`pdfRotateCoords`

Concatenate a rotation (by alpha degrees, counter-clockwise)

BOOL32 __stdcall pdfRotateCoords(PPDF IPDF, double alpha, double OriginX, double OriginY);

Delphi

function pdfRotateCoords(const IPDF: PPDF; alpha, OriginX, OriginY: Double): LongBool; stdcall;

Purpose. Concatenate a rotation (by alpha degrees, counter-clockwise) around an arbitrary pivot point (OriginX, OriginY) onto the current transform.

Description. Computes the standard rotate-about-a-point 2×3 affine matrix (cos/sin of alpha converted from degrees to radians, with the translation terms derived so the pivot point itself is fixed under the rotation) and applies it via the same cm-emit-plus-ComposeCTM pattern as pdfSetMatrix. Equivalent to, but more convenient than, computing that matrix by hand and calling pdfSetMatrix.

Parameters.

Parameter	Description
`IPDF`	Document handle.
`alpha`	Rotation angle in degrees, counter-clockwise.
`OriginX`, `OriginY`	Pivot point, in the current (pre-rotation) coordinate system.

Return value. True on success; False if there is no current content stream.

See also. pdfScaleCoords, pdfSkewCoords.

C# (P/Invoke)

wrappers/dotnet/LumasPdf.cs

[return: MarshalAs(UnmanagedType.Bool)]

Area

Graphics