Matrix Class Documentation

class Matrix : SystemIDisposable

Namespace:Datalogics::PDFL

Inherits from:
SystemIDisposable

Detailed Description

A transformation matrix in a PDF file is specified by six numbers.

The matrix is usually in the form of an array containing the six elements [a b c d h v].

A translation is specified as [ 1 0 0 1 tx ty], where tx and ty are the distance to translate from the origin of the coordinate system in the horizontal and vertical dimension, respectively.

A scaling is obtained by [sx 0 0 sy 0 0]. This scales the coordinates so that 1 unit in the horizontal and vertical dimension of the new coordinate system is the same size as sx and sy units, respectively, as in the previous coordinate system.

A rotation is produced by [ cos T sin T -sin T cos T 0 0 ], which has the effect of rotating the coordinate system axes by an angle T (degrees) counterclockwise.

This material indicates that the matrix specifying a transformation is premultiplied with the current transformation matrix, i.e.,

M' = Mt * M

The implementation of the Scale, Rotate, and Translate convenience functions of Matrix reflect the same order of operations, so that they are consistent with the PDF Reference manual. They are also consistent with the scale, rotate, and translate operators in PostScript, from which the coordinate system model in PDF is derived.

Referenced by

ContainerContentDrawParamsElementFormGroupImageMatrixPagePathPointPostScriptQuadRectShadingTextTextRun

Uses types

Matrix

Constructor & Destructor Documentation

Matrix

Matrix()

the default constructor creates a transformation matrix to translate the rectangle 1 element (1/72nd of an inch) from the origin.

Matrix

Matrix(double na, double nb, double nc, double nd, double nh, double nv)

Parameters

na: double
nb: double
nc: double
nd: double
nh: double
nv: double

Property Documentation

A

double A[get, set]

B

double B[get, set]

C

double C[get, set]

D

double D[get, set]

H

double H[get, set]

V

double V[get, set]

Member Function Documentation

Concat

Matrix Concat(Matrix Mt)

Parameters

Mt: Matrix

Returns:

Matrix

the transformed matrix

Concatenate a matrix onto an existing matrix.

The product returned is:

M' = Mt * M

This corresponds to the action of the cm operator.

Dispose

void Dispose()

Returns:

void

Equals

override bool Equals(object obj)

Parameters

obj: object

Returns:

override bool

Invert

Matrix Invert()

Returns:

Matrix

Invert the Matrix object and return a new Matrix object.

Rotate

Matrix Rotate(double T)

Parameters

T: double

The rotation, counterclockwise

Returns:

Matrix

the result [cos T sin T -sin T 0 0] * M

Rotate a matrix by T degrees counterclockwise units.

Rotation is done by creating the matrix [ cos T sin T -sin T cos T 0 0 ], and calling the Concat function with that matrix.

Scale

Matrix Scale(double sx, double sy)

Parameters

sx: double

X scaling factor

sy: double

Y scaling factor

Returns:

Matrix

the result [sx 0 0 sy 0 0] * M

Scale a matrix by (sx,sy) units.

Scaling is done by creating the matrix [sx 0 0 sy 0 0], and calling the Concat function with that matrix.

ToString

override string ToString()

Returns:

override string

Translate

Matrix Translate(double tx, double ty)

Parameters

tx: double

X translation distance

ty: double

Y translation distance

Returns:

Matrix

the result [1 0 0 1 tx ty] * M

Translate a matrix by (tx,ty) units.

Translation is done by creating the matrix [ 1 0 0 1 tx ty ], and calling the Concat function with that matrix.