Implement path selection

PamhagenSysCtrl/Helpers/Pipeline/PipeJoin.cs

@@ -81,7 +81,7 @@ namespace PamhagenSysCtrl.Helpers.Pipeline {
             canvas.Children.Add(_rect);
         }
 
-        public bool Update(double x, double y) {
+        public bool Update(double x, double y, bool down) {
             var hover = Math.Abs(x - CenterX) <= SIZE / 2 && Math.Abs(y - CenterY) <= SIZE / 2;
             _rect?.Stroke = hover ? Brushes.Black : Brushes.Black;
             return hover;