOfLength` enum to represent measurement units (Inch and Point) for signature positioning, with detailed documentation and conversion logic. Updated `SignatureDto` to use `init` accessors for immutability, added backing fields for `X` and `Y` with conversion support, and introduced the `Factor` property to handle unit conversions. Added a `Convert` method to enable switching between units of length and improved extensibility for future `SenderAppType` support. Enhanced code readability and maintainability with detailed comments and remarks.
66 lines
2.6 KiB
C#
66 lines
2.6 KiB
C#
namespace EnvelopeGenerator.ReceiverUI.Models.Constants;
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/// <summary>
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/// Represents the unit of measurement for coordinate values in signature positioning.
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/// Used for converting coordinates between different systems (GdPicture14, PDF.js, iText7).
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/// </summary>
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public enum UnitOfLength
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{
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/// <summary>
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/// Inch unit (1 inch = 25.4 mm).
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/// This is the native unit used by GdPicture14 (EnvelopeGenerator.Form - Legacy VB.NET app).
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/// Database stores all coordinates (X, Y, Width, Height) in INCHES.
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/// </summary>
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/// <remarks>
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/// <b>Source:</b> GdPicture14.Annotations.AnnotationStickyNote uses INCHES natively.
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/// <br/>
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/// <b>Evidence:</b> VB.NET code directly assigns database values to annotation properties without conversion:
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/// <code>
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/// oAnnotation.Left = CSng(pElement.X) ' Direct assignment → INCHES
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/// oAnnotation.Top = CSng(pElement.Y)
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/// </code>
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/// <b>Standard Page Dimensions:</b>
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/// <list type="bullet">
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/// <item>A4: 8.27" × 11.69" (210mm × 297mm)</item>
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/// <item>Letter: 8.5" × 11"</item>
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/// </list>
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/// </remarks>
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Inch = 0,
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/// <summary>
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/// PDF Point unit (1 point = 1/72 inch).
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/// This is the standard unit used by PDF specification and PDF.js viewer.
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/// </summary>
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/// <remarks>
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/// <b>Definition:</b> According to PDF specification and Microsoft documentation:
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/// <br/>
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/// <i>"PDF pages are sized in point units. 1 pt == 1/72 inch"</i>
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/// <br/><br/>
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/// <b>Conversion Formula:</b>
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/// <code>
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/// points = inches * 72.0
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/// inches = points / 72.0
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/// </code>
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/// <b>Important:</b> Point ≠ Pixel!
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/// <list type="bullet">
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/// <item><b>Point (pt):</b> Device-independent unit (always 1/72 inch)</item>
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/// <item><b>Pixel (px):</b> Device-dependent unit (varies with screen DPI)</item>
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/// <item>At 72 DPI: 1 point = 1 pixel (coincidence)</item>
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/// <item>At 96 DPI: 1 point ≈ 1.33 pixels</item>
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/// <item>At 300 DPI: 1 point ≈ 4.17 pixels</item>
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/// </list>
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/// <b>Standard Page Dimensions (in points):</b>
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/// <list type="bullet">
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/// <item>A4: 595 × 842 points (8.27" × 11.69" × 72)</item>
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/// <item>Letter: 612 × 792 points (8.5" × 11" × 72)</item>
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/// </list>
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/// <b>Usage in EnvelopeGenerator:</b>
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/// <list type="bullet">
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/// <item>PDF.js viewer expects coordinates in points</item>
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/// <item>iText7 library uses points for PDF manipulation</item>
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/// <item>PSPDFKit (Web) uses points for annotation placement</item>
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/// </list>
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/// </remarks>
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Point
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}
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