Added scripts

scripts/Particles.rb

@@ -0,0 +1,109 @@
+
+class Particle
+  def initialize(viewport, bitmap)
+    @sprite = Sprite.new(viewport)
+    @sprite.bitmap = bitmap
+    @sprite.ox = bitmap.width / 2
+    @sprite.oy = bitmap.height / 2
+    self.x = rand(640)
+    self.y = rand(480)
+  end
+
+  # Link various things to the sprite
+  def x
+    @x
+  end
+  def x=(val)
+    @x = val
+    width = @sprite.bitmap.width * @sprite.zoom_x
+    if @x < -width
+      @x = 640 + width
+    elsif @x > 640 + width
+      @x = -width
+    end
+    @sprite.x = @x
+  end
+  def y
+    @y
+  end
+  def y=(val)
+    @y = val
+    height = @sprite.bitmap.height * @sprite.zoom_y
+    if @y < -height
+      @y = 480 + height
+    elsif @y > 480 + height
+      @y = -height
+    end
+    @sprite.y = @y
+  end
+  def scale
+    @sprite.zoom_x
+  end
+  def scale=(val)
+    @sprite.zoom_x = val
+    @sprite.zoom_y = val
+  end
+  def opacity
+    @sprite.opacity
+  end
+  def opacity=(val)
+    @sprite.opacity = val
+  end
+  def dispose
+    @sprite.dispose
+    @sprite = nil
+  end
+end
+
+class Particle_Firefly < Particle
+  @@bitmap = RPG::Cache.picture('firefly')
+
+  def initialize(viewport)
+    super(viewport, @@bitmap)
+    @phase = rand(120)
+    @wavelength = rand(120..240)
+    @vx = rand(0.2..1.5) * (rand(2) * 2 - 1)
+    @vy = rand(0.2..1.5) * (rand(2) * 2 - 1)
+    self.scale = rand(0.02..0.08)
+  end
+
+  def update
+    self.x += @vx
+    self.y += @vy
+    self.opacity = Math.sin((@phase / @wavelength.to_f) * Math::PI) * 255
+    @phase = (@phase + 1) % @wavelength
+  end
+end
+
+# A layer of moving particle objects, useful for fireflies and shrimp
+class ParticleLayer
+  def initialize(viewport, klass, count)
+    @particles = Array.new(count)
+    count.times do |i|
+      @particles[i] = klass.new(viewport)
+    end
+    @last_map_x = $game_map.display_x / 4
+    @last_map_y = $game_map.display_y / 4
+  end
+
+  def update
+    return unless @particles
+    map_x = $game_map.display_x / 4
+    map_y = $game_map.display_y / 4
+    @particles.each do |p|
+      p.x += @last_map_x - map_x
+      p.y += @last_map_y - map_y
+      p.update
+    end
+    @last_map_x = map_x
+    @last_map_y = map_y
+  end
+
+  def dispose
+    return unless @particles
+    @particles.each do |p|
+      p.dispose
+    end
+    @particles = nil
+  end
+end