Constellations/js/Grid/Util.js

import * as Vector from Geometry.Vector;

return {
	at: at,
	column: column,
	generate: generate,
	iter: iter,
	row: row,
	set: set,
	square: square
};

function generate(width, height, f) {
	var result = [];
	for(var row = 0; row < height; row++) {
		result[row] = [];;
		for(var column = 0; column < width; column++) {
			result[row].push(f(Vector.make(row, column)));
		}
	}
	return result;
}

function iter(grid, f) {
	generate(grid.length > 0 ? grid[0].length : null, grid.length, f);
}

function square(size, value) {
	return generate(size, size, function() {return value;});
}

function at(grid, vector) {
	return grid[vector.row][vector.column];
}

function set(grid, vector, value) {
	return grid[vector.row][vector.column] = value;
}

function row(grid, n) {
	return grid[n];
}

function column(grid, n) {
	return grid.map(function(row) {return row[n];});
}