Fix incorrect prediction of displaced bounding boxes (#110)

Resolves #105

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-  <img width="400" src="https://github.com/Argmaster/pygerber/assets/56170852/b7aeb3e1-cd59-4f5b-b078-c01272461367">
+   <img width="400" src="https://github.com/UniversityOfGdanskTeamPython/epseon_backend/assets/56170852/094eb29d-ad4d-420c-bf20-60eae2cadb0b" alt="" />
 </p>
 
 <h1 align="center"> PyGerber </h1>

src/pygerber/backend/abstract/aperture_handle.py

@@ -79,12 +79,18 @@ def get_bounding_box(self) -> BoundingBox:
 
     @cached_property
     def _bounding_box(self) -> BoundingBox:
-        bbox = BoundingBox.NULL
+        bbox: Optional[BoundingBox] = None
 
         for aperture_draw in self.aperture_draws:
-            bbox += aperture_draw.get_bounding_box()
+            if bbox is not None:
+                bbox += aperture_draw.get_bounding_box()
+            else:
+                bbox = aperture_draw.get_bounding_box()
 
-        return bbox
+        if bbox is not None:
+            return bbox
+
+        return BoundingBox.NULL
 
     def _get_coordinate_origin(self) -> Vector2D:
         return self.bounding_box.get_min_vector()

src/pygerber/backend/abstract/backend_cls.py

@@ -104,12 +104,18 @@ def finalize_aperture_creation(self) -> None:
             handle.finalize_aperture_creation()
 
     def _get_draws_bounding_box(self, draws: List[DrawCommand]) -> BoundingBox:
-        bbox = BoundingBox.NULL
+        bbox: Optional[BoundingBox] = None
 
         for draw in draws:
-            bbox += draw.get_bounding_box()
+            if bbox is not None:
+                bbox += draw.get_bounding_box()
+            else:
+                bbox = draw.get_bounding_box()
 
-        return bbox
+        if bbox is not None:
+            return bbox
+
+        return BoundingBox.NULL
 
     def _get_coordinate_origin(self) -> Vector2D:
         return self.bounding_box.get_min_vector()

src/pygerber/backend/abstract/draw_commands/draw_region.py

@@ -2,11 +2,11 @@
 from __future__ import annotations
 
 from functools import cached_property
+from typing import Optional
 
 from pygerber.backend.abstract.backend_cls import Backend
 from pygerber.backend.abstract.draw_commands.draw_command import DrawCommand
 from pygerber.gerberx3.math.bounding_box import BoundingBox
-from pygerber.gerberx3.math.offset import Offset
 from pygerber.gerberx3.math.vector_2d import Vector2D
 from pygerber.gerberx3.state_enums import Polarity
 
@@ -32,8 +32,14 @@ def get_bounding_box(self) -> BoundingBox:
 
     @cached_property
     def _bounding_box(self) -> BoundingBox:
-        box = BoundingBox.from_diameter(Offset.new(0.0))
+        box: Optional[BoundingBox] = None
         for point in self.region_boundary_points:
-            box = box.include_point(point)
+            if box is not None:
+                box = box.include_point(point)
+            else:
+                box = BoundingBox.NULL + point
 
-        return box
+        if box is not None:
+            return box
+
+        return BoundingBox.NULL