Question

I have a problem with my arrays. I create them (which I’m not sure is correctly designed) but having difficulty understanding how to do checks on it.

My array is created like this:

id              = i++;
uid             = my_id;
imgwidth        = img[0].width;
imgheight       = img[0].height;
spritea[uid]    = new Array();
spritea[uid][0] = abposx;
spritea[uid][1] = abposy;
spritea[uid][2] = imgwidth;
spritea[uid][3] = imgheight;

I’m only assuming this is the correct way to store information about an image’s position and give it a unique id.

I then want to do checks on the follow example criteria:

if (x > spritea[0] && x < spritea[0]+spritea[2]){
    var uid = //get the UID of the array ;
}

But i think i have structured my array wrong? Any advice?

Answer 1

Use an object. It’s cleaner:

function create_image(id) {
    this.id = id;
    this.height = 0;
    this.width = 0;
    this.x = 0;
    this.y = 0;
}

my_image = create_image(++i);
my_image.width = img[0].width;
my_image.height = img[0].height;
my_image.x = abposx;
my_image.y = abposy;​

---

For searching, try this:

found_image = false;

for (var i = 0; i < spritea.length; i++) {
  if (spritea[i].width == 4) {
    found_image = spritea[i];
    break;
  }
}

if (found_image) {
  // found_image is your image
}