Initial commit

Domain/GridSection.cs

@@ -0,0 +1,51 @@
+namespace StitchATon2.Domain;
+
+public class GridSection
+{
+    public TileManager TileManager { get; }
+    
+    public int Width { get; }
+    public int Height { get; }
+    public int OffsetX { get; }
+    public int OffsetY { get; }
+
+    public Tile Origin { get; }
+
+    public GridSection(
+        TileManager tileManager,
+        string coordinatePair,
+        float cropX,
+        float cropY,
+        float cropWidth,
+        float cropHeight)
+    {
+        TileManager = tileManager;
+        var config = tileManager.Configuration;
+        
+        var (tile0, tile1) = tileManager.GetTilePair(coordinatePair);
+
+        var (col0, col1) = tile0.Column < tile1.Column
+            ? (tile0.Column, tile1.Column)
+            : (tile1.Column, tile0.Column);
+
+        var (row0, row1) = tile0.Row < tile1.Row
+            ? (tile0.Row, tile1.Row)
+            : (tile1.Row, tile0.Row);
+
+        var gridWidth = (col1 - col0 + 1) * config.Width;
+        var gridHeight = (row1 - row0 + 1) * config.Height;
+        
+        var x0 = (int)(gridWidth * cropX);
+        var y0 = (int)(gridHeight * cropY);
+        var x1 = (int)(gridWidth * (cropWidth + cropX));
+        var y1 = (int)(gridHeight * (cropHeight + cropY));
+        
+        Width = x1 - x0;
+        Height = y1 - y0;
+        
+        (var columnOffset, OffsetX) = Math.DivRem(x0, config.Width);
+        (var rowOffset, OffsetY) = Math.DivRem(y0, config.Height);
+        
+        Origin = tileManager.GetTile(col0 + columnOffset, row0 + rowOffset);
+    }
+}