ruby - 我怎样才能使这双鞋的代码不至于使计算机陷入困境？

Question

这是我的代码的当前状态，虽然我得到了预期的效果，但它并没有按照我需要的方式工作。因为该程序处于无限循环中，显然它会不断地在彼此之上产生两个背景渐变，并且每个循环都会产生 10 个圆圈，并且它们很快就会过度产生并立即减慢程序速度。

这里是:

Shoes.app ( :title => 'Circles', :width => 500, :height => 500, :resizable => false ) do
            i = 0
# Animation loop
    animate ( 24 ) do |i|
# Variables For Randomized Colours
            randomCol = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )
            randomCol2 = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )
            randomCol3 = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )
            randomCol4 = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )
            background randomCol..randomCol2
            fill    randomCol3
            stroke  randomCol4
            strokewidth     ( 0..5 ).rand
# Generate 10 circles per loop cycle
            10.times{
            i += 1
            oval :left => ( -5..self.width ).rand,
            :top => ( -5..self.height ).rand,
            :radius => ( 1..100 ).rand
            } end
        end

我已经尝试了我能想到的，但我对 Ruby 的语法并不太熟悉，或者我用 Ruby 能做的鞋子能做或不能做的事情。非常感谢关于从这里去哪里的一些建议。

Answer 1

您绘制的每个椭圆和背景在内存中都是一个单独的项目，这意味着它们会在一段时间后陷入困境。如果你只是想显示你画的最后一帧，那么你需要每次都清空应用程序:

Shoes.app ( :title => 'Circles', :width => 500, :height => 500, :resizable => false ) do

  # Animation loop
  animate ( 24 ) do |i|
    app.clear

    # Variables For Randomized Colours
    randomCol = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )
    randomCol2 = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )
    randomCol3 = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )
    randomCol4 = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )

    background randomCol..randomCol2
    fill    randomCol3
    stroke  randomCol4
    strokewidth ( 0..5 ).rand

    # Generate 10 circles per loop cycle
    10.times do |i|
      i += 1
      oval :left => ( -5..self.width ).rand,
        :top => ( -5..self.height ).rand,
        :radius => ( 1..100 ).rand
    end
  end
end

这不像你原来的那样酷(除了它会无限期运行的事实)，因为你不再有分层效果。那样的话，我们可以让它跑几次再清零。在此示例中，它将每六次清除一次:

Shoes.app ( :title => 'Circles', :width => 500, :height => 500, :resizable => false ) do

  # Animation loop
  animate ( 24 ) do |i|
    app.clear if (i % 6 == 0)

    # Variables For Randomized Colours
    randomCol = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )
    randomCol2 = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )
    randomCol3 = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )
    randomCol4 = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )

    background randomCol..randomCol2
    fill    randomCol3
    stroke  randomCol4
    strokewidth ( 0..5 ).rand

    # Generate 10 circles per loop cycle
    10.times do |i|
      i += 1
      oval :left => ( -5..self.width ).rand,
        :top => ( -5..self.height ).rand,
        :radius => ( 1..100 ).rand
    end
  end
end

现在一个更有趣的策略是保留最后的 n 遍并清除最旧的，这样我们在屏幕上总是有，比如说，6 层(我发现 6 是一个好的截止点，但您的意见(和计算机的性能!)可能会有所不同:

Shoes.app ( :title => 'Circles', :width => 500, :height => 500, :resizable => false ) do
  n = 6
  @layers = []
  n.times { @layers << [] }
  # Animation loop
  animate ( 24 ) do |i|
    oldest = i % n
    # Clear out oldest frame
    @layers[oldest].each {|x| x.remove}
    @layers[oldest] = []

    # Variables For Randomized Colours
    randomCol = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )
    randomCol2 = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )
    randomCol3 = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )
    randomCol4 = rgb( ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand, ( 0..255 ).rand )

    @layers[oldest] << background(randomCol..randomCol2)
    fill    randomCol3
    stroke  randomCol4
    strokewidth ( 0..5 ).rand

    # Generate 10 circles per loop cycle
    10.times do |i|
      @layers[oldest] << oval (:left => ( -5..self.width ).rand,
        :top => ( -5..self.height ).rand,
        :radius => ( 1..100 ).rand)
      end
  end
end