随手写了一个粒子特效

有丘直方

[pre lang="ruby"]
class Particle < Sprite
  BITMAP = Bitmap.new(64, 64)
  64.times do |x|
    64.times do |y|
      if (x - 32) ** 2 + (y - 32) ** 2 <= 128
        BITMAP.set_pixel(x, y, Color.new(255, 0, 0))
      end
    end
  end
  32.times { BITMAP.blur }
  
  VIEWPORT = Viewport.new(-128, -128, 1280, 1024)
  
  @@z = 1 << 30
  
  def initialize(x, y)
    super(VIEWPORT)
    self.bitmap = BITMAP.clone
    self.ox = 8
    self.oy = 8
    self.x = x + 128
    self.y = y + 128
    self.opacity = 0
    self.z = (@@z -= rand(2))
    @frame_count = 0
    @velocity = rand / 2
    @acceleraction = rand / 2000
    @float_y = self.y
    @fade_in_rate = rand(10) + 15
    @fade_out_rate = rand(5) + 5
    @zoom_rate = rand / 400
    @life = rand(50) + 150
    @tone_change_rate = rand / 2 + 0.5
    @float_tone = 0
  end
  
  def update
    @float_y -= (@velocity += @acceleraction)
    self.y = @float_y
    self.opacity += @fade_in_rate if opacity < 255 && @frame_count < @life
    self.opacity -= @fade_out_rate if @frame_count >= @life
    self.zoom_x += @zoom_rate
    self.zoom_y += @zoom_rate
    bitmap.hue_change(3) if @frame_count % 10 == 0
    @float_tone += @tone_change_rate
    tone.red = @float_tone
    tone.green = @float_tone
    tone.blue = @float_tone
    if opacity <= 0
      bitmap.dispose
      dispose
    end
    @frame_count += 1
  end
end

class Scene
  def initialize
    Graphics.resize_screen(1024, 768)
    @x = Graphics.width / 2
    @y = Graphics.height / 2
    @particles = []
  end

  def set_position(x, y)
    @x, @y = x, y
  end

  def update
    update_basic
    update_position
    update_particles
  end

  def update_basic
    Mouse.update
    Graphics.update
  end

  def update_particles
    @particles.each(&:update)
    @particles.delete_if(&:disposed?)
    360.times do |angle|
      if rand(120) == 0
        radian = angle * Math::PI / 180
        radius = rand(4) + 62
        x = @x + Math.cos(radian) * radius
        y = @y + Math.sin(radian) * radius
        @particles.push(Particle.new(x, y))
      end
    end
  end

  def update_position
    set_position(Mouse.x, Mouse.y) if Mouse.press?
  end
end

scene = Scene.new
loop { scene.update }
[/pre]
写得太差劲了，看上去没什么感觉
使用RGD

apolinz

谢谢大佬！拿去用顺便膜一下大佬

myownroc

用RGSS实现真的不会卡吗- -