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Add Flood Fill Algorithm Implementation (#2821)

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Co-authored-by: Andrii Siriak <siryaka@gmail.com>
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Akshay Dubey
2021-11-14 13:33:17 +05:30
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parent 4fb7470f9a
commit 1f17076571
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src/main/java/com/thealgorithms/dynamicprogramming/FloodFill.java Normal file
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package com.thealgorithms.dynamicprogramming;
/**
* 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_co_ordinate The x co-ordinate of which color is to be obtained
* @param y_co_ordinate The y co-ordinate of which color is to be obtained
*/
public static int getPixel(int[][] image, int x_co_ordinate, int y_co_ordinate) {
return image[x_co_ordinate][y_co_ordinate];
}
/**
* Put the color at the given co-odrinates of a 2D image
*
* @param image The image to be filed
* @param x_co_ordinate The x co-ordinate at which color is to be filled
* @param y_co_ordinate The y co-ordinate at which color is to be filled
*/
public static void putPixel(int[][] image, int x_co_ordinate, int y_co_ordinate, int new_color) {
image[x_co_ordinate][y_co_ordinate] = new_color;
}
/**
* Fill the 2D image with new color
*
* @param image The image to be filed
* @param x_co_ordinate The x co-ordinate at which color is to be filled
* @param y_co_ordinate The y co-ordinate at which color is to be filled
* @param new_color The new color which to be filled in the image
* @param old_color The old color which is to be replaced in the image
* @return
*/
public static void floodFill(int[][] image, int x_co_ordinate, int y_co_ordinate, int new_color, int old_color) {
if(x_co_ordinate >= 0 && y_co_ordinate >= 0 && getPixel(image, x_co_ordinate, y_co_ordinate) == old_color) {
putPixel(image, x_co_ordinate, y_co_ordinate, new_color);
floodFill(image, x_co_ordinate + 1, y_co_ordinate, new_color, old_color);
floodFill(image, x_co_ordinate - 1, y_co_ordinate, new_color, old_color);
floodFill(image, x_co_ordinate, y_co_ordinate + 1, new_color, old_color);
floodFill(image, x_co_ordinate, y_co_ordinate - 1, new_color, old_color);
floodFill(image, x_co_ordinate + 1, y_co_ordinate - 1, new_color, old_color);
floodFill(image, x_co_ordinate - 1, y_co_ordinate + 1, new_color, old_color);
floodFill(image, x_co_ordinate + 1, y_co_ordinate + 1, new_color, old_color);
floodFill(image, x_co_ordinate - 1, y_co_ordinate - 1, new_color, old_color);
}
}
/**
* This method will print the 2D image matrix
*
* @param image The image to be printed on the console
*/
public static void printImageArray(int[][] image) {
for(int i=0 ; i<image.length ; i++) {
for(int j=0 ; j<image[0].length ; j++) {
System.out.print(image[i][j]+" ");
}
System.out.println();
}
}
// Driver Program
public static void main(String[] args) {
//Input 2D image matrix
int[][] image = {
{0,0,0,0,0,0,0},
{0,3,3,3,3,0,0},
{0,3,1,1,5,0,0},
{0,3,1,1,5,5,3},
{0,3,5,5,1,1,3},
{0,0,0,5,1,1,3},
{0,0,0,3,3,3,3}
};
floodFill(image,2,2,2,1);
/* Output ==>
* 0 0 0 0 0 0 0
0 3 3 3 3 0 0
0 3 2 2 5 0 0
0 3 2 2 5 5 3
0 3 5 5 2 2 3
0 0 0 5 2 2 3
0 0 0 3 3 3 3
* */
//print 2D image matrix
printImageArray(image);
}
}