ImGearPDFFixedMatrix Class

Visual Basic
C#
Managed Extensions for C++
C++/CLI

'Declaration
 
Public NotInheritable Class ImGearPDFFixedMatrix

'Usage
 
Dim instance As ImGearPDFFixedMatrix

public sealed class ImGearPDFFixedMatrix

public __gc __sealed class ImGearPDFFixedMatrix

public ref class ImGearPDFFixedMatrix sealed

This class defines a transformation matrix for the content object, which usually corresponds to the Matrix key in the dictionary. A transformation matrix specifies the relationship between two coordinate systems. By modifying a transformation matrix, objects can be scaled, rotated, translated, or transformed in other ways. The transformation between two coordinate systems is represented by a 3-by-3 transformation matrix written as follows:

A B 0

C D 0

H V 1

A transformation matrix has only six elements that can be changed as the six-element array [ a b c d h v ]. It can represent any linear transformation from one coordinate system to another. The transformation matrix multiplication can be presented as follows:

x1 = x*A + y*C + H

y1 = x*B + y* D + V

The following lists the arrays that specify the most common transformations:

Translations are specified as [ 1 0 0 1 tx ty ], where tx and ty are the distances to translate the origin of the coordinate system in the horizontal and vertical dimensions, respectively.
Scaling is 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 are produced by [ cos Ang sin Ang -sin Ang cos Ang 0 0 ], which has the effect of rotating the coordinate system axes by an angle Ang counterclockwise.
Skew is 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.

If several transformations are combined, the order in which they are applied is significant. For example, first scaling and then translating the x axis is not the same as first translating and then scaling it.

In general, to obtain the expected results, transformations should be done in the following order:

Translate

RotateScale or skew

See section "4.2 Coordinate Systems" of the PDF Reference for more details.

System.Object
ImageGear.Formats.PDF.ImGearPDFFixedMatrix

Reference

ImGearPDFFixedMatrix Members
ImageGear.Formats.PDF Namespace