phaser/v3/src/gameobjects/tilemap/components/FindByIndex.js
2017-11-29 15:07:56 -06:00

71 lines
2.1 KiB
JavaScript

/**
* Searches the entire map layer for the first tile matching the given index, then returns that Tile
* object. If no match is found, it returns null. The search starts from the top-left tile and
* continues horizontally until it hits the end of the row, then it drops down to the next column.
* If the reverse boolean is true, it scans starting from the bottom-right corner traveling up to
* the top-left.
*
* @param {integer} index - The tile index value to search for.
* @param {integer} [skip=0] - The number of times to skip a matching tile before returning.
* @param {boolean} [reverse=false] - If true it will scan the layer in reverse, starting at the
* bottom-right. Otherwise it scans from the top-left.
* @param {LayerData} layer - [description]
* @return {Tile|null} The first (or n skipped) tile with the matching index.
*/
var FindByIndex = function (findIndex, skip, reverse, layer)
{
if (skip === undefined) { skip = 0; }
if (reverse === undefined) { reverse = false; }
var count = 0;
var tx;
var ty;
var tile;
if (reverse)
{
for (ty = layer.height - 1; ty >= 0; ty--)
{
for (tx = layer.width - 1; tx >= 0; tx--)
{
tile = layer.data[ty][tx];
if (tile && tile.index === findIndex)
{
if (count === skip)
{
return tile;
}
else
{
count += 1;
}
}
}
}
}
else
{
for (ty = 0; ty < layer.height; ty++)
{
for (tx = 0; tx < layer.width; tx++)
{
tile = layer.data[ty][tx];
if (tile && tile.index === findIndex)
{
if (count === skip)
{
return tile;
}
else
{
count += 1;
}
}
}
}
}
return null;
};
module.exports = FindByIndex;