Data commit

Task/Plasma-effect/Ruby/plasma-effect.rb

@@ -0,0 +1,61 @@
+attr_reader :buffer, :palette, :r, :g, :b, :rd, :gd, :bd, :dim
+
+def settings
+  size(600, 600)
+end
+
+def setup
+  sketch_title 'Plasma Effect'
+  frame_rate 25
+  @r = 42
+  @g = 84
+  @b = 126
+  @rd = true
+  @gd = true
+  @bd = true
+  @dim = width * height
+  @buffer = Array.new(dim)
+  grid(width, height) do |x, y|
+    buffer[x + y * width] = (
+      (
+        (128 + (128 * sin(x / 32.0))) +
+        (128 + (128 * cos(y / 32.0))) +
+        (128 + (128 * sin(Math.hypot(x, y) / 32.0)))
+      ) / 4
+    ).to_i
+  end
+  load_pixels
+end
+
+def draw
+  if rd
+    @r -= 1
+    @rd = false if r.negative?
+  else
+    @r += 1
+    @rd = true if r > 128
+  end
+  if gd
+    @g -= 1
+    @gd = false if g.negative?
+  else
+    @g += 1
+    @gd = true if g > 128
+  end
+  if bd
+    @b -= 1
+    @bd = false if b.negative?
+  else
+    @b += 1
+    @bd = true if b > 128
+  end
+  @palette = (0..127).map do |col|
+    s1 = sin(col * Math::PI / 25)
+    s2 = sin(col * Math::PI / 50 + Math::PI / 4)
+    color(r + s1 * 128, g + s2 * 128, b + s1 * 128)
+  end
+  dim.times do |idx|
+    pixels[idx] = palette[(buffer[idx] + frame_count) & 127]
+  end
+  update_pixels
+end