Draw a 4x4 Grid Java

Question

I am trying to draw a 4x4 grid using a 2D array. When I run the code, I only draw a square in the lower left corner. I think the issue might be with my y-coordinate but I am not completely sure.

StdDraw.setScale(0,4);

int[][] grid = new int[4][4];

for (int x = 0; x < grid.length; x++)
{
  for (int y = 0; y < grid[0].length; y++)
  {
    StdDraw.setPenColor(StdDraw.BLUE);
    StdDraw.filledSquare(grid[x][y], grid[x+1][y+1], 1);
  }
}

You are drawing all 16 points at the same location of `(0,0)` because `new int[4][4]` makes an array of all zeros. — OneCricketeer, Apr 12 '16 at 18:26

score 3 · Answer 1 · answered Apr 12 '16 at 18:21

3

Isn't this just because your multidimensional grid array is all 0's due to default initialization? You are drawing four squares at coord 0,0 with size 1.

answered Apr 12 '16 at 18:21

Barry

237
1
2
11

Is this an answer or a question? – Ingo Bürk Apr 12 '16 at 18:23
I'd say it's an answer, @IngoBürk. Some trivial grammar makes it look like a question, but that doesn't matter in the long run as long as it could solve the problem. – DavidS Apr 12 '16 at 18:27

score 1 · Answer 2 · answered Apr 12 '16 at 18:32

1

I got this to work:

StdDraw.setScale(0,4);

int[][] grid = new int [4][4];

for (int x = 0; x < grid.length; x++)
{
  for (int y = 0; y < grid.length; y++)
  {
    grid[x][y] = 255;
  }
}

for (int x = 0; x < grid.length; x++)
{
  for (int y = 0; y <grid.length; y++)
  {
    StdDraw.square(x, y, 1);
  }
}

answered Apr 12 '16 at 18:32

inda1

63
1
10

Good work, inda1. If Barry's answer helped you solve your problem (I think it did), consider marking his answer as correct, or upvote it or something. – DavidS Apr 12 '16 at 18:36

Draw a 4x4 Grid Java

2 Answers2