git-svn-id: svn://svn.ijw.co.nz/svn/OpenRa@2049 993157c7-ee19-0410-b2c4-bb4e9862e678

OpenRa.Game/Graphics/Viewport.cs

@@ -0,0 +1,54 @@
+using System.Collections.Generic;
+
+namespace OpenRa.Game.Graphics
+{
+	class Viewport
+	{
+		readonly float2 size;
+		readonly float2 mapSize;
+		float2 scrollPosition;
+		readonly Renderer renderer;
+
+		public float2 Location { get { return scrollPosition; } }
+		public float2 Size { get { return size; } }
+
+		public int Width { get { return (int)size.X; } }
+		public int Height { get { return (int)size.Y; } }
+
+		public void Scroll(float2 delta)
+		{
+			scrollPosition = (scrollPosition + delta).Constrain(float2.Zero, mapSize);
+		}
+
+		public Viewport(float2 size, float2 mapSize, Renderer renderer)
+		{
+			this.size = size;
+			this.mapSize = 24 * mapSize - size + new float2(128, 0);
+			this.renderer = renderer;
+		}
+
+		List<Region> regions = new List<Region>();
+		public void AddRegion(Region r)
+		{
+			regions.Add(r);
+		}
+
+		public void DrawRegions(Game game)
+		{
+			float2 r1 = new float2(2, -2) / Size;
+			float2 r2 = new float2(-1, 1);
+			
+			renderer.BeginFrame(r1, r2, scrollPosition);
+
+			foreach (Region region in regions)
+				region.Draw(renderer);
+
+			renderer.EndFrame();
+		}
+
+		public IEnumerable<Region> Regions
+		{
+			get { return regions; }
+		}
+	}
+}