Matrix Class Documentation
class MatrixNamespace:com::datalogics::PDFL
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
Uses types
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: doublenb: doublenc: doublend: doublenh: doublenv: double
Member Function Documentation
concat
Parameters
Mt: Matrix
Returns:
Matrixthe 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.
delete
synchronized void delete(Boolean disposing)Parameters
disposing: Boolean
Returns:
synchronized voiddelete
synchronized void delete()Returns:
synchronized voidequals
boolean equals(Object rhs)Parameters
rhs: Object
Returns:
booleanfinalize
void finalize()Returns:
voidgetA
double getA()Returns:
doublegetB
double getB()Returns:
doublegetC
double getC()Returns:
doublegetD
double getD()Returns:
doublegetH
double getH()Returns:
doublegetV
double getV()Returns:
doubleinvert
Matrix invert()Returns:
MatrixInvert the Matrix object and return a new Matrix object.
multiply
Parameters
Returns:
Matrixthe matrix product m1 x m2
Multiply two transformation matrices.
rotate
Matrix rotate(double T)Parameters
T: doubleThe rotation, counterclockwise
Returns:
Matrixthe 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: doubleX scaling factor
sy: doubleY scaling factor
Returns:
Matrixthe 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.
setA
void setA(double value)Parameters
value: double
Returns:
voidsetB
void setB(double value)Parameters
value: double
Returns:
voidsetC
void setC(double value)Parameters
value: double
Returns:
voidsetD
void setD(double value)Parameters
value: double
Returns:
voidsetH
void setH(double value)Parameters
value: double
Returns:
voidsetV
void setV(double value)Parameters
value: double
Returns:
voidtoString
String toString()Returns:
Stringtranslate
Matrix translate(double tx, double ty)Parameters
tx: doubleX translation distance
ty: doubleY translation distance
Returns:
Matrixthe 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.