From 7633368a64aa2b3b2c06a021ae4296e05ca6f374 Mon Sep 17 00:00:00 2001
From: Boris <boris@workfloor.com>
Date: Fri, 8 Nov 2024 14:31:21 +0100
Subject: [PATCH] Support rotation in boundingbox

---
 GdsSharp.Lib/Extensions.cs                    |  3 ++-
 GdsSharp.Lib/GdsPoint.cs                      |  8 ++++++++
 .../Elements/GdsArrayReferenceElement.cs      | 18 ++++++++++++++++-
 .../Elements/GdsStructureReferenceElement.cs  | 20 ++++++++++++++++++-
 4 files changed, 46 insertions(+), 3 deletions(-)

diff --git a/GdsSharp.Lib/Extensions.cs b/GdsSharp.Lib/Extensions.cs
index 2b3df9e..37d31b1 100644
--- a/GdsSharp.Lib/Extensions.cs
+++ b/GdsSharp.Lib/Extensions.cs
@@ -1,10 +1,11 @@
 using System.Numerics;
-using GdsSharp.Lib.NonTerminals;
 
 namespace GdsSharp.Lib;
 
 public static class GdsExtensions
 {
+    public const float Deg2Rad = MathF.PI / 180;
+
     /// <summary>
     ///     Rotates a vector by the given angle in radians.
     /// </summary>
diff --git a/GdsSharp.Lib/GdsPoint.cs b/GdsSharp.Lib/GdsPoint.cs
index 36f8524..88401fb 100644
--- a/GdsSharp.Lib/GdsPoint.cs
+++ b/GdsSharp.Lib/GdsPoint.cs
@@ -49,4 +49,12 @@ public override string ToString()
     {
         return $"({X}, {Y})";
     }
+
+    public GdsPoint Rotate(float sin, float cos)
+    {
+        return new GdsPoint(
+            cos * X - sin * Y,
+            sin * X + cos * Y
+        );
+    }
 }
\ No newline at end of file
diff --git a/GdsSharp.Lib/NonTerminals/Elements/GdsArrayReferenceElement.cs b/GdsSharp.Lib/NonTerminals/Elements/GdsArrayReferenceElement.cs
index 6a3ad6b..e704efe 100644
--- a/GdsSharp.Lib/NonTerminals/Elements/GdsArrayReferenceElement.cs
+++ b/GdsSharp.Lib/NonTerminals/Elements/GdsArrayReferenceElement.cs
@@ -22,7 +22,23 @@ public GdsBoundingBox GetBoundingBox(GdsStructure.StructureProvider structurePro
 
         var boundingBox = structure.GetBoundingBox(structureProvider);
         if (boundingBox.IsEmpty) return boundingBox;
-        var boundingBoxes = Points.Select(p => new GdsBoundingBox(p + boundingBox.Min, p + boundingBox.Max));
+        IEnumerable<GdsBoundingBox> boundingBoxes;
+        if (Transformation.Angle != 0)
+        {
+            var (sin, cos) = MathF.SinCos((float)Transformation.Angle * GdsExtensions.Deg2Rad);
+            boundingBoxes = Points.Select(p => new GdsBoundingBox(
+                p + boundingBox.Min.Rotate(sin, cos),
+                p + boundingBox.Max.Rotate(sin, cos)
+            ));
+        }
+        else
+        {
+            boundingBoxes = Points.Select(p => new GdsBoundingBox(
+                p + boundingBox.Min,
+                p + boundingBox.Max)
+            );
+        }
+
         return new GdsBoundingBox(boundingBoxes);
     }
 }
\ No newline at end of file
diff --git a/GdsSharp.Lib/NonTerminals/Elements/GdsStructureReferenceElement.cs b/GdsSharp.Lib/NonTerminals/Elements/GdsStructureReferenceElement.cs
index 99886e6..de6ea02 100644
--- a/GdsSharp.Lib/NonTerminals/Elements/GdsStructureReferenceElement.cs
+++ b/GdsSharp.Lib/NonTerminals/Elements/GdsStructureReferenceElement.cs
@@ -4,6 +4,7 @@ namespace GdsSharp.Lib.NonTerminals.Elements;
 
 public class GdsStructureReferenceElement : IGdsElement
 {
+    private const float Deg2Rad = MathF.PI / 180;
     public required string StructureName { get; set; }
     public GdsStrans Transformation { get; set; } = new();
     public List<GdsPoint> Points { get; set; } = new();
@@ -20,7 +21,24 @@ public GdsBoundingBox GetBoundingBox(GdsStructure.StructureProvider structurePro
 
         var boundingBox = structure.GetBoundingBox(structureProvider);
         if (boundingBox.IsEmpty) return boundingBox;
-        var boundingBoxes = Points.Select(p => new GdsBoundingBox(p + boundingBox.Min, p + boundingBox.Max));
+
+        IEnumerable<GdsBoundingBox> boundingBoxes;
+        if (Transformation.Angle != 0)
+        {
+            var (sin, cos) = MathF.SinCos((float)Transformation.Angle * GdsExtensions.Deg2Rad);
+            boundingBoxes = Points.Select(p => new GdsBoundingBox(
+                p + boundingBox.Min.Rotate(sin, cos),
+                p + boundingBox.Max.Rotate(sin, cos)
+            ));
+        }
+        else
+        {
+            boundingBoxes = Points.Select(p => new GdsBoundingBox(
+                p + boundingBox.Min,
+                p + boundingBox.Max)
+            );
+        }
+
         return new GdsBoundingBox(boundingBoxes);
     }
 }
\ No newline at end of file