49 lines
1.1 KiB
JavaScript
49 lines
1.1 KiB
JavaScript
this.Grid = (function()
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{
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function Grid(size, changeCallback)
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{
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var grid = new Array(size);
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var data = {
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grid: grid,
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size: size
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};
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this.get = function(row, col)
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{
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if (isOutOfBounds(data, row, col))
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throw new RangeError("Row or Column value out of bounds");
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return grid[row] && grid[row][col];
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}
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this.set = function(row, col, value)
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{
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if (isOutOfBounds(data, row, col))
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throw new RangeError("Row or Column value out of bounds");
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if (!grid[row])
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grid[row] = new Array(size);
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var before = grid[row][col];
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grid[row][col] = value;
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if (typeof changeCallback === "function")
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changeCallback(row, col, before, value);
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return before;
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}
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this.isOutOfBounds = isOutOfBounds.bind(this, data);
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Object.defineProperty(this, "size", {
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get: function() {return size; },
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enumerable: true
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});
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}
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function isOutOfBounds(data, row, col)
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{
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return row < 0 || row >= data.size || col < 0 || col >= data.size;
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}
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return Grid;
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})() |