1 step to working

FractalTreeGtk/CairoWindow.cs

@@ -7,13 +7,29 @@ namespace FractalTreeGtk
 {
     internal class CairoWindow : Window
     {
+        static int fractallevels = 2;
         DrawingArea drawing = new DrawingArea();
-        Fractal fractal = new Fractal();
+        Fractal fractal = new Fractal(fractallevels);
         public CairoWindow(string title) : base(title) {
             Fullscreen();
             drawing.Drawn += Drawing_Drawn;
             Add(drawing);
             ShowAll();
+            KeyPressEvent += CairoWindow_KeyPressEvent;
+        }
+
+        private void CairoWindow_KeyPressEvent(object o, KeyPressEventArgs args)
+        {
+            if(args.Event.Key == Gdk.Key.equal)
+            {
+                fractal = new Fractal(++fractallevels);
+                QueueDraw();
+            }
+            if (args.Event.Key == Gdk.Key.minus && fractallevels > 1)
+            {
+                fractal = new Fractal(--fractallevels);
+                QueueDraw();
+            }
         }
 
         private void Drawing_Drawn(object o, DrawnArgs args)
@@ -21,11 +37,12 @@ namespace FractalTreeGtk
             args.Cr.Translate(AllocatedWidth / 2, AllocatedHeight);
             Set.Context = args.Cr;
             Set.Background(new Cairo.Color(0, 0, 0));
-            foreach(CairoObjective.DrawObjects.Line[] lines in fractal.Fractallines)
+            foreach(CairoObjective.DrawObjects.Line[] lines in (CairoObjective.DrawObjects.Line[][])fractal.Fractallines)
             {
                 foreach(CairoObjective.DrawObjects.Line line in lines)
                 Line.Make(line);
             }
+            Text.Make($"Levels: {fractallevels}", -(AllocatedWidth / 2) + 50, -20, new Cairo.Color(1,1,1));
         }
     }
 }