feat(Hintergrund): Locate add, um die Position des Hintergrunds anhand anderer Anmerkungen zu berechnen.

- Standort des Hintergrunds zu Anmerkungen hinzugefügt

EnvelopeGenerator.Web/Models/Annotation/Background.cs

@@ -20,4 +20,29 @@ public record Background : IAnnotation
     public double Left { get; set; }
 
     public double Top { get; set; }
+
+    public void Locate(IEnumerable<IAnnotation> annotations)
+    {
+        // set Top
+        if (annotations.MinBy(a => a.Top)?.Top is double minTop)
+            Top = minTop;
+
+        // set Left
+        if (annotations.MinBy(a => a.Left)?.Left is double minLeft)
+            Left = minLeft;
+
+        // set Width
+        if(annotations.MaxBy(a => a.GetRight())?.GetRight() is double maxRight)
+            Width = maxRight - Left;
+
+        // set Height
+        if (annotations.MaxBy(a => a.GetBottom())?.GetBottom() is double maxBottom)
+            Height = maxBottom - Top;
+
+        // add margins
+        Top -= Margin;
+        Left -= Margin;
+        Width += Margin * 2;
+        Height += Margin * 2;
+    }
 }