Render Part A Assignment
Contents
OpenGL
GLUT
Code to Investigate
Cavalcade of Graphics
file to run: | src/main/ruby/render/examples/cavalcade_of_graphics.rb |
Code to Implement
Each of the renderable components has its own file in the src/main/ruby/render/assignment
directory.
Be sure to add accessors for all constructor parameters.
Equilateral Triangle
file: | src/main/ruby/drawings/equilateral_triangle.rb | |
class: | EquilateralTriangle | |
superclass: | Object | |
methods: | initialize(half_side_length) half_side_length() half_side_length=() render() |
WARNING: Ruby division of two integers results in an integer. For example: 1/3 == 0
The triangle should be equilateral, rendered with its the origin at the center of mass.
Your constructor should accept a half_side_length
parameter.
Add an accessor for half_side_length.
The height of the triangle should be side_length * sqrt(3)/2
The center of mass is one third from the bottom.
So, the bottom left point A's x coordinate should be -half_side_length
and its y coordinate should be -1/3 height
.
file to run: | src/main/ruby/drawings/equilateral_triangle.rb |
Rectangle
file: | src/main/ruby/drawings/rectangle.rb | |
class: | Rectangle | |
superclass: | Object | |
methods: | initialize(half_width, half_height) half_width() half_width=() half_height() half_height=() render() |
Add an accessors for half_width and half_height.
file to run: | src/main/ruby/drawings/rectangle.rb |
Ellipse
file: | src/main/ruby/drawings/ellipse.rb | |
class: | Ellipse | |
superclass: | Object | |
methods: | initialize(x_radius, y_radius) x_radius() x_radius=() y_radius() y_radius=() render() |
Add an accessors for x_radius and y_radius.
Note: to produce the reference image the code below was used:
slice_count = 32 delta_theta = (2*Math::PI) /slice_count
file to run: | src/main/ruby/drawings/ellipse.rb |
CircularSegment
file: | src/main/ruby/drawings/circular_segment.rb | |
class: | CircularSegment | |
superclass: | Object | |
methods: | initialize(x_radius, y_radius, theta_a, theta_z) render() |
In geometry a chord is a line segment which joins two points on a curve. We will define a class CircularSegment
which renders a filled shape of an ellipse cut at the chord between theta_a and theta_z.
Note: to produce the reference image the code below was used:
slice_count = 32 delta_theta = (@theta_z-@theta_a) / slice_count
Note: a Chord with 32 slices will have 33 points.
file to run: | src/main/ruby/drawings/circular_segment.rb |
Image
file: | src/main/ruby/drawings/image.rb | |
class: | Image | |
superclass: | Object | |
methods: | initialize(path) render() |
should draw the pixels from (0,0)
file to run: | src/main/ruby/drawings/image.rb |
Text
file: | src/main/ruby/drawings/image.rb | |
class: | Text | |
superclass: | Object | |
methods: | initialize(text, font) render() |
file to run: | src/main/ruby/drawings/text.rb |
Point2
To support Bézier curves you will want to implement Point2 in point2.rb. You may wish to use Ruby's convenient Struct construct.
You should be able to construct a Point2 with an x and a y and be able to access those values.
Bézier Curve
file: | src/main/ruby/drawings/bezier_curve.rb | |
class: | BezierCurve | |
superclass: | Object | |
methods: | initialize(control_points) render() |
NOTE: you need not implement the interpolation yourself. Check cavalcade_of_graphics for an example of how to draw a curve.
Quadratic (Second Order) Curve: | ||
Quadratic (Third Order) Curve: | ||
Fourth Order Curve: |
file to run: | src/main/ruby/drawings/bezier_curve.rb |
Testing Your Solution
Visual Comparison
file to run: | src/test/ruby/render/part_a/part_a_test_snapshots_web_page_generator.rb |
Unit Test
file: | src/test/ruby/render/part_a/part_a_unit_test.rb | UnitTest |
note: ensure that you have removed all printing to receive credit for any assignment.