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|
"""Some Gaphor specific updates to the canvas. This is done by setting the
correct properties on gaphas' modules.
Matrix
------
Small utility class wrapping cairo.Matrix. The `Matrix` class adds
state notification capabilities.
"""
from __future__ import annotations
from typing import Callable, SupportsFloat
import cairo
Matrixtuple = tuple[float, float, float, float, float, float]
class Matrix:
"""Matrix wrapper.
>>> Matrix()
Matrix(1.0, 0.0, 0.0, 1.0, 0.0, 0.0)
"""
def __init__(
self,
xx: float = 1.0,
yx: float = 0.0,
xy: float = 0.0,
yy: float = 1.0,
x0: float = 0.0,
y0: float = 0.0,
matrix: cairo.Matrix | None = None,
) -> None:
self._matrix = matrix or cairo.Matrix(xx, yx, xy, yy, x0, y0)
self._handlers: set[Callable[[Matrix, Matrixtuple], None]] = set()
def add_handler(
self,
handler: Callable[[Matrix, Matrixtuple], None],
) -> None:
self._handlers.add(handler)
def remove_handler(
self,
handler: Callable[[Matrix, Matrixtuple], None],
) -> None:
self._handlers.discard(handler)
def notify(self, old: Matrixtuple) -> None:
for handler in self._handlers:
handler(self, old)
def invert(self) -> None:
old: Matrixtuple = self.tuple()
self._matrix.invert()
self.notify(old)
def rotate(self, radians: float) -> None:
old: Matrixtuple = self.tuple()
self._matrix.rotate(radians)
self.notify(old)
def scale(self, sx: float, sy: float) -> None:
old = self.tuple()
self._matrix.scale(sx, sy)
self.notify(old)
def translate(self, tx: float, ty: float) -> None:
old: Matrixtuple = self.tuple()
self._matrix.translate(tx, ty)
self.notify(old)
def set(
self,
xx: float | None = None,
yx: float | None = None,
xy: float | None = None,
yy: float | None = None,
x0: float | None = None,
y0: float | None = None,
) -> None:
updated = False
m = self._matrix
old = self.tuple()
for name, val in (
("xx", xx),
("yx", yx),
("xy", xy),
("yy", yy),
("x0", x0),
("y0", y0),
):
if val is not None and val != getattr(m, name):
setattr(m, name, val)
updated = True
if updated:
self.notify(old)
def multiply(self, m: Matrix) -> Matrix:
return Matrix(matrix=self._matrix.multiply(m._matrix))
def transform_distance(
self, dx: SupportsFloat, dy: SupportsFloat
) -> tuple[float, float]:
return self._matrix.transform_distance(dx, dy) # type: ignore[no-any-return]
def transform_point(
self, x: SupportsFloat, y: SupportsFloat
) -> tuple[float, float]:
return self._matrix.transform_point(x, y) # type: ignore[no-any-return]
def inverse(self) -> Matrix:
m = Matrix(matrix=cairo.Matrix(*self._matrix))
m.invert()
return m
def tuple(self) -> Matrixtuple:
return tuple(self) # type: ignore[arg-type, return-value]
def to_cairo(self) -> cairo.Matrix:
return self._matrix
def __eq__(self, other: object) -> bool:
# sourcery skip: remove-unnecessary-cast
return (
bool(self._matrix == other._matrix) if isinstance(other, Matrix) else False
)
def __getitem__(self, val: int) -> float:
return self._matrix[val] # type: ignore[no-any-return]
def __mul__(self, other: Matrix) -> Matrix:
return Matrix(matrix=self._matrix * other._matrix)
def __imul__(self, other: Matrix) -> Matrix:
old: Matrixtuple = self.tuple()
self._matrix *= other._matrix
self.notify(old)
return self
def __repr__(self) -> str:
return f"Matrix{tuple(self._matrix)}"
|
