[JavaFX] Flood Fill Algorithm (Recursive iteration approach)

FloodFillSample.java

public class DrawUtil {
     private static class FillParams {
        int x;

        int y;

        Color selectedColor;

        private FillParams(int x, int y, Color selectedColor) {
            this.x = x;
            this.y = y;
            this.selectedColor = selectedColor;
        }
    }
      /**
     * Flood fill algorithm. Uses the iterative approach to prevent {@link StackOverflowError}
     *
     * @param x
     *         The x-coordinate of the pixel
     * @param y
     *         The y-coordinate of the pixel
     *
     * @return The {@link FillDrawAction} containing all points of the filled surface
     */
    public static FillDrawAction floodFill(WritableImage image, int x, int y, Color newColor) {
        var pw = image.getPixelWriter();
        var pr = image.getPixelReader();

        Color selectedColor = pr.getColor(x, y);
        final Stack<FillParams> paramStack = new Stack<>();
        paramStack.push(new FillParams(x, y, selectedColor));

        FillDrawAction parentAction = getAction(true);

        if (newColor == null)
            newColor = selectedColor.equals(Color.TRANSPARENT) ? Color.BLACK : Color.TRANSPARENT;

        while (!paramStack.isEmpty()) {
            final FillParams param = paramStack.pop();

            if (param.x < 0 || param.x >= image.getWidth() || param.y < 0 || param.y >= image.getHeight())
                continue;

            Color current = pr.getColor(param.x, param.y);
            if (current.equals(newColor) || !param.selectedColor.equals(current))
                continue;

            parentAction.addChild(new FillDrawAction(param.x, param.y));
            pw.setColor(param.x, param.y, newColor);
            getCanvas().invalidate();

            paramStack.push(new FillParams(param.x - 1, param.y, selectedColor)); //West
            paramStack.push(new FillParams(param.x + 1, param.y, selectedColor)); //East
            paramStack.push(new FillParams(param.x, param.y + 1, selectedColor)); //South
            paramStack.push(new FillParams(param.x, param.y - 1, selectedColor)); //North
        }

        return parentAction;
    }
}