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Contents
#
# This is from juixe "Running with Shoes - 2D Examples"
# http://juixe.com/techknow/index.php/2007/10/19/running-with-shoes-2d-examples/
#
# This is an animation of two concentric 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
Version data entries
6 entries across 6 versions & 2 rubygems