Snake game bug - food spawning coordination

#1

Good days, I currently have some problem with my snake game food spawning location.

Capture
Capture739×646 1.4 KB

so the picture shows that the green square (snake food), spawned at the end of the right side of the canvas. That’s a section that I coded as a restricted area, where the player loses if they went in it (or should I say the whole first and last row and column are restricted areas). While stopping the snake and resetting the game wasn’t a problem, the snake food (green square) keeps spawning inside the restricted area although I’ve specified the range of its spawn coordinate.

my code :

this.x = (Math.floor(Math.random()*((rows - 1) + 1)) + 1) * box;
this.y = (Math.floor(Math.random()*((columns - 1) + 1)) + 1) * box;

where rows = 30, columns = 30, and box=20

could anyone guide me where did I get wrong…thank you.

#2

this evaluates to rows

this.x = (Math.floor(Math.random()*rows) + 1) * box;
this.x = (Math.floor(Math.random()*((rows - 1) + 1)) + 1) * box;

I’ll give you a hint, this.x will never be 0, it should be able to be 0.

this same thing can be applied to this.y

#3

good day,
that’s the idea it can’t be 0.
The idea is that the first row, last row, first column and last column will be a restricted area.
So, the x and y can’t be 0…

#4

oh okay, my mistake didn’t read that bit. My new hint is:

this.x can evaluate to 600, it should never be able to do that.

You may already know that, but I think the brackets might have had you a bit confused, if you fix that line and work from there I think you’ll be able to get it. You’re very close.

#5

oh ok than I’ll continue to work on it. Thank you

#6

If you find that you’re still stuck I can help more. Just don’t want to help more than I need to.

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#7

oh ok I solved it thank alot
:joy:

it should be

this.x = Math.floor(Math.random() * (rows - 2) + 1) * box;
this.y = Math.floor(Math.random()* (columns - 2) + 1) *  box;
1 Like
#8