shoes_life.rb |
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A simple Shoes app to visualize my implementation of Conway’s Game of life. |
require 'life' |
Das Glasperlenspiel |
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The |
class GlassBeadGame
def initialize(cells, width, height, app) |
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The Shoes app, defined below this class, is saved as |
@app = app
@app.nostroke |
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Scale the cells according to the size of the grid. |
@cell_width = @app.width / width
@cell_height = @app.height / height
@life = Life.new cells, width, height
end |
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Time keeps on ticking, ticking, into the future. |
def tick
@life = @life.next_gen
end |
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Clear the screen and redraw all the cells. |
def draw
@app.clear
@life.cells.each do |coordinates|
x = coordinates[0]
y = coordinates[1] |
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Cells that are going to live look different from dying cells. |
if @life.should_remain_alive?(x, y)
@app.fill rgb(0x30, 0x30, 0xBB)
else
@app.fill rgb(0x50, 0x50, 0xFF)
end
@app.rect :left => x * @cell_width,
:top => y * @cell_height,
:width => @cell_width,
:height => @cell_height
end
end |
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Mouse clicks are our only user interactions. |
def click(button, x, y) |
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Left Click: Bring a dead cell to life. |
if button == 1
x = x / @cell_width
y = y / @cell_height
@life.set_cell_alive! x, y
self.draw |
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Right Click: Re-seed the grid. |
else
randomize_cells!
end
end |
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When randomizing the cells, there’s a 50% chance each cells will be alive. |
def randomize_cells!
@life.height.times do |y|
@life.width.times do |x|
@life.set_cell_alive! x, y if rand > 0.5
end
end
end
end |
The Shoes App |
Shoes.app(:title => 'TDD Game of Life', :height => 300, :width => 300) do
app = self
gbg = GlassBeadGame.new [], 30, 30, app |
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To start, the Grid is seeded with random cells. |
gbg.randomize_cells!
click do |button, x, y|
gbg.click(button, x, y)
end |
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Attempt to generate and draw eight ticks a second. |
animate(8) do
gbg.tick
gbg.draw
end
end |
UNLICENSEThis is free and unencumbered software released into the public domain. |
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