Constellations/js/CellSet.js

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JavaScript
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function CellSet(definition) {
definition = definition || {};
this.cells = {};
if(definition.type == 'rectangle') {
this.fromRectangle(definition);
} else if(definition.type == 'isochrome') {
this.fromIsochrome(definition);
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} else if(definition.type == 'union') {
this.fromUnion(definition.sets);
}
}
CellSet.prototype.fromRectangle = function(definition) {
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var iMax = definition.row + definition.height;
var jMax = definition.column + definition.width;
for(var i = definition.row; i < iMax; i++) {
for(var j = definition.column; j < jMax; j++) {
this.add(i, j);
}
}
};
CellSet.prototype.fromIsochrome = function(definition) {
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var originColor = definition.data[definition.row][definition.column];
var queue = [{i: definition.row, j: definition.column}];
while(queue.length > 0) {
var p = queue[0];
this.add(p.i, p.j);
for(var d = -1; d < 2; d += 2) {
[{i: p.i + d, j: p.j}, {i: p.i, j: p.j + d}].forEach(
gateKeeper(this, definition.data, queue, originColor)
);
}
queue.shift();
}
};
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CellSet.prototype.fromUnion = function(sets) {
for(var i = 0; i < sets.length; i++) {
for(var key in sets[i].cells) {
this.cells[key] = true;
}
}
}
CellSet.prototype.add = function(i, j) {
this.cells[id(i, j)] = true;
};
CellSet.prototype.remove = function(i, j) {
delete this.cells[id(i, j)];
};
CellSet.prototype.contains = function(i, j) {
return !!this.cells[id(i, j)];
};
CellSet.prototype.isEmpty = function() {
return Object.keys(this.cells).length < 1;
};
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CellSet.prototype.map = function(f) {
var result = [];
for(var key in this.cells) {
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result.push(f.apply(null, key.split(':')));
}
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return result;
}
CellSet.prototype.iter = function(f) {
this.map(f);
}
CellSet.prototype.difference = function(cellSet) {
var newCellSet = new CellSet();
this.iter(function(i, j) {
if(!cellSet.contains(i, j)) {
newCellSet.add(i, j);
}
});
return newCellSet;
}
return {
make: function(definition) {return new CellSet(definition);},
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union: function(sets) {return new CellSet({type: 'union', sets: sets});}
};
function id(i, j) {
return i + ':' + j;
}
function gateKeeper(cellSet, data, queue, originColor) {
return function(p1) {
if(p1.i >= 0 && p1.i < data.length && p1.j >= 0 && p1.j < data.length
&& !cellSet.contains(p1.i, p1.j)
&& data[p1.i][p1.j] == originColor) {
queue.push(p1);
}
}
}