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.

Do NOT worry if your images are not exact matches of the reference images.

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