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from copy import copy
import cubicsuperpath
import simpletransform
from ..svg import apply_transforms, get_guides
from ..svg.tags import SVG_GROUP_TAG, SVG_PATH_TAG
class Glyph(object):
"""Represents a single character in a single font variant.
For example, the font inkstitch_small may have variants for left-to-right,
right-to-left, etc. Each variant would have a set of Glyphs, one for each
character in that variant.
Properties:
width -- total width of this glyph including all component satins
node -- svg:g XML node containing the component satins in this character
"""
def __init__(self, group):
"""Create a Glyph.
The nodes will be copied out of their parent SVG document (with nested
transforms applied). The original nodes will be unmodified.
Arguments:
group -- an svg:g XML node containing all the paths that make up
this Glyph. Nested groups are allowed.
"""
self._process_baseline(group.getroottree().getroot())
self.node = self._process_group(group)
self._process_bbox()
self._move_to_origin()
def _process_group(self, group):
new_group = copy(group)
new_group.attrib.pop('transform', None)
del new_group[:] # delete references to the original group's children
for node in group:
if node.tag == SVG_GROUP_TAG:
new_group.append(self._process_group(node))
else:
node_copy = copy(node)
if "d" in node.attrib:
# Convert the path to absolute coordinates, incorporating all
# nested transforms.
path = cubicsuperpath.parsePath(node.get("d"))
apply_transforms(path, node)
node_copy.set("d", cubicsuperpath.formatPath(path))
# Delete transforms from paths and groups, since we applied
# them to the paths already.
node_copy.attrib.pop('transform', None)
new_group.append(node_copy)
return new_group
def _process_baseline(self, svg):
for guide in get_guides(svg):
if guide.label == "baseline":
self.baseline = guide.position.y
break
else:
# no baseline guide found, assume 0 for lack of anything better to use...
self.baseline = 0
def _process_bbox(self):
left, right, top, bottom = simpletransform.computeBBox(self.node.iterdescendants())
self.width = right - left
self.min_x = left
def _move_to_origin(self):
translate_x = -self.min_x
translate_y = -self.baseline
transform = "translate(%s, %s)" % (translate_x, translate_y)
for node in self.node.iter(SVG_PATH_TAG):
node.set('transform', transform)
simpletransform.fuseTransform(node)
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