TileBounds.cs

using System.Drawing;
 
namespace Gondwana.Drawing.Coordinates;

public static class TileBounds
{
    internal static Rectangle GetTransformedTileCandidateRange(
        Gondwana.Scenes.SceneLayer layer,
        Rectangle query,
        bool include)
    {
        if (!include || layer.TransformedTiles.Count == 0)
            return query;
 
        int width = layer.TileWidth;
        int height = layer.TileHeight;
        int spill = (Math.Abs(width - height) + 1) / 2;
 
        if (spill == 0)
            return query;
 
        if (width > height)
            query.Inflate(0, spill);
        else
            query.Inflate(spill, 0);
 
        return query;
    }

    public static Rectangle ApplyTileGeometry(Rectangle cell, Tile tile, bool include)
    {
        if (!include) return cell;
        return tile is Gondwana.Scenes.SceneLayerTile fixedTile
            ? ApplyOverhang(TileTransformGeometry.GetVisualBounds(cell, Spacing.None, fixedTile.Transform), tile.Overhang, true)
            : ApplyOverhang(cell, tile.Overhang, true);
    }
    public static Rectangle ApplyOverhang(Rectangle baseRect, Spacing oh, bool include)
    {
        if (!include || oh.IsEmpty)
            return baseRect;
 
        return Rectangle.FromLTRB(
            baseRect.Left - oh.Left,
            baseRect.Top - oh.Top,
            baseRect.Right + oh.Right,
            baseRect.Bottom + oh.Bottom
        );
    }
}