Adjust project structure

src/Shared/HandyControl_Shared/Expression/Drawing/SimpleSegment.cs

@@ -0,0 +1,76 @@
+using System.Collections.Generic;
+using System.Windows;
+
+namespace HandyControl.Expression.Drawing
+{
+    internal class SimpleSegment
+    {
+        public enum SegmentType
+        {
+            Line,
+
+            CubicBeizer
+        }
+
+
+        private SimpleSegment()
+        {
+        }
+
+        public Point[] Points { get; private set; }
+
+        public SegmentType Type { get; private set; }
+
+        public static SimpleSegment Create(Point point0, Point point1)
+        {
+            var segment = new SimpleSegment
+            {
+                Type = SegmentType.Line,
+                Points = new[] {point0, point1}
+            };
+            return segment;
+        }
+
+        public static SimpleSegment Create(Point point0, Point point1, Point point2)
+        {
+            var point = GeometryHelper.Lerp(point0, point1, 0.66666666666666663);
+            var point3 = GeometryHelper.Lerp(point1, point2, 0.33333333333333331);
+            var segment = new SimpleSegment
+            {
+                Type = SegmentType.CubicBeizer,
+                Points = new[] {point0, point, point3, point2}
+            };
+            return segment;
+        }
+
+        public static SimpleSegment Create(Point point0, Point point1, Point point2, Point point3)
+        {
+            var segment = new SimpleSegment
+            {
+                Type = SegmentType.CubicBeizer,
+                Points = new[] {point0, point1, point2, point3}
+            };
+            return segment;
+        }
+
+        public void Flatten(IList<Point> resultPolyline, double tolerance, IList<double> resultParameters)
+        {
+            switch (Type)
+            {
+                case SegmentType.Line:
+                    resultPolyline.Add(Points[1]);
+                    if (resultParameters == null) break;
+                    resultParameters.Add(1.0);
+                    return;
+
+                case SegmentType.CubicBeizer:
+                    BezierCurveFlattener.FlattenCubic(Points, tolerance, resultPolyline, true,
+                        resultParameters);
+                    break;
+
+                default:
+                    return;
+            }
+        }
+    }
+}