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Fix bound checks in flood fill (fixes #2836) (#2974)

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This commit is contained in:
Nikhil Bisht
2022-03-12 15:26:43 +05:30
committed by GitHub
parent 63637c439d
commit 260a302563
3 changed files with 175 additions and 114 deletions
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69
src/main/java/com/thealgorithms/backtracking/FloodFill.java Normal file
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package com.thealgorithms.backtracking;
/**
* Java program for Flood fill algorithm.
* @author Akshay Dubey (https://github.com/itsAkshayDubey)
*/
public class FloodFill {
/**
* Get the color at the given co-odrinates of a 2D image
*
* @param image The image to be filled
* @param x The x co-ordinate of which color is to be obtained
* @param y The y co-ordinate of which color is to be obtained
*/
public static int getPixel(int[][] image, int x, int y) {
return image[x][y];
}
/**
* Put the color at the given co-odrinates of a 2D image
*
* @param image The image to be filed
* @param x The x co-ordinate at which color is to be filled
* @param y The y co-ordinate at which color is to be filled
*/
public static void putPixel(int[][] image, int x, int y, int newColor) {
image[x][y] = newColor;
}
/**
* Fill the 2D image with new color
*
* @param image The image to be filed
* @param x The x co-ordinate at which color is to be filled
* @param y The y co-ordinate at which color is to be filled
* @param newColor The new color which to be filled in the image
* @param oldColor The old color which is to be replaced in the image
* @return
*/
public static void floodFill(int[][] image, int x, int y, int newColor, int oldColor) {
if(x < 0 || x >= image.length) return;
if(y < 0 || y >= image[x].length) return;
if(getPixel(image, x, y) != oldColor) return;
putPixel(image, x, y, newColor);
/* Recursively check for horizontally & vertically adjacent coordinates */
floodFill(image, x + 1, y, newColor, oldColor);
floodFill(image, x - 1, y, newColor, oldColor);
floodFill(image, x, y + 1, newColor, oldColor);
floodFill(image, x, y - 1, newColor, oldColor);
/* Recursively check for diagonally adjacent coordinates */
floodFill(image, x + 1, y - 1, newColor, oldColor);
floodFill(image, x - 1, y + 1, newColor, oldColor);
floodFill(image, x + 1, y + 1, newColor, oldColor);
floodFill(image, x - 1, y - 1, newColor, oldColor);
}
}