Class: Polygon::Validator

Inherits:
Object
  • Object
show all
Defined in:
lib/polygon/validator.rb,
lib/polygon/validator/version.rb

Overview

Validator service for polygon shapes

Could be used to validate if a point is inside a shape

Defined Under Namespace

Classes: Error

Constant Summary collapse

VERSION = 
'2.0.0'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(shape) ⇒ Validator

Returns a new instance of Validator.

Parameters:



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# File 'lib/polygon/validator.rb', line 18

def initialize(shape)
  @shape = shape
end

Instance Attribute Details

#shape ⇒ Object (readonly)

Returns the value of attribute shape.



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# File 'lib/polygon/validator.rb', line 15

def shape
  @shape
end

Instance Method Details

#contains_point?(point) ⇒ true, false

Validate if a point is inside the shape

Parameters:

  • point (Polygon::Point) —

    the point to validate if it is inside the shape

Returns:

  • (true, false) —

    true if point is inside the shape



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# File 'lib/polygon/validator.rb', line 27

def contains_point?(point)
  points = shape.points
  winding_number = 0

  points.each.with_index do |point_a, i|
    point_b = point_a == points.last ? points.first : points[i + 1]

    next unless vertically_in_bounds?(point_a, point_b, point)

    winding_number += (left_offset(point_a, point_b, point) <=> 0)
  end

  !winding_number.zero?
end