37 lines
1.0 KiB
Plaintext
37 lines
1.0 KiB
Plaintext
function MovementSystem(grid, rules) {
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var newmover = meme(MovementSystem_prototype)
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newmover.grid = grid;
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newmover.rules = rules || {}; // expects { canMove: fn }
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newmover.turn = 'white';
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return newmover
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}
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var MovementSystem_prototype = {
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tryMove: function (piece, to) {
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if (piece.colour != this.turn) return false;
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// normalise 'to' into our hybrid coord
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var dest = [!is_null(to.x) ? to.x : to[0],
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!is_null(to.y) ? to.y : to[1]];
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if (!this.grid.inBounds(dest)) return false;
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if (!this.rules.canMove(piece, piece.coord, dest, this.grid)) return false;
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var victims = this.grid.at(dest);
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if (length(victims) && victims[0].colour == piece.colour) return false;
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if (length(victims)) victims[0].captured = true;
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this.grid.remove(piece, piece.coord);
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this.grid.add (piece, dest);
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// grid.add() re-creates coord; re-add .x/.y fields:
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piece.coord.x = dest.x;
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piece.coord.y = dest.y;
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this.turn = (this.turn == 'white') ? 'black' : 'white';
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return true;
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}
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}
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return MovementSystem
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