Changes the transformation represented by matrix to be the
transformation given by first applying transformation
given by new_matrix then applying the original transformation.

Parameters:

Pango.Matrix new_matrix Required (not null)

a PangoMatrix

Returns:

none

Copies a PangoMatrix.
be freed with pango_matrix_free(), or NULL if

Returns:

Pango.Matrix the newly allocated PangoMatrix, which should

Free a PangoMatrix created with pango_matrix_copy().

Returns:

none

Returns the scale factor of a matrix on the height of the font.
That is, the scale factor in the direction perpendicular to the
vector that the X coordinate is mapped to.
or 1.0 if matrix is NULL.

Returns:

gdouble the scale factor of matrix on the height of the font,

Changes the transformation represented by matrix to be the
transformation given by first rotating by degrees degrees
counter-clockwise then applying the original transformation.

Parameters:

gdouble degrees Required (not null)

degrees to rotate counter-clockwise

Returns:

none

Changes the transformation represented by matrix to be the
transformation given by first scaling by sx in the X direction
and sy in the Y direction then applying the original
transformation.

Parameters:

gdouble scale_x Required (not null)

amount to scale by in X direction

gdouble scale_y Required (not null)

amount to scale by in Y direction

Returns:

none

Transforms the distance vector (dx,dy) by matrix. This is
similar to pango_matrix_transform_point() except that the translation
components of the transformation are ignored. The calculation of
the returned vector is as follows:

dx2 = dx1 * xx + dy1 * xy;
dy2 = dx1 * yx + dy1 * yy;

Affine transformations are position invariant, so the same vector
always transforms to the same vector. If (x1,y1) transforms
to (x2,y2) then (x1+dx1,y1+dy1) will transform to
(x1+dx2,y1+dy2) for all values of x1 and x2.

Parameters:

gdouble dx Required (not null)

in/out X component of a distance vector

gdouble dy Required (not null)

yn/out Y component of a distance vector

Returns:

none

First transforms the rect using matrix, then calculates the bounding box
of the transformed rectangle. The rectangle should be in device units
(pixels).
This function is useful for example when you want to draw a rotated
should be and how much you should shift the layout when rendering.
For better accuracy, you should use pango_matrix_transform_rectangle() on
original rectangle in Pango units and convert to pixels afterward
using pango_extents_to_pixels()'s first argument.

Parameters:

Pango.Rectangle rect Required (not null)

in/out bounding box in device units, or NULL

Returns:

none

Transforms the point (x, y) by matrix.

Parameters:

gdouble x Required (not null)

in/out X position

gdouble y Required (not null)

in/out Y position

Returns:

none

First transforms rect using matrix, then calculates the bounding box
of the transformed rectangle. The rectangle should be in Pango units.
This function is useful for example when you want to draw a rotated
should be and how much you should shift the layout when rendering.
If you have a rectangle in device units (pixels), use
pango_matrix_transform_pixel_rectangle().
If you have the rectangle in Pango units and want to convert to
transformed pixel bounding box, it is more accurate to transform it first
(using this function) and pass the result to pango_extents_to_pixels(),
first argument, for an inclusive rounded rectangle.
However, there are valid reasons that you may want to convert
to pixels first and then transform, for example when the transformed
coordinates may overflow in Pango units (large matrix translation for
example).

Parameters:

Pango.Rectangle rect Required (not null)

in/out bounding box in Pango units, or NULL

Returns:

none

Changes the transformation represented by matrix to be the
transformation given by first translating by (tx, ty)
then applying the original transformation.

Parameters:

gdouble tx Required (not null)

amount to translate in the X direction

gdouble ty Required (not null)

amount to translate in the Y direction

Returns:

none