Animated fire & smoke particles

Subsurface/Source/SpriteSheet.cs

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+using Microsoft.Xna.Framework;
+using System;
+using System.Xml.Linq;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace Barotrauma
+{
+    class SpriteSheet : Sprite
+    {
+        private Rectangle[] sourceRects;
+
+        public int FrameCount
+        {
+            get { return sourceRects.Length; }
+        }
+        
+        public SpriteSheet(XElement element, string path = "", string file = "")
+            : base(element, path, file)
+        {
+            int columnCount = Math.Max(ToolBox.GetAttributeInt(element, "columns", 1), 1);
+            int rowCount = Math.Max(ToolBox.GetAttributeInt(element, "rows", 1), 1);
+
+            sourceRects = new Rectangle[rowCount * columnCount];
+
+            int cellWidth = SourceRect.Width / columnCount;
+            int cellHeight = SourceRect.Height / rowCount;
+
+            for (int x = 0; x < columnCount; x++)
+            {
+                for (int y = 0; y < rowCount; y++)
+                {
+                    sourceRects[x + y * columnCount] = new Rectangle(x * cellWidth, y * cellHeight, cellWidth, cellHeight);
+                }
+            }
+
+            origin = ToolBox.GetAttributeVector2(element, "origin", new Vector2(0.5f, 0.5f));
+            origin.X = origin.X * cellWidth;
+            origin.Y = origin.Y * cellHeight;
+        }
+        
+        public override void Draw(SpriteBatch spriteBatch, Vector2 pos, Color color, Vector2 origin, float rotate, Vector2 scale, SpriteEffects spriteEffect = SpriteEffects.None, float? depth = default(float?))
+        {
+            if (texture == null) return;
+
+            spriteBatch.Draw(texture, pos + offset, sourceRects[0], color, rotation + rotate, origin, scale, spriteEffect, depth == null ? this.depth : (float)depth);
+        }
+
+        public void Draw(SpriteBatch spriteBatch, int spriteIndex, Vector2 pos, Color color, Vector2 origin, float rotate, Vector2 scale, SpriteEffects spriteEffect = SpriteEffects.None, float? depth = default(float?))
+        {
+            if (texture == null) return;
+
+            spriteBatch.Draw(texture, pos + offset, sourceRects[spriteIndex], color, rotation + rotate, origin, scale, spriteEffect, depth == null ? this.depth : (float)depth);
+        }
+    }
+}