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1 files changed, 82 insertions, 0 deletions

diff --git a/hoge.rb b/hoge.rb
new file mode 100644
index 0000000..4b47419
--- /dev/null
+++ b/hoge.rb
@@ -0,0 +1,82 @@
+H = 100
+W = 100
+C0 = [0] * 3
+C1 = [255] * 3
+
+I = Array.new(H) { Array.new(W) { C1.dup } }
+
+def p(y, x, c, a = 1.0)
+  y, x = y.to_i, x.to_i
+  return if x < 0 || x >= W || y < 0 || y >= H || a <= 0
+  I[y][x] = a >= 1.0 ? c : (0..2).map { (c[it] * a + I[y][x][it] * (1 - a)).round }
+end
+
+def c(cx, cy, r, c)
+  (2*r).times do |dy|
+    (2*r).times do |dx|
+      y = cy + dy - r
+      x = cx + dx - r
+      p(y, x, c) if (x-cx)**2 + (y-cy)**2 <= r**2
+    end
+  end
+end
+
+def l(y0, x0, y1, x1, c, w)
+  dy = y1 - y0
+  dx = x1 - x0
+  l = Math.hypot(dx, dy)
+  return if l == 0
+  s = (l * 2).to_i
+  (0..s).each do |i|
+    t = i.to_f / s
+    cy = y0 + dy * t
+    cx = x0 + dx * t
+    (-w..w).each do |oy|
+      (-w..w).each do |ox|
+        p(cy + oy, cx + ox, c) if ox**2 + oy**2 <= w**2
+      end
+    end
+  end
+end
+
+def r(x, y, w, h, c, a = 1)
+  h.times do |dy|
+    w.times do |dx|
+      p(y + dy, x + dx, c, a)
+    end
+  end
+end
+
+srand(42)
+
+c(H/2, W/2, 50, [255, 165, 0])
+c(H/2, W/2, 47, C1)
+c(H/2, W/2, 44, [255, 165, 0])
+
+10.times do |t|
+  u = t * Math::PI / 5
+  lx = 50 + 45 * Math.sin(u)
+  ly = 50 - 45 * Math.cos(u)
+  l(ly, lx, H/2, W/2, C1, 1)
+end
+10.times do |dy|
+  10.times do |dx|
+    x = dx * 10
+    y = dy * 10
+    next if x < W/2
+    next if (x - 45)**2 + (y - 45)**2 > 55**2
+    next if rand < 0.5
+    c = [[255, 165, 0], [255, 140, 0], [255, 215, 0], [255, 205, 114],
+         [255, 210, 127], [255, 192, 76], [255, 169, 12], [255, 228, 178]].sample
+    r(x, y, 10, 10, c, 0.75)
+  end
+end
+r(30, 35, 6, 25, C0)
+r(64, 35, 6, 25, C0)
+
+puts "P3"
+puts "#{W} #{H}"
+puts "255"
+I.each do |l|
+  puts l.map { it * " " } * " "
+end