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animated_flowers by jsager12 

# This is an animation of two  sets of circles moving in different
# directions. As the circles move they change size and color. 
#

degree = 0
color = 0
size = 0

Shoes.app :width => 537, :height => 500 do
  mx, my = (500/2).to_i, (537/2).to_i
  animate(24) do
    clear do
      # Manage color
      nostroke
      background rgb(1.0, 0.5, 1.0, 1.0)

      # Update some variables
      degree += 1
      size += 1
      degree = 0 if(degree >= 360)
      size = 0 if(size >= 100)
      color = 0.0 if(color >= 1.0)
      color += 0.05 if(degree % 10 == 0)

      # Draw inner circle
      fill red(color)
      10.times do |i|
        current_size = 100 + size
        d = to_radians(i * 60 + degree)
        rx = Math::cos(d) * 100
        ry = Math::sin(d) * 100
        center_x = -current_size/2 + rx + mx
        center_y = -current_size/2 + ry + my
        oval center_x, center_y, current_size, current_size
      end

      # Draw outer circle
      fill blue(color)
      20.times do |i|
        current_size = 50 + size
        d = to_radians(i * 30 - degree)
        rx = Math::cos(d) * 150
        ry = Math::sin(d) * 150
        center_x = -current_size/2 + rx + mx
        center_y = -current_size/2 + ry + my
        oval center_x, center_y, current_size, current_size
      end
    end
  end
end

# Convert degrees to radians
def to_radians(deg)
  deg * Math::PI / 180
end