support for .NET framework 3.5

Still have bugs
2019-01-21 00:43:10 +08:00
1 parent 5878039e21
commit 7d6b491f25
@@ -0,0 +1,50 @@
+using System.Collections.Generic;
+using System.Windows;
+
+namespace HandyControl.Expression.Drawing
+{
+    internal class MarchLocation
+    {
+        public double After { get; private set; }
+
+        public double Before { get; private set; }
+
+        public int Index { get; private set; }
+
+        public double Ratio { get; private set; }
+
+        public MarchStopReason Reason { get; private set; }
+
+        public double Remain { get; private set; }
+
+        public static MarchLocation Create(MarchStopReason reason, int index, double before, double after,
+            double remain)
+        {
+            var num = before + after;
+            return new MarchLocation
+            {
+                Reason = reason,
+                Index = index,
+                Remain = remain,
+                Before = MathHelper.EnsureRange(before, 0.0, num),
+                After = MathHelper.EnsureRange(after, 0.0, num),
+                Ratio = MathHelper.EnsureRange(MathHelper.SafeDivide(before, num, 0.0), 0.0, 1.0)
+            };
+        }
+
+        public double GetArcLength(IList<double> accumulatedLengths)
+        {
+            return MathHelper.Lerp(accumulatedLengths[Index], accumulatedLengths[Index + 1], Ratio);
+        }
+
+        public Vector GetNormal(PolylineData polyline, double cornerRadius = 0.0)
+        {
+            return polyline.SmoothNormal(Index, Ratio, cornerRadius);
+        }
+
+        public Point GetPoint(IList<Point> points)
+        {
+            return GeometryHelper.Lerp(points[Index], points[Index + 1], Ratio);
+        }
+    }
+}