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tile_map.js
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tile_map.js
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// Tile Map: Copyright (c) 2013 Matthew Parke mparke78@gmail.com
(function(){
var win = this;
var Tile = function(data){
this._data = data || null;
this.nodes = {
n: null,
e: null,
s: null,
w: null
};
};
var asTile = (function(){
function data(){ return this._data; }
function get(key){ return this._data[key]; }
function set(key, val){ return this._data[key] = val; }
function getNode(key){ return this.nodes[key]; }
function setNode(key, node){ return this.nodes[key] = node; }
function north(){ return this.nodes.n; };
function east(){ return this.nodes.e; }
function south(){ return this.nodes.s; }
function west(){ return this.nodes.w; }
// hasNext and next iterates nodes from left to right in
// the east or 'e' direction
function hasEast(){ return this.nodes.e !== null; }
function hasWest(){ return this.nodes.w !== null; }
function hasNorth(){ return this.nodes.n !== null; }
function hasSouth(){ return this.nodes.s !== null; }
return function(){
this.data = data;
this.get = get;
this.set = set;
this.getNode = getNode;
this.setNode = setNode;
this.hasNext = hasEast;
this.next = east;
this.hasPrev = hasWest;
this.prev = west;
this.hasUp = hasNorth;
this.up = north;
this.hasDown = hasSouth;
this.down = south;
};
})();
asTile.call(Tile.prototype);
var TileMap = function(xSize, data){
this.rootTile = null;
if(typeof xSize === 'number' && xSize > 0){
this.matrix = new Matrix(xSize, data);
// map calculation returns a pointer to the root
this.rootTile = this.createTiles();
}else{
throw new Error('Row size must be greater than 0.')
}
};
var asTileMap = (function(){
function createTiles(){
var mx = this.matrix.data(),
mxLen = mx.length,
rootTile = this.rootTile,
tile, mxRow;
for(var i = 0; i < mxLen; i++){
mxRow = mx[i];
// this is the left most tile in the row
tile = createTileRow(mxRow);
if(rootTile !== null){
mapRows(rootTile, tile);
}
rootTile = tile;
}
return topLeft(rootTile);
}
function createTileRow(mxRow){
var len = mxRow.length,
i = 0,
prevTile = null,
data,
tile;
for(var i = 0; i < len; i++){
tile = new Tile(mxRow[i]);
if(prevTile !== null){
//assign tile references
prevTile.setNode('e', tile);
tile.setNode('w', prevTile);
}
prevTile = tile;
}
return leftMost(tile);
}
function mapRows(topTile, bottomTile){
// map the first, then for all remaining tiles in the two rows
mapTopToBottom(topTile, bottomTile);
while(topTile.hasNext() && bottomTile.hasNext()){
topTile = topTile.next();
bottomTile = bottomTile.next();
mapTopToBottom(topTile, bottomTile);
}
}
function mapTopToBottom(topTile, bottomTile){
topTile.setNode('s', bottomTile);
bottomTile.setNode('n', topTile);
}
function root(){
return this.rootTile;
}
function size(){
return this.matrix.size();
}
function topLeft(tile){
tile = leftMost(tile);
tile = topMost(tile);
return tile;
}
function leftMost(tile){
while(tile.hasPrev()){
tile = tile.prev();
}
return tile;
}
function topMost(tile){
while(tile.hasUp()){
tile = tile.up();
}
return tile;
}
function iterateMap(tile, fn, context){
callAtContext(tile, fn, context);
while(tile.hasNext()){
tile = tile.next();
callAtContext(tile, fn, context);
}
// return to the left most
tile = leftMost(tile);
// check and iterate the next row
if(tile.hasDown()){
iterateMap(tile.down(), fn, context);
}
}
function callAtContext(tile, fn, context){
if(context){
fn.call(context, tile);
}else{
fn(tile);
}
}
function each(fn, context){
iterateMap(this.rootTile, fn, context);
}
function find(fn, context){
var result = null;
iterateMap(this.rootTile, function(tile){
if(context){
if(fn.call(context, tile)){
result = tile;
}
}else{
if(fn(tile)){
result = tile;
}
}
}, this);
return result;
}
return function(){
this.createTiles = createTiles;
this.root = root;
this.size = size;
this.topLeft = topLeft;
this.leftMost = leftMost;
this.topMost = topMost;
this.each = each;
this.find = find;
};
})();
asTileMap.call(TileMap.prototype);
win.Tile = Tile;
win.TileMap = TileMap;
}).call(this);