Class: SolidRuby::Helpers::Triangle

Inherits:
Primitives::Polygon show all
Defined in:
lib/solidruby/helpers/triangle.rb

Overview

Helper class for creating triangles, given three inputs (at least 1 side + angles) The triangle can then either be used as a Polygon, or it can be thrown away and used just for calcuation of the triangle order is assumed as follows: Angles go clockwise with @alpha at the origin Sides go clockwise with @a along the X axis, and @c along Y

Instance Attribute Summary collapse

Attributes inherited from SolidRubyObject

#attributes, #children, #siblings, #transformations

Instance Method Summary collapse

Methods inherited from Primitives::Polygon

#to_rubyscad

Methods inherited from SolidRubyObject

#&, alias_attr, #debug, #debug?, #mirror, #place, #rotate, #rotate_around, #save, #scale, #to_rubyscad, #translate, #union, #walk_tree, #walk_tree_classes

Constructor Details

#initialize(args = {}) ⇒ Triangle

Returns a new instance of Triangle.



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# File 'lib/solidruby/helpers/triangle.rb', line 27

def initialize(args = {})
  use_alt_solution = args[:alt_solution] || false

  if args.reject{|k| k == :alt_solution}.count != 3
    raise "Triangle requires exactly 3 inputs"
  elsif args[:a].nil? && args[:b].nil? && args[:c].nil?
    raise "Triangle requires at least 1 side length"
  end

  #try to solve twice to see if we have two solutions
  sol_count = 0
  solution = solve(args, false)
  sol_count += 1 unless solution.nil?
  solution_alt = solve(args, true)
  sol_count += 1 unless solution_alt.nil?

  raise "Could not solve triangle." if sol_count == 0

  @has_alt_solution = sol_count == 2 ? true : false

  if use_alt_solution
    update(solution_alt)
  else
    update(solution)
  end

  #consturct triangle polygon
  args = {points: [
    [0.0, 0.0],
    [@b, 0.0],
    [@c * Math.cos(radians(@alpha)), height(:beta)],
    [0.0, 0.0]]}

  super(args)
end

Instance Attribute Details

#a ⇒ Object

Returns the value of attribute a.



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# File 'lib/solidruby/helpers/triangle.rb', line 26

def a
  @a
end

#alpha ⇒ Object

Returns the value of attribute alpha.



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# File 'lib/solidruby/helpers/triangle.rb', line 26

def alpha
  @alpha
end

#b ⇒ Object

Returns the value of attribute b.



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# File 'lib/solidruby/helpers/triangle.rb', line 26

def b
  @b
end

#beta ⇒ Object

Returns the value of attribute beta.



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# File 'lib/solidruby/helpers/triangle.rb', line 26

def beta
  @beta
end

#c ⇒ Object

Returns the value of attribute c.



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# File 'lib/solidruby/helpers/triangle.rb', line 26

def c
  @c
end

#gamma ⇒ Object

Returns the value of attribute gamma.



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# File 'lib/solidruby/helpers/triangle.rb', line 26

def gamma
  @gamma
end

#has_alt_solution ⇒ Object

Returns the value of attribute has_alt_solution.



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# File 'lib/solidruby/helpers/triangle.rb', line 26

def has_alt_solution
  @has_alt_solution
end

Instance Method Details

#height(angle) ⇒ Object 



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# File 'lib/solidruby/helpers/triangle.rb', line 63

def height(angle)
  case angle
  when :alpha
    ang = @beta
    side = @c
  when :beta
    ang = @alpha
    side = @c
  else
    ang = @alpha
    side = @b
  end
  Math.sin(radians(ang)) * side.to_f
end