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Add Flood Fill Algorithm Implementation (#2821)
Co-authored-by: Andrii Siriak <siryaka@gmail.com>
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package com.thealgorithms.dynamicprogramming;
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/**
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* Java program for Flood fill algorithm.
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* @author Akshay Dubey (https://github.com/itsAkshayDubey)
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*/
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public class FloodFill {
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/**
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* Get the color at the given co-odrinates of a 2D image
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*
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* @param image The image to be filled
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* @param x_co_ordinate The x co-ordinate of which color is to be obtained
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* @param y_co_ordinate The y co-ordinate of which color is to be obtained
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*/
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public static int getPixel(int[][] image, int x_co_ordinate, int y_co_ordinate) {
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return image[x_co_ordinate][y_co_ordinate];
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}
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/**
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* Put the color at the given co-odrinates of a 2D image
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*
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* @param image The image to be filed
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* @param x_co_ordinate The x co-ordinate at which color is to be filled
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* @param y_co_ordinate The y co-ordinate at which color is to be filled
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*/
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public static void putPixel(int[][] image, int x_co_ordinate, int y_co_ordinate, int new_color) {
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image[x_co_ordinate][y_co_ordinate] = new_color;
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}
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/**
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* Fill the 2D image with new color
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*
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* @param image The image to be filed
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* @param x_co_ordinate The x co-ordinate at which color is to be filled
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* @param y_co_ordinate The y co-ordinate at which color is to be filled
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* @param new_color The new color which to be filled in the image
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* @param old_color The old color which is to be replaced in the image
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* @return
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*/
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public static void floodFill(int[][] image, int x_co_ordinate, int y_co_ordinate, int new_color, int old_color) {
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if(x_co_ordinate >= 0 && y_co_ordinate >= 0 && getPixel(image, x_co_ordinate, y_co_ordinate) == old_color) {
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putPixel(image, x_co_ordinate, y_co_ordinate, new_color);
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floodFill(image, x_co_ordinate + 1, y_co_ordinate, new_color, old_color);
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floodFill(image, x_co_ordinate - 1, y_co_ordinate, new_color, old_color);
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floodFill(image, x_co_ordinate, y_co_ordinate + 1, new_color, old_color);
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floodFill(image, x_co_ordinate, y_co_ordinate - 1, new_color, old_color);
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floodFill(image, x_co_ordinate + 1, y_co_ordinate - 1, new_color, old_color);
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floodFill(image, x_co_ordinate - 1, y_co_ordinate + 1, new_color, old_color);
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floodFill(image, x_co_ordinate + 1, y_co_ordinate + 1, new_color, old_color);
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floodFill(image, x_co_ordinate - 1, y_co_ordinate - 1, new_color, old_color);
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}
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}
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/**
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* This method will print the 2D image matrix
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*
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* @param image The image to be printed on the console
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*/
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public static void printImageArray(int[][] image) {
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for(int i=0 ; i<image.length ; i++) {
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for(int j=0 ; j<image[0].length ; j++) {
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System.out.print(image[i][j]+" ");
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}
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System.out.println();
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}
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}
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// Driver Program
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public static void main(String[] args) {
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//Input 2D image matrix
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int[][] image = {
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{0,0,0,0,0,0,0},
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{0,3,3,3,3,0,0},
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{0,3,1,1,5,0,0},
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{0,3,1,1,5,5,3},
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{0,3,5,5,1,1,3},
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{0,0,0,5,1,1,3},
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{0,0,0,3,3,3,3}
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};
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floodFill(image,2,2,2,1);
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/* Output ==>
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* 0 0 0 0 0 0 0
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0 3 3 3 3 0 0
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0 3 2 2 5 0 0
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0 3 2 2 5 5 3
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0 3 5 5 2 2 3
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0 0 0 5 2 2 3
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0 0 0 3 3 3 3
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* */
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//print 2D image matrix
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printImageArray(image);
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}
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}
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