We are creating a program that will return a topographic map and show the user the best way to navigate the terrain without making steep climbs or descents. For the files that I am working with, I am not sure what maximum and minimum values need to be returned. The assignment is mostly complete except for 3 errors regarding an expected return value. I've submitted the primary code that we are working with and included a link to the other files the professor has given us for the assignment.
I've tried return maxValue, return minValue, return max, return min, and a few other combinations but the issue is I'm not sure if I am supposed to be returning a value from this MapDataDrawer.java file or from one of the other two files that we have to use for the assignment from the professor.
//MapDataDrawer.java
//This is the code that is returning the error
import java.util.*;
import java.io.*;
import java.awt.*;
public class MapDataDrawer
{
private int[][] grid;
public MapDataDrawer(String filename, int rows, int cols){
// initialize grid
grid = new int[rows][cols];
//read the data from the file into the grid
File dataFile = new File(filename);
try {
Scanner dataInput = new Scanner(dataFile);
for (int i=0; i<rows; i++) {
for (int j=0; j<cols;j++) {
grid[i][j] = dataInput.nextInt();
}
}
} catch (Exception e) { e.printStackTrace();}
}
/**
* @return the min value in the entire grid
*/
public int findMin() {
// Implement this method
}
/**
* @return the max value in the entire grid
*/
public int findMax(){
// Implement this method
}
/**
* @param col the column of the grid to check
* @return the index of the row with the lowest value in the given col for the grid
*/
public int indexOfMinRow(int col){
//Implement this method
}
/**
* Draws the grid using the given Graphics object.
* Colors should be grayscale values 0-255, scaled based on min/max values in grid
*/
public void drawMap(Graphics g){
int min = findMin();
int max = findMax();
for (int i=0; i<480; i++) {
for (int j=0; j<480; j++) {
int c = (255 * (grid[i][j] - min)) / (max - min);
g.setColor(new Color(c, c, c));
g.fillRect(j, i, 1, 1);
}
}
}
/**
* Find a path from West-to-East starting at given row.
* Choose a foward step out of 3 possible forward locations, using greedy method described in assignment.
* @return the total change in elevation traveled from West-to-East
*/
public int drawLowestElevPath(Graphics g, int row){
int elevChange = 0;
// Implement this method
return elevChange;
}
private int minOfThree(int a, int b, int c) {
if ((a > b) && (a > c)) return a;
if ((b > a) && (b > c)) return b;
if ((c > a) && (c > b)) return c;
return 0;
}
}
These are the professors submitted files, of which I am unsure if I am supposed to be returning some value from one of these files or from the actual homework file (MapDataDrawer.java) https://drive.google.com/drive/folders/1siRoY1K0ngptE2rL-wscXLK8Ct7Qo1hb?usp=sharing
It also includes the topographic data we are supposed to use.
As you have filled grid:
public int findMin() {
int min = Integer.MAX_VALUE;
for (int i = 0; i < grid.length; i++) {
for (int j = 0; j < grid[i].length; j++) {
int value = grid[i][j];
if (value < min) {
min = value;
}
}
}
return min;
}