Add particle smoke effects.

OpenRA.Mods.Common/Effects/FloatingSprite.cs

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+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+using OpenRA.Effects;
+using OpenRA.Graphics;
+
+namespace OpenRA.Mods.Common.Effects
+{
+	class FloatingSprite : IEffect, ISpatiallyPartitionable
+	{
+		readonly WDist[] speed;
+		readonly WDist[] gravity;
+		readonly Animation anim;
+
+		readonly bool visibleThroughFog;
+		readonly int turnRate;
+		readonly int randomRate;
+		readonly string palette;
+
+		WPos pos;
+		WVec offset;
+		int lifetime;
+		int ticks;
+		WAngle facing;
+
+		public FloatingSprite(Actor emitter, string image, string[] sequences, string palette, bool isPlayerPalette,
+			int[] lifetime, WDist[] speed, WDist[] gravity, int turnRate, int randomRate, WPos pos, WAngle facing,
+			bool visibleThroughFog = false)
+		{
+			var world = emitter.World;
+			this.pos = pos;
+			this.turnRate = turnRate;
+			this.randomRate = randomRate;
+			this.speed = speed;
+			this.gravity = gravity;
+			this.visibleThroughFog = visibleThroughFog;
+			this.facing = facing;
+
+			anim = new Animation(world, image, () => facing);
+			anim.PlayRepeating(sequences.Random(world.LocalRandom));
+			world.ScreenMap.Add(this, pos, anim.Image);
+			this.lifetime = Util.RandomInRange(world.LocalRandom, lifetime);
+
+			this.palette = isPlayerPalette ? palette + emitter.Owner.InternalName : palette;
+		}
+
+		public void Tick(World world)
+		{
+			if (--lifetime < 0)
+			{
+				world.AddFrameEndTask(w => { w.Remove(this); w.ScreenMap.Remove(this); });
+				return;
+			}
+
+			if (--ticks < 0)
+			{
+				var forward = Util.RandomDistance(world.LocalRandom, speed).Length;
+				var height = Util.RandomDistance(world.LocalRandom, gravity).Length;
+
+				offset = new WVec(forward, 0, height);
+
+				if (turnRate > 0)
+					facing = WAngle.FromFacing(Util.NormalizeFacing(facing.Facing + world.LocalRandom.Next(-turnRate, turnRate)));
+
+				offset = offset.Rotate(WRot.FromYaw(facing));
+
+				ticks = randomRate;
+			}
+
+			anim.Tick();
+
+			pos += offset;
+
+			world.ScreenMap.Update(this, pos, anim.Image);
+		}
+
+		public IEnumerable<IRenderable> Render(WorldRenderer wr)
+		{
+			if (!visibleThroughFog && wr.World.FogObscures(pos))
+				return SpriteRenderable.None;
+
+			return anim.Render(pos, wr.Palette(palette));
+		}
+	}
+}