Option to scale symbol from ifc tag by scaling ifc text object #2946

Also added some text scaling in viewport if there is some symbol associated with text annotation to roughly visually indicate how big this thing is going to be in the svg.

Example - https://user-images.githubusercontent.com/9417531/235445393-447f3aba-8425-4da6-81d0-6bf9004fcf2b.mp4

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

@@ -228,9 +228,11 @@ class DecoratorData:
 
         props = obj.BIMTextProperties
         # getting font size
-        classes = ifcopenshell.util.element.get_pset(element, "EPset_Annotation", "Classes")
+        pset_data = ifcopenshell.util.element.get_pset(element, "EPset_Annotation") or {}
         # use `regular` as default
-        if classes:
+
+        # get font size
+        if classes := pset_data.get("Classes", None):
             classes_split = classes.split()
             # prioritize smaller font sizes just like in svg
             font_size_type = next(
@@ -240,6 +242,9 @@ class DecoratorData:
             font_size_type = "regular"
         font_size = FONT_SIZES[font_size_type]
 
+        # get symbol
+        symbol = pset_data.get("Symbol", None)
+
         # other attributes
         props_literals = props.literals
         props_literals_n = len(props.literals)
@@ -257,7 +262,7 @@ class DecoratorData:
 
             literals_data.append(literal_data)
 
-        text_data = {"Literals": literals_data, "FontSize": font_size}
+        text_data = {"Literals": literals_data, "FontSize": font_size, "Symbol": symbol}
         cls.data[obj.name] = text_data
         return text_data
 

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

@@ -437,12 +437,16 @@ class BaseDecorator:
         props = obj.BIMTextProperties
         text_data = props.get_text_edited_data() if props.is_editing else DecoratorData.get_ifc_text_data(obj)
         literals_data = text_data["Literals"]
+        symbol = text_data["Symbol"]
+        text_scale = 1.0
 
-        # draw asterisk symbol to visually indicate that there are multiple literals
-        if len(literals_data) > 1:
+        # draw asterisk symbol to indicate that there is some symbol that's not shown in viewport
+        if symbol:
             verts = [text_world_position]
             idxs = [(0, 0)]
             self.draw_lines(context, obj, verts, idxs)
+            # NOTE: for now we assume that scale is uniform
+            text_scale = obj.scale.x
 
         line_i = 0
         for literal_data in literals_data:
@@ -457,7 +461,7 @@ class BaseDecorator:
                     gap=0,
                     center=False,
                     vcenter=False,
-                    font_size_mm=text_data["FontSize"],
+                    font_size_mm=text_data["FontSize"] * text_scale,
                     line_no=line_i,
                     box_alignment=box_alignment,
                 )

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

@@ -686,7 +686,13 @@ class SvgWriter:
                 # if there is a symbol with template text fields
                 # then we just populate it's fields with the data from text literals
                 if template_text_fields:
-                    symbol_xml.attrib["transform"] = f"translate({', '.join(map(str, text_position_svg))}) rotate({angle})"
+                    # NOTE: for now we assume that scale is uniform
+                    symbol_transform = (
+                        f"translate({', '.join(map(str, text_position_svg))})"
+                        f" rotate({angle})"
+                        f" scale({text_obj.scale.x})"
+                    )
+                    symbol_xml.attrib["transform"] = symbol_transform
                     symbol_xml.attrib.pop("id")
                     # note: zip makes sure that we iterate over the shortest list
                     for field, text_literal in zip(template_text_fields, text_literals):
@@ -732,7 +738,6 @@ class SvgWriter:
                 add_text_tag(True)
             add_text_tag(False)
 
-
     def draw_break_annotations(self, obj):
         x_offset = self.raw_width / 2
         y_offset = self.raw_height / 2