Bounding box dim

[alvis]

I would like some help. There is a mistake in my code. I would like the Z axis dimension of the bounding box to be on the back left side.

# add_dimensions.rb

# Ensure we are running this within the SketchUp environment
if !defined?(Sketchup)
  raise "This script must be run within SketchUp."
end

module AddDimensionsPlugin
  extend self

  def add_dimensions
    # Check if there is an active model
    model = Sketchup.active_model
    if model.nil?
      raise "No active model found."
    end

    # Check if there is a selection
    selection = model.selection
    if selection.empty?
      raise "No selection found. Please select a component."
    end

    # Ensure the selection is a component instance
    component_instance = selection.first
    unless component_instance.is_a?(Sketchup::ComponentInstance)
      raise "Selected entity is not a component instance."
    end

    # Start an operation to allow for a single undo
    model.start_operation('Add Dimensions', true)

    begin
      # Get the component's bounding box
      bounding_box = component_instance.bounds

      # Define the length of the dimension arrow
      arrow_length = 10.cm

      # Create a method to add dimensions
      def add_dimension(entities, start_point, end_point, offset_vector)
        dim = entities.add_dimension_linear(start_point, end_point, offset_vector)
        dim.material = "black"
        dim
      end

      # Get the transformation of the component instance
      transformation = component_instance.transformation

      # Transform bounding box points to the component's local coordinates
      points = {
        x_min: bounding_box.corner(0).transform(transformation.inverse),
        x_max: bounding_box.corner(1).transform(transformation.inverse),
        y_min: bounding_box.corner(0).transform(transformation.inverse),
        y_max: bounding_box.corner(3).transform(transformation.inverse),
        z_min: bounding_box.corner(0).transform(transformation.inverse),
        z_max: bounding_box.corner(4).transform(transformation.inverse)
      }

      # Enter the component editing context
      model.active_entities.add_group(component_instance).explode
      component_definition = component_instance.definition
      entities = component_definition.entities

      # Create dimensions along X axis
      start_point = points[:x_min]
      end_point = points[:x_max]
      offset_vector = [0, -arrow_length, 0]
      add_dimension(entities, start_point, end_point, offset_vector)

      # Create dimensions along Y axis
      start_point = points[:y_min]
      end_point = points[:y_max]
      offset_vector = [-arrow_length, 0, 0]
      add_dimension(entities, start_point, end_point, offset_vector)

      # Create dimensions along Z axis with a larger offset
      start_point = points[:z_min]
      end_point = points[:z_max]
      offset_vector = [0, -arrow_length, 0]
      add_dimension(entities, start_point, end_point, offset_vector)

      # Commit the operation
      model.commit_operation
      # Notify the user that dimensions have been added
      UI.messagebox("Dimensions added inside the selected component.")
    rescue Exception => e
      # Abort the operation in case of an error
      model.abort_operation
      # Show an error message
      UI.messagebox("An error occurred: #{e.message}")
    end
  end

  unless file_loaded?(__FILE__)
    UI.menu('Plugins').add_item('Add Dimensions to Component') {
      add_dimensions
    }
    file_loaded(__FILE__)
  end
end

[TIG]

@alvis

If you set z_min and z_max to the correct points it'll work.
Currently you are specifying them wrongly,
to the bb's 0 corner [z min] and 4 corner [z max]
Instead do something like this to set them to the y_max point
z_min: bounding_box.corner(3).transform(transformation.inverse)
and the corner point above it
z_max: bounding_box.corner(7).transform(transformation.inverse)