/** By Dingding */ private Set<Line.Segment> getRemovableLineSegments( Map<Position, Piece> pieceMap, PieceColor pieceColor) { Set<Line.Segment> removableLines = new HashSet<>(); Set<Line> linesOnTheBoard = Line.getLinesOnTheBoard( this); // Get all the possible lines on the board. Positions don't need to be occupied. for (Line line : linesOnTheBoard) { Position currentPosition = line.getStartPosition(); Position startOfSegment = null; Position endOfSegment = null; Direction direction = line.getDirection(); int consecutivePieces = 0; // We start at a dot position, so we can assume that we don't start in a set of // consecutive pieces boolean isInLineSegment = false; // Break the for-loop if an endOfSegment has been found (because the largest lines only have 7 // positions on the board, there // can't be more than one set of four pieces of the same color (requiring at least 9 // positions) on the board. for (; endOfSegment == null && isPositionOnPlayAreaOrOuterDots(currentPosition); currentPosition = currentPosition.next(direction)) { PieceColor currentPieceColor = pieceMap.containsKey(currentPosition) ? pieceMap.get(currentPosition).getPieceColor() : null; // Update the consecutivePieces if (currentPieceColor == pieceColor) consecutivePieces++; if (consecutivePieces == 4) isInLineSegment = true; if (currentPieceColor != pieceColor) consecutivePieces = 0; if (isInLineSegment) { if (isDotPosition(currentPosition) || currentPieceColor == null) { endOfSegment = currentPosition.previous(direction); } } // Update the startOfSegment if necessary if (startOfSegment == null) { if (currentPieceColor != null) { startOfSegment = currentPosition; } } if (currentPieceColor == null && endOfSegment == null) { startOfSegment = null; } // Add a line segment to the list if we have found one if (endOfSegment != null) { removableLines.add(new Line.Segment(this, startOfSegment, endOfSegment, direction)); } } } return removableLines; }