Get average heading

Processing Coding Questions
4

Just for a laugh I tried this in JRubyArt:-

attr_reader :aaa, :abb

def settings
  size(300, 300)
end

def setup
  sketch_title "Average Heading"
  @aaa = 225
  @abb = 135
end

def draw
  background(200)
  stroke(0)
  noFill
  circle(width / 2, height / 2, width)
  push_matrix
  translate(width / 2, height / 2)
  vector_a = Vec2D.from_angle(aaa.radians)
  vector_b = Vec2D.from_angle(abb.radians)
  stroke(255, 0, 0)
  line(0, 0, vector_a.x * 150, vector_a.y * 150)
  line(0, 0, vector_b.x * 150, vector_b.y * 150)
  averageHeading = ((vector_a + vector_b) / 2.0).heading
  vector_c = Vec2D.from_angle(averageHeading)
  vector_c.set_mag(150)
  stroke(255, 0, 255)
  line(0, 0, vector_c.x, vector_c.y)
  pop_matrix
end

heading
Works with 45 and -45 degrees gets:-
reverse

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