From 44374a84a7d47de4860f9f4642441136f8f1138b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Simon=20L=C3=BCbe=C3=9F?= <simon.luebess@gmail.com>
Date: Sat, 11 Sep 2021 17:50:30 +0200
Subject: [PATCH] Added DrawCoordinateCross function

---
 GlitchyEngine/src/Renderer/DebugRenderer.bf | 28 ++++++++++++++++++---
 Sandbox/src/SandboxApp.bf                   |  4 +--
 2 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/GlitchyEngine/src/Renderer/DebugRenderer.bf b/GlitchyEngine/src/Renderer/DebugRenderer.bf
index 52472ca..82ff729 100644
--- a/GlitchyEngine/src/Renderer/DebugRenderer.bf
+++ b/GlitchyEngine/src/Renderer/DebugRenderer.bf
@@ -7,6 +7,8 @@ namespace GlitchyEngine.Renderer
 	public static class DebugRenderer
 	{
 		private static GeometryBinding CoordinateCross;
+		
+		public static bool DrawEntityTransforms = true;
 
 		public static void Init(GraphicsContext context)
 		{
@@ -24,7 +26,27 @@ namespace GlitchyEngine.Renderer
 			CoordinateCross.ReleaseRef();
 		}
 
-		public static bool DrawEntityTransforms = true;
+		/**
+		 * Draws a coordinate cross for the given matrix.
+		 * @param transform The transform matrix.
+		 * @param length Can be used to set a fixed length for the rendered lines that represent the axes.
+		 * 		 Set to 0 if you want transform to affect the length of the lines.
+		 */
+		public static void DrawCoordinateCross(Matrix transform, float length = 0.0f)
+		{
+			var transform;
+
+			if(length != 0.0f)
+			{
+				transform.Columns[0]..Normalize() *= length;
+				transform.Columns[1]..Normalize() *= length;
+				transform.Columns[2]..Normalize() *= length;
+			}
+
+			Renderer.DrawLine(.Zero, .Right,   .Red,  transform);
+			Renderer.DrawLine(.Zero, .Up,      .Lime, transform);
+			Renderer.DrawLine(.Zero, .Forward, .Blue, transform);
+		}
 
 		public static void Render(EcsWorld world)
 		{
@@ -32,9 +54,7 @@ namespace GlitchyEngine.Renderer
 			{
 				for(var (entity, transform) in world.Enumerate<TransformComponent>())
 				{
-					Renderer.DrawLine(.Zero, Vector3(1f, 0, 0), .Red,  transform.WorldTransform);
-					Renderer.DrawLine(.Zero, Vector3(0, 1f, 0), .Lime, transform.WorldTransform);
-					Renderer.DrawLine(.Zero, Vector3(0, 0, 1f), .Blue, transform.WorldTransform);
+					DrawCoordinateCross(transform.WorldTransform);
 				}
 			}
 		}
diff --git a/Sandbox/src/SandboxApp.bf b/Sandbox/src/SandboxApp.bf
index ca54a57..c5bb686 100644
--- a/Sandbox/src/SandboxApp.bf
+++ b/Sandbox/src/SandboxApp.bf
@@ -464,9 +464,7 @@ namespace Sandbox
 							Renderer.DrawLine(start, end, .Black, transform.WorldTransform);
 						}
 
-						Renderer.DrawLine(.Zero, Vector3(0.1f, 0, 0), .Red,  transform.WorldTransform * mat);
-						Renderer.DrawLine(.Zero, Vector3(0, 0.1f, 0), .Lime, transform.WorldTransform * mat);
-						Renderer.DrawLine(.Zero, Vector3(0, 0, 0.1f), .Blue, transform.WorldTransform * mat);
+						DebugRenderer.DrawCoordinateCross(transform.WorldTransform * mat, 2.0f);
 
 						i++;
 					}