happypdf / TransformationMatrix

Type Alias: TransformationMatrix

type TransformationMatrix = [number, number, number, number, number, number];

Defined in: src/types/matrix.ts:20

A transformation matrix according to section 8.3.3 Common Transformations of the PDF specification (page 117).

To cite from the spec:

• Translations shall be specified as [1 0 0 1 tx ty], where tx and ty shall be the distances to translate the origin of the coordinate system in the horizontal and vertical dimensions, respectively.
• Scaling shall be obtained by [sx 0 0 sy 0 0]. This scales the coordinates so that 1 unit in the horizontal and vertical dimensions of the new coordinate system is the same size as sx and sy units, respectively, in the previous coordinate system.
• Rotations shall be produced by [cos(q) sin(q) -sin(q) cos(q) 0 0], which has the effect of rotating the coordinate system axes by an angle q counter clockwise.
• Skew shall be specified by [1 tan(a) tan(b) 1 0 0], which skews the x-axis by an angle a and the y axis by an angle b.