Data commit

Task/Mandelbrot-set/Dart/mandelbrot-set.dart

@@ -0,0 +1,36 @@
+class Complex {
+  double _r,_i;
+
+  Complex(this._r,this._i);
+  double get r => _r;
+  double get i => _i;
+  String toString() => "($r,$i)";
+
+  Complex operator +(Complex other) => new Complex(r+other.r,i+other.i);
+  Complex operator *(Complex other) =>
+      new Complex(r*other.r-i*other.i,r*other.i+other.r*i);
+  double abs() => r*r+i*i;
+}
+
+void main() {
+  double start_x=-1.5;
+  double start_y=-1.0;
+  double step_x=0.03;
+  double step_y=0.1;
+
+  for(int y=0;y<20;y++) {
+    String line="";
+    for(int x=0;x<70;x++) {
+      Complex c=new Complex(start_x+step_x*x,start_y+step_y*y);
+      Complex z=new Complex(0.0, 0.0);
+      for(int i=0;i<100;i++) {
+        z=z*(z)+c;
+        if(z.abs()>2) {
+          break;
+        }
+      }
+      line+=z.abs()>2 ? " " : "*";
+    }
+    print(line);
+  }
+}