Fix #2955. Drawings can now set a precision.

src/blenderbim/blenderbim/bim/data/pset/EPset_Drawing.ifc

@@ -5,7 +5,7 @@ FILE_NAME('EPset_Drawing.ifc','2020-01-01T00:00:00',(),(),'EPset_Drawing','EPset
 FILE_SCHEMA(('IFC4'));
 ENDSEC;
 DATA;
-#1=IFCPROPERTYSETTEMPLATE('2JhNIvqZrFnAgxfhK0XVQX',$,'EPset_Drawing','',.PSET_OCCURRENCEDRIVEN.,'IfcAnnotation',(#2,#3,#4,#5,#6,#7,#8,#9,#10,#11,#12,#13,#14,#15));
+#1=IFCPROPERTYSETTEMPLATE('2JhNIvqZrFnAgxfhK0XVQX',$,'EPset_Drawing','',.PSET_OCCURRENCEDRIVEN.,'IfcAnnotation',(#2,#3,#4,#5,#6,#7,#8,#9,#10,#11,#12,#13,#14,#15,#16,#17));
 #2=IFCSIMPLEPROPERTYTEMPLATE('23JavTMk98ZxXhrUEnjAcf',$,'TargetView','',.P_SINGLEVALUE.,'IfcLabel',$,$,$,$,$,.READWRITE.);
 #3=IFCSIMPLEPROPERTYTEMPLATE('1yVWUt5H9DAOuu0OaMMLpe',$,'Scale','',.P_SINGLEVALUE.,'IfcLabel',$,$,$,$,$,.READWRITE.);
 #4=IFCSIMPLEPROPERTYTEMPLATE('3gsuPBtU93b8f0gg1pjkq6',$,'HumanScale','',.P_SINGLEVALUE.,'IfcLabel',$,$,$,$,$,.READWRITE.);
@@ -20,5 +20,7 @@ DATA;
 #13=IFCSIMPLEPROPERTYTEMPLATE('3mRF52q81FQB$h4oTh7M45',$,'Markers','',.P_SINGLEVALUE.,'IfcURIReference',$,$,$,$,$,.READWRITE.);
 #14=IFCSIMPLEPROPERTYTEMPLATE('1rhr_0N3LDtuORcEJP0KXM',$,'Symbols','',.P_SINGLEVALUE.,'IfcURIReference',$,$,$,$,$,.READWRITE.);
 #15=IFCSIMPLEPROPERTYTEMPLATE('2sHDBuW7P4TROy$hL2w7ct',$,'Patterns','',.P_SINGLEVALUE.,'IfcURIReference',$,$,$,$,$,.READWRITE.);
+#16=IFCSIMPLEPROPERTYTEMPLATE('1$xfo9EVb26QLqmPll2_RK',$,'MetricPrecision','',.P_SINGLEVALUE.,'IfcReal',$,$,$,$,$,.READWRITE.);
+#17=IFCSIMPLEPROPERTYTEMPLATE('38uAtrp9nD_901NO42zd$7',$,'ImperialPrecision','',.P_SINGLEVALUE.,'IfcLabel',$,$,$,$,$,.READWRITE.);
 ENDSEC;
 END-ISO-10303-21;

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

@@ -120,9 +120,7 @@ class BoundingBox:
 
 # This function stolen from https://github.com/kevancress/MeasureIt_ARCH/blob/dcf607ce0896aa2284463c6b4ae9cd023fc54cbe/measureit_arch_baseclass.py
 # MeasureIt-ARCH is GPL-v3
-# In the future I will need to rewrite this to allow the user to have custom
+def format_distance(value, isArea=False, hide_units=True, precision=None):
-# settings for each annotation object, not read from Blender.
-def format_distance(value, isArea=False, hide_units=True):
     s_code = "\u00b2"  # Superscript two THIS IS LEGACY (but being kept for when Area Measurements are re-implimented)
 
     # Get Scene Unit Settings
@@ -141,8 +139,7 @@ def format_distance(value, isArea=False, hide_units=True):
 
     # Imperial Formatting
     if unit_system == "IMPERIAL":
-        precision = bpy.context.scene.BIMProperties.imperial_precision
+        if not precision:
-        if precision == "NONE":
             precision = 256
         elif precision == "1":
             precision = 1
@@ -204,8 +201,7 @@ def format_distance(value, isArea=False, hide_units=True):
 
     # METRIC FORMATTING
     elif unit_system == "METRIC":
-        precision = bpy.context.scene.BIMProperties.metric_precision
+        if precision:
-        if precision != 0:
             value = precision * round(float(value) / precision)
 
         # Meters

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

@@ -610,8 +610,11 @@ class CreateDrawing(bpy.types.Operator):
 
         annotations = sorted(elements, key=lambda a: tool.Drawing.get_annotation_z_index(a))
 
+        precision = ifcopenshell.util.element.get_pset(self.camera_element, "EPset_Drawing", "MetricPrecision")
+        if not precision:
+            precision = ifcopenshell.util.element.get_pset(self.camera_element, "EPset_Drawing", "ImperialPrecision")
         self.svg_writer.metadata = tool.Drawing.get_drawing_metadata(self.camera_element)
-        self.svg_writer.create_blank_svg(svg_path).draw_annotations(annotations).save()
+        self.svg_writer.create_blank_svg(svg_path).draw_annotations(annotations, precision).save()
 
         return svg_path
 

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

@@ -155,7 +155,8 @@ class SvgWriter:
         for child in root:
             self.svg.defs.add(External(child))
 
-    def draw_annotations(self, annotations):
+    def draw_annotations(self, annotations, precision):
+        self.precision = precision
         for element in annotations:
             obj = tool.Ifc.get_object(element)
             if not obj or element.ObjectType == "DRAWING":
@@ -225,7 +226,7 @@ class SvgWriter:
             # TODO: allow metric to be configurable
             rl = (matrix_world @ points[0].co.xyz).z
             if bpy.context.scene.unit_settings.system == "IMPERIAL":
-                rl = helper.format_distance(rl)
+                rl = helper.format_distance(rl, precision=self.precision)
             else:
                 unit_scale = ifcopenshell.util.unit.calculate_unit_scale(tool.Ifc.get())
                 rl /= unit_scale
@@ -796,7 +797,7 @@ class SvgWriter:
             # TODO: allow metric to be configurable
             rl = (matrix_world @ points[0].co).z
             if bpy.context.scene.unit_settings.system == "IMPERIAL":
-                rl = helper.format_distance(rl)
+                rl = helper.format_distance(rl, precision=self.precision)
             else:
                 unit_scale = ifcopenshell.util.unit.calculate_unit_scale(tool.Ifc.get())
                 rl /= unit_scale
@@ -1005,7 +1006,7 @@ class SvgWriter:
             }
 
             radius = (points[-1].co - points[-2].co).length
-            radius = helper.format_distance(radius)
+            radius = helper.format_distance(radius, precision=self.precision)
             tag = element.Description or f"R{radius}"
 
             self.svg.add(self.svg.text(tag, insert=tuple(text_position), class_="RADIUS", **text_style))
@@ -1061,7 +1062,7 @@ class SvgWriter:
                 elif element.ObjectType == "SLOPE_FRACTION":
                     if angle == 90:
                         return "-"
-                    return f"{helper.format_distance(rise)} / {helper.format_distance(run)}"
+                    return f"{helper.format_distance(rise, precision=self.precision)} / {helper.format_distance(run, precision=self.precision)}"
                 elif element.ObjectType == "SLOPE_PERCENT":
                     if angle == 90:
                         return "-"
@@ -1137,7 +1138,7 @@ class SvgWriter:
         vector = end - start
         perpendicular = Vector((vector.y, -vector.x)).normalized()
         dimension = (v1_global - v0_global).length
-        dimension = helper.format_distance(dimension)
+        dimension = helper.format_distance(dimension, precision=self.precision)
         sheet_dimension = ((end * self.svg_scale) - (start * self.svg_scale)).length
         if sheet_dimension < 5:  # annotation can't fit
             # offset text to right of marker

src/blenderbim/blenderbim/bim/prop.py

@@ -372,22 +372,6 @@ class BIMProperties(PropertyGroup):
         ],
         name="IFC Volume Unit",
     )
-    metric_precision: FloatProperty(default=0, name="Drawing Metric Precision")
-    imperial_precision: EnumProperty(
-        items=[
-            ("NONE", "No rounding", ""),
-            ("1", 'Nearest 1"', ""),
-            ("1/2", 'Nearest 1/2"', ""),
-            ("1/4", 'Nearest 1/4"', ""),
-            ("1/8", 'Nearest 1/8"', ""),
-            ("1/16", 'Nearest 1/16"', ""),
-            ("1/32", 'Nearest 1/32"', ""),
-            ("1/64", 'Nearest 1/64"', ""),
-            ("1/128", 'Nearest 1/128"', ""),
-            ("1/256", 'Nearest 1/256"', ""),
-        ],
-        name="Drawing Imperial Precision",
-    )
 
 
 class IfcParameter(PropertyGroup):

src/blenderbim/blenderbim/bim/ui.py

@@ -213,11 +213,6 @@ def ifc_units(self, context):
     row.prop(props, "area_unit")
     row = layout.row()
     row.prop(props, "volume_unit")
-    row = layout.row()
-    if scene.unit_settings.system == "IMPERIAL":
-        row.prop(props, "imperial_precision")
-    else:
-        row.prop(props, "metric_precision")
 
 
 # Scene panel groups