CODEWITHSUNDEEP
javascripthtmlcanvascoffeescript
Joris Ooms
Joris Ooms

Reputation: 12048

Canvas game: My food disappears

I was watching the ThinkVitamin screencasts about building a canvas game, but it seemed the last part was missing and I had to figure out a lot of stuff myself.

I succeeded in building the game, however there are two bugs in there that keep popping up.

EDIT: MOVED THE FIRST BUG INTO ANOTHER QUESTION since this one kinda got answered!

Another bug is that the food sometimes doesn't appear. I'm clueless as to why this happens, but the only thing I can come up with is the food actually appearing inside the snake. However, I have implemented a check for this aswell and it still happens:

inSnake = (x, y) ->
    for part in Snake.position              # check if the food is being placed inside the snake
        if x == part.x && y == part.y
            true
    false

placeFood = ->
    x = Math.round Math.random() * MAX_X - 1
    y = Math.round Math.random() * MAX_Y - 1

    if inSnake x, y                                     # if so, run placeFood() again
      placeFood()   

    Food.position = { x: x, y: y }

The food should be placed randomly INSIDE my canvas (I specify MAX_X and MAX_Y), so I can only think of it being inside the snake.. I'm having trouble debugging this problem.

A demo of the application can be found here.

Thanks in advance!

Upvotes: 2

Views: 181

Answers (1)

Thilo
Thilo

Reputation: 262794

inSnake = (x, y) ->
    for part in Snake.position              
        if x == part.x && y == part.y
            true
    false

That looks like you want to say return true. Otherwise it will always run through the whole loop and return false at the end of the function.

Upvotes: 4

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