Branch Assignment

Lindenmayer system

Code to Investigate

class Turtle
  def self.set_color(color)
    glColor3f(color.red, color.green, color.blue)
  end

  def self.draw_line(length, width_in_pixels)
    glLineWidth(width_in_pixels)
    glBegin(GL_LINES)
    glVertex2d(0.0, 0.0)
    glVertex2d(length, 0.0)
    glEnd()
  end

  def self.move_forward(magnitude)
    glTranslatef(magnitude, 0.0, 0.0)
  end

  def self.turn(theta)
    glRotatef(theta, 0.0, 0.0, 1.0)
  end
end

Code to Implement

OpenGLStackUtils

class OpenGLStackUtils
  def self.push_do_pop
    raise :not_yet_implemented
  end
end

Branch

class Branch
  def branch(length, line_width_in_pixels, depth_remaining)
    raise :not_yet_implemented
  end
end

Note: to produce the reference images the code below was used:

      next_length = length * 0.5
      next_line_width_in_pixels = line_width_in_pixels * 0.8

Note: the child branches are 1.0/3.0 from the beginning and the end.

Note: the child branches are rotated 30.0 degrees and -30.0 degrees.

Note: in the recursive case the child branches were drawn before the line at the current depth to allow the green to be beneath the brown.

max_depth: 0	max_depth: 1	max_depth: 2	max_depth: 3	max_depth: 4	max_depth: 5