06_changing_and_creating.ipynb

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   "source": [
    "# Changing object values\n",
    "IfcOpenShell is not only good for reading out existing information. It also lets you manipulate information and save the changes to a file. Here is a script that overwrites all properties in a selected object with random gibberish"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import ifcopenshell\n",
    "m = ifcopenshell.open(\"../data/hello_reiff_2021.ifc\")\n",
    "from utils.JupyterIFCRenderer import JupyterIFCRenderer\n",
    "viewer = JupyterIFCRenderer(m, size=(400,300))\n",
    "viewer"
   ]
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  {
   "cell_type": "code",
   "execution_count": null,
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    "selection = viewer.getSelectedProduct()\n",
    "if selection:\n",
    "    #get the IfcProduct that is stored in the global variable 'selection'\n",
    "    obj = selection\n",
    "    for relDefinesByProperties in obj.IsDefinedBy:\n",
    "         print(\"[{0}]\".format(relDefinesByProperties.RelatingPropertyDefinition.Name))\n",
    "         for prop in relDefinesByProperties.RelatingPropertyDefinition.HasProperties:\n",
    "             print (\"{:<20} :{} \".format(prop.Name,prop.NominalValue.wrappedValue))\n",
    "             if type(prop.NominalValue.wrappedValue) == str:\n",
    "                 prop.NominalValue.wrappedValue = \"Foo Bar\"\n",
    "             if type(prop.NominalValue.wrappedValue) == float:\n",
    "                 prop.NominalValue.wrappedValue = 42\n",
    "             if type(prop.NominalValue.wrappedValue) == bool:\n",
    "                 prop.NominalValue.wrappedValue = False\n",
    "# Be careful not to overwrite your original file!             \n",
    "m.write(r'./changed-properties.ifc')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## creating information\n",
    "New information can be generated by using the `model.create...` functions that can be called for any entity instance you would like to add to your model.\n",
    "Here is a simple example how to add custom properties in a custom property set to the object currently selected in the viewer"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
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    "if selection:\n",
    "    product = selection\n",
    "    prop_set_guid = ifcopenshell.guid.compress(uuid.uuid1().hex)\n",
    "    property_values = [\n",
    "    m.createIfcPropertySingleValue(\"My own property\", \"Description of My Own Property\", m.create_entity(\"IfcText\", \"some textual Value\"), None),\n",
    "    m.createIfcPropertySingleValue(\"isMadeUp\", \"whether or not this is a made up valeue\", m.create_entity(\"IfcBoolean\", True), None),\n",
    "    ]\n",
    "    property_set = m.createIfcPropertySet(prop_set_guid, product.OwnerHistory, \"MyOwnPropSet\", None, property_values)\n",
    "    rel_guid = ifcopenshell.guid.compress(uuid.uuid1().hex)\n",
    "    m.createIfcRelDefinesByProperties(rel_guid, product.OwnerHistory, None, None, [product], property_set)\n",
    "\n",
    "m.write(r'./added_properties_added.ifc') "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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