From 4fcdd1e3e346b4fd0a81a372544def9fe1ee6c6b Mon Sep 17 00:00:00 2001
From: DomCR <DomCR@users.noreply.github.com>
Date: Mon, 25 Nov 2024 11:35:11 +0100
Subject: [PATCH] dxf true color fix

---
 .../DWG/DwgStreamWriters/DwgObjectWriter.Objects.cs   |  1 -
 .../IO/DXF/DxfStreamWriter/DxfObjectsSectionWriter.cs |  3 ++-
 .../IO/DXF/DxfStreamWriter/DxfSectionWriterBase.cs    |  6 ++++--
 .../IO/DXF/DxfStreamWriter/DxfStreamWriterBase.cs     | 11 +++++++++++
 .../IO/DXF/DxfStreamWriter/IDxfStreamWriter.cs        |  2 ++
 5 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/src/ACadSharp/IO/DWG/DwgStreamWriters/DwgObjectWriter.Objects.cs b/src/ACadSharp/IO/DWG/DwgStreamWriters/DwgObjectWriter.Objects.cs
index ced9b81d..8a1e27fa 100644
--- a/src/ACadSharp/IO/DWG/DwgStreamWriters/DwgObjectWriter.Objects.cs
+++ b/src/ACadSharp/IO/DWG/DwgStreamWriters/DwgObjectWriter.Objects.cs
@@ -113,7 +113,6 @@ private void writeBookColor(BookColor color)
 					0b11000010
 				};
 
-				//3269627904
 				uint rgb = LittleEndianConverter.Instance.ToUInt32(arr);
 
 				this._writer.WriteBitLong((int)rgb);
diff --git a/src/ACadSharp/IO/DXF/DxfStreamWriter/DxfObjectsSectionWriter.cs b/src/ACadSharp/IO/DXF/DxfStreamWriter/DxfObjectsSectionWriter.cs
index 0d885b46..d51ae536 100644
--- a/src/ACadSharp/IO/DXF/DxfStreamWriter/DxfObjectsSectionWriter.cs
+++ b/src/ACadSharp/IO/DXF/DxfStreamWriter/DxfObjectsSectionWriter.cs
@@ -1,5 +1,6 @@
 using ACadSharp.Entities;
 using ACadSharp.Objects;
+using CSUtilities.Converters;
 using System;
 using System.Linq;
 
@@ -101,7 +102,7 @@ protected void writeBookColor(BookColor color)
 			this._writer.Write(DxfCode.Subclass, DxfSubclassMarker.DbColor);
 
 			this._writer.Write(62, color.Color.GetApproxIndex());
-			this._writer.Write(420, color.Color.TrueColor);
+			this._writer.WriteTrueColor(420, color.Color);
 			this._writer.Write(430, color.Name);
 		}
 
diff --git a/src/ACadSharp/IO/DXF/DxfStreamWriter/DxfSectionWriterBase.cs b/src/ACadSharp/IO/DXF/DxfStreamWriter/DxfSectionWriterBase.cs
index bf390f69..30fca5aa 100644
--- a/src/ACadSharp/IO/DXF/DxfStreamWriter/DxfSectionWriterBase.cs
+++ b/src/ACadSharp/IO/DXF/DxfStreamWriter/DxfSectionWriterBase.cs
@@ -1,6 +1,8 @@
 using ACadSharp.Entities;
 using ACadSharp.Tables;
+using CSUtilities.Converters;
 using System;
+using System.Drawing;
 
 namespace ACadSharp.IO.DXF
 {
@@ -96,12 +98,12 @@ protected void writeCommonEntityData(Entity entity)
 			if (entity.BookColor != null)
 			{
 				this._writer.Write(62, entity.BookColor.Color.GetApproxIndex());
-				this._writer.Write(420, entity.BookColor.Color.TrueColor);
+				this._writer.WriteTrueColor(420, entity.BookColor.Color);
 				this._writer.Write(430, entity.BookColor.Name);
 			}
 			else if (entity.Color.IsTrueColor)
 			{
-				this._writer.Write(420, entity.Color.TrueColor);
+				this._writer.WriteTrueColor(420, entity.Color);
 			}
 			else
 			{
diff --git a/src/ACadSharp/IO/DXF/DxfStreamWriter/DxfStreamWriterBase.cs b/src/ACadSharp/IO/DXF/DxfStreamWriter/DxfStreamWriterBase.cs
index d996f6d4..f71f5e82 100644
--- a/src/ACadSharp/IO/DXF/DxfStreamWriter/DxfStreamWriterBase.cs
+++ b/src/ACadSharp/IO/DXF/DxfStreamWriter/DxfStreamWriterBase.cs
@@ -31,6 +31,17 @@ public void Write(int code, CSMath.IVector value, DxfClassMap map)
 			}
 		}
 
+		public void WriteTrueColor(int code, Color color, DxfClassMap map = null)
+		{
+			byte[] arr = new byte[4];
+			arr[0] = (byte)color.B;
+			arr[1] = (byte)color.G;
+			arr[2] = (byte)color.R;
+			arr[3] = 0;
+
+			this.Write(code, LittleEndianConverter.Instance.ToInt32(arr), map);
+		}
+
 		public void WriteCmColor(int code, Color color, DxfClassMap map = null)
 		{
 			if (GroupCodeValue.TransformValue(code) == GroupCodeValueType.Int16)
diff --git a/src/ACadSharp/IO/DXF/DxfStreamWriter/IDxfStreamWriter.cs b/src/ACadSharp/IO/DXF/DxfStreamWriter/IDxfStreamWriter.cs
index c0a52b8f..dd9a65c2 100644
--- a/src/ACadSharp/IO/DXF/DxfStreamWriter/IDxfStreamWriter.cs
+++ b/src/ACadSharp/IO/DXF/DxfStreamWriter/IDxfStreamWriter.cs
@@ -15,6 +15,8 @@ internal interface IDxfStreamWriter : IDisposable
 		
 		void Write(int code, IVector value, DxfClassMap map = null);
 
+		void WriteTrueColor(int code, Color color, DxfClassMap map = null);
+
 		void WriteCmColor(int code, Color color, DxfClassMap map = null);
 
 		void WriteHandle(int code, IHandledCadObject value, DxfClassMap map = null);