使用PointBase代替Point

AIStudio.Wpf.DiagramDesigner/Geometry/LineBase.cs

@@ -0,0 +1,43 @@
+namespace AIStudio.Wpf.DiagramDesigner.Geometry
+{
+    public struct LineBase
+    {
+        public LineBase(PointBase start, PointBase end)
+        {
+            Start = start;
+            End = end;
+        }
+
+        public PointBase Start { get; }
+        public PointBase End { get; }
+
+        public PointBase GetIntersection(LineBase line)
+        {
+            var pt1Dir = new PointBase(End.X - Start.X, End.Y - Start.Y);
+            var pt2Dir = new PointBase(line.End.X - line.Start.X, line.End.Y - line.Start.Y);
+            var det = (pt1Dir.X * pt2Dir.Y) - (pt1Dir.Y * pt2Dir.X);
+            var deltaPt = new PointBase(line.Start.X - Start.X, line.Start.Y - Start.Y);
+            var alpha = (deltaPt.X * pt2Dir.Y) - (deltaPt.Y * pt2Dir.X);
+            var beta = (deltaPt.X * pt1Dir.Y) - (deltaPt.Y * pt1Dir.X);
+
+            if (det == 0 || alpha * det < 0 || beta * det < 0)
+                return PointBase.Empty;
+
+            if (det > 0)
+            {
+                if (alpha > det || beta > det)
+                    return PointBase.Empty;
+
+            }
+            else
+            {
+                if (alpha < det || beta < det)
+                    return PointBase.Empty;
+            }
+
+            return new PointBase(Start.X + (alpha * pt1Dir.X / det), Start.Y + (alpha * pt1Dir.Y / det));
+        }
+
+        public override string ToString() => $"Line from {Start} to {End}";
+    }
+}