Class: Sevgi::Geometry::Equation::Line::Diagonal

Inherits:
Object
  • Object
show all
Defined in:
lib/sevgi/geometry/equation/line/diagonal.rb

Direct Known Subclasses

Horizontal

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(slope:, intercept:) ⇒ Diagonal 



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 10

def initialize(slope:, intercept:)
  @slope     = slope.to_f
  @intercept = intercept.to_f
  @direction = F.angles(@slope)
end

Instance Attribute Details

#direction ⇒ Object (readonly)

Returns the value of attribute direction.



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 8

def direction
  @direction
end

#intercept ⇒ Object (readonly)

Returns the value of attribute intercept.



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 8

def intercept
  @intercept
end

#slope ⇒ Object (readonly)

Returns the value of attribute slope.



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 8

def slope
  @slope
end

Instance Method Details

#approx(precision = nil) ⇒ Object 



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 16

def approx(precision = nil)
  self.class.new(slope: F.approx(slope, precision), intercept: F.approx(intercept, precision))
end

#eql?(other) ⇒ Boolean Also known as: == 



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 20

def eql?(other)
  self.class == other.class && [ slope, intercept ] == [ other.slope, other.intercept ]
end

#hash ⇒ Object 



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 24

def hash
  [ self.class, slope, intercept ].hash
end

#intersection(other) ⇒ Object 



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 28

def intersection(other)
  case other
  when Diagonal   then y = y(x = (other.intercept - intercept) / (slope - other.slope))
  when Horizontal then x = x(y = other.y)
  when Vertical   then y = y(x = other.x)
  end

  Point[x, y]
end

#left?(point) ⇒ Boolean 



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 38

def left?(point)
  F.gt?(point.y, y(point.x))
end

#onto?(point) ⇒ Boolean 



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 42

def onto?(point)
  F.eq?(point.y, y(point.x))
end

#right?(point) ⇒ Boolean 



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 46

def right?(point)
  F.lt?(point.y, y(point.x))
end

#shift(distance = nil, dx: nil, dy: nil) ⇒ Object 



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 50

def shift(distance = nil, dx: nil, dy: nil)
  dx ||= 0.0
  dy ||= 0.0

  if distance
    dx += F.rx(distance, direction)
    dy -= F.ry(distance, direction)
  end

  Diagonal.new(slope:, intercept: intercept - slope * dx + dy)
end

#to_s ⇒ Object 



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 62

def to_s
  strings = []

  strings << "#{F.approx(slope)} * x"     if F.nonzero?(slope)
  strings << F.approx(intercept).abs.to_s if F.nonzero?(intercept)

  "L<y = #{strings.join(intercept.positive? ? " + " : " - ")}>"
end

#x(y) ⇒ Object 



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 71

def x(y)
  (y - intercept) / slope
end

#y(x) ⇒ Object 



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# File 'lib/sevgi/geometry/equation/line/diagonal.rb', line 75

def y(x)
  (slope * x) + intercept
end