Render Part A Assignment

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Diagram

Diagram part a.png

Code to Use

Graphics

draw_convex_polygon
draw_curve
draw_image
draw_string

Point2

Math

Math.cos(radians)
Math.sin(radians)


Code to Implement

Each of the renderable components has its own file in the src/main/ruby/drawings/core directory.

Be sure to add accessors for all constructor parameters.

How to use attr_accessor

Equilateral Triangle

file: src/main/ruby/drawings/core/equilateral_triangle.rb Ruby logo.svg
class: EquilateralTriangle
superclass: Object
methods: initialize(half_side_length)
half_side_length()
half_side_length=()
render(g)

Equilateral Triangle Render Studio.svg

wikipedia

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/core/equilateral_triangle.rb Ruby logo.svg

Render equilateral triangle.png

Rectangle

file: src/main/ruby/drawings/core/rectangle.rb Ruby logo.svg
class: Rectangle
superclass: Object
methods: initialize(half_width, half_height)
half_width()
half_width=()
half_height()
half_height=()
render(g)

Add an accessors for half_width and half_height.

file to run: src/main/ruby/drawings/core/rectangle.rb Ruby logo.svg

Render rectangle.png

Ellipse

file: src/main/ruby/drawings/core/ellipse.rb Ruby logo.svg
class: Ellipse
superclass: Object
methods: initialize(x_radius, y_radius)
x_radius()
x_radius=()
y_radius()
y_radius=()
render(g)

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/core/ellipse.rb Ruby logo.svg

Render ellipse.png

CircularSegment

file: src/main/ruby/drawings/core/circular_segment.rb Ruby logo.svg
class: CircularSegment
superclass: Object
methods: initialize(x_radius, y_radius, theta_a, theta_z)
render(g)

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.

Chord theta a z.png

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/core/circular_segment.rb Ruby logo.svg

Render chord.png

Image

file: src/main/ruby/drawings/core/image.rb Ruby logo.svg
class: Image
superclass: Object
methods: initialize(path)
render(g)

should draw the pixels from (0,0)

file to run: src/main/ruby/drawings/core/image.rb Ruby logo.svg

Render image.png

Text

file: src/main/ruby/drawings/core/text.rb Ruby logo.svg
class: Text
superclass: Object
methods: initialize(text, font)
render(g)
file to run: src/main/ruby/drawings/core/text.rb Ruby logo.svg

Render text.png

Bézier Curve

file: src/main/ruby/drawings/core/bezier_curve.rb Ruby logo.svg
class: BezierCurve
superclass: Object
methods: initialize(control_points)
render(g)

NOTE: you need not implement the interpolation yourself. Use the draw_curve method on Graphics.

Quadratic (Second Order) Curve: Bézier 2 big.svg Bézier 2 big.gif
Quadratic (Third Order) Curve: Bézier 3 big.svg Bézier 3 big.gif
Fourth Order Curve: Bézier 4 big.svg Bézier 4 big.gif
file to run: src/main/ruby/drawings/core/bezier_curve.rb Ruby logo.svg

Render bezier curve.png

Testing Your Solution

Unit Test

file: src/test/ruby/drawings/core/relatively_fast/part_a/*.rb Ruby logo.svg UnitTest

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

file: src/test/ruby/drawings/core/relatively_slow/part_a/*.rb Ruby logo.svg UnitTest

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

Visual Comparison

file to run: src/test/ruby/drawings/core/snapshots/part_a_snapshots_web_page_generator.rb Ruby logo.svg

Somewhat Outdated Testing Demo