Version 5.0: Reworked MapBase and MapPath

MapControl/UWP/MapPath.UWP.cs

@@ -0,0 +1,86 @@
+// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
+// © 2020 Clemens Fischer
+// Licensed under the Microsoft Public License (Ms-PL)
+
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.Linq;
+using Windows.Foundation;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Media;
+using Windows.UI.Xaml.Shapes;
+
+namespace MapControl
+{
+    public partial class MapPath : Path
+    {
+        protected void DataCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
+        {
+            UpdateData();
+        }
+
+        protected void DataCollectionPropertyChanged(DependencyPropertyChangedEventArgs e)
+        {
+            INotifyCollectionChanged collection;
+
+            if ((collection = e.OldValue as INotifyCollectionChanged) != null)
+            {
+                collection.CollectionChanged -= DataCollectionChanged;
+            }
+
+            if ((collection = e.NewValue as INotifyCollectionChanged) != null)
+            {
+                collection.CollectionChanged += DataCollectionChanged;
+            }
+
+            UpdateData();
+        }
+
+        protected void AddPolylineLocations(PathFigureCollection figures, IEnumerable<Location> locations, bool closed)
+        {
+            if (locations != null && locations.Count() >= 2)
+            {
+                var points = locations.Select(loc => LocationToView(loc)).ToList();
+                if (closed)
+                {
+                    points.Add(points[0]);
+                }
+
+                var viewport = new Rect(0, 0, ParentMap.RenderSize.Width, ParentMap.RenderSize.Height);
+                PathFigure figure = null;
+                PolyLineSegment segment = null;
+
+                for (int i = 1; i < points.Count; i++)
+                {
+                    var p1 = points[i - 1];
+                    var p2 = points[i];
+                    var inside = Intersections.GetIntersections(ref p1, ref p2, viewport);
+
+                    if (inside)
+                    {
+                        if (figure == null)
+                        {
+                            figure = new PathFigure
+                            {
+                                StartPoint = p1,
+                                IsClosed = false,
+                                IsFilled = false
+                            };
+
+                            segment = new PolyLineSegment();
+                            figure.Segments.Add(segment);
+                            figures.Add(figure);
+                        }
+
+                        segment.Points.Add(p2);
+                    }
+
+                    if (!inside || p2 != points[i])
+                    {
+                        figure = null;
+                    }
+                }
+            }
+        }
+    }
+}