Zelda BOTW Part 1: Navigation

keyboardNavigation.ts

const COLUMNS_NUMBER = 5;
const ROWS_NUMBER = 4;

type PositionType = {
  x: number;
  y: number;
};

const getMatrixPositionFromIndex = (index: number): PositionType => {
  const rowIndex = Math.floor(index / COLUMNS_NUMBER);
  const columnIndex = index % COLUMNS_NUMBER;
  return { x: rowIndex, y: columnIndex };
};

const getIndexFromMaxtrixPosition = (matrixPosition: PositionType): number => {
  return matrixPosition.x * COLUMNS_NUMBER + matrixPosition.y;
};

const goUp = (position: PositionType) => ({
  x: Math.max(position.x - 1, 0),
  y: position.y,
});
const goDown = (position: PositionType) => ({
  x: Math.min(position.x + 1, ROWS_NUMBER - 1),
  y: position.y,
});
const goLeft = (position: PositionType) => ({
  x: position.x,
  y: Math.max(position.y - 1, 0),
});
const goRight = (position: PositionType) => ({
  x: position.x,
  y: Math.min(position.y + 1, COLUMNS_NUMBER - 1),
});

export {
  getMatrixPositionFromIndex,
  getIndexFromMaxtrixPosition,
  goUp,
  goDown,
  goLeft,
  goRight,
};