add exploration script render_viewport_modelspace_limits.py

Author: mozman

exploration/render_viewport_modelspace_limits.py

@@ -0,0 +1,54 @@
+#  Copyright (c) 2024, Manfred Moitzi
+#  License: MIT License
+from __future__ import annotations
+from typing import cast, TYPE_CHECKING
+from pathlib import Path
+import ezdxf
+from ezdxf import colors
+from ezdxf.gfxattribs import GfxAttribs
+from ezdxf.math import Vec2
+from ezdxf.entities import Viewport
+
+if TYPE_CHECKING:
+    from ezdxf.layouts import Modelspace
+
+CWD = Path("~/Desktop/Outbox").expanduser()
+if not CWD.exists():
+    CWD = Path(".")
+
+
+def render_viewport_modelspace_limits(vp: Viewport, msp: Modelspace, dxfattribs):
+    print(f"  {str(vp)}")
+    x0, y0, x1, y1 = vp.get_modelspace_limits()
+    vertices = Vec2(x0, y0), Vec2(x1, y0), Vec2(x1, y1), Vec2(x0, y1)
+    msp.add_lwpolyline(vertices, close=True, dxfattribs=dxfattribs)
+
+
+def main(filename: str) -> None:
+    print(f"loading DXF: {filename}")
+    doc = ezdxf.readfile(filename)
+    msp = doc.modelspace()
+
+    for num, name in enumerate(doc.layout_names_in_taborder()):
+        if name == "Model":
+            continue
+        print(f"processing layout: {name}")
+        layer_name = f"EZDXF_VP_BORDER_{num}"
+        doc.layers.add(layer_name, color=colors.MAGENTA)
+        dxfattribs = GfxAttribs(layer=layer_name)
+        psp = doc.layout(name)
+        for viewport in psp.query("VIEWPORT")[1:]:
+            # skip the first viewport - defines the paperspace representation in
+            # the CAD application
+            render_viewport_modelspace_limits(
+                cast(Viewport, viewport), msp, dxfattribs=dxfattribs
+            )
+
+    filename = CWD / "vp_limits.dxf"
+    print(f"saving DXF: {filename}")
+    doc.saveas(filename)
+    print("finish.")
+
+
+if __name__ == "__main__":
+    main(r"C:\Users\mozman\Desktop\Now\ezdxf\1298\problematic_viewports.dxf")