qtpy can be optional

svgdatagrabber/geometry/geometrybase.py

@@ -3,14 +3,13 @@
 import sys
 from abc import ABC
 from enum import IntEnum
-from typing import Tuple
-
-from qtpy.QtCore import Qt
-from qtpy.QtGui import QPen
-from qtpy.QtWidgets import QApplication, QGraphicsScene
+from typing import TYPE_CHECKING, Tuple
 
 from ..graphics.annotations import QBrushType, QGraphicsItemType, QPenType
 
+if TYPE_CHECKING:
+    from qtpy.QtWidgets import QGraphicsScene
+
 
 class GeometryDrawAs(IntEnum):
     """Geometry draw as enum."""
@@ -58,7 +57,7 @@ def drawArgs(self) -> Tuple[str, tuple]:
 
     def draw(
         self,
-        scene: QGraphicsScene,
+        scene: "QGraphicsScene",
         pen: QPenType = None,
         brush: QBrushType = None,
         item: QGraphicsItemType = None,
@@ -71,6 +70,8 @@ def draw(
             brush: The brush to draw with.
             item: The old item to draw on, if any.
         """
+        from qtpy.QtGui import QPen
+
         args = self.drawArgs
         if self.drawAs == DrawAsLine:
             item and item.setLine(*args) or item or (item := scene.addLine(*args))
@@ -94,6 +95,9 @@ def plot(self, pen: QPenType = None, brush: QBrushType = None, fit: bool = True)
             brush: The brush to draw with.
             fit: Fit the view to the geometry.
         """
+        from qtpy.QtCore import Qt
+        from qtpy.QtWidgets import QApplication
+
         from ..graphics.graphicsview import GraphicsView
 
         app = QApplication(sys.argv)

svgdatagrabber/geometry/point.py

@@ -1,12 +1,14 @@
 from __future__ import annotations
 
-from typing import Iterable, Tuple, Union
+from typing import TYPE_CHECKING, Iterable, Tuple, Union
 
 import numpy as np
-from qtpy.QtCore import QLineF
 
 from .geometrybase import DrawAsEllipse, GeometryBase
 
+if TYPE_CHECKING:
+    from qtpy.QtCore import QLineF
+
 PointType = Union["Point", Iterable[float], complex]
 
 
@@ -312,6 +314,8 @@ def asvector(cls, v: "Vector" | PointType) -> "Vector":
         return cls.aspoint(v)
 
     @property
-    def drawArgs(self) -> QLineF:
+    def drawArgs(self) -> "QLineF":
         """Convert the vector to a Qt line."""
+        from qtpy.QtCore import QLineF
+
         return QLineF(0.0, 0.0, self.x, self.y)

svgdatagrabber/geometry/polygon.py

@@ -1,9 +1,7 @@
 from __future__ import annotations
 
-from typing import Iterable, List, Tuple
+from typing import TYPE_CHECKING, Iterable, List, Tuple
 
-from qtpy.QtCore import QPointF
-from qtpy.QtGui import QPolygonF
 from shapely.geometry import Polygon as ShapelyPolygon
 
 from .closedshape import ClosedShape
@@ -13,6 +11,9 @@
 from .sequence import PointSequence
 from .straightline import LineRay, LineSegment
 
+if TYPE_CHECKING:
+    from qtpy.QtGui import QPolygonF
+
 
 class Polygon(ClosedShape, PointSequence):
     """A class representing a polygon."""
@@ -244,6 +245,9 @@ def asShapely(self) -> ShapelyPolygon:
         return ShapelyPolygon(((vertex.x, vertex.y) for vertex in self.vertices))
 
     @property
-    def drawArgs(self) -> Tuple[QPolygonF]:
+    def drawArgs(self) -> Tuple["QPolygonF"]:
         """Return the polygon as a Qt polygon."""
+        from qtpy.QtCore import QPointF
+        from qtpy.QtGui import QPolygonF
+
         return (QPolygonF([QPointF(vertex.x, vertex.y) for vertex in self.vertices]),)

svgdatagrabber/geometry/straightline.py

@@ -1,15 +1,17 @@
 from __future__ import annotations
 
-from typing import Iterator
+from typing import TYPE_CHECKING, Iterator
 
 import numpy as np
-from qtpy.QtCore import QLineF
 from svgpathtools import Line as SvgPathToolsLine
 
 from .exceptions import NotDrawableGeometryError
 from .linebase import StraightLineBase
 from .point import Point, PointType, Vector
 
+if TYPE_CHECKING:
+    from qtpy.QtCore import QLineF
+
 
 class Line(StraightLineBase):
     """A class representing a line."""
@@ -739,8 +741,10 @@ def reverse(self) -> "LineSegment":
         return self
 
     @property
-    def drawArgs(self) -> QLineF:
+    def drawArgs(self) -> "QLineF":
         """Get the Qt representation of this line segment."""
+        from qtpy.QtCore import QLineF
+
         return QLineF(self.start.x, self.start.y, self.end.x, self.end.y)