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com.itextpdf.kernel.geom Documentation Differences

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Class AffineTransform

The AffineTransform class represents an affine transformation, which is a combination of linear transformations such as translation, scaling, rotation, and shearing which allows preservation of the straightness of lines.

Note: this class is a special case of a 3 by 3 Matrix.
Class AffineTransform, constructor AffineTransform(double, double, double, double, double, double)

Create an AffineTransform instance with the values provided. The default type is for the transformation is {@code TYPE_UNKNOWN} Detailed explanation of parameters can be found in Matrix documentation. @param m00 The value of the first row and first column of the matrix. @param m10 The value of the second row and first column of the matrix. @param m01 The value of the first row and second column of the matrix. @param m11 The value of the second row and second column of the matrix. @param m02 The value of the first row and third column of the matrix. @param m12 The value of the second row and third column of the matrix.
Class AffineTransform, constructor AffineTransform(double[])

Create an AffineTransform instance with the values provided. The default type is for the transformation is {@code TYPE_UNKNOWN} Detailed explanation of parameters can be found in Matrix documentation. @param matrix The array of values to be used for the transformation matrix.
Class AffineTransform, constructor AffineTransform(float[])

Create an AffineTransform instance with the values provided. The default type is for the transformation is {@code TYPE_UNKNOWN} Detailed explanation of parameters can be found in Matrix documentation. @param matrix The array of values to be used for the transformation matrix.
Class Matrix

Keeps all the values of a 3 by 3 matrix and allows you to to do some math with matrices.

Transformation matrix in PDF is a special case of a 3 by 3 matrix
{@code [a b 0]}
{@code [c d 0]}
{@code [e f 1]}

In its most general form, this matrix is specified by six numbers, usually in the form of an array containing six elements {@code [a b c d e f]}. It can represent any linear transformation from one coordinate system to another. Here the most common transformations:

  • Translations shall be specified as {@code [1 0 0 1 Tx Ty]}, where {@code Tx} and {@code 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 {@code [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 {@code Sx} and {@code Sy} units, respectively, in the previous coordinate system.
  • Rotations shall be produced by {@code [Rc Rs -Rs Rc 0 0]}, where {@code Rc = cos(q)} and {@code Rs = sin(q)} which has the effect of rotating the coordinate system axes by an angle {@code q} counterclockwise.
  • Skew shall be specified by {@code [1 Wx Wy 1 0 0]}, where {@code Wx = tan(a)} and {@code Wy = tan(b)} which skews the x-axis by an angle {@code a} and the y-axis by an angle {@code b}.

For more information see PDF Specification ISO 32000-1 section 8.3.
Class Matrix, constructor Matrix()

constructs Constructs a new Matrix with identity.
Class Matrix, Matrix multiply(Matrix)

multiplies this matrix by 'b' and returns the result. See http://en.wikipedia.org/wiki/ Matrix_ multiplication multiplication @param by The matrix to multiply by @return the resulting matrix
Class Matrix, int I11

the The row=1, col=1 position ('a') in the matrix.
Class Matrix, int I12

the The row=1, col=2 position ('b') in the matrix.
Class Matrix, int I13

the The row=1, col=3 position (always 0 for 2-D 2D) in the matrix.
Class Matrix, int I21

the The row=2, col=1 position ('c') in the matrix.
Class Matrix, int I22

the The row=2, col=2 position ('d') in the matrix.
Class Matrix, int I23

the The row=2, col=3 position (always 0 for 2-D 2D) in the matrix.
Class Matrix, int I31

the The row=3, col=1 ('e', or X translation) position in the matrix.
Class Matrix, int I32

the The row=3, col=2 ('f', or Y translation) position in the matrix.
Class Matrix, int I33

the The row=3, col=3 position (always 1 for 2-D 2D) in the matrix.
Class Rectangle, Rectangle getRectangleOnRotatedPage(Rectangle, PdfPage)

Gets the Transforms a rectangle defined in the space of unrotated origin (bottom-left) into coordinates as it looks would appear on the a passed as parameter rotated page page. and

returns the rectangle in This method is useful coordinates when adding annotations, form fields, or relevant other elements to the true a PDF page origin that has a rotation. This rectangle can be used The iText coordinate system always to uses the add bottom-left annotations corner as origin, fields regardless of page rotation. This method compensates for that rotation, and other objects returning a rectangle to positioned correctly in the rotated true page coordinate space. @param rect the rectangle as it defined in looks page-space on coordinates relative to the rotated page unrotated origin. @param page the page PdfPage on to which one the rectangle will be added. want The rotation of this page is used to process transform the rectangle coordinates. @return the newly a created new rectangle Rectangle with translated corrected coordinates suitable for placement in the rotated coordinate space of the page.