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源代码/StgSharp/Geometries/PlainGeometry/Rectangle.cs

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+using StgSharp.Control;
+using StgSharp.Math;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StgSharp.Geometries
+{
+    public class Rectangle : Polygon4
+    {
+        internal Point center;
+
+        public override sealed Point RefPoint01=>center;
+
+        public override sealed Point RefPoint02 => vertex01;
+
+        public override sealed Point RefPoint03 => vertex02;
+
+        
+
+        /// <summary>
+        /// 计算中心点相对于参考原点的位移
+        /// </summary>
+        /// <param name="tick">当前游戏刻</param>
+        /// <returns></returns>
+        public virtual vec3d MovCenter(uint tick) => default(vec3d);
+
+        public sealed override vec3d MovVertex03(uint tick)
+        {
+            return this.center._position * 2 - this.vertex01._position;
+        }
+
+        public sealed override vec3d MovVertex04(uint tick)
+        {
+            return this.center._position * 2 - this.vertex02._position;
+        }
+
+        internal override sealed void OnRender(uint tick)
+        {
+            tick-=bornTick;
+              this.MovCenter(tick);
+        }
+
+    }
+}