Create a map preview image.

制作地图预览图。

scripts/map/MapGenerator.cs

@@ -7,6 +7,7 @@ using ColdMint.scripts.map.events;
 using ColdMint.scripts.map.interfaces;
 using ColdMint.scripts.map.LayoutParsingStrategy;
 using ColdMint.scripts.map.layoutStrategy;
+using ColdMint.scripts.map.preview;
 using ColdMint.scripts.map.room;
 using ColdMint.scripts.serialization;
 using ColdMint.scripts.utils;
@@ -338,6 +339,18 @@ public static class MapGenerator
         dictionary.Add(roomNodeDataId, roomPlacementData.NewRoom);
         LogCat.LogWithFormat("room_placement_information", LogCat.LogLabel.Default, LogCat.UploadFormat, roomNodeDataId,
             roomPlacementData.Position.ToString());
+        //Create a room preview image.
+        //创建房间预览图。
+        var rootNode = roomPlacementData.NewRoom.RootNode;
+        var image = RoomPreview.CreateImage(roomPlacementData.NewRoom.GetTileMapLayer(Config.TileMapLayerName.Ground));
+        if (rootNode != null && image != null)
+        {
+            var sprite = new Sprite2D();
+            sprite.Scale = new Vector2(10, 10);
+            sprite.Texture = image;
+            NodeUtils.CallDeferredAddChild(rootNode, sprite);
+        }
+
         return true;
     }
 }

scripts/map/preview/RoomPreview.cs

@@ -0,0 +1,70 @@
+namespace ColdMint.scripts.map.preview;
+
+using Godot;
+
+public static class RoomPreview
+{
+    /// <summary>
+    /// <para>Create Image</para>
+    /// <para>创建图像</para>
+    /// </summary>
+    /// <param name="groundTileMapLayer"></param>
+    /// <returns></returns>
+    public static ImageTexture? CreateImage(TileMapLayer? groundTileMapLayer)
+    {
+        if (groundTileMapLayer == null)
+        {
+            return null;
+        }
+
+        //Calculate the size of the image.
+        //计算图像的尺寸。
+        //The width is maxX minX and the height is maxY minY.
+        //宽度为maxX-minX，高度为maxY-minY。
+        var maxY = int.MinValue;
+        var maxX = int.MinValue;
+        var minY = int.MaxValue;
+        var minX = int.MaxValue;
+        var cellsArray = groundTileMapLayer.GetUsedCells();
+        foreach (var vector2I in cellsArray)
+        {
+            if (vector2I.Y > maxY)
+            {
+                maxY = vector2I.Y;
+            }
+
+            if (vector2I.Y < minY)
+            {
+                minY = vector2I.Y;
+            }
+
+            if (vector2I.X > maxX)
+            {
+                maxX = vector2I.X;
+            }
+
+            if (vector2I.X < minX)
+            {
+                minX = vector2I.X;
+            }
+        }
+
+        var height = maxY - minY;
+        var width = maxX - minX;
+        var offsetVector2 = Vector2I.Zero - new Vector2I(minX, minY);
+        //Create an image.
+        //创建image。
+        var image = Image.CreateEmpty(width + 1, height + 1, false, Image.Format.Rgba8);
+        //image.Fill(Colors.Green);
+        //Fill in pixels
+        //填充像素点
+        foreach (var vector2I in cellsArray)
+        {
+            image.SetPixel(vector2I.X + offsetVector2.X, vector2I.Y + offsetVector2.Y, new Color(100, 221, 23));
+        }
+
+        //Create texture.
+        //创建texture
+        return ImageTexture.CreateFromImage(image);
+    }
+}