Contrail trait

OpenRA.FileFormats/PlayerColorRemap.cs

@@ -32,7 +32,7 @@ namespace OpenRA.FileFormats
 				.ToDictionary(u => u.First, u => u.Second);
 		}
 
-		static Color ColorLerp(float t, Color c1, Color c2)
+		public static Color ColorLerp(float t, Color c1, Color c2)
 		{
 			return Color.FromArgb(255,
 				(int)(t * c2.R + (1 - t) * c1.R),

OpenRA.Game/Graphics/WorldRenderer.cs

@@ -105,6 +105,12 @@ namespace OpenRA.Graphics
 				image.Sprite.DrawAt( image.Pos, this.GetPaletteIndex( image.Palette ) );
 			uiOverlay.Draw(this, world);
 
+			// added for contrails
+			foreach (var a in world.Actors)
+				if (!a.Destroyed)
+					foreach (var t in a.TraitsImplementing<IPostRender>())
+						t.RenderAfterWorld(this, a);
+
 			if (world.OrderGenerator != null)
 				world.OrderGenerator.RenderAfterWorld(this, world);
 

OpenRA.Game/Traits/TraitsInterfaces.cs

@@ -185,6 +185,8 @@ namespace OpenRA.Traits
 
 	public interface IBlocksBullets { }
 
+	public interface IPostRender { void RenderAfterWorld(WorldRenderer wr, Actor self); }
+
 	public interface IPostRenderSelection { void RenderAfterWorld(WorldRenderer wr, Actor self); }
 	public interface IPreRenderSelection { void RenderBeforeWorld(WorldRenderer wr, Actor self); }
 

OpenRA.Mods.RA/Effects/Contrail.cs

@@ -0,0 +1,109 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2010 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made 
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see LICENSE.
+ */
+#endregion
+
+using System.Collections.Generic;
+using OpenRA.Graphics;
+using OpenRA.Traits;
+using System.Drawing;
+using OpenRA.FileFormats;
+
+namespace OpenRA.Mods.RA
+{
+	class ContrailInfo : ITraitInfo
+	{
+		public readonly int[] ContrailOffset = {0, 0};
+
+		public readonly int TrailLength = 20;
+		public readonly int[] TrailColor = null;
+
+		public object Create(ActorInitializer init) { return new Contrail(init.self, this); }
+	}
+
+	class Contrail : ITick, IPostRender
+	{
+		private ContrailInfo Info = null;
+
+		private List<float2> positions = new List<float2>();
+
+		private Turret ContrailTurret = null;
+
+		private int TrailLength = 0;
+		private Color TrailColor = Color.White;
+
+		public Contrail(Actor self, ContrailInfo info)
+		{
+			Info = info;
+
+			ContrailTurret = new Turret(Info.ContrailOffset);
+
+			TrailLength = Info.TrailLength;
+
+			// if no color specified or wrong format, blend with owner color
+			if (Info.TrailColor == null || Info.TrailColor.Length != 4)
+			{
+				var ownerColor = Color.FromArgb(255, self.Owner.Color);
+				TrailColor = PlayerColorRemap.ColorLerp(0.5f, ownerColor, Color.White);
+			}
+			else
+			{
+				// otherwise, blend with specified color
+				var blendColor = Color.FromArgb(255, Info.TrailColor[1].Clamp(0, 255),
+					Info.TrailColor[2].Clamp(0, 255), Info.TrailColor[3].Clamp(0, 255));
+				TrailColor = PlayerColorRemap.ColorLerp(0.5f, blendColor, Color.White);
+			}
+		}
+
+		public void Tick(Actor self)
+		{
+			var facing = self.Trait<IFacing>();
+			var altitude = new float2(0, self.Trait<IMove>().Altitude);
+
+			float2 pos = self.CenterLocation - Combat.GetTurretPosition(self, facing, ContrailTurret) - altitude;
+		
+			positions.Add(pos);
+
+			if (positions.Count >= TrailLength)
+			{
+				positions.RemoveAt(0);
+			}
+		}
+
+		public void RenderAfterWorld(WorldRenderer wr, Actor self)
+		{
+			Color trailStart = TrailColor;
+			Color trailEnd = Color.FromArgb(trailStart.A - 255 / TrailLength, trailStart.R,
+											trailStart.G, trailStart.B);
+
+			for (int i = positions.Count - 1; i >= 1; --i)
+			{
+				var conPos = positions[i];
+				var nextPos = positions[i - 1];
+				ShroudRenderer shroud = null;
+
+				// LocalPlayer is null on shellmap
+				if (self.World.LocalPlayer != null)
+				{
+					shroud = self.World.LocalPlayer.Shroud;
+				}
+
+				if (shroud == null ||
+					shroud.IsVisible(OpenRA.Traits.Util.CellContaining(conPos)) ||
+					shroud.IsVisible(OpenRA.Traits.Util.CellContaining(nextPos)))
+				{
+					Game.Renderer.LineRenderer.DrawLine(conPos, nextPos, trailStart, trailEnd);
+
+					trailStart = trailEnd;
+					trailEnd = Color.FromArgb(trailStart.A - 255 / positions.Count, trailStart.R,
+												trailStart.G, trailStart.B);
+				}
+			}
+		}
+	}
+}

OpenRA.Mods.RA/OpenRA.Mods.RA.csproj

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProductVersion>9.0.30729</ProductVersion>
+    <ProductVersion>9.0.21022</ProductVersion>
     <SchemaVersion>2.0</SchemaVersion>
     <ProjectGuid>{4A8A43B5-A9EF-4ED0-99DD-4BAB10A0DB6E}</ProjectGuid>
     <OutputType>Library</OutputType>
@@ -89,6 +89,7 @@
     <Compile Include="Crates\GiveUnitCrateAction.cs" />
     <Compile Include="DetectCloaked.cs" />
     <Compile Include="Effects\Bullet.cs" />
+    <Compile Include="Effects\Contrail.cs" />
     <Compile Include="Effects\Explosion.cs" />
     <Compile Include="Effects\GravityBomb.cs" />
     <Compile Include="Effects\LaserZap.cs" />

mods/ra/rules/vehicles.yaml

@@ -19,6 +19,10 @@ BADR:
 	-GainsExperience:
 	Tooltip:
 		Name: Badger
+	Contrail@1:
+		ContrailOffset: 11, -11
+	Contrail@2:
+		ContrailOffset: -11, -11
 
 BADR.bomber:
 	CarpetBomb:
@@ -42,6 +46,10 @@ BADR.bomber:
 	-GainsExperience:
 	Tooltip:
 		Name: Badger
+	Contrail@1:
+		ContrailOffset: 11, -11
+	Contrail@2:
+		ContrailOffset: -11, -11
 
 V2RL:
 	Inherits: ^Vehicle
@@ -707,6 +715,10 @@ MIG:
 	ReturnOnIdle:
 	Selectable:
 		Bounds: 44,40,0,0
+	Contrail@1:
+		ContrailOffset: 16,-14
+	Contrail@2:
+		ContrailOffset: -16,-14
 
 YAK:
 	Inherits: ^Plane
@@ -745,6 +757,8 @@ YAK:
 	IronCurtainable:
 	ReturnOnIdle:
 	WithMuzzleFlash:
+	Contrail:
+		ContrailOffset: 0, -20
 
 TRAN:
 	Inherits: ^Plane
@@ -776,7 +790,7 @@ TRAN:
 	WithShadow:
 	Cargo:
 		Types: Infantry
-		Passengers: 5
+		Passengers: 5
 	IronCurtainable:
 	FallsToEarth:
 
@@ -873,6 +887,10 @@ U2:
 	IronCurtainable:
 	-Selectable:
 	-GainsExperience:
+	Contrail@1:
+		ContrailOffset: 16, -17
+	Contrail@2:
+		ContrailOffset: -16, -17
 
 1TNK.Husk:
 	Inherits: ^Husk