def mat_image_to_img_node(image, img_node, fit=False):
"""Return mat which transforms from image to img_node coords."""
# 1 scale
# 2 if not fit: apply img_node offset
# 3 apply img_node transform
mat1 = mat.invert(mat.scale(*get_image_scale(image, img_node)))
mat2 = mat.offset(img_node) if not fit else mat.ident_mat()
mat3 = mat.copy_from(img_node)
return mat.compose_triplemat(mat1, mat2, mat3)
def mat_path_to_img_node(path, img_node, fit=False):
"""Return mat which transforms from path to img_node coords."""
# 1 apply path transform
# 2 apply path parent transform
# 3 reverse img_node parent transform
mat1 = mat.copy_from(path) if not fit else mat.ident_mat()
mat2 = mat.absolute(path.getparent())
mat3 = mat.invert(mat.absolute(img_node.getparent()))
return mat.compose_triplemat(mat1, mat2, mat3)
def mat_img_node_to_path(img_node, path, fit=False):
"""Return mat which transforms from img_node to path coords."""
# 1 apply img_node parent transform
# 2 reverse path parent transform
# 3 ??? reverse path transform
mat1 = mat.absolute(img_node.getparent())
mat2 = mat.invert(mat.absolute(path.getparent()))
# TODO: verify mat3 for fit option
mat3 = mat.invert(mat.copy_from(path)) if not fit else mat.ident_mat()
return mat.compose_triplemat(mat1, mat2, mat3)
def get_clip_geom(self, node, parents=False):
"""Return clipped node and clip bbox as csp (quadrilateral)."""
clip_base = node
clip_path_csp = None
clipped_node, clip_path_def = self.get_clip_def(node, parents)
if clip_path_def is not None:
clip_path_units = clip_path_def.get('clipPathUnits')
if clipped_node == clip_base:
if clip_path_units == 'objectBoundingBox':
# TODO: implement support for 'objectBoundingBox'
# 1. get geom box of clipped object (clip_base)
# 2. convert into a matrix transformation
# 3. pass matrix as cmat to get_clip_bbox_csp()
# until implemented, fall back to:
cmat = mat.ident_mat()
else:
cmat = mat.ident_mat()
else:
if clip_path_units == 'objectBoundingBox':
# TODO: implement support for 'objectBoundingBox'
# 1. get geom box of clipped group (clipped_node)
# 2. convert into a matrix transformation
# 3. compose with cmat (see below)
# 4. pass cmat to get_clip_bbox_csp()
# until implemented, fall back to:
umat = mat.ident_mat()
else:
umat = mat.ident_mat()
# compensate preserved transforms on nested groups
pmat = mat.compose_triplemat(
mat.copy_from(clipped_node),
mat.absolute_diff(clip_base, clipped_node),
mat.invert(mat.copy_from(clip_base)))
# finally, compose with matrix for clipPathUnits
# TODO: once we have real umat, check compose order!
cmat = mat.compose_doublemat(umat, pmat)
clip_path_csp = get_clip_bbox_csp(clip_path_def, cmat)
mat.apply_to(mat.invert(cmat), clip_path_csp)
return (clipped_node, clip_path_csp)