Merge pull request #6058 from wieslawsoltes/feature/PolyLineSegment

Add PolyLineSegment path segment

Author: MarchingCube

src/Avalonia.Visuals/Media/PolyLineSegment.cs

@@ -0,0 +1,61 @@
+using System.Collections.Generic;
+using Avalonia.Collections;
+
+namespace Avalonia.Media
+{
+    /// <summary>
+    /// Represents a set of line segments defined by a points collection with each Point specifying the end point of a line segment.
+    /// </summary>
+    public sealed class PolyLineSegment : PathSegment
+    {
+        /// <summary>
+        /// Defines the <see cref="Points"/> property.
+        /// </summary>
+        public static readonly StyledProperty<Points> PointsProperty
+            = AvaloniaProperty.Register<PolyLineSegment, Points>(nameof(Points));
+
+        /// <summary>
+        /// Gets or sets the points.
+        /// </summary>
+        /// <value>
+        /// The points.
+        /// </value>
+        public AvaloniaList<Point> Points
+        {
+            get => GetValue(PointsProperty);
+            set => SetValue(PointsProperty, value);
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PolyLineSegment"/> class.
+        /// </summary>
+        public PolyLineSegment()
+        {
+            Points = new Points();
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PolyLineSegment"/> class.
+        /// </summary>
+        /// <param name="points">The points.</param>
+        public PolyLineSegment(IEnumerable<Point> points) : this()
+        {
+            Points.AddRange(points);
+        }
+
+        protected internal override void ApplyTo(StreamGeometryContext ctx)
+        {
+            var points = Points;
+            if (points.Count > 0)
+            {
+                for (int i = 0; i < points.Count; i++)
+                {
+                    ctx.LineTo(points[i]);
+                }
+            }
+        }
+
+        public override string ToString()
+            => Points.Count >= 1 ? "L " + string.Join(" ", Points) : "";
+    }
+}