Add pipe labels

PamhagenSysCtrl/Helpers/Pipeline/Pipe.cs

@@ -1,3 +1,4 @@
+using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Media;
 using System.Windows.Shapes;
@@ -7,6 +8,7 @@ namespace PamhagenSysCtrl.Helpers.Pipeline {
 
         public INode Start { get; set; }
         public INode End { get; set; }
+        public string? Label { get; set; }
         public bool IsTwoWay { get; set; }
         public bool Orientation { get; set; }
         public Brush? Highlight { get; set; }
@@ -15,11 +17,15 @@ namespace PamhagenSysCtrl.Helpers.Pipeline {
 
         private Polyline? _outer;
         private Polyline? _inner;
+        private TextBlock? _text;
         private FlowArrows? _flowArrows;
+        private double? _textOffsetX;
 
-        public Pipe(INode start, INode end, bool orientation = false, bool twoWay = false) {
+        public Pipe(INode start, INode end, string? label = null, bool orientation = false, bool twoWay = false, double? textOffsetX = null) {
             Start = start;
             End = end;
+            Label = label;
+            _textOffsetX = textOffsetX;
             Orientation = orientation;
             IsTwoWay = twoWay;
         }
@@ -49,6 +55,20 @@ namespace PamhagenSysCtrl.Helpers.Pipeline {
             };
             canvas.Children.Add(_outer);
             canvas.Children.Add(_inner);
+            if (Label != null) {
+                _text = new() {
+                    Text = Label,
+                    FontSize = 12,
+                    Width = 50,
+                    TextAlignment = TextAlignment.Center,
+                    VerticalAlignment = VerticalAlignment.Bottom,
+                    HorizontalAlignment = HorizontalAlignment.Center,
+                    SnapsToDevicePixels = true,
+                };
+                _text.SetValue(Canvas.LeftProperty, _textOffsetX != null ? (Orientation ? x2 : x1) + _textOffsetX : (Orientation ? (x2 + x3) / 2 : (x1 + x2) / 2) - 25);
+                _text.SetValue(Canvas.TopProperty, y2 - 22);
+                canvas.Children.Add(_text);
+            }
             _flowArrows = FlowArrows.Create(canvas, _inner);
         }