Merge pull request #5 from dotnet-campus/t/wzc/remove_left_top

BoundingBox2d 中删除与左右、上下有关的代码
dotnet-campus · Nov 5, 2024 · f8fc62f · f8fc62f
2 parents 06d467b + 38226b2
commit f8fc62f
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Showing 2 changed files with 60 additions and 11 deletions.
diff --git a/DotNetCampus.Numerics.Geometry/BoundingBox2D.cs b/DotNetCampus.Numerics.Geometry/BoundingBox2D.cs
@@ -35,14 +35,36 @@ public static BoundingBox2D Create(double minX, double minY, double maxX, double
     }
 
     /// <summary>
-    /// 通过左上角位置和大小创建 2 维边界框。
+    /// 通过最小坐标位置和大小创建 2 维边界框。
     /// </summary>
-    /// <param name="location">左上角位置。</param>
+    /// <param name="minPoint">最小坐标位置。</param>
     /// <param name="size">大小。</param>
     /// <returns>创建的 2 维边界框。</returns>
-    public static BoundingBox2D CreateByLocationSize(Point2D location, Size2D size)
+    public static BoundingBox2D CreateByMinPointSize(Point2D minPoint, Size2D size)
     {
-        return Create(location.X, location.Y, location.X + size.Width, location.Y + size.Height);
+        if (size.Width < 0 || size.Height < 0)
+        {
+            throw new ArgumentException("The size of the bounding box cannot be negative.");
+        }
+
+        return Create(minPoint.X, minPoint.Y, minPoint.X + size.Width, minPoint.Y + size.Height);
+    }
+
+    /// <summary>
+    /// 通过中心点和大小创建 2 维边界框。
+    /// </summary>
+    /// <param name="center"></param>
+    /// <param name="size"></param>
+    /// <returns></returns>
+    public static BoundingBox2D CreateByCenterSize(Point2D center, Size2D size)
+    {
+        if (size.Width < 0 || size.Height < 0)
+        {
+            throw new ArgumentException("The size of the bounding box cannot be negative.");
+        }
+
+        var halfSize = size / 2;
+        return new BoundingBox2D(center.X - halfSize.Width, center.Y - halfSize.Height, center.X + halfSize.Width, center.Y + halfSize.Height);
     }
 
     /// <summary>
@@ -164,6 +186,11 @@ public static BoundingBox2D TryCreate(double minX, double minY, double maxX, dou
     /// </summary>
     public double Height => MaxY - MinY;
 
+    /// <summary>
+    /// 边界框的大小。
+    /// </summary>
+    public Size2D Size => new(Width, Height);
+
     /// <summary>
     /// 边界框坐标值最小的点（MinX, MinY）。
     /// </summary>
@@ -188,11 +215,6 @@ public static BoundingBox2D TryCreate(double minX, double minY, double maxX, dou
     /// </summary>
     public BoundingBox2D()
     {
-        MinX = 0;
-        MinY = 0;
-        MaxX = 0;
-        MaxY = 0;
-
         _isNotEmpty = false;
     }
 
@@ -323,4 +345,4 @@ public BoundingBox2D Intersect(BoundingBox2D other)
     }
 
     #endregion
-}
+}
diff --git a/DotNetCampus.Numerics.Geometry/Size2D.cs b/DotNetCampus.Numerics.Geometry/Size2D.cs
@@ -5,4 +5,31 @@ namespace DotNetCampus.Numerics.Geometry;
 /// </summary>
 /// <param name="Width">宽度。</param>
 /// <param name="Height">高度。</param>
-public readonly record struct Size2D(double Width, double Height);
+public readonly record struct Size2D(double Width, double Height)
+{
+    #region 运算符重载
+
+    /// <summary>
+    /// 将大小按指定倍数进行缩放。
+    /// </summary>
+    /// <param name="size"></param>
+    /// <param name="scalar">缩放倍数。大于 1 为放大，小于 1 为缩小。</param>
+    /// <returns></returns>
+    public static Size2D operator *(Size2D size, double scalar)
+    {
+        return new Size2D(size.Width * scalar, size.Height * scalar);
+    }
+
+    /// <summary>
+    /// 将大小按指定倍数进行反向缩放。
+    /// </summary>
+    /// <param name="size"></param>
+    /// <param name="scalar">反向缩放倍数。大于 1 为缩小，小于 1 为放大。</param>
+    /// <returns></returns>
+    public static Size2D operator /(Size2D size, double scalar)
+    {
+        return new Size2D(size.Width / scalar, size.Height / scalar);
+    }
+
+    #endregion
+}