首次提交：本地项目同步到Gitea

LibShapes/Core/SelectStrategy.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+
+namespace Io.Github.Kerwinxu.LibShapes.Core
+{
+    /// <summary>
+    /// 选择策略，主要是两种，
+    /// </summary>
+    public  class SelectStrategy
+    {
+        /// <summary>
+        /// 靠近在这个范围内就算选择了。
+        /// </summary>
+        private static float tolerance = 0.5f;
+
+        /// <summary>
+        /// 两个点是否距离足够近
+        /// </summary>
+        /// <param name="p1"></param>
+        /// <param name="p2"></param>
+        /// <returns></returns>
+        public static bool isNear(PointF p1, PointF p2)
+        {
+            return Utils.DistanceCalculation.distance(p1, p2) <= tolerance;
+        }
+
+        /// <summary>
+        /// 一个点跟一个线段是否靠的非常近。
+        /// </summary>
+        /// <param name="p0"></param>
+        /// <param name="p1"></param>
+        /// <param name="p2"></param>
+        /// <returns></returns>
+        public static bool isNear(PointF p0, PointF p1, PointF p2)
+        {
+            return Utils.DistanceCalculation.pointToLine(p0, p1, p2) <= tolerance;
+        }
+    }
+}