Nested loops?

Programming Questions

aaminor

in Programming Questions • 6 months ago

I'm trying to draw a checkerboard that alternates black and white.

I have to use loops, so this is what I have so far:

for(int i=200; i>100; i= i-10){
rect(5, i, 10, 10);
}

So my questions are:

1. How do I change the Y value after each row is completed, so it creates multiple rows. (I'm guessing with nested loops, but I don't know how to use them.)

2. How can I alternate black and white squares in the rows?

Thanks for your help.

Replies(2)

asimes

Re: Nested loops?

6 months ago

void setup() {
size(400, 400);
int cellSize = 10;
for (int i = 0; i < width; i += cellSize) {
for (int j = 0; j < height; j += cellSize) {
if (i % (cellSize*2) == 0) {
if (j % (cellSize*2) == 0) fill(0);
else fill(255);
}
else {
if (j % (cellSize*2) == 0) fill(255);
else fill(0);
}
rect(i, j, cellSize, cellSize);
}
}
}

PhiLho

Re: Nested loops?

6 months ago

A little variant of asimes' code, to include margins, and to limit the number of cells, in case you want to make a game checkerboard.

int cellNb = 10; // Per row and column
int cellSize = 10;
int margin = 5;
void setup() {
size(400, 400);
for (int i = 0; i < cellNb; i++) {
for (int j = 0; j < cellNb; j++) {
if ((i + j) % 2 == 0)
fill(0);
else
fill(255);
rect(margin + i * cellSize, margin + j * cellSize, cellSize, cellSize);
}
}
}

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Nested loops?

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