git-svn-id: svn://svn.ijw.co.nz/svn/OpenRa@1342 993157c7-ee19-0410-b2c4-bb4e9862e678

OpenRa.Game/UiOverlay.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+
+namespace OpenRa.Game
+{
+	class UiOverlay
+	{
+		SpriteRenderer spriteRenderer;
+		Sprite buildOk;
+		Sprite buildBlocked;
+		Game game;
+
+		public UiOverlay(SpriteRenderer spriteRenderer, Game game)
+		{
+			this.spriteRenderer = spriteRenderer;
+			this.game = game;
+
+			buildOk = SynthesizeTile(0x80);
+			buildBlocked = SynthesizeTile(0xe6);
+		}
+
+		Sprite SynthesizeTile(byte paletteIndex)
+		{
+			byte[] data = new byte[24 * 24];
+
+			for (int i = 0; i < 24; i++)
+				for (int j = 0; j < 24; j++)
+					data[i * 24 + j] = ((i + j) % 4 < 2) ? (byte)0 : paletteIndex;
+
+			return SheetBuilder.Add( data, new Size(24,24) );
+		}
+
+		public void Draw()
+		{
+			spriteRenderer.DrawSprite(buildOk, new float2(48, 48), 0);
+			spriteRenderer.DrawSprite(buildBlocked, new float2(96, 48), 0);
+			spriteRenderer.Flush();
+		}
+	}
+}