AffineTransformRotate Method

Rotate.

Rotations are produced by [cos(a) sin(a) -sin(a) cos(a) 0 0], which has the effect of rotating the coordinate system axes by an angle "a" in counterclockwise direction around the origin.

If the given center is not , then the rotation is performed around the given center point, which is equivalent to the following sequence:

Translate(Double, Double) to center.
Rotate(Double, NullablePoint) by angle around the origin.
Translate(Double, Double) "back" to the original origin.

Namespace: PdfTools.Toolbox.Geometry.Real
Assembly: PdfTools.Toolbox (in PdfTools.Toolbox.dll) Version: 1.3.0+2e7887cb8ae45c4d911ad975ad001ac2f1f257d8

Syntax

Copy

public void Rotate(
	double angle,
	Point? center
)

Parameters

angle Double: The angle of the rotation in degrees.
center NullablePoint: The center of the rotation. If then the origin (0/0) is taken as center.

Exceptions

Exception	Condition
InvalidOperationException	If the affine transform is singular, e.g. default initialized. (Use Identity as an initial value.)

Reference

AffineTransform Structure

PdfTools.Toolbox.Geometry.Real Namespace