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2013-03-18T09:37:02.913
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Generally speaking, you should have a Stack of IMapChange, where IMapChange looks something like this: <pre><code>public interface IMapChange { //Performs the change on a TileMap Boolean PerformChange(TileMap map); //Reverts the change on a TileMap Boolean RevertChange(TileMap map); } </code></pre> You should have a method that is called to make changes: <pre><code>public void SetTile(Vector2 position, int tileId) { Tile oldTile = Map.GetTile(position); Tile newTile = new Tile(position, tileId); MapChange change = new MapChange(oldTile, newTile); //Only push to cahngestacks if successfull if (change.PerformChange(Map)) { ChangeStack.Push(change); //We don't want you to be able to "redo" anymore if you do something new. RedoStack.Clear(); } } public void RemoveTile(Vector2 position) { Tile oldTile = Map.GetTile(position); Tile newTile = null; MapChange change = new MapChange(oldTile, newTile); //Only push to changestacks if successfull if (change.PerformChange(Map)) { ChangeStack.Push(change); //We don't want you to be able to "redo" anymore if you do something new. RedoStack.Clear(); } } </code></pre> Undo can look like this: <pre><code>public void Undo() { var lastChange = ChangeStack.Pop(); //Try to revert. If revert fails, put the change back in the stack if (!lastChange.RevertChange(Map)) ChangeStack.Push(lastChange); else RedoStack.Push(lastChange); } </code></pre> and undo like this: <pre><code>public void Redo() { var lastChange = RedoStack.Pop(); //Try to perform. If successfull, put back in ChangeStack if (lastChange.PerformChange(Map)) ChangeStack.Push(lastChange); else RedoStack.Push(lastChange); } </code></pre> PerformChange and RevertChange are basicly: Perform: - if oldTile is not null, try to remove it from map. - insert newTile into map. Revert: - if newTile is not null, tro to remove it from map - insert oldTile into map. 
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1. POStuck at creating undo functionality in C#/XNA Game
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1. USStig-Rune Skansgård
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1. CO+1 for explanation. Thanks, I'll see how I can use this.
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