Added progressbar render system.

TestGame/Scenes/LevelScene.cs

@@ -46,6 +46,7 @@ protected override void CreateSystems()
                 .AddSystem(new RenderSystem(Game.SpriteBatch, Game.Camera))
                 .AddSystem(new PlantPlacementSystem(Game.SpriteBatch, Game.Camera, this))
                 .AddSystem(new PlantSystem(this));
+                //.AddSystem(new ProgressBarRenderSystem(Game.SpriteBatch, Game.Camera, Game.GraphicsDevice));
         }
 
         protected override void CreateEntities()

TestGame/Systems/PlantPlacementSystem.cs

@@ -80,9 +80,18 @@ public override void Draw(Apperance apperance, FarmPlot farmPlot, GameTime gameT
                         var plant = plantType.CreatePlant();
                         plant.FarmPlot = farmPlot;
 
+                        var progressBar = new ProgressBar()
+                        {
+                            StartValue = 0,
+                            EndValue = plant.MaxWater,
+                            CurrentValue = plant.CurrentWater,
+                            Color = Color.Blue,
+                        };
+
                         var plantEntity = CreateEntity();
                         plantEntity.Attach(plantApperance);
                         plantEntity.Attach(plant);
+                        plantEntity.Attach(progressBar);
 
                         farmPlot.Occupied = true;
                         inventory.SelectedItem.Quantity--;

TestGame/Systems/ProgressBarRenderSystem.cs

@@ -0,0 +1,63 @@
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+using TestGame.Components;
+
+namespace TestGame.Systems
+{
+    internal class ProgressBarRenderSystem : EntityDrawSystem<Apperance, ProgressBar>
+    {
+        private readonly Camera camera;
+        private readonly Texture2D texture;
+
+        public ProgressBarRenderSystem(
+            SpriteBatch spriteBatch,
+            Camera camera, 
+            GraphicsDevice device
+        ) 
+            : base(spriteBatch)
+        {
+            this.camera = camera;
+
+            texture = new Texture2D(device, 1, 1);
+            texture.SetData(new Color[] { Color.White });
+        }
+
+        public override void PreDraw(GameTime gameTime)
+            => SpriteBatch.Begin(transformMatrix: camera.GetTransform());
+
+        public override void PostDraw(GameTime gameTime)
+            => SpriteBatch.End();
+
+        public override void Draw(Apperance apperance, ProgressBar progressBar, GameTime gameTime)
+        {
+            float relativeWidth = 0.9f;
+            float relativeHeight = 0.05f;
+
+            var position = apperance.Position + new Vector2()
+            {
+                X = apperance.Size.X * (1.0f - relativeWidth),
+                Y = apperance.Size.Y * (1.0f - relativeHeight),
+            };
+            Vector2 scale = apperance.Size * new Vector2(relativeWidth, relativeHeight);
+
+            SpriteBatch.Draw(
+                texture,
+                position,
+                null,
+                progressBar.Color,
+                0,
+                Vector2.Zero,
+                scale,
+                SpriteEffects.None,
+                0
+             );
+        }
+    }
+}