Methods and Strings 1 (Solution)

Sample solution

require 'panda_canvas'

PandaCanvas.draw do

  pixel_count = 50
  angle = 2 * Math::PI / pixel_count
  x = 0
  y = -150
  i = 0
  while i < pixel_count
    new_x = x * Math.cos(angle) - y * Math.sin(angle)
    new_y = x * Math.sin(angle) + y * Math.cos(angle)
    x = new_x
    y = new_y
    pixel x + 320, y + 240
    i += 1
  end

end

Experiments

Try changing the pixel count and radius of the circle. Can you draw a solid line? Can you calculate how many pixels are required to draw a solid line for a given radius?

Move on

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