Data commit

Task/Julia-set/Nim/julia-set.nim

@@ -0,0 +1,31 @@
+import lenientops
+import imageman
+
+const
+  W = 800
+  H = 600
+  Zoom = 1
+  MaxIter = 255
+  MoveX = 0
+  MoveY = 0
+  Cx = -0.7
+  Cy = 0.27015
+
+var colors: array[256, ColorRGBU]
+for n in byte.low..byte.high:
+  colors[n] = ColorRGBU [n shr 5 * 36, (n shr 3 and 7) * 36, (n and 3) * 85]
+
+var image = initImage[ColorRGBU](W, H)
+
+for x in 0..<W:
+  for y in 0..<H:
+    var zx = 1.5 * (x - W / 2) / (0.5 * Zoom * W) + MoveX
+    var zy = 1.0 * (y - H / 2) / (0.5 * Zoom * H) + MoveY
+    var i = MaxIter
+    while zx * zx + zy * zy < 4 and i > 1:
+      (zy, zx) = (2.0 * zx * zy + Cy, zx * zx - zy * zy + Cx)
+      dec i
+    image[x, y] = colors[i]
+
+# Save into a PNG file.
+image.savePNG("julia.png", compression = 9)