Regenerate missing sheets #4462

BlenderBIM will regenerate missing SVG drawings from the IFC on demand,
now it attempts to regenerate missing SVG sheets too. ie. you can open a
bare IFC file with configured drawings and sheets and continue working.

Only drawings are recognised, spreadsheet and other SVG refs are not
regenerated, all drawings are placed at the 30,30 pixel location.

src/blenderbim/blenderbim/bim/module/drawing/operator.py

@@ -2373,6 +2373,7 @@ class LoadSheets(bpy.types.Operator, Operator):
             if not filepath.is_file():
                 sheet_name = f"{sheet_prop.identification} - {sheet_prop.name}"
                 sheets_not_found.append(f'"{sheet_name}" - {document_uri}')
+                core.regenerate_sheet(tool.Drawing, sheet)
 
         if sheets_not_found:
             self.report({"ERROR"}, "Some sheets svg files are missing:\n" + "\n".join(sheets_not_found))

src/blenderbim/blenderbim/bim/module/drawing/svgwriter.py

@@ -93,7 +93,7 @@ class SvgWriter:
 
     def setup_drawing_resource_paths(self, element):
         pset = ifcopenshell.util.element.get_pset(element, "EPset_Drawing")
-        for resource in ("Stylesheet", "Markers", "Symbols", "Patterns"):
+        for resource in ("Stylesheet", "Markers", "Symbols", "Patterns", "ShadingStyles"):
             resource_path = pset.get(resource)
             if not resource_path:
                 self.resource_paths[resource] = None

src/blenderbim/blenderbim/core/drawing.py

@@ -16,6 +16,8 @@
 # You should have received a copy of the GNU General Public License
 # along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
 
+from pathlib import Path
+
 
 def enable_editing_text(drawing, obj=None):
     drawing.enable_editing_text(obj)
@@ -89,6 +91,12 @@ def add_sheet(ifc, drawing, titleblock=None):
     drawing.import_sheets()
 
 
+def regenerate_sheet(drawing, sheet=None):
+    titleblock_uri = drawing.get_document_uri(sheet, "TITLEBLOCK")
+    drawing.create_svg_sheet(sheet, drawing.sanitise_filename(Path(titleblock_uri).stem))
+    drawing.add_drawings(sheet)
+
+
 def open_sheet(drawing, sheet=None):
     drawing.open_layout_svg(drawing.get_document_uri(sheet, "LAYOUT"))
 

src/blenderbim/blenderbim/tool/drawing.py

@@ -247,6 +247,21 @@ class Drawing(blenderbim.core.tool.Drawing):
         sheet_builder.create(uri, titleblock)
         return uri
 
+    @classmethod
+    def add_drawings(cls, sheet):
+        sheet_builder = sheeter.SheetBuilder()
+        sheet_builder.data_dir = bpy.context.scene.BIMProperties.data_dir
+        sheet_reference = None
+        drawing_names = []
+        for reference in cls.get_document_references(sheet):
+            if reference.Description == "LAYOUT":
+                sheet_reference = reference
+            elif reference.Description == "DRAWING":
+                drawing_names.append(Path(reference.Location).stem)
+        for annotation in [e for e in tool.Ifc.get().by_type("IfcAnnotation") if e.ObjectType == "DRAWING"]:
+            if annotation.Name in drawing_names:
+                sheet_builder.add_drawing(sheet_reference, annotation, sheet)
+
     @classmethod
     def delete_collection(cls, collection):
         bpy.data.collections.remove(collection, do_unlink=True)