Protocols in typing

src/plopp/backends/matplotlib/tiled.py

@@ -8,7 +8,7 @@
 import numpy as np
 from matplotlib import gridspec
 
-from ..protocols import FigureLike
+from ...core.typing import FigureLike
 from .static import get_repr_maker
 from .utils import copy_figure, is_interactive_backend, make_figure
 
@@ -73,9 +73,11 @@ def __init__(
         self.nrows = nrows
         self.ncols = ncols
         self.fig = make_figure(
-            figsize=(min(6.0 * ncols, 15.0), min(4.0 * nrows, 15.0))
-            if figsize is None
-            else figsize,
+            figsize=(
+                (min(6.0 * ncols, 15.0), min(4.0 * nrows, 15.0))
+                if figsize is None
+                else figsize
+            ),
             layout='constrained',
         )
 

src/plopp/backends/matplotlib/utils.py

@@ -7,7 +7,7 @@
 import matplotlib as mpl
 from matplotlib.pyplot import Figure, _get_backend_mod
 
-from ..protocols import FigureLike
+from ...core.typing import FigureLike
 
 
 def fig_to_bytes(fig: Figure, form: Literal['png', 'svg'] = 'png') -> bytes:

src/plopp/core/typing.py

@@ -1,8 +1,11 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright (c) 2023 Scipp contributors (https://github.com/scipp)
 
-from typing import Dict, Union
+from __future__ import annotations
 
+from typing import Dict, Protocol, Tuple, Union
+
+import scipp as sc
 from numpy import ndarray
 from scipp.typing import VariableLike
 
@@ -23,8 +26,156 @@ class VisibleDeprecationWarning(UserWarning):
 
 PlottableMulti = Union[Plottable, Dict[str, Plottable]]
 
+
+class CanvasLike(Protocol):
+    def autoscale(self) -> None:
+        ...
+
+    def draw(self) -> None:
+        ...
+
+    def save(self) -> None:
+        ...
+
+    @property
+    def empty(self) -> bool:
+        ...
+
+    @property
+    def title(self) -> str:
+        ...
+
+    @title.setter
+    def title(self, title: str) -> None:
+        ...
+
+    @property
+    def xlabel(self) -> str:
+        ...
+
+    @xlabel.setter
+    def xlabel(self, xlabel: str) -> None:
+        ...
+
+    @property
+    def ylabel(self) -> str:
+        ...
+
+    @ylabel.setter
+    def ylabel(self, ylabel: str) -> None:
+        ...
+
+    @property
+    def xscale(self) -> str:
+        ...
+
+    @xscale.setter
+    def xscale(self, xscale: str) -> None:
+        ...
+
+    @property
+    def yscale(self) -> str:
+        ...
+
+    @yscale.setter
+    def yscale(self, yscale: str) -> None:
+        ...
+
+    @property
+    def xmin(self) -> float:
+        ...
+
+    @xmin.setter
+    def xmin(self, xmin: float) -> None:
+        ...
+
+    @property
+    def xmax(self) -> float:
+        ...
+
+    @xmax.setter
+    def xmax(self, xmax: float) -> None:
+        ...
+
+    @property
+    def ymin(self) -> float:
+        ...
+
+    @ymin.setter
+    def ymin(self, ymin: float) -> None:
+        ...
+
+    @property
+    def ymax(self) -> float:
+        ...
+
+    @ymax.setter
+    def ymax(self, ymax: float) -> None:
+        ...
+
+    @property
+    def xrange(self) -> Tuple[float, float]:
+        ...
+
+    @xrange.setter
+    def xrange(self, xrange: Tuple[float, float]) -> None:
+        ...
+
+    @property
+    def yrange(self) -> Tuple[float, float]:
+        ...
+
+    @yrange.setter
+    def yrange(self, yrange: Tuple[float, float]) -> None:
+        ...
+
+    def logx(self) -> None:
+        ...
+
+    def logy(self) -> None:
+        ...
+
+
+class ArtistLike(Protocol):
+    def update(self, new_values: sc.DataArray) -> None:
+        ...
+
+
+class FigureLike(Protocol):
+    @property
+    def canvas(self) -> CanvasLike:
+        ...
+
+    @property
+    def artists(self) -> Dict[str, ArtistLike]:
+        ...
+
+    @property
+    def graph_nodes(self) -> Dict[str, Node]:
+        ...
+
+    @property
+    def id(self) -> str:
+        ...
+
+    def save(self, filename: str, **kwargs) -> None:
+        ...
+
+    def update(self, *args, **kwargs) -> None:
+        ...
+
+    def notify_view(self, *args, **kwargs) -> None:
+        ...
+
+    def copy(self, **kwargs) -> FigureLike:
+        ...
+
+
 __all__ = [
+    'VisibleDeprecationWarning',
     'Plottable',
     'PlottableMulti',
-    'VisibleDeprecationWarning',
+    'CanvasLike',
+    'ArtistLike',
+    'FigureLike',
 ]

src/plopp/graphics/imageview.py

@@ -6,6 +6,7 @@
 import scipp as sc
 
 from .. import backends
+from ..core.typing import FigureLike
 from .colormapper import ColorMapper
 from .graphicalview import GraphicalView
 
@@ -114,7 +115,7 @@ def make_artist(self, new_values):
         return backends.image(canvas=self.canvas, data=new_values, **self._kwargs)
 
 
-def imagefigure(*args, **kwargs):
+def imagefigure(*args, **kwargs) -> FigureLike:
     """
     Create a figure to represent two-dimensional data from one or more graph node(s).
 

src/plopp/graphics/lineview.py

@@ -6,6 +6,7 @@
 import scipp as sc
 
 from .. import backends
+from ..core.typing import FigureLike
 from .graphicalview import GraphicalView
 
 
@@ -117,7 +118,7 @@ def make_artist(self, new_values):
         )
 
 
-def linefigure(*args, **kwargs):
+def linefigure(*args, **kwargs) -> FigureLike:
     """
     Create a figure to represent one-dimensional data from one or more graph node(s).