Method

RsvgHandleget_geometry_for_element

since: 2.46

Declaration [src] 

gboolean
rsvg_handle_get_geometry_for_element (
  RsvgHandle* handle,
  const char* id,
  RsvgRectangle* out_ink_rect,
  RsvgRectangle* out_logical_rect,
  GError** error
)

Description [src]

Computes the ink rectangle and logical rectangle of a single SVG element.

While rsvg_handle_get_geometry_for_layer computes the geometry of an SVG element subtree with its transformation matrix, this other function will compute the element’s geometry as if it were being rendered under an identity transformation by itself. That is, the resulting geometry is as if the element got extracted by itself from the SVG.

This function is the counterpart to rsvg_handle_render_element.

Element IDs should look like an URL fragment identifier; for example, pass #foo (hash foo) to get the geometry of the element that has an id="foo" attribute.

The “ink rectangle” is the bounding box that would be painted for fully- stroked and filled elements.

The “logical rectangle” just takes into account the unstroked paths and text outlines.

Note that these bounds are not minimum bounds; for example, clipping paths are not taken into account.

You can pass NULL for the id if you want to measure all the elements in the SVG, i.e. to measure everything from the root element.

This operation is not constant-time, as it involves going through all the child elements.

Available since: 2.46

Parameters

id

Type: const char*

An element’s id within the SVG, starting with “#” (a single hash character), for example, #layer1. This notation corresponds to a URL’s fragment ID. Alternatively, pass NULL to compute the geometry for the whole SVG.

The argument can be NULL.
The data is owned by the caller of the method.
The value is a NUL terminated UTF-8 string.
out_ink_rect

Type: RsvgRectangle

Place to store the ink rectangle of the element.

The argument will be set by the function.
The argument can be NULL.
The returned data is owned by the instance.
out_logical_rect

Type: RsvgRectangle

Place to store the logical rectangle of the element.

The argument will be set by the function.
The argument can be NULL.
The returned data is owned by the instance.
error

Type: GError **

The return location for a recoverable error.

The argument can be NULL.
If the return location is not NULL, then you must initialize it to a NULL GError*.
The argument will be left initialized to NULL by the method if there are no errors.
In case of error, the argument will be set to a newly allocated GError; the caller will take ownership of the data, and be responsible for freeing it.

Return value

Type: gboolean

TRUE if the geometry could be obtained, or FALSE on error. Errors are returned in the error argument.

API ordering: This function must be called on a fully-loaded handle. See the section “API ordering” for details.

Panics: this function will panic if the handle is not fully-loaded.