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# What made my for loop point all the lines to the centre?

edited September 2016

This isn't really a problem i'm having but i'd just like to understand better what's going on. Following the instructions in the book, i embedded two for loops into each other and gave them parametres that point the lines to centre, here's the code:

```background(0); fill(255); stroke(102); for (int y = 20; y <= height-20; y += 10) { for (int x = 20; x <= width-20; x += 10) { ellipse(x, y, 4, 4); line(x, y, 240, 60);```

Can someone please explain to me what causes the loops to point those lines from the ellipses to the centre specifically? Would just like know, thanks in advance!

Tagged:

The loops create `x` and `y` variables that increment in a grid around the screen.
Then the `line(x, y, 240, 60)` line draws a line from each `x` and `y` position to the position `240,60` which is in the middle of your screen. Try changing the size of your window to see this. Or draw a red ellipse at `240,60`. Or change that `240,60` to `mouseX, mouseY`.