printing 2darray as text...

SlimJimCantSwim

Hi, i've searched for a while and I'm not sure if i'm missing something obvious, i'm trying to print a 2d integer array as text, i did it before but I can't remember how i did and it is driving me insane.

thanks.

void setup() {

  size(300, 300);
  background(255);
  array();
}

void array() {

  int[][] arrayinit = {
    { 10, 5, 3, 55, 90 }, 
    {  9, 4, 2, 32, 22 }, 
    {  3, 8, 5, 79, 22 }, 
    {  3, 8, 45, 4, 2 }, 
    {  3, 22, 5, 44, 4 }
  };

  int rows = 5;
  int cols = 5;

  int[] sum = new int[cols];
  int[] sum2 = new int[rows];
  stroke(0);
  for (int c=0; c<cols; c++) { // for every column
    for (int r=0; r<rows; r++) { // for every row
      rect(40*r, 30*c, 40, 30);
      text(arrayinit[c][r], 40*r, 30*c); //dont know if this is right
      sum[c] += arrayinit[r][c]; // sum up the values per column
      sum2[r] += arrayinit[r][c];
    }
  }

  println(sum[0]); 
  println(sum[1]); 
  println(sum[2]); 
  println(sum2[2]);
  println(arrayinit[2][2]);
}

GoToLoop

From https://Forum.Processing.org/two/discussion/23471/combining-two-pieces-of-code/p2#Item_51

I've made this utility function to join a 2D String[][] array as 1 String, ready for text(): :ar!

static final String joinStrArr2d(final String[][] arr2d) {
  final StringBuilder sb = new StringBuilder();
  int outer = 0;

  for (final String[] arr1d : arr2d) {
    sb.append(ENTER);
    int inner = 0;

    for (final String item : arr1d)  sb
      .append('[').append(outer).append("][").append(inner++)
      .append("] ").append(item).append(ENTER);

    ++outer;
  }

  return sb.toString();
}

xxMrPHDxx

You are drawing both the rectangle and text. But both has white color as their fill. Even the background. So it's pretty much invisible. You could simply change your text color to solve the problem.

It will look like this:

  for (int c=0; c<cols; c++) { // for every column
    for (int r=0; r<rows; r++) { // for every row
      fill(255);
      if(c < rows-1)rect(40*r, 30*c, 40, 30);
      fill(0);
      text(arrayinit[c][r], 40*r, 30*c); //dont know if this is right
      sum[c] += arrayinit[r][c]; // sum up the values per column
      sum2[r] += arrayinit[r][c];
    }
  }

Best regards :D

Chrisir

int[][] arrayinit = {
  { 10, 5, 3, 55, 90 }, 
  {  9, 4, 2, 32, 22 }, 
  {  3, 8, 5, 79, 22 }, 
  {  3, 8, 45, 4, 2 }, 
  {  3, 22, 5, 44, 4 }
};

void setup() {
  size(300, 300);
  background(255);
  textAlign(CENTER);
}

void draw() {

  int rows = 5;
  int cols = 5;

  stroke(0);

  for (int c=0; c<cols; c++) { // for every column
    for (int r=0; r<rows; r++) { // for every row

      // draw rect
      fill(255); // white 
      rect(40*r+43, 30*c+43, 
        40, 30);

      // draw text into rect
      fill(255, 0, 0); // red 
      text(arrayinit[c][r], 
        40*r+43+20, 30*c+43+20);
    }
  }
}

SlimJimCantSwim

Thanks, as I thought it was pretty obvious.

jeremydouglass

Another alternate approach is to use a fixed-width font and print a single line-wrapped string. This will create tabular text on the screen quickly and easily using the built-in text system. However, the method is inflexible (i.e. space padding is required), and it is very sensitive to character width and line height.

jeremydouglass

Belatedly: Another option is a simple trick that uses Java Arrays.deepToString() and then reformats the output with simple search-replace rules.

import java.util.Arrays;
int[][] arrayinit = {
  {  1, 5, 3 }, 
  {  9, 4, 2 }, 
  {  3, 8, 6 }, 
};
void setup() {
  println(Arrays.deepToString(arrayinit);
  println();
  println(Arrays.deepToString(arrayinit)
    .replace("[[", "")
    .replace("], [", "\n")
    .replace("]]", "")
    .replace(" ", "  "));
}

Output:

[[1, 5, 3], [9, 4, 2], [3, 8, 6]] 

1,  5,  3
9,  4,  2
3,  8,  6

Related:

• https://stackoverflow.com/questions/19648240/java-best-way-to-print-2d-array
• https://stackoverflow.com/questions/12845208/how-to-print-two-dimensional-array-like-table