StitchATon2/Domain/GridSection.cs

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);
    }
}