Data commit

Task/Mandelbrot-set/D/mandelbrot-set-1.d

@@ -0,0 +1,13 @@
+void main() {
+    import std.stdio, std.complex;
+
+    for (real y = -1.2; y < 1.2; y += 0.05) {
+        for (real x = -2.05; x < 0.55; x += 0.03) {
+            auto z = 0.complex;
+            foreach (_; 0 .. 100)
+                z = z ^^ 2 + complex(x, y);
+            write(z.abs < 2 ? '#' : '.');
+        }
+        writeln;
+    }
+}

Task/Mandelbrot-set/D/mandelbrot-set-2.d

@@ -0,0 +1,8 @@
+void main() {
+    import std.stdio, std.complex, std.range, std.algorithm;
+
+    foreach (immutable y; iota(-1.2, 1.2, 0.05))
+        iota(-2.05, 0.55, 0.03).map!(x => 0.complex
+            .recurrence!((a, n) => a[n - 1] ^^ 2 + complex(x, y))
+            .drop(100).front.abs < 2 ? '#' : '.').writeln;
+}

Task/Mandelbrot-set/D/mandelbrot-set-3.d

@@ -0,0 +1,27 @@
+import qd;
+
+double lensqr(cdouble c) { return c.re * c.re + c.im * c.im; }
+
+const Limit = 150;
+
+void main() {
+  screen(640, 480);
+  for (int y = 0; y < screen.h; ++y) {
+    flip; events;
+    for (int x = 0; x < screen.w; ++x) {
+      auto
+        c_x = x * 1.0 / screen.w - 0.5,
+        c_y = y * 1.0 / screen.h - 0.5,
+        c = c_y * 2.0i + c_x * 3.0 - 1.0,
+        z = 0.0i + 0.0,
+        i = 0;
+      for (; i < Limit; ++i) {
+        z = z * z + c;
+        if (lensqr(z) > 4) break;
+      }
+      auto value = cast(ubyte) (i * 255.0 / Limit);
+      pset(x, y, rgb(value, value, value));
+    }
+  }
+  while (true) { flip; events; }
+}