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# Authors: see git history
#
# Copyright (c) 2021 Authors
# Licensed under the GNU GPL version 3.0 or later. See the file LICENSE for details.
import json
from math import atan2, degrees
from inkex import Transform, errormsg
from inkex.units import convert_unit
from ..elements import Stroke
from ..i18n import _
from ..lettering import get_font_by_id
from ..svg import get_correction_transform
from ..svg.tags import EMBROIDERABLE_TAGS, INKSTITCH_LETTERING, SVG_GROUP_TAG
from ..utils import DotDict
from ..utils import Point as InkstitchPoint
from .base import InkstitchExtension
class LetteringAlongPath(InkstitchExtension):
'''
This extension aligns an Ink/Stitch Lettering group along a path
'''
def __init__(self, *args, **kwargs):
InkstitchExtension.__init__(self, *args, **kwargs)
self.arg_parser.add_argument("--notebook")
self.arg_parser.add_argument("-p", "--text-position", type=str, default='left', dest="text_position")
def effect(self):
# we ignore everything but the first path/text
text, path = self.get_selection()
if text is None or path is None:
errormsg(_("Please select one path and one Ink/Stitch lettering group."))
return
TextAlongPath(self.svg, text, path, self.options.text_position)
def get_selection(self):
groups = list()
paths = list()
for node in self.svg.selection:
lettering = False
if node.tag == SVG_GROUP_TAG and INKSTITCH_LETTERING in node.attrib:
groups.append(node)
lettering = True
continue
for group in node.iterancestors(SVG_GROUP_TAG):
if INKSTITCH_LETTERING in group.attrib:
groups.append(group)
lettering = True
break
if not lettering and node.tag in EMBROIDERABLE_TAGS:
paths.append(node)
if not groups or not paths:
return [None, None]
return [groups[0], paths[0]]
class TextAlongPath:
'''
Aligns an Ink/Stitch Lettering group along a path
'''
def __init__(self, svg, text, path, text_position):
self.svg = svg
self.text = text
self.path = Stroke(path).as_multi_line_string().geoms[0]
self.text_position = text_position
self.glyphs = [glyph for glyph in self.text.iterdescendants(SVG_GROUP_TAG) if glyph.label and len(glyph.label) == 1]
if not self.glyphs:
errormsg(_("The text doesn't contain any glyphs."))
return
self.load_settings()
if self.glyphs[0].get('transform', None) is not None:
self._reset_glyph_transforms()
hidden_commands = self.hide_commands()
space_indices, stretch_space, text_baseline = self.get_position_and_stretch_values()
start_position = self.get_start_position()
self.transform_glyphs(start_position, stretch_space, space_indices, text_baseline)
self.restore_commands(hidden_commands)
def _reset_glyph_transforms(self):
font = get_font_by_id(self.settings.font)
if font is not None:
try:
text_group = list(self.text.iterchildren(SVG_GROUP_TAG))[0]
except IndexError:
pass
for glyph in text_group.iterchildren():
glyph.delete()
rendered_text = font.render_text(
self.settings.text,
text_group,
None, # we don't know the font variant (?)
self.settings.back_and_forth,
self.settings.trim_option,
self.settings.use_trim_symbols
)
self.glyphs = [glyph for glyph in rendered_text.iterdescendants(SVG_GROUP_TAG) if glyph.label and len(glyph.label) == 1]
def get_start_position(self):
start_position = 0
text_length = self.text_length()
path_length = self.path.length
if self.text_position == 'center':
start_position = (path_length - text_length) / 2
if self.text_position == 'right':
start_position = path_length - text_length
return start_position
def get_position_and_stretch_values(self):
text_bbox = self.glyphs[0].getparent().bounding_box()
text_baseline = text_bbox.bottom
if self.text_position == 'stretch':
text_content = self.settings.text
space_indices = [i for i, t in enumerate(text_content) if t == " "]
text_bbox = self.text.bounding_box()
text_width = convert_unit(text_bbox.width, 'px', self.svg.unit)
if len(text_content) - 1 != 0:
path_length = self.path.length
stretch_space = (path_length - text_width) / (len(text_content) - 1)
else:
stretch_space = 0
else:
stretch_space = 0
space_indices = []
return space_indices, stretch_space, text_baseline
def text_length(self):
return convert_unit(self.text.bounding_box().width, 'px', self.svg.unit)
def hide_commands(self):
# hide commmands for bounding box calculation
hidden_commands = []
for glyph in self.glyphs:
for group in glyph.iterdescendants(SVG_GROUP_TAG):
if group.get_id().startswith("command_group") and group.style('display', 'inline') != 'none':
hidden_commands.append(group)
group.style['display'] = 'none'
return hidden_commands
def restore_commands(self, hidden_commands):
for command in hidden_commands:
command.style['display'] = "inline"
def transform_glyphs(self, start_position, stretch_space, space_indices, text_baseline):
text_scale = Transform(f'scale({self.settings.scale / 100})')
distance = start_position
old_bbox = None
i = 0
for glyph in self.glyphs:
# dimensions
bbox = glyph.bounding_box()
transformed_bbox = glyph.bounding_box(glyph.getparent().composed_transform())
left = bbox.left
transformed_left = transformed_bbox.left
width = convert_unit(transformed_bbox.width, 'px', self.svg.unit)
# adjust position
if old_bbox:
distance += convert_unit(transformed_left - old_bbox.right, 'px', self.svg.unit) + stretch_space
if self.text_position == 'stretch' and i in space_indices:
distance += stretch_space
i += 1
new_distance = distance + width
# calculate and apply transform
first = self.path.interpolate(distance)
last = self.path.interpolate(new_distance)
angle = degrees(atan2(last.y - first.y, last.x - first.x)) % 360
translate = InkstitchPoint(first.x, first.y) - InkstitchPoint(left, text_baseline)
transform = Transform(f"rotate({angle}, {first.x}, {first.y}) translate({translate.x} {translate.y})")
correction_transform = Transform(get_correction_transform(glyph))
glyph.transform = correction_transform @ transform @ glyph.transform @ text_scale
# set values for next iteration
distance = new_distance
old_bbox = transformed_bbox
i += 1
def load_settings(self):
"""Load the settings saved into the text element"""
self.settings = DotDict({
"text": "",
"back_and_forth": False,
"font": None,
"scale": 100,
"trim_option": 0,
"use_trim_symbols": False
})
if INKSTITCH_LETTERING in self.text.attrib:
try:
self.settings.update(json.loads(self.text.get(INKSTITCH_LETTERING)))
except (TypeError, ValueError):
pass
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