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Gray_Scott を Gtk でアニメーション表示
require 'numo/narray'
require 'gtk3'
include Numo
SPACE_GRID_SIZE = 256
VISUALIZATION_STEP = 8
Dx = 0.01
Du = 2e-5
Dv = 1e-5
def laplacian(ary, base)
inflow_from_top = base.reshape(SPACE_GRID_SIZE, SPACE_GRID_SIZE)
inflow_from_bottom = base.reshape(SPACE_GRID_SIZE, SPACE_GRID_SIZE)
inflow_from_left = base.reshape(SPACE_GRID_SIZE, SPACE_GRID_SIZE)
inflow_from_right = base.reshape(SPACE_GRID_SIZE, SPACE_GRID_SIZE)
outflow = base.reshape(SPACE_GRID_SIZE, SPACE_GRID_SIZE)
(SPACE_GRID_SIZE - 1).times do |i|
inflow_from_top[i + 1, true] = ary[i, true]
inflow_from_bottom[i, true] = ary[i + 1, true]
inflow_from_left[true, i + 1] = ary[true, i]
inflow_from_right[true, i] = ary[true, i + 1]
end
outflow = ary * 4
(inflow_from_top + inflow_from_bottom + inflow_from_left +
inflow_from_right - outflow) / (Dx * Dx)
end
def calc(u, v, f, k)
u_base = SFloat.ones(SPACE_GRID_SIZE, SPACE_GRID_SIZE)
v_base = SFloat.zeros(SPACE_GRID_SIZE, SPACE_GRID_SIZE)
VISUALIZATION_STEP.times do
partial_u = laplacian(u, u_base) * Du - u * v * v + (1.0 - u) * f
partial_v = laplacian(v, v_base) * Dv + u * v * v - (f + k) * v
u += partial_u
v += partial_v
end
[u, v]
end
window = Gtk::Window.new
window.set_size_request(SPACE_GRID_SIZE, SPACE_GRID_SIZE)
image = Gtk::Image.new
fixed = Gtk::Fixed.new
fixed.put(image, 0, 0)
window.add(fixed)
SQUARE_SIZE = 20
u = SFloat.ones(SPACE_GRID_SIZE, SPACE_GRID_SIZE)
v = SFloat.zeros(SPACE_GRID_SIZE, SPACE_GRID_SIZE)
square_start = SPACE_GRID_SIZE / 2 - SQUARE_SIZE / 2
square_end = SPACE_GRID_SIZE / 2 + SQUARE_SIZE / 2
u[square_start..square_end, square_start..square_end] = 0.5
v[square_start..square_end, square_start..square_end] = 0.25
#GLib::Timeout.add(120)の120はアニメーションのウェイト時間(ミリ秒)
GLib::Timeout.add(120) do
u, v = calc(u, v, 0.022, 0.051) #このパラメータをいろいろ変える
for_visualize = UInt8.cast(u * 255)
data = UInt8.zeros(SPACE_GRID_SIZE, SPACE_GRID_SIZE, 3)
data[true, true, 0] = for_visualize
data[true, true, 1] = for_visualize
data[true, true, 2] = for_visualize
image.pixbuf = GdkPixbuf::Pixbuf.new(data: data.to_string,
width: SPACE_GRID_SIZE, height: SPACE_GRID_SIZE)
end
window.show_all
window.signal_connect("destroy") { Gtk.main_quit }
Gtk.main
#http://obelisk.hatenablog.com/entry/2019/11/14/231021
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