Module: GridGenerator::Helper

Defined in:
lib/grid_generator/helper.rb

Class Method Summary collapse

Class Method Details

.distance(a, b) ⇒ Object 



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# File 'lib/grid_generator/helper.rb', line 3

def self.distance(a, b)
  Math.sqrt((b[0,0] - a[0,0])**2 + (b[1,0] - a[1,0])**2)
end

.intersection(ab, cd) ⇒ Object 



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# File 'lib/grid_generator/helper.rb', line 22

def self.intersection(ab,cd)
    x1 = ab.a[0,0]
    y1 = ab.a[1,0]
    x2 = ab.b[0,0]
    y2 = ab.b[1,0]
    x3 = cd.a[0,0]
    y3 = cd.a[1,0]
    x4 = cd.b[0,0]
    y4 = cd.b[1,0]

    px_numerator = (x1 * y2 - y1 * x2) * (x3 - x4) - (x1 - x2) * (x3 * y4 - y3 * x4)
    px_denominator = (x1 - x2) * (y3 - y4) - (y1 - y2) * (x3 - x4)

    py_numerator = (x1 * y2 - y1 * x2) * (y3 - y4) - (y1 - y2) * (x3 * y4 - y3 * x4)
    py_denominator = (x1 - x2) * (y3 - y4) - (y1 - y2) * (x3 - x4)

    px = px_numerator.to_f / px_denominator
    py = py_numerator.to_f / py_denominator

    Matrix.column_vector([px, py])
end

.intervals(a, b, i) ⇒ Object

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# File 'lib/grid_generator/helper.rb', line 9

def self.intervals(a, b, i)
  dx = b[0,0] - a[0,0]
  dy = b[1,0] - a[1,0]

  Array.new(i) do |n|
    interval_x = dx / (i + 1) 
    interval_y = dy / (i + 1)
    x = a[0,0] + (n + 1) * interval_x
    y = a[1,0] + (n + 1) * interval_y
    Matrix.column_vector([x, y])
  end
end