Commit a9fb4f9a authored by Michael Natterer's avatar Michael Natterer 😴

pdb: make all item-transform procedures honor the "linked" flag

and improve their documentation.
parent b80036e1
This diff is collapsed.
......@@ -89,15 +89,22 @@ gimp_item_transform_translate (gint32 item_ID,
*
* Flip the specified item either vertically or horizontally.
*
* This procedure flips the specified item. If a selection exists and
* the item is a drawable, the portion of the drawable which lies under
* the selection is cut from the drawable and made into a floating
* selection which is then flipped. If auto_center is set to TRUE, the
* flip is around the selection's center. Otherwise, the coordinate of
* the axis needs to be specified. The return value is the ID of the
* flipped item. If there was no selection or the item is not a
* drawable, this will be equal to the item ID supplied as input.
* Otherwise, this will be the newly created and flipped drawable.
* This procedure flips the specified item.
*
* If a selection exists and the item is a drawable, the portion of the
* drawable which lies under the selection is cut from the drawable and
* made into a floating selection which is then flipped. If auto_center
* is set to TRUE, the flip is around the selection's center.
* Otherwise, the coordinate of the axis needs to be specified. The
* return value is the ID of the flipped floating selection.
*
* If there is no selection or the item is not a drawable, the entire
* item will be flipped around its center if auto_center is set to
* TRUE, otherwise the coordinate of the axis needs to be specified.
* Additionally, if the item has its linked flag set to TRUE, all
* additional items contained in the image which have the linked flag
* set to TRUE will also be flipped around the same axis. The return
* value will be equal to the item ID supplied as input.
*
* This procedure is affected by the following context setters:
* gimp_context_set_transform_resize().
......@@ -142,15 +149,20 @@ gimp_item_transform_flip_simple (gint32 item_ID,
*
* Flip the specified item around a given line.
*
* This procedure flips the specified item. If a selection exists and
* the item is a drawable , the portion of the drawable which lies
* under the selection is cut from the drawable and made into a
* floating selection which is then flipped. The axis to flip around is
* specified by specifying two points from that line. The return value
* is the ID of the flipped item. If there was no selection or the item
* is not a drawable, this will be equal to the item ID supplied as
* input. Otherwise, this will be the newly created and flipped
* drawable.
* This procedure flips the specified item.
*
* If a selection exists and the item is a drawable, the portion of the
* drawable which lies under the selection is cut from the drawable and
* made into a floating selection which is then flipped. The axis to
* flip around is specified by specifying two points from that line.
* The return value is the ID of the flipped floating selection.
*
* If there is no selection or the item is not a drawable, the entire
* item will be flipped around the specified axis. Additionally, if the
* item has its linked flag set to TRUE, all additional items contained
* in the image which have the linked flag set to TRUE will also be
* flipped around the same axis. The return value will be equal to the
* item ID supplied as input.
*
* This procedure is affected by the following context setters:
* gimp_context_set_interpolation(),
......@@ -205,27 +217,34 @@ gimp_item_transform_flip (gint32 item_ID,
*
* This procedure performs a possibly non-affine transformation on the
* specified item by allowing the corners of the original bounding box
* to be arbitrarily remapped to any values. The specified item is
* remapped if no selection exists or it is not a drawable. However, if
* a selection exists and the item is a drawable, the portion of the
* to be arbitrarily remapped to any values.
*
* The 4 coordinates specify the new locations of each corner of the
* original bounding box. By specifying these values, any affine
* transformation (rotation, scaling, translation) can be affected.
* Additionally, these values can be specified such that the resulting
* transformed item will appear to have been projected via a
* perspective transform.
*
* If a selection exists and the item is a drawable, the portion of the
* drawable which lies under the selection is cut from the drawable and
* made into a floating selection which is then remapped as specified.
* The return value is the ID of the remapped item. If there was no
* selection or the item is not a drawable, this will be equal to the
* item ID supplied as input. Otherwise, this will be the newly created
* and remapped drawable. The 4 coordinates specify the new locations
* of each corner of the original bounding box. By specifying these
* values, any affine transformation (rotation, scaling, translation)
* can be affected. Additionally, these values can be specified such
* that the resulting transformed item will appear to have been
* projected via a perspective transform.
* made into a floating selection which is then transformed as
* specified. The return value is the ID of the transformed floating
* selection.
*
* If there is no selection or the item is not a drawable, the entire
* item will be transformed according to the specified mapping.
* Additionally, if the item has its linked flag set to TRUE, all
* additional items contained in the image which have the linked flag
* set to TRUE will also be transformed the same way. The return value
* will be equal to the item ID supplied as input.
*
* This procedure is affected by the following context setters:
* gimp_context_set_interpolation(),
* gimp_context_set_transform_direction(),
* gimp_context_set_transform_resize().
*
* Returns: The newly mapped item.
* Returns: The transformed item.
*
* Since: 2.8
**/
......@@ -276,14 +295,24 @@ gimp_item_transform_perspective (gint32 item_ID,
* Rotate the specified item about given coordinates through the
* specified angle.
*
* This function rotates the specified item. If a selection exists and
* the item is a drawable, the portion of the drawable which lies under
* the selection is cut from the drawable and made into a floating
* selection which is then rotated by the specified amount. The return
* value is the ID of the rotated item. If there was no selection or
* the item is not a drawable, this will be equal to the item ID
* supplied as input. Otherwise, this will be the newly created and
* rotated drawable.
* This function rotates the specified item.
*
* If a selection exists and the item is a drawable, the portion of the
* drawable which lies under the selection is cut from the drawable and
* made into a floating selection which is then rotated by the
* specified amount. If auto_center is set to TRUE, the rotation is
* around the selection's center. Otherwise, the coordinate of the
* center point needs to be specified. The return value is the ID of
* the rotated floating selection.
*
* If there is no selection or the item is not a drawable, the entire
* item will be rotated around its center if auto_center is set to
* TRUE, otherwise the coordinate of the center point needs to be
* specified. Additionally, if the item has its linked flag set to
* TRUE, all additional items contained in the image which have the
* linked flag set to TRUE will also be rotated around the same center
* point. The return value will be equal to the item ID supplied as
* input.
*
* This procedure is affected by the following context setters:
* gimp_context_set_transform_resize().
......@@ -331,14 +360,24 @@ gimp_item_transform_rotate_simple (gint32 item_ID,
* Rotate the specified item about given coordinates through the
* specified angle.
*
* This function rotates the specified item. If a selection exists and
* the item is a drawable, the portion of the drawable which lies under
* the selection is cut from the drawable and made into a floating
* selection which is then rotated by the specified amount. The return
* value is the ID of the rotated item. If there was no selection or
* the item is not a drawable, this will be equal to the item ID
* supplied as input. Otherwise, this will be the newly created and
* rotated drawable.
* This function rotates the specified item.
*
* If a selection exists and the item is a drawable, the portion of the
* drawable which lies under the selection is cut from the drawable and
* made into a floating selection which is then rotated by the
* specified amount. If auto_center is set to TRUE, the rotation is
* around the selection's center. Otherwise, the coordinate of the
* center point needs to be specified. The return value is the ID of
* the rotated floating selection.
*
* If there is no selection or the item is not a drawable, the entire
* item will be rotated around its center if auto_center is set to
* TRUE, otherwise the coordinate of the center point needs to be
* specified. Additionally, if the item has its linked flag set to
* TRUE, all additional items contained in the image which have the
* linked flag set to TRUE will also be rotated around the same center
* point. The return value will be equal to the item ID supplied as
* input.
*
* This procedure is affected by the following context setters:
* gimp_context_set_interpolation(),
......@@ -387,14 +426,22 @@ gimp_item_transform_rotate (gint32 item_ID,
*
* Scale the specified item.
*
* This procedure scales the specified item. If a selection exists and
* the item is a drawable, the portion of the drawable which lies under
* the selection is cut from the drawable and made into a floating
* selection which is then scaled by the specified amount. The return
* value is the ID of the scaled item. If there was no selection or the
* item is not a drawable, this will be equal to the item ID supplied
* as input. Otherwise, this will be the newly created and scaled
* drawable.
* This procedure scales the specified item.
*
* The 2 coordinates specify the new locations of the top-left and
* bottom-roght corners of the original bounding box.
*
* If a selection exists and the item is a drawable, the portion of the
* drawable which lies under the selection is cut from the drawable and
* made into a floating selection which is then scaled as specified.
* The return value is the ID of the scaled floating selection.
*
* If there is no selection or the item is not a drawable, the entire
* item will be scaled according to the specified coordinates.
* Additionally, if the item has its linked flag set to TRUE, all
* additional items contained in the image which have the linked flag
* set to TRUE will also be scaled the same way. The return value will
* be equal to the item ID supplied as input.
*
* This procedure is affected by the following context setters:
* gimp_context_set_interpolation(),
......@@ -442,17 +489,23 @@ gimp_item_transform_scale (gint32 item_ID,
* Shear the specified item about its center by the specified
* magnitude.
*
* This procedure shears the specified item. If a selection exists and
* the item is a drawable, the portion of the drawable which lies under
* the selection is cut from the drawable and made into a floating
* selection which is then sheard by the specified amount. The return
* value is the ID of the sheard item. If there was no selection or the
* item is not a drawable, this will be equal to the item ID supplied
* as input. Otherwise, this will be the newly created and sheard
* drawable. The shear type parameter indicates whether the shear will
* be applied horizontally or vertically. The magnitude can be either
* positive or negative and indicates the extent (in pixels) to shear
* by.
* This procedure shears the specified item.
*
* The shear type parameter indicates whether the shear will be applied
* horizontally or vertically. The magnitude can be either positive or
* negative and indicates the extent (in pixels) to shear by.
*
* If a selection exists and the item is a drawable, the portion of the
* drawable which lies under the selection is cut from the drawable and
* made into a floating selection which is then sheared as specified.
* The return value is the ID of the sheared floating selection.
*
* If there is no selection or the item is not a drawable, the entire
* item will be sheared according to the specified parameters.
* Additionally, if the item has its linked flag set to TRUE, all
* additional items contained in the image which have the linked flag
* set to TRUE will also be sheared the same way. The return value will
* be equal to the item ID supplied as input.
*
* This procedure is affected by the following context setters:
* gimp_context_set_interpolation(),
......@@ -500,17 +553,25 @@ gimp_item_transform_shear (gint32 item_ID,
*
* Transform the specified item in 2d.
*
* This procedure transforms the specified item. If a selection exists
* and the item is a drawable, the portion of the drawable which lies
* under the selection is cut from the drawable and made into a
* floating selection which is then transformed. The transformation is
* done by scaling the image by the x and y scale factors about the
* point (source_x, source_y), then rotating around the same point,
* then translating that point to the new position (dest_x, dest_y).
* The return value is the ID of the rotated drawable. If there was no
* selection or the item is not a drawable, this will be equal to the
* item ID supplied as input. Otherwise, this will be the newly created
* and transformed drawable.
* This procedure transforms the specified item.
*
* The transformation is done by scaling by the x and y scale factors
* about the point (source_x, source_y), then rotating around the same
* point, then translating that point to the new position (dest_x,
* dest_y).
*
* If a selection exists and the item is a drawable, the portion of the
* drawable which lies under the selection is cut from the drawable and
* made into a floating selection which is then transformed as
* specified. The return value is the ID of the transformed floating
* selection.
*
* If there is no selection or the item is not a drawable, the entire
* item will be transformed according to the specified parameters.
* Additionally, if the item has its linked flag set to TRUE, all
* additional items contained in the image which have the linked flag
* set to TRUE will also be transformed the same way. The return value
* will be equal to the item ID supplied as input.
*
* This procedure is affected by the following context setters:
* gimp_context_set_interpolation(),
......@@ -570,15 +631,23 @@ gimp_item_transform_2d (gint32 item_ID,
*
* Transform the specified item in 2d.
*
* This procedure transforms the specified item. If a selection exists
* and the item is a drawable, the portion of the drawable which lies
* under the selection is cut from the drawable and made into a
* floating selection which is then transformed. The transformation is
* done by assembling a 3x3 matrix from the coefficients passed. The
* return value is the ID of the transformed item. If there was no
* selection or the item is not a drawable, this will be equal to the
* item ID supplied as input. Otherwise, this will be the newly created
* and transformed drawable.
* This procedure transforms the specified item.
*
* The transformation is done by assembling a 3x3 matrix from the
* coefficients passed.
*
* If a selection exists and the item is a drawable, the portion of the
* drawable which lies under the selection is cut from the drawable and
* made into a floating selection which is then transformed as
* specified. The return value is the ID of the transformed floating
* selection.
*
* If there is no selection or the item is not a drawable, the entire
* item will be transformed according to the specified matrix.
* Additionally, if the item has its linked flag set to TRUE, all
* additional items contained in the image which have the linked flag
* set to TRUE will also be transformed the same way. The return value
* will be equal to the item ID supplied as input.
*
* This procedure is affected by the following context setters:
* gimp_context_set_interpolation(),
......
......@@ -79,6 +79,14 @@ $assemble_matrix
else
success = FALSE;
}
else if (gimp_item_get_linked (item))
{
gimp_item_linked_transform (item, context, &matrix,
pdb_context->transform_direction,
pdb_context->interpolation,
pdb_context->transform_resize,
progress);
}
else
{
gimp_item_transform (item, context, &matrix,
......@@ -158,15 +166,24 @@ Flip the specified item either vertically or horizontally.
BLURB
$help = <<'HELP';
This procedure flips the specified item. If a selection exists and the
item is a drawable, the portion of the drawable which lies under the
selection is cut from the drawable and made into a floating selection
which is then flipped. If auto_center is set to TRUE, the flip is
around the selection's center. Otherwise, the coordinate of the axis
needs to be specified. The return value is the ID of the flipped
item. If there was no selection or the item is not a drawable, this
will be equal to the item ID supplied as input. Otherwise, this will
be the newly created and flipped drawable.
This procedure flips the specified item.
If a selection exists and the item is a drawable, the portion of the
drawable which lies under the selection is cut from the drawable and
made into a floating selection which is then flipped. If auto_center
is set to TRUE, the flip is around the selection's center. Otherwise,
the coordinate of the axis needs to be specified. The return value is
the ID of the flipped floating selection.
If there is no selection or the item is not a drawable, the entire
item will be flipped around its center if auto_center is set to TRUE,
otherwise the coordinate of the axis needs to be specified.
Additionally, if the item has its linked flag set to TRUE, all
additional items contained in the image which have the linked flag set
to TRUE will also be flipped around the same axis. The return value
will be equal to the item ID supplied as input.
This procedure is affected by the following context setters:
......@@ -229,6 +246,12 @@ HELP
else
success = FALSE;
}
else if (gimp_item_get_linked (item))
{
gimp_item_linked_flip (item, context,
flip_type, axis,
pdb_context->transform_resize);
}
else
{
gimp_item_flip (item, context,
......@@ -248,14 +271,22 @@ Flip the specified item around a given line.
BLURB
$help = <<'HELP';
This procedure flips the specified item. If a selection exists and the
item is a drawable , the portion of the drawable which lies under the
selection is cut from the drawable and made into a floating selection
which is then flipped. The axis to flip around is specified by
specifying two points from that line. The return value is the ID of
the flipped item. If there was no selection or the item is not a
drawable, this will be equal to the item ID supplied as input.
Otherwise, this will be the newly created and flipped drawable.
This procedure flips the specified item.
If a selection exists and the item is a drawable, the portion of the
drawable which lies under the selection is cut from the drawable and
made into a floating selection which is then flipped. The axis to flip
around is specified by specifying two points from that line. The
return value is the ID of the flipped floating selection.
If there is no selection or the item is not a drawable, the entire
item will be flipped around the specified axis. Additionally, if the
item has its linked flag set to TRUE, all additional items contained
in the image which have the linked flag set to TRUE will also be
flipped around the same axis. The return value will be equal to the
item ID supplied as input.
This procedure is affected by the following context setters:
......@@ -298,20 +329,29 @@ BLURB
$help = <<'HELP';
This procedure performs a possibly non-affine transformation on the
specified item by allowing the corners of the original bounding box to
be arbitrarily remapped to any values. The specified item is remapped
if no selection exists or it is not a drawable. However, if a
selection exists and the item is a drawable, the portion of the
be arbitrarily remapped to any values.
The 4 coordinates specify the new locations of each corner of the
original bounding box. By specifying these values, any affine
transformation (rotation, scaling, translation) can be affected.
Additionally, these values can be specified such that the resulting
transformed item will appear to have been projected via a perspective
transform.
If a selection exists and the item is a drawable, the portion of the
drawable which lies under the selection is cut from the drawable and
made into a floating selection which is then remapped as
specified. The return value is the ID of the remapped item. If there
was no selection or the item is not a drawable, this will be equal to
the item ID supplied as input. Otherwise, this will be the newly
created and remapped drawable. The 4 coordinates specify the new
locations of each corner of the original bounding box. By specifying
these values, any affine transformation (rotation, scaling,
translation) can be affected. Additionally, these values can be
specified such that the resulting transformed item will appear to
have been projected via a perspective transform.
made into a floating selection which is then transformed as specified.
The return value is the ID of the transformed floating selection.
If there is no selection or the item is not a drawable, the entire
item will be transformed according to the specified mapping.
Additionally, if the item has its linked flag set to TRUE, all
additional items contained in the image which have the linked flag set
to TRUE will also be transformed the same way. The return value will be
equal to the item ID supplied as input.
This procedure is affected by the following context setters:
......@@ -352,7 +392,7 @@ HELP
@outargs = (
{ name => 'item', type => 'item', no_declare => 1,
desc => 'The newly mapped item' }
desc => 'The transformed item' }
);
transform_invoke ("Perspective", <<CODE);
......@@ -371,13 +411,25 @@ Rotate the specified item about given coordinates through the specified angle.
BLURB
$help = <<'HELP';
This function rotates the specified item. If a selection exists and
the item is a drawable, the portion of the drawable which lies under
the selection is cut from the drawable and made into a floating
selection which is then rotated by the specified amount. The return
value is the ID of the rotated item. If there was no selection or the
item is not a drawable, this will be equal to the item ID supplied as
input. Otherwise, this will be the newly created and rotated drawable.
This function rotates the specified item.
If a selection exists and the item is a drawable, the portion of the
drawable which lies under the selection is cut from the drawable and
made into a floating selection which is then rotated by the specified
amount. If auto_center is set to TRUE, the rotation is around the
selection's center. Otherwise, the coordinate of the center point
needs to be specified. The return value is the ID of the rotated
floating selection.
If there is no selection or the item is not a drawable, the entire
item will be rotated around its center if auto_center is set to TRUE,
otherwise the coordinate of the center point needs to be specified.
Additionally, if the item has its linked flag set to TRUE, all
additional items contained in the image which have the linked flag set
to TRUE will also be rotated around the same center point. The return
value will be equal to the item ID supplied as input.
This procedure is affected by the following context setters:
......@@ -443,6 +495,13 @@ HELP
else
success = FALSE;
}
else if (gimp_item_get_linked (item))
{
gimp_item_linked_rotate (item, context,
rotate_type,
center_x, center_y,
pdb_context->transform_resize);
}
else
{
gimp_item_rotate (item, context,
......@@ -464,13 +523,25 @@ specified angle.
BLURB
$help = <<'HELP';
This function rotates the specified item. If a selection exists and
the item is a drawable, the portion of the drawable which lies under
the selection is cut from the drawable and made into a floating
selection which is then rotated by the specified amount. The return
value is the ID of the rotated item. If there was no selection or the
item is not a drawable, this will be equal to the item ID supplied as
input. Otherwise, this will be the newly created and rotated drawable.
This function rotates the specified item.
If a selection exists and the item is a drawable, the portion of the
drawable which lies under the selection is cut from the drawable and
made into a floating selection which is then rotated by the specified
amount. If auto_center is set to TRUE, the rotation is around the
selection's center. Otherwise, the coordinate of the center point
needs to be specified. The return value is the ID of the rotated
floating selection.
If there is no selection or the item is not a drawable, the entire
item will be rotated around its center if auto_center is set to TRUE,
otherwise the coordinate of the center point needs to be specified.
Additionally, if the item has its linked flag set to TRUE, all
additional items contained in the image which have the linked flag set
to TRUE will also be rotated around the same center point. The return
value will be equal to the item ID supplied as input.
This procedure is affected by the following context setters:
......@@ -514,13 +585,25 @@ sub item_transform_scale {
$blurb = 'Scale the specified item.';
$help = <<'HELP';
This procedure scales the specified item. If a selection exists and
the item is a drawable, the portion of the drawable which lies under
the selection is cut from the drawable and made into a floating
selection which is then scaled by the specified amount. The return
value is the ID of the scaled item. If there was no selection or the
item is not a drawable, this will be equal to the item ID supplied as
input. Otherwise, this will be the newly created and scaled drawable.
This procedure scales the specified item.
The 2 coordinates specify the new locations of the top-left and
bottom-roght corners of the original bounding box.
If a selection exists and the item is a drawable, the portion of the
drawable which lies under the selection is cut from the drawable and
made into a floating selection which is then scaled as specified. The
return value is the ID of the scaled floating selection.
If there is no selection or the item is not a drawable, the entire
item will be scaled according to the specified coordinates.
Additionally, if the item has its linked flag set to TRUE, all
additional items contained in the image which have the linked flag set
to TRUE will also be scaled the same way. The return value will be
equal to the item ID supplied as input.
This procedure is affected by the following context setters:
......@@ -567,16 +650,26 @@ Shear the specified item about its center by the specified magnitude.
BLURB
$help = <<'HELP';
This procedure shears the specified item. If a selection exists and
the item is a drawable, the portion of the drawable which lies under
the selection is cut from the drawable and made into a floating
selection which is then sheard by the specified amount. The return
value is the ID of the sheard item. If there was no selection or the
item is not a drawable, this will be equal to the item ID supplied as
input. Otherwise, this will be the newly created and sheard
drawable. The shear type parameter indicates whether the shear will be
applied horizontally or vertically. The magnitude can be either
positive or negative and indicates the extent (in pixels) to shear by.
This procedure shears the specified item.
The shear type parameter indicates whether the shear will be applied
horizontally or vertically. The magnitude can be either positive or
negative and indicates the extent (in pixels) to shear by.
If a selection exists and the item is a drawable, the portion of the
drawable which lies under the selection is cut from the drawable and
made into a floating selection which is then sheared as specified.
The return value is the ID of the sheared floating selection.
If there is no selection or the item is not a drawable, the entire
item will be sheared according to the specified parameters.
Additionally, if the item has its linked flag set to TRUE, all
additional items contained in the image which have the linked flag set
to TRUE will also be sheared the same way. The return value will be
equal to the item ID supplied as input.
This procedure is affected by the following context setters:
......@@ -614,17 +707,27 @@ sub item_transform_2d {
$blurb = 'Transform the specified item in 2d.';
$help = <<'HELP';
This procedure transforms the specified item. If a selection exists
and the item is a drawable, the portion of the drawable which lies
under the selection is cut from the drawable and made into a floating
selection which is then transformed. The transformation is done by
scaling the image by the x and y scale factors about the point
(source_x, source_y), then rotating around the same point, then
translating that point to the new position (dest_x, dest_y). The
return value is the ID of the rotated drawable. If there was no
selection or the item is not a drawable, this will be equal to the
item ID supplied as input. Otherwise, this will be the newly created
and transformed drawable.
This procedure transforms the specified item.
The transformation is done by scaling by the x and y scale factors
about the point (source_x, source_y), then rotating around the same
point, then translating that point to the new position (dest_x,
dest_y).
If a selection exists and the item is a drawable, the portion of the
drawable which lies under the selection is cut from the drawable and
made into a floating selection which is then transformed as specified.
The return value is the ID of the transformed floating selection.
If there is no selection or the item is not a drawable, the entire
item will be transformed according to the specified parameters.
Additionally, if the item has its linked flag set to TRUE, all
additional items contained in the image which have the linked flag set
to TRUE will also be transformed the same way. The return value will
be equal to the item ID supplied as input.
This procedure is affected by the following context setters:
......@@ -672,15 +775,25 @@ sub item_transform_matrix {
$blurb = 'Transform the specified item in 2d.';
$help = <<'HELP';
This procedure transforms the specified item. If a selection exists
and the item is a drawable, the portion of the drawable which lies
under the selection is cut from the drawable and made into a floating
selection which is then transformed. The transformation is done by
assembling a 3x3 matrix from the coefficients passed. The return
value is the ID of the transformed item. If there was no selection or
the item is not a drawable, this will be equal to the item ID supplied
as input. Otherwise, this will be the newly created and transformed
drawable.
This procedure transforms the specified item.
The transformation is done by assembling a 3x3 matrix from the
coefficients passed.
If a selection exists and the item is a drawable, the portion of the
drawable which lies under the selection is cut from the drawable and
made into a floating selection which is then transformed as specified.
The return value is the ID of the transformed floating selection.
If there is no selection or the item is not a drawable, the entire
item will be transformed according to the specified matrix.
Additionally, if the item has its linked flag set to TRUE, all
additional items contained in the image which have the linked flag set
to TRUE will also be transformed the same way. The return value will
be equal to the item ID supplied as input.
This procedure is affected by the following context setters:
......
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