11. Lots of dots in random positions

Creating lots of dots is not difficult. We can use arrays, as we did for the enemies, but we might prefer not to have fixed positions, but random ones.

In this case, we would create the arrays with no default values:

int amountOfDots = 100;
int[] xDot = new int[amountOfDots];
int[] yDot = new int[amountOfDots];
bool[] visible = new bool[amountOfDots];

And we would use a random number generator, to assign values from 0 to 79 for the X coordinate and from 1 to 24 for the Y coordinate:

Random randomNumberGenerator = new Random();
for(int i=0; i<amountOfDots; i++)
{
    xDot[i] = randomNumberGenerator.Next(0,80);
    yDot[i] = randomNumberGenerator.Next(1,25);
    visible[i] = true;
}
 

The other changes are barely "for" statements to get the values from the arrays:

/*
  First mini-console-game skeleton
  Version M: arrays for dots, random positions
*/
 
using System;
using System.Threading;  // For the pause with Thread.Sleep
 
public class Game01m
{
    public static void Main()
    {
        int x=40, y=12;
 
        int amountOfDots = 100;
        int[] xDot = new int[amountOfDots];
        int[] yDot = new int[amountOfDots];
        bool[] visible = new bool[amountOfDots];
 
        Random randomNumberGenerator = new Random();
        for(int i=0; i<amountOfDots; i++)
        {
            xDot[i] = randomNumberGenerator.Next(0,80);
            yDot[i] = randomNumberGenerator.Next(1,25);
            visible[i] = true;
        }
 
        int amountOfEnemies = 4;
        float[] xEnemy = { 15, 40, 50, 60 };
        float[] yEnemy = { 5, 10, 15, 20 };
        float[] incrXEnemy = { 0.4f, 0.35f, 0.6f, 0.3f };
 
        int score = 0;
        ConsoleKeyInfo userKey;
 
        // Game Loop
        while( 1 == 1 )
        {
            // Draw
            Console.Clear();
            Console.Write("Score: {0}",score);
 
            for(int i=0; i<amountOfDots; i++)
            {
                if (visible[i])
                {
                    Console.SetCursorPosition(xDot[i], yDot[i]);
                    Console.Write(".");
                }
            }
 
            Console.SetCursorPosition(x, y);
            Console.Write("C");
 
            for(int i=0; i<amountOfEnemies; i++)
            {
                Console.SetCursorPosition((int)xEnemy[i], (int)yEnemy[i]);
                Console.Write("A");
            }
 
            // Read keys and calculate new position
            if (Console.KeyAvailable)
            {
                userKey = Console.ReadKey(false);
 
                if(userKey.Key == ConsoleKey.RightArrow) x++;
                if(userKey.Key == ConsoleKey.LeftArrow) x--;
                if(userKey.Key == ConsoleKey.DownArrow) y++;
                if(userKey.Key == ConsoleKey.UpArrow) y--;
            }
 
            // Move enemies and environment
            for(int i=0; i<amountOfEnemies; i++)
            {
                xEnemy[i] += incrXEnemy[i];
                if ((xEnemy[i] < 1) || (xEnemy[i] > 78))
                    incrXEnemy[i] = -incrXEnemy[i];
            }
 
            // Collisions, lose energy or lives, etc
            for(int i=0; i<amountOfDots; i++)
                if ((x == xDot[i]) && (y == yDot[i]) && visible[i])
                {
                    score += 10;
                    visible[i] = false;
                }
 
            // Pause till next fotogram
            Thread.Sleep(40);
        }
    }
}
 

And on screen we would get: