cleanup internal path

src/SixLabors.Shapes/InternalPath.cs

@@ -82,7 +82,7 @@ namespace SixLabors.Shapes
         /// <param name="segment">The segment.</param>
         /// <param name="isClosedPath">if set to <c>true</c> [is closed path].</param>
         internal InternalPath(ILineSegment segment, bool isClosedPath)
-            : this(segment.Flatten(), isClosedPath)
+            : this(segment?.Flatten() ?? ImmutableArray<Vector2>.Empty, isClosedPath)
         {
         }
 
@@ -105,21 +105,6 @@ namespace SixLabors.Shapes
             this.totalDistance = new Lazy<float>(this.CalculateLength);
         }
 
-        /// <summary>
-        /// Initializes a new instance of the <see cref="InternalPath" /> class.
-        /// </summary>
-        /// <param name="prototype">The prototype.</param>
-        /// <param name="isClosedPath">if set to <c>true</c> [is closed path].</param>
-        internal InternalPath(InternalPath prototype, bool isClosedPath)
-        {
-            this.points = prototype.points;
-            this.distance = prototype.distance;
-            this.calculated = prototype.calculated;
-            this.Bounds = prototype.Bounds;
-            this.closedPath = isClosedPath;
-            this.totalDistance = new Lazy<float>(this.CalculateLength);
-        }
-
         /// <summary>
         /// Gets the bounds.
         /// </summary>
@@ -210,8 +195,6 @@ namespace SixLabors.Shapes
             }
 
             int position = 0;
-            bool onCornerFirstPass = true;
-            Side lastEdgeSide = Side.Same;
             Vector2 lastPoint = MaxVector;
             int last = -1;
             for (int i = 0; i < polyCorners && count > 0; i++)
@@ -231,8 +214,8 @@ namespace SixLabors.Shapes
                         var side = SideOfLine(this.points[last], start, end);
                         if (side != Side.Same && side == SideOfLine(this.points[next], start, end))
                         {
-                            // same side we don't bohter adding the crossing
-                            position--; //move back one and the next hist will replace it
+                            // same side we don't bother adding the crossing
+                            position--; // move back one and the next hist will replace it
                             count++;
                         }
                     }