76 lines
1.7 KiB
JavaScript
76 lines
1.7 KiB
JavaScript
function CellSet(definition) {
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definition = definition || {};
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this.cells = {};
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if(definition.type == 'rectangle') {
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this.fromRectangle(definition);
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} else if(definition.type == 'isochrome') {
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this.fromIsochrome(definition);
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}
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}
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CellSet.prototype.fromRectangle = function(definition) {
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var xMax = definition.x + definition.width;
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var yMax = definition.y + definition.height;
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for(var i = definition.x; i < xMax; i++) {
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for(var j = definition.y; j < yMax; j++) {
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this.add(i, j);
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}
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}
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};
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CellSet.prototype.fromIsochrome = function(definition) {
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var originColor = definition.data[definition.x][definition.y];
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var queue = [{i: definition.x, j: definition.y}];
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while(queue.length > 0) {
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var p = queue[0];
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this.add(p.i, p.j);
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for(var d = -1; d < 2; d += 2) {
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[{i: p.i + d, j: p.j}, {i: p.i, j: p.j + d}].forEach(
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gateKeeper(this, definition.data, queue, originColor)
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);
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}
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queue.shift();
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}
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};
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CellSet.prototype.add = function(i, j) {
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this.cells[id(i, j)] = true;
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};
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CellSet.prototype.remove = function(i, j) {
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delete this.cells[id(i, j)];
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};
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CellSet.prototype.contains = function(i, j) {
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return !!this.cells[id(i, j)];
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};
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CellSet.prototype.isEmpty = function() {
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return Object.keys(this.cells).length < 1;
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};
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CellSet.prototype.iter = function(f) {
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for(var key in this.cells) {
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var coordinates = key.split(':');
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f(coordinates[0], coordinates[1]);
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}
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}
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return {
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make: function(definition) {return new CellSet(definition);},
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};
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function id(i, j) {
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return i + ':' + j;
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}
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function gateKeeper(cellSet, data, queue, originColor) {
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return function(p1) {
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if(p1.i >= 0 && p1.i < data.length && p1.j >= 0 && p1.j < data.length
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&& !cellSet.contains(p1.i, p1.j)
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&& data[p1.i][p1.j] == originColor) {
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queue.push(p1);
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}
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}
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}
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