Java 2D graphics backgammon table (algorithm question)

Question

My problem is I need to use only one drawLine. I couldn't figure out how am I supposed to make changes at the same time in x and y while not messing with one and another. I can't use a rectangle.

int x = 25;
int y = 25;

for (int i = 0; i <=8; i++) {
    g2d.drawLine(x, y, x+160, y);
    y+=20;
}

x = 25;
y = 25;

for (int i = 0; i <=8; i++) {
    g2d.drawLine(x, y, x, y+160);
    x+=20;
}

This is what I expected

You have to vary X and Y independently. Use a nested for loop, varying X in the outer loop and varying Y in the inner loop. — Gilbert Le Blanc
– Gilbert Le Blanc, Commented Oct 22, 2023 at 18:15
It’s a weird requirement, as the two loops are comprehensible and easy to read and that’s the most important aspect of program code. However, you can do it in a single loop, e.g. int startX = 25, startY = 25, endX = startX + 160, endY = startY + 160; for (int i = 0; i <= 17; i++) { int h = i & 1, v = h ^ 1, x = startX + v * (i>>1) * 20, y = startY + h * (i>>1) * 20; g2d.drawLine(x, y, x * v + endX * h, y * h + endY * v); } As said, I’d stick to the two loops. And well, to me, this grid doesn’t look like a backgammon board, not even remotely. — Holger
– Holger, Commented Oct 23, 2023 at 10:59
Thanks for the flowers, however, for any practical purpose, a two loops solutions stays preferable, as the single loop solution serves no other purpose than “being awesome” and solving the artificial requirement. — Holger
– Holger, Commented Oct 30, 2023 at 16:47

Muhammed Argun · Accepted Answer · 2023-10-30 18:31:35Z

0

Holger Sama's Answer (one for):

    int startX = 25,
    startY = 25,
    endX = startX + 160,
    endY = startY + 160;
for (int i = 0; i <= 17; i++) {
    int h = i & 1,
        v = h ^ 1,
        x = startX + v * (i >> 1) * 20,
        y = startY + h * (i >> 1) * 20;
    g2d.drawLine(x, y, x * v + endX * h, y * h + endY * v);
}

My Answer (nested for):

    int endy = 0, endx = 160, xIncreaser  = 0, x = 25;
for (int i = 0; i <= 9; i++){
    int y = 25;
    x+=xIncreaser;
    if (i == 1)
        x-=20;
    for (int j = 0; j <= 8; j++){
        if (y+endy>185)
            break;
        g2d.drawLine(x,y, x+endx, y+endy);
        y+=20;
    }
    xIncreaser  = 20;
    endy = 160;
    endx = 0;

edited Oct 30, 2023 at 18:31

answered Oct 30, 2023 at 18:29

Muhammed Argun

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