Render Part D Assignment
In this studio we will evolve our code from Render_Part_C_Assignment to leverage mixins.
Continue editing files in the render/assignment directory.
Background
Investigate Ruby Modules, specifically the module
and include
keywords.
Warning
Do NOT use the include
keyword in Ruby as you would typically in C or C++.
Be sure to include within the intended class or module definition.
If you include
at the top-level, it will mixin to Object
!
This may or may not rip a hole in the universe.
Code to Implement
Composite
file: | src/main/ruby/render/assignment/composite.rb | ![]() |
module: | Composite | |
methods: | initialize_components() push_component(component) each_component() calculate_local_bounds() |
module Composite should define methods initialize_components
, push_component
, and each_component
as well as mixin the Enumerable module.
initialize_components
add an instance variable with a suitable name to store an array of components
NOTE: initialize_components() must be private.
push_component
push a component onto your array instance variable.
each_component
if a block is given, yield for each component in your array instance variable.
otherwise use to_enum to return a new Enumerator of the components.
Note: be sure to invoke to_enum
with the symbol of the method :each_component
and not invoke the method by mistake.
calculate_local_bounds
Similar to the bounds calculations on CompositeTransform and Scene from Part C.
Mixin Enumerable
to add a number of useful methods, include the Enumerable module and
Alias each
use alias_method to alias an :each
method to the :each_component
method.
CompositeTransform
Be sure to add:
require_relative 'composite' |
![]() |
Mixin your Composite module to the CompositeTransform class.
include Composite
Be sure to invoke initialize_components
from the constructor and clean up existing code. For example bounds calculation can now use map.
Scene
Be sure to add:
require_relative 'composite' |
![]() |
Mixin your Composite module to the Scene class.
include Composite
Be sure to invoke initialize_components
from the constructor and clean up existing code. For example bounds calculation can now use map.
Testing Your Solution
Unit Test
Complete
file: | src/test/ruby/drawings/preliminary/part_d/*.rb | ![]() |
note: ensure that you have removed all printing to receive credit for any assignment.
Somewhat Outdated Testing Demo