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import decimal
from decimal import Decimal
from typing import List, Optional, Type, Union, overload
from typing_extensions import Literal
import qrcode.image.base
from qrcode.compat.etree import ET
from qrcode.image.styles.moduledrawers import svg as svg_drawers
from qrcode.image.styles.moduledrawers.base import QRModuleDrawer
class SvgFragmentImage(qrcode.image.base.BaseImageWithDrawer):
"""
SVG image builder
Creates a QR-code image as a SVG document fragment.
"""
_SVG_namespace = "http://www.w3.org/2000/svg"
kind = "SVG"
allowed_kinds = ("SVG",)
default_drawer_class: Type[QRModuleDrawer] = svg_drawers.SvgSquareDrawer
def __init__(self, *args, **kwargs):
ET.register_namespace("svg", self._SVG_namespace)
super().__init__(*args, **kwargs)
# Save the unit size, for example the default box_size of 10 is '1mm'.
self.unit_size = self.units(self.box_size)
@overload
def units(self, pixels: Union[int, Decimal], text: Literal[False]) -> Decimal:
...
@overload
def units(self, pixels: Union[int, Decimal], text: Literal[True] = True) -> str:
...
def units(self, pixels, text=True):
"""
A box_size of 10 (default) equals 1mm.
"""
units = Decimal(pixels) / 10
if not text:
return units
units = units.quantize(Decimal("0.001"))
context = decimal.Context(traps=[decimal.Inexact])
try:
for d in (Decimal("0.01"), Decimal("0.1"), Decimal("0")):
units = units.quantize(d, context=context)
except decimal.Inexact:
pass
return f"{units}mm"
def save(self, stream, kind=None):
self.check_kind(kind=kind)
self._write(stream)
def to_string(self, **kwargs):
return ET.tostring(self._img, **kwargs)
def new_image(self, **kwargs):
return self._svg(**kwargs)
def _svg(self, tag=None, version="1.1", **kwargs):
if tag is None:
tag = ET.QName(self._SVG_namespace, "svg")
dimension = self.units(self.pixel_size)
return ET.Element(
tag, # type: ignore
width=dimension,
height=dimension,
version=version,
**kwargs,
)
def _write(self, stream):
ET.ElementTree(self._img).write(stream, xml_declaration=False)
class SvgImage(SvgFragmentImage):
"""
Standalone SVG image builder
Creates a QR-code image as a standalone SVG document.
"""
background: Optional[str] = None
drawer_aliases: qrcode.image.base.DrawerAliases = {
"circle": (svg_drawers.SvgCircleDrawer, {}),
"gapped-circle": (svg_drawers.SvgCircleDrawer, {"size_ratio": Decimal(0.8)}),
"gapped-square": (svg_drawers.SvgSquareDrawer, {"size_ratio": Decimal(0.8)}),
}
def _svg(self, tag="svg", **kwargs):
svg = super()._svg(tag=tag, **kwargs)
svg.set("xmlns", self._SVG_namespace)
if self.background:
svg.append(
ET.Element(
"rect",
fill=self.background,
x="0",
y="0",
width="100%",
height="100%",
)
)
return svg
def _write(self, stream):
ET.ElementTree(self._img).write(stream, encoding="UTF-8", xml_declaration=True)
class SvgPathImage(SvgImage):
"""
SVG image builder with one single <path> element (removes white spaces
between individual QR points).
"""
QR_PATH_STYLE = {
"fill": "#000000",
"fill-opacity": "1",
"fill-rule": "nonzero",
"stroke": "none",
}
needs_processing = True
path: Optional[ET.Element] = None
default_drawer_class: Type[QRModuleDrawer] = svg_drawers.SvgPathSquareDrawer
drawer_aliases = {
"circle": (svg_drawers.SvgPathCircleDrawer, {}),
"gapped-circle": (
svg_drawers.SvgPathCircleDrawer,
{"size_ratio": Decimal(0.8)},
),
"gapped-square": (
svg_drawers.SvgPathSquareDrawer,
{"size_ratio": Decimal(0.8)},
),
}
def __init__(self, *args, **kwargs):
self._subpaths: List[str] = []
super().__init__(*args, **kwargs)
def _svg(self, viewBox=None, **kwargs):
if viewBox is None:
dimension = self.units(self.pixel_size, text=False)
viewBox = "0 0 {d} {d}".format(d=dimension)
return super()._svg(viewBox=viewBox, **kwargs)
def process(self):
# Store the path just in case someone wants to use it again or in some
# unique way.
self.path = ET.Element(
ET.QName("path"), # type: ignore
d="".join(self._subpaths),
id="qr-path",
**self.QR_PATH_STYLE,
)
self._subpaths = []
self._img.append(self.path)
class SvgFillImage(SvgImage):
"""
An SvgImage that fills the background to white.
"""
background = "white"
class SvgPathFillImage(SvgPathImage):
"""
An SvgPathImage that fills the background to white.
"""
background = "white"