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[svg] fix rotation in svg

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This commit is contained in:
Jan Petykiewicz 2026-03-30 20:24:24 -07:00
commit 06f8611a90
2 changed files with 86 additions and 1 deletions
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17
masque/file/svg.py
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@ -10,11 +10,26 @@ import svgwrite # type: ignore
from .utils import mangle_name
from .. import Pattern
from ..utils import rotation_matrix_2d
logger = logging.getLogger(__name__)
def _ref_to_svg_transform(ref) -> str:
linear = rotation_matrix_2d(ref.rotation) * ref.scale
if ref.mirrored:
linear = linear @ numpy.diag((1.0, -1.0))
a = linear[0, 0]
b = linear[1, 0]
c = linear[0, 1]
d = linear[1, 1]
e = ref.offset[0]
f = ref.offset[1]
return f'matrix({a:g} {b:g} {c:g} {d:g} {e:g} {f:g})'
def writefile(
library: Mapping[str, Pattern],
top: str,
@ -107,7 +122,7 @@ def writefile(
if target is None:
continue
for ref in refs:
transform = f'scale({ref.scale:g}) rotate({ref.rotation:g}) translate({ref.offset[0]:g},{ref.offset[1]:g})'
transform = _ref_to_svg_transform(ref)
use = svg.use(href='#' + mangle_name(target), transform=transform)
svg_group.add(use)