init

Scripts/Elements/Dirt.cs

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+using Godot;
+
+namespace FOU.Scripts.Elements;
+
+public class Dirt : Solid {
+    public Dirt() {
+        Color = Colors.Brown;
+    }
+}

Scripts/Elements/Element.cs

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+using Godot;
+
+namespace FOU.Scripts.Elements;
+
+public abstract class Element {
+    public Color Color = Colors.Black;
+}

Scripts/Elements/Solid.cs

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+namespace FOU.Scripts.Elements;
+
+public abstract class Solid : Element {
+
+}

Scripts/Level.cs

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+using FOU.Scripts.Elements;
+using Godot;
+
+namespace FOU.Scripts;
+
+public class Level {
+    private int mSizeX;
+    private int mSizeY;
+    private Image mImage;
+
+    private Element[,] mPixels;
+
+    public Level(int x, int y) {
+        GD.Print($"Generating level ({x}:{y})");
+
+        mSizeX = x;
+        mSizeY = y;
+
+        mPixels = new Element[x, y];
+        mImage = Image.Create(mSizeX, mSizeY, false, Image.Format.Rgb8);
+        mImage.Fill(Colors.Black);
+    }
+
+    public void WritePixel(int x, int y, int size) {
+        for (int i = -size/2; i < size/2; i++) {
+            for (int j = -size/2; j < size/2; j++) {
+                int X = Mathf.Clamp(x + i, 0, mSizeX);
+                int Y = Mathf.Clamp(y + j, 0, mSizeY);
+                mPixels[X,Y] = new Dirt();
+            }
+        }
+    }
+
+    public Image DrawLevel() {
+        for (int x = 0; x < mSizeX; x++) {
+            for (int y = 0; y < mSizeY; y++) {
+                if (mPixels[x,y] == null) continue;
+
+                mImage.SetPixel(x,y, mPixels[x,y].Color);
+            }
+        }
+        return mImage;
+    }
+}

Scripts/Main.cs

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+using FOU.Scripts;
+using Godot;
+
+public partial class Main : Node2D {
+	[Export] public int BrushSize = 10;
+
+	private TextureRect mLevelDrawer;
+	private Level mLevel;
+
+	public override void _Ready() {
+		mLevel = new Level((int)GetViewportRect().Size.X, (int)GetViewportRect().Size.Y);
+		mLevelDrawer = GetNode<TextureRect>("CanvasLayer/LevelDrawer");
+	}
+
+	public override void _Process(double delta) {
+		mLevelDrawer.Texture = ImageTexture.CreateFromImage(mLevel.DrawLevel());
+	}
+
+	public override void _Input(InputEvent @event) {
+		if (@event is InputEventMouseButton eventMouseButton) {
+
+			Vector2 mouse = GetViewport().GetMousePosition();
+			mLevel.WritePixel((int)mouse.X, (int)mouse.Y, BrushSize);
+		}
+	}
+}