/// <summary>
/// Takes user interface input in the form of a mouse pointer location and the containing
/// 3D viewport and attempts to "select" the piece that exists at that location. If a piece is
/// found, the appropriate game operation is performed, such as highlighting a valid source, or
/// executing a move.
/// </summary>
/// <param name="location"></param>
/// <param name="viewport"></param>
public void SelectPiece(Point location, Viewport3D viewport)
{
if (this.GameOver || this.showingOnlyPlacedPieces)
{
return;
}
ModelVisual3D hitTestResult = GameBoardController.GetHitTestResult(viewport, location);
GamePieceVisual targetPiece = GameBoardController.ConvertHitTestResultToGamePieceVisual(hitTestResult);
if (this.currentShowValidMoveOperation != null)
{
if (targetPiece != null && this.currentShowValidMoveOperation.ValidDestinationPieces.Contains(targetPiece))
{
//execute move
ExecuteMoveOperation operation = new ExecuteMoveOperation(this, this.currentShowValidMoveOperation.SourcePiece, targetPiece);
this.currentShowValidMoveOperation.Hide();
this.currentShowValidMoveOperation = null;
operation.Execute();
this.moveOperations.Add(operation);
this.BuildBoardFromMoveHistory();
this.OnMoveMade(operation);
this.CheckForEngineMove();
this.isDirty = true;
}
}
else
{
if (targetPiece != null)
{
if (targetPiece.IsValidSource)
{
this.currentShowValidMoveOperation = new ShowValidMoveOperation(this, targetPiece);
this.currentShowValidMoveOperation.Show();
}
}
}
}
/// <summary>
/// Attempts to highlight a game piece at the specified mouse pointer location.
/// </summary>
/// <remarks>
/// This method is primarily used for mouse "rollover" actions.
/// </remarks>
/// <param name="location"></param>
/// <param name="viewport"></param>
public void HighlightPiece(Point location, Viewport3D viewport)
{
if (this.GameOver || this.currentShowValidMoveOperation != null || this.showingOnlyPlacedPieces)
{
return;
}
ModelVisual3D selectedItem = GameBoardController.GetHitTestResult(viewport, location);
if (selectedItem == null)
{
if (this.highlightedPiece != null)
{
this.highlightedPiece.Highlighted = false;
}
return;
}
GamePieceVisual targetPiece = GameBoardController.ConvertHitTestResultToGamePieceVisual(selectedItem);
if (targetPiece != null)
{
if (targetPiece != this.highlightedPiece)
{
if (this.highlightedPiece != null)
{
this.highlightedPiece.Highlighted = false;
}
}
this.highlightedPiece = targetPiece;
if (targetPiece.IsValidSource)
{
this.highlightedPiece.Highlighted = true;
}
}
}