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Allow path 'weighting' within AStar #79

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Allow path 'weighting' within AStar #79

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7d8a479
Allow path 'weighting' within AStar
jaycrossler Nov 11, 2015
01feae7
Merge pull request #1 from jaycrossler/astar-weighted-routing
jaycrossler Nov 11, 2015
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12 changes: 7 additions & 5 deletions src/path/astar.js
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Original file line number Diff line number Diff line change
Expand Up @@ -16,13 +16,15 @@ ROT.Path.AStar.extend(ROT.Path);
/**
* Compute a path from a given point
* @see ROT.Path#compute
* @param {function} weightingCallback Will be called for every path item and used to add weight to decisions - returning 0 means no difficulty, higher numbers add negative votes to taking a path through that cell
*/
ROT.Path.AStar.prototype.compute = function(fromX, fromY, callback) {
ROT.Path.AStar.prototype.compute = function(fromX, fromY, callback, weightingCallback) {
this._todo = [];
this._done = {};
this._fromX = fromX;
this._fromY = fromY;
this._add(this._toX, this._toY, null);
weightingCallback = weightingCallback || function(){return 0};
this._add(this._toX, this._toY, null, weightingCallback);

while (this._todo.length) {
var item = this._todo.shift();
Expand All @@ -35,7 +37,7 @@ ROT.Path.AStar.prototype.compute = function(fromX, fromY, callback) {
var y = neighbor[1];
var id = x+","+y;
if (id in this._done) { continue; }
this._add(x, y, item);
this._add(x, y, item, weightingCallback);
}
}

Expand All @@ -48,13 +50,13 @@ ROT.Path.AStar.prototype.compute = function(fromX, fromY, callback) {
}
}

ROT.Path.AStar.prototype._add = function(x, y, prev) {
ROT.Path.AStar.prototype._add = function(x, y, prev, weightingCallback) {
var obj = {
x: x,
y: y,
prev: prev,
g: (prev ? prev.g+1 : 0),
h: this._distance(x, y)
h: this._distance(x, y) + weightingCallback(x, y)
}
this._done[x+","+y] = obj;

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