Module: Fusuma::Plugin::Touchscreen::Math

Defined in:
lib/fusuma/plugin/touchscreen/math.rb

Class Method Summary collapse

Class Method Details

.angle_between(base_point, other_point) ⇒ Object 



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# File 'lib/fusuma/plugin/touchscreen/math.rb', line 58

def self.angle_between(base_point, other_point)
  radians = ::Math.atan2(other_point[:y] - base_point[:y], other_point[:x] - base_point[:x])
  degrees = radians * 180.0 / ::Math::PI
  degrees += 360.0 if degrees < 0
  degrees
end

.angles_average(angles) ⇒ Object 



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# File 'lib/fusuma/plugin/touchscreen/math.rb', line 27

def self.angles_average(angles)
  sum_x = 0.0
  sum_y = 0.0

  angles.each do |angle|
    radians = angle * ::Math::PI / 180.0
    sum_x += ::Math.cos(radians)
    sum_y += ::Math.sin(radians)
  end

  average_radians = ::Math.atan2(sum_y, sum_x)
  average_degrees = average_radians * 180.0 / ::Math::PI
  average_degrees += 360.0 if average_degrees < 0

  average_degrees
end

.angles_difference(angle1, angle2) ⇒ Object 



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# File 'lib/fusuma/plugin/touchscreen/math.rb', line 6

def self.angles_difference(angle1, angle2)
  normalized_angle1 = normalize_angle(angle1)
  normalized_angle2 = normalize_angle(angle2)

  raw_difference = normalized_angle2 - normalized_angle1

  if raw_difference < -180
    raw_difference += 360
  elsif raw_difference > 180
    raw_difference -= 360
  end

  raw_difference
end

.center(points) ⇒ Object 



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# File 'lib/fusuma/plugin/touchscreen/math.rb', line 52

def self.center(points)
  x = points.map { |p| p[:x] }.reduce(:+) / points.size
  y = points.map { |p| p[:y] }.reduce(:+) / points.size
  { x: x, y: y }
end

.distance(point1, point2) ⇒ Object 



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# File 'lib/fusuma/plugin/touchscreen/math.rb', line 44

def self.distance(point1, point2)
  ::Math.sqrt((point1[:x] - point2[:x])**2 + (point1[:y] - point2[:y])**2)
end

.distance_from_line(x, y, k, b) ⇒ Object 



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# File 'lib/fusuma/plugin/touchscreen/math.rb', line 48

def self.distance_from_line(x, y, k, b)
  (k * x + b - y).abs / ::Math.sqrt(k**2 + 1)
end