PDFiumVCL 文件

PointsToPixels method

此 API 條目保留識別符號、簽名、程式碼塊和 PDF 術語的原始形式。

Component: TPdf · Unit: PDFium

Convert PDF points to pixels at the given DPI.

Syntax

class function PointsToPixels(Points: Double; DPI: Integer = 96): Integer;

Description

Static helper that converts a measurement value between pixel / point / inch units. PDF coordinates are expressed in points (1 pt = 1/72 inch).

Convert PDF points to pixels at the given DPI. The conversion formula is Round(value * DPI / 72).

These helpers are class functions; you can call them without instantiating TPdf (e.g. TPdf.PointsToPixels(96)).

Remarks

DPI defaults to 96 (the Windows default screen DPI) when the parameter is omitted.
Use these helpers to translate between TBitmap pixel coordinates and PDF rectangles before passing them to AddImage / Annotation APIs.
Inverse conversions are available as the matching *To* functions on TPdf and TPdfView.

Example

var
  Margin: Double;
begin
  Margin := TPdf.PointsToPixels(300);
  Memo1.Lines.Add(Format('PointsToPixels(300) = %.4f', [Margin]));
end;

See Also

PixelsToInches, PixelsToPoints, PointsToInches