Editor selection refactor pt1

OpenRA.Mods.Common/Graphics/EditorSelectionAnnotationRenderable.cs

@@ -0,0 +1,84 @@
+#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 OpenRA.Graphics;
+using OpenRA.Primitives;
+
+namespace OpenRA.Mods.Common.Graphics
+{
+	/// <summary>
+	/// Render the current editor area selection or paste region.
+	/// </summary>
+	public class EditorSelectionAnnotationRenderable : IRenderable, IFinalizedRenderable
+	{
+		readonly Color color;
+		readonly CellRegion bounds;
+		readonly int2 altPixelOffset;
+		readonly CPos? offset;
+
+		public EditorSelectionAnnotationRenderable(CellRegion bounds, Color color, int2 altPixelOffset, CPos? offset)
+		{
+			this.bounds = bounds;
+			this.color = color;
+			this.altPixelOffset = altPixelOffset;
+			this.offset = offset;
+		}
+
+		public WPos Pos => WPos.Zero;
+
+		public int ZOffset => 0;
+		public bool IsDecoration => true;
+
+		public IRenderable WithZOffset(int newOffset) { return this; }
+		public IRenderable OffsetBy(in WVec vec) { return new EditorSelectionAnnotationRenderable(bounds, color, new int2(vec.X, vec.Y), offset); }
+		public IRenderable AsDecoration() { return this; }
+
+		public IFinalizedRenderable PrepareRender(WorldRenderer wr) { return this; }
+		public void Render(WorldRenderer wr)
+		{
+			if (bounds == null)
+				return;
+
+			const int Width = 1;
+			var map = wr.World.Map;
+			var originalWPos = map.CenterOfCell(bounds.TopLeft);
+			var wposOffset = offset.HasValue ? map.CenterOfCell(offset.Value) - originalWPos : WVec.Zero;
+
+			foreach (var cellPos in bounds.CellCoords)
+			{
+				var uv = cellPos.ToMPos(map);
+				if (!map.Height.Contains(uv))
+					continue;
+
+				var ramp = map.Grid.Ramps[map.Ramp[uv]];
+				var pos = map.CenterOfCell(cellPos) - new WVec(0, 0, ramp.CenterHeightOffset);
+
+				foreach (var p in ramp.Polygons)
+				{
+					for (var i = 0; i < p.Length; i++)
+					{
+						var j = (i + 1) % p.Length;
+						var start = pos + p[i];
+						var end = pos + p[j];
+
+						Game.Renderer.RgbaColorRenderer.DrawLine(
+							wr.Viewport.WorldToViewPx(wr.ScreenPosition(start + wposOffset)) + altPixelOffset,
+							wr.Viewport.WorldToViewPx(wr.Screen3DPosition(end + wposOffset)) + altPixelOffset,
+							Width, color, color);
+					}
+				}
+			}
+		}
+
+		public void RenderDebugGeometry(WorldRenderer wr) { }
+		public Rectangle ScreenBounds(WorldRenderer wr) { return Rectangle.Empty; }
+	}
+}