THPDFViewer Rotation

Rotates the displayed page and Viewer model snapshots in 90-degree steps without changing the PDF page dictionary

Declarations

property ViewRotation: Integer;
procedure RotateClockwise;
procedure RotateCounterClockwise;
procedure ResetViewRotation;
procedure ApplyViewRotation(Bitmap: TBitmap);

Usage notes

• ViewRotation is normalized to 0, 90, 180, or 270 degrees
• Assigning a new document resets the view rotation to zero
• Fit-page and fit-width calculations use the combined PDF page and view rotations
• Search hit overlays rotate with the rendered page
• CreatePageSnapshot, CreateCurrentPageSnapshot, and BMP output include the active view rotation
• ApplyViewRotation transforms a caller-owned bitmap in place through a 32-bit scan-line path

Example

PDFViewer.RotateClockwise;
Snapshot := PDFViewer.Model.CreateCurrentPageSnapshot(150);
try
  Snapshot.SaveToFile('rotated-page.bmp');
finally
  Snapshot.Free;
end;
PDFViewer.ResetViewRotation;