Wire up power bar

OpenRA.Mods.Cnc/Widgets/PowerBarWidget.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * 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. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Drawing;
+using OpenRA.Graphics;
+using OpenRA.Mods.RA.Buildings;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.RA.Widgets
+{
+	public class PowerBarWidget : Widget
+	{
+		float? lastProvidedFrac;
+		float? lastDrainedFrac;
+
+		readonly PowerManager pm;
+		[ObjectCreator.UseCtor]
+		public PowerBarWidget( [ObjectCreator.Param] World world )
+		{
+			pm = world.LocalPlayer.PlayerActor.Trait<PowerManager>();
+		}
+
+		public override void DrawInner()
+		{
+			float powerScaleBy = 100;
+			var maxPower = Math.Max(pm.PowerProvided, pm.PowerDrained);
+			while (maxPower >= powerScaleBy) powerScaleBy *= 2;
+
+			// Current power supply
+			var providedFrac = pm.PowerProvided / powerScaleBy;
+			lastProvidedFrac = providedFrac = float2.Lerp(lastProvidedFrac.GetValueOrDefault(providedFrac), providedFrac, .3f);
+
+			var color = Color.LimeGreen;
+			if (pm.PowerState == PowerState.Low)
+				color = Color.Orange;
+			if (pm.PowerState == PowerState.Critical)
+				color = Color.Red;
+			
+			var b = RenderBounds;
+			var rect = new RectangleF(Game.viewport.Location.X + b.X,
+			                          Game.viewport.Location.Y + b.Y + (1-providedFrac)*b.Height,
+			                          (float)b.Width,
+			                          providedFrac*b.Height);
+			Game.Renderer.LineRenderer.FillRect(rect, color);
+			
+			var indicator = ChromeProvider.GetImage("powerbar-bits", "indicator");
+			
+			var drainedFrac = pm.PowerDrained / powerScaleBy;
+			lastDrainedFrac = drainedFrac = float2.Lerp(lastDrainedFrac.GetValueOrDefault(drainedFrac), drainedFrac, .3f);
+			
+			float2 pos = new float2(b.X + b.Width - indicator.size.X,
+			                        b.Y + (1-drainedFrac)*b.Height - indicator.size.Y / 2);
+			
+			Game.Renderer.RgbaSpriteRenderer.DrawSprite(indicator, pos);
+		}
+	}
+}