Render Part B Assignment

In this studio we will evolve our code from Render_Part_A_Assignment to leverage class hierarchies.

Note: CircularSegment is referred to as Chord in the image below.

Continue editing files in the render/assignment directory.

In this studio, we will have parameters for which explicitly passed arguments are not required (for convenience and backwards compatibility). We will prefer keyword arguments over optional arguments.

Code to Implement

Transform

file:	src/main/ruby/render/assignment/transform.rb
class:	Transform
superclass:	Object
methods:	initialize(x,y) render()

Transform's constructor should take x and y parameters and store them in instance variables.

It should define a render method which preserves the current model view transformation, translates in the z==0 plane, passes the render_transformed message to itself (a.k.a. invokes a method on itself), and restores the model view transformation.

All subclasses must implement a private render_transformed method.

Image

file:	src/main/ruby/render/assignment/image.rb
class:	Image
superclass:	Transform
methods to evolve:	initialize(path, x: 0, y: 0)
methods to add:	render_transformed()
methods to remove:	render()

You will evolve your code from from Part A

be sure to add the following line above your class:

require_relative 'transform'

Add keyword parameters for x: 0 and y: 0 and invoke your superclass with these parameters.

NOTE: Be sure to not override render. Implement the render_transformed method instead.

NOTE: render_transformed() must be private.

ColorTransform

file:	src/main/ruby/render/assignment/color_transform.rb
class:	ColorTransform
superclass:	Transform
methods:	initialize(x,y,color) render()

ColorTransform's constructor should take x, y, and color parameters. x and y should be passed to the superclass and color should be stored in an instance variable.

NOTE: Override render. Be sure to change the color (unless it is nil) before invoking your superclass.

Text

file:	src/main/ruby/render/assignment/text.rb
class:	Text
superclass:	ColorTransform
methods to evolve:	initialize(text, font, x: 0, y: 0, color: nil)
methods to add:	render_transformed()
methods to remove:	render()

You will evolve your code from from Part A

be sure to add the following line above your class:

require_relative 'color_transform'

Add keyword parameters for x: 0, y: 0, and color: nil to the constructor and pass them to the superclass.

NOTE: Be sure to not override render. Implement the render_transformed method instead.

NOTE: render_transformed() must be private.

Ellipse

file:	src/main/ruby/render/assignment/ellipse.rb
class:	Ellipse
superclass:	ColorTransform
methods to evolve:	initialize(x_radius, y_radius, x: 0, y: 0, color: nil)
methods to add:	render_transformed()
methods to remove:	render()

You will evolve your code from from Part A

be sure to add the following line above your class:

require_relative 'color_transform'

Add keyword parameters for x: 0, y: 0, and color: nil to the constructor and pass them to the superclass.

NOTE: Be sure to not override render. Implement the render_transformed method instead.

NOTE: render_transformed() must be private.

EquilateralTriangle

file:	src/main/ruby/render/assignment/equilateral_triangle.rb
class:	EquilateralTriangle
superclass:	ColorTransform
methods to evolve:	initialize(half_side_length, x: 0, y: 0, color: nil)
methods to add:	render_transformed()
methods to remove:	render()

You will evolve your code from from Part A

be sure to add the following line above your class:

require_relative 'color_transform'

Add keyword parameters for x: 0, y: 0, and color: nil to the constructor and pass them to the superclass.

NOTE: Be sure to not override render. Implement the render_transformed method instead.

NOTE: render_transformed() must be private.

BezierCurve

file:	src/main/ruby/render/assignment/bezier_curve.rb
class:	BezierCurve
superclass:	ColorTransform
methods to evolve:	initialize(control_points, x: 0, y: 0, color: nil)
methods to add:	render_transformed()
methods to remove:	render()

You will evolve your code from from Part A

be sure to add the following line above your class:

require_relative 'color_transform'

Add keyword parameters for x: 0, y: 0, and color: nil to the constructor and pass them to the superclass.

NOTE: Be sure to not override render. Implement the render_transformed method instead.

NOTE: render_transformed() must be private.

CircularSegment

file:	src/main/ruby/render/assignment/circular_segment.rb
class:	CircularSegment
superclass:	ColorTransform
methods to evolve:	initialize(x_radius, y_radius, theta_a, theta_z, x: 0, y: 0, color: nil)
methods to add:	render_transformed()
methods to remove:	render()

You will evolve your code from from Part A

be sure to add the following line above your class:

require_relative 'color_transform'

Add keyword parameters for x: 0, y: 0, and color: nil to the constructor and pass them to the superclass.

NOTE: Be sure to not override render. Implement the render_transformed method instead.

NOTE: render_transformed() must be private.

Rectangle

file:	src/main/ruby/render/assignment/rectangle.rb
class:	Rectangle
superclass:	ColorTransform
methods to evolve:	initialize(half_width, half_height, x: 0, y: 0, color: nil)
methods to add:	render_transformed()
methods to remove:	render()

You will evolve your code from from Part A

be sure to add the following line above your class:

require_relative 'color_transform'

Add keyword parameters for x: 0, y: 0, and color: nil to the constructor and pass them to the superclass.

NOTE: Be sure to not override render. Implement the render_transformed method instead.

NOTE: render_transformed() must be private.

CompositeTransform

file:	src/main/ruby/render/assignment/composite_transform.rb
class:	CompositeTransform
superclass:	Transform
methods:	initialize(x: 0, y: 0) push_component(component) render_transformed()

Add a push_component method which accepts a component which will later be rendered.

The render_transformed method should render each pushed component.

NOTE: render_transformed() must be private.

Scene

file:	src/main/ruby/render/assignment/scene.rb
class:	Scene
superclass:	Object
methods:	initialize(background_color: Color.new(0,0,0)) push_component(component) render()

Scene's constructor should take a keyword parameter background_color: Color.new(0,0,0) and store it in an instance variable.

Add a push_component method which accepts a component which will later be rendered.

The render method should set the clear color and clear the color buffer before rendering each pushed component.

glClearColor(@background_color.red, @background_color.green, @background_color.blue, 1.0)
glClear(GL_COLOR_BUFFER_BIT)

Testing Your Solution

Unit Test

Full Credit Fall 2020

file:

src/test/ruby/render/part_b/part_b_unit_test.rb

UnitTest

note: ensure that you have removed all printing to receive credit for any assignment.

Bonus Fall 2020

Ensure that all of the tests in the src/test/ruby/render/part_b_bare_bones and src/test/ruby/render/part_b_composite_transform_scene directories work as the will be required for Render_Part_C_Assignment

Visual Comparison

Bare Bones

file to run:

src/test/ruby/render/part_b/part_b_test_snapshots_web_page_generator.rb

Complete

file to run:

src/test/ruby/render/part_b_bare_bones/part_b_bare_bones_test_snapshots_web_page_generator.rb