public CellSet followCorner4(Cell cell, Cell blocked) {
if (!isCorner4(cell)) return null;
CellSet result = new CellSet();
if (!cell.getNorth().equals(blocked)) result.add(cell.getNorth());
if (!cell.getEast().equals(blocked)) result.add(cell.getEast());
return result;
}
public CellSet followStub(Cell cell, Cell blocked) {
if (!isStub(cell)) return null;
CellSet result = new CellSet();
if (isBoundary(cell.getEast())) result.add(cell.getEast());
else if (isBoundary(cell.getWest())) result.add(cell.getWest());
else if (isBoundary(cell.getNorth())) result.add(cell.getNorth());
else if (isBoundary(cell.getSouth())) result.add(cell.getSouth());
if (result.contains(blocked)) result.remove(blocked);
return result;
}
/**
* Returns the neighbours of a line-cell that are boundaries (0 to 2 cells are returned)
*
* @return null if the cell is not a line
*/
public CellSet followLine(Cell cell) {
if (isHorizontalLine(cell)) {
CellSet result = new CellSet();
if (isBoundary(cell.getEast())) result.add(cell.getEast());
if (isBoundary(cell.getWest())) result.add(cell.getWest());
return result;
} else if (isVerticalLine(cell)) {
CellSet result = new CellSet();
if (isBoundary(cell.getNorth())) result.add(cell.getNorth());
if (isBoundary(cell.getSouth())) result.add(cell.getSouth());
return result;
}
return null;
}
private CellSet seedFillOld(Cell seed, char newChar) {
CellSet cellsFilled = new CellSet();
char oldChar = get(seed);
if (oldChar == newChar) return cellsFilled;
if (isOutOfBounds(seed)) return cellsFilled;
Stack<Cell> stack = new Stack<Cell>();
stack.push(seed);
while (!stack.isEmpty()) {
Cell cell = stack.pop();
set(cell, newChar);
cellsFilled.add(cell);
Cell nCell = cell.getNorth();
Cell sCell = cell.getSouth();
Cell eCell = cell.getEast();
Cell wCell = cell.getWest();
if (get(nCell) == oldChar) stack.push(nCell);
if (get(sCell) == oldChar) stack.push(sCell);
if (get(eCell) == oldChar) stack.push(eCell);
if (get(wCell) == oldChar) stack.push(wCell);
}
return cellsFilled;
}
public void replacePointMarkersOnLine() {
int width = getWidth();
int height = getHeight();
for (int yi = 0; yi < height; yi++) {
for (int xi = 0; xi < width; xi++) {
char c = get(xi, yi);
Cell cell = new Cell(xi, yi);
if (StringUtils.isOneOf(c, pointMarkers) && isStarOnLine(cell)) {
boolean isOnHorizontalLine = false;
if (StringUtils.isOneOf(get(cell.getEast()), horizontalLines)) isOnHorizontalLine = true;
if (StringUtils.isOneOf(get(cell.getWest()), horizontalLines)) isOnHorizontalLine = true;
boolean isOnVerticalLine = false;
if (StringUtils.isOneOf(get(cell.getNorth()), verticalLines)) isOnVerticalLine = true;
if (StringUtils.isOneOf(get(cell.getSouth()), verticalLines)) isOnVerticalLine = true;
if (isOnHorizontalLine && isOnVerticalLine) {
set(xi, yi, '+');
if (DEBUG) System.out.println("replaced marker on line '" + c + "' with +");
} else if (isOnHorizontalLine) {
set(xi, yi, '-');
if (DEBUG) System.out.println("replaced marker on line '" + c + "' with -");
} else if (isOnVerticalLine) {
set(xi, yi, '|');
if (DEBUG) System.out.println("replaced marker on line '" + c + "' with |");
}
}
}
}
}
public CellSet followCrossOnLine(Cell cell, Cell blocked) {
CellSet result = new CellSet();
if (isHorizontalCrossOnLine(cell)) {
result.add(cell.getEast());
result.add(cell.getWest());
} else if (isVerticalCrossOnLine(cell)) {
result.add(cell.getNorth());
result.add(cell.getSouth());
}
if (result.contains(blocked)) result.remove(blocked);
return result;
}
public CellSet followIntersection(Cell cell, Cell blocked) {
if (!isIntersection(cell)) return null;
CellSet result = new CellSet();
Cell cN = cell.getNorth();
Cell cS = cell.getSouth();
Cell cE = cell.getEast();
Cell cW = cell.getWest();
if (hasEntryPoint(cN, 6)) result.add(cN);
if (hasEntryPoint(cS, 2)) result.add(cS);
if (hasEntryPoint(cE, 8)) result.add(cE);
if (hasEntryPoint(cW, 4)) result.add(cW);
if (result.contains(blocked)) result.remove(blocked);
return result;
}
/**
* Locates and returns the '*' boundaries that we would encounter if we did a flood-fill at <code>
* seed</code>.
*/
public CellSet findBoundariesExpandingFrom(Cell seed) {
CellSet boundaries = new CellSet();
char oldChar = get(seed);
if (isOutOfBounds(seed)) return boundaries;
char newChar = 1; // TODO: kludge
Stack<Cell> stack = new Stack<Cell>();
stack.push(seed);
while (!stack.isEmpty()) {
Cell cell = stack.pop();
set(cell, newChar);
Cell nCell = cell.getNorth();
Cell sCell = cell.getSouth();
Cell eCell = cell.getEast();
Cell wCell = cell.getWest();
if (get(nCell) == oldChar) stack.push(nCell);
else if (get(nCell) == '*') boundaries.add(nCell);
if (get(sCell) == oldChar) stack.push(sCell);
else if (get(sCell) == '*') boundaries.add(sCell);
if (get(eCell) == oldChar) stack.push(eCell);
else if (get(eCell) == '*') boundaries.add(eCell);
if (get(wCell) == oldChar) stack.push(wCell);
else if (get(wCell) == '*') boundaries.add(wCell);
}
return boundaries;
}
public boolean isSouthArrowhead(Cell cell) {
return (get(cell) == 'v' || get(cell) == 'V') && isVerticalLine(cell.getNorth());
}