Question

I’m a little confused with my array creation. I have a list of items with x:y co ordinates and also their dimensions (in grid sizes) … for example:

x: 1
y: 7
width: 2 tiles
height: 2 tiles

So the idea im trying to do is create an array of x:y grids that are “occupied”. But looping such data so the occupied tiles would there for be:

x: 1
y: 7
//
x: 2
y: 7
//
x: 1
y: 8
//
x: 2
y: 8

Because in the above example the item is 2 by 2 tiles ( a square ).

My object is structured like this (shown in console.log(sdata);)

7: Array[4]
0: "1"
1: "7"
2: "2"
3: "2"

So yeah im trying to make an array to store this kind of grid reference..Hope I explained what I trying to get at, but i can’t work out how to structure a loop to create the array.

Answer 1

http://jsfiddle.net/rlemon/JeeV2/ Here is an example of how you could produce this type of ‘grid’ occupied data..

var chords = [ // instead of arrays we'll use objects.. they're nicer. 
    {
    x: 1,
    y: 7,
    h: 2, // height
    w: 2}, // width
{ // ohh look a second plot point.
    x: 4,
    y: 1,
    h: 3,
    w: 2},
];

var occupied = { // will be your cells points occupied
    x: [],
    y: []    
};
chords.forEach(function(chord) { // now lets loop the chords and produce the occupied array
    occupied.x.push( chord.x );
    occupied.x.push( chord.x + (chord.w-1) ); // expand the width of the cell - initial point
    occupied.y.push( chord.y );
    occupied.y.push( chord.y + (chord.h-1) ); // expand the height of the cell - initial point
});
console.log( occupied );
// outputs
​Object
    x: Array[4]
        0: 1
        1: 2
        2: 4
        3: 5

    y: Array[4]
        0: 7
        1: 8
        2: 1
        3: 3