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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
import sys
from math import atan2, degrees
from inkex import Boolean, Transform, errormsg
from shapely.ops import substring
from ..elements import Stroke
from ..i18n import _
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("-o", "--options", type=str, default=None, dest="page_1")
self.arg_parser.add_argument("-i", "--info", type=str, default=None, dest="page_2")
self.arg_parser.add_argument("-s", "--stretch-spaces", type=Boolean, default=False, dest="stretch_spaces")
def effect(self):
# we ignore everything but the first path/text
text, path = self.get_selection()
self.load_settings(text)
glyphs = [glyph for glyph in text.iterdescendants(SVG_GROUP_TAG) if len(glyph.label) == 1]
if not glyphs:
errormsg(_("The text doesn't contain any glyphs."))
sys.exit(1)
path = Stroke(path).as_multi_line_string().geoms[0]
path_length = path.length
# overall bounding box - get from direct glyph parent
text_bbox = glyphs[0].getparent().bounding_box()
text_y = text_bbox.bottom
if self.options.stretch_spaces:
text_content = self.settings["text"]
space_indices = [i for i, t in enumerate(text_content) if t == " "]
text_width = text_bbox.width
if len(text_content) - 1 != 0:
stretch_space = (path_length - text_width) / (len(text_content) - 1)
else:
stretch_space = 0
else:
stretch_space = 0
space_indices = []
self.transform_glyphs(glyphs, path, stretch_space, space_indices, text_y)
def transform_glyphs(self, glyphs, path, stretch_space, space_indices, text_y):
text_scale = Transform(f'scale({self.settings["scale"] / 100})')
distance = 0
old_bbox = None
i = 0
for glyph in glyphs:
# dimensions
bbox = glyph.bounding_box()
left = bbox.left
width = bbox.width
# adjust position
if old_bbox:
right = old_bbox.right
distance += left - right + stretch_space
if self.options.stretch_spaces and i in space_indices:
distance += stretch_space
i += 1
new_distance = distance + width
# calculate and apply transform
first = substring(path, distance, distance)
last = substring(path, new_distance, new_distance)
angle = degrees(atan2(last.y - first.y, last.x - first.x)) % 360
translate = InkstitchPoint(first.x, first.y) - InkstitchPoint(left, text_y)
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 = bbox
i += 1
def load_settings(self, text):
"""Load the settings saved into the text element"""
self.settings = DotDict({
"text": "",
"back_and_forth": False,
"font": None,
"scale": 100,
"trim_option": 0
})
if INKSTITCH_LETTERING in text.attrib:
try:
self.settings.update(json.loads(text.get(INKSTITCH_LETTERING)))
except (TypeError, ValueError):
pass
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:
errormsg(_("Please select one path and one Ink/Stitch lettering group."))
sys.exit(1)
return [groups[0], paths[0]]
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