in all its false-color glory... a working minimap for terrain

OpenRa.Game/Graphics/Minimap.cs

@@ -7,6 +7,7 @@ namespace OpenRa.Game.Graphics
 		Sheet sheet;
 		SpriteRenderer spriteRenderer;
 		Sprite sprite;
+		Bitmap terrain;
 
 		public void Tick() { }
 
@@ -17,18 +18,41 @@ namespace OpenRa.Game.Graphics
 			sprite = new Sprite(sheet, new Rectangle(0, 0, 128, 128), TextureChannel.Alpha);
 		}
 
+		// todo: extract these from the palette
+		static readonly Color[] terrainTypeColors = { 
+														Color.Green,
+														Color.Red,
+														Color.Blue,
+														Color.Yellow,
+														Color.Purple,
+														Color.Turquoise,
+														Color.Violet,
+														Color.Tomato,
+														Color.Teal,
+													};
+
 		public void Update()
 		{
-			var bitmap = new Bitmap(128, 128);
+			if (terrain == null)
+			{
+				terrain = new Bitmap(128, 128);
+				for (var y = 0; y < 128; y++)
+					for (var x = 0; x < 128; x++)
+						terrain.SetPixel(x, y, Rules.Map.IsInMap(x, y)
+							? terrainTypeColors[Rules.TileSet.GetWalkability(Rules.Map.MapTiles[x, y])]
+							: Color.Black);
+			}
+
+			var bitmap = new Bitmap(terrain);
 			
 			for( var y = 0; y < 128; y++ )
 				for (var x = 0; x < 128; x++)
 				{
-					// todo: terrain, units, perf.
+					// todo: units, perf.
 
 					var b = Game.BuildingInfluence.GetBuildingAt(new int2(x, y));
-					if (b != null && b.Owner != null)
-						bitmap.SetPixel(x, y, Chat.paletteColors[ (int)b.Owner.Palette ]);
+					if (b != null)
+						bitmap.SetPixel(x, y, b.Owner != null ? Chat.paletteColors[(int)b.Owner.Palette] : Color.Gray);
 				}
 
 			sheet.Texture.SetData(bitmap);