Add basic UI calculations

Basalt.Raylib/Components/Label.cs

@@ -0,0 +1,42 @@
+using Basalt.Common.Components;
+using Basalt.Common.Entities;
+using System.Numerics;
+
+namespace Basalt.Raylib.Components
+{
+	public class Label : UIComponent
+	{
+		public string Text { get; set; } = string.Empty;
+		public float FontSize { get; set; } = 20;
+		public float Spacing { get; set; } = 1;
+		public float Rotation { get; set; } = 0;
+		public Label(Entity entity) : base(entity)
+		{
+		}
+
+		public override void OnStart()
+		{
+
+		}
+
+		public override void OnUpdate()
+		{
+
+		}
+
+		public override void OnUIRender()
+		{
+			var position = GetPivotedPosition(new(Raylib_cs.Raylib.GetScreenWidth(), Raylib_cs.Raylib.GetScreenHeight())) + Offset;
+			var origin = new Vector2(0, 0);
+			Raylib_cs.Raylib.DrawTextPro(Raylib_cs.Raylib.GetFontDefault(),
+								Text,
+								position,
+								Raylib_cs.Raylib.MeasureTextEx(Raylib_cs.Raylib.GetFontDefault(), Text, FontSize, Spacing) / 2,
+								Rotation,
+								FontSize,
+								Spacing,
+								Raylib_cs.Color.White);
+			Engine.Instance.Logger?.LogDebug($"Drawing label at {position}");
+		}
+	}
+}

Basalt.TestField/Components/TestUiComponent.cs

@@ -0,0 +1,28 @@
+using Basalt.Common.Components;
+using Basalt.Common.Entities;
+using Raylib_cs;
+
+namespace Basalt.TestField.Components
+{
+	internal class TestUiComponent : UIComponent
+	{
+		public TestUiComponent(Entity entity) : base(entity)
+		{
+		}
+
+		public override void OnStart()
+		{
+
+		}
+
+		public override void OnUpdate()
+		{
+
+		}
+
+		public override void OnUIRender()
+		{
+			Raylib_cs.Raylib.DrawText("Hello, world!", 10, 10, 20, Color.White);
+		}
+	}
+}

Basalt.TestField/Program.cs

@@ -13,6 +13,7 @@
 using Basalt.Raylib.Input;
 using Basalt.Raylib.Utils;
 using Basalt.TestField;
+using Basalt.TestField.Components;
 using Basalt.Types;
 using Raylib_cs;
 using System.Numerics;
@@ -57,6 +58,7 @@
 player.AddComponent(new Basalt.TestField.Components.PlayerController(player));
 player.AddComponent(new LightSource(player, "lighting") { Color = Color.Red, Type = LightType.Point });
 //player.AddComponent(new TrailRenderer(player) { StartRadius = 0.5f, EndRadius = 0.1f, Color = Color.Red, TrailSegmentCount = 25, Offset = offset, TrailRefreshRate = 0.025f });
+player.AddComponent(new Label(player) { Text = "This is a test label ", Pivot = UIPivot.MiddleLeft, Offset = new(100, 25)});
 
 Engine.CreateEntity(player);
 

Basalt/Common/Components/UIComponent.cs

@@ -8,9 +8,9 @@ namespace Basalt.Common.Components
 {
 	public abstract class UIComponent : Component
 	{
-		public UIPivot Pivot { get; set; }
-		public Vector3 Offset { get; set; }
-		public Vector3 Scale { get; set; }
+		public UIPivot Pivot { get; set; } = UIPivot.TopLeft;
+		public Vector2 Offset { get; set; }
+		public float ZIndex { get; set; }
 		protected UIComponent(Entity entity) : base(entity)
 		{
 		}
@@ -37,6 +37,32 @@ private protected override void UnsubscribeFromEvents()
 			Engine.Instance.GetEngineComponent<IEventBus>()!.Unsubscribe(BasaltConstants.UiRenderEventKey, OnUIRenderEvent);
 		}
 
+		protected Vector2 GetPivotedPosition(Vector2 screenSize)
+		{
+			switch (Pivot)
+			{
+				case UIPivot.TopLeft:
+					return new Vector2(0, 0);
+				case UIPivot.TopCenter:
+					return new Vector2(screenSize.X / 2, 0);
+				case UIPivot.TopRight:
+					return new Vector2(screenSize.X, 0);
+				case UIPivot.MiddleLeft:
+					return new Vector2(0, screenSize.Y / 2);
+				case UIPivot.MiddleCenter:
+					return new Vector2(screenSize.X / 2, screenSize.Y / 2);
+				case UIPivot.MiddleRight:
+					return new Vector2(screenSize.X, screenSize.Y / 2);
+				case UIPivot.BottomLeft:
+					return new Vector2(0, screenSize.Y);
+				case UIPivot.BottomCenter:
+					return new Vector2(screenSize.X / 2, screenSize.Y);
+				case UIPivot.BottomRight:
+					return new Vector2(screenSize.X, screenSize.Y);
+				default:
+					return Vector2.Zero;
+			}
+		}
 
 	}
 }