Function keyDirection

src/engineInput.js:142–150

Returns input vector from arrow keys or WASD if enabled * @param {string} [up] * @param {string} [down] * @param {string} [left] * @param {string} [right] * @return {Vector2} * @memberof Input

(up='ArrowUp', down='ArrowDown', left='ArrowLeft', right='ArrowRight')

 *  @return {Vector2}
 *  @memberof Input */
function keyDirection(up='ArrowUp', down='ArrowDown', left='ArrowLeft', right='ArrowRight')
{
    ASSERT(isStringLike(up),    'up key must be a string');
    ASSERT(isStringLike(down),  'down key must be a string');
    ASSERT(isStringLike(left),  'left key must be a string');
    ASSERT(isStringLike(right), 'right key must be a string');
    const k = (key)=> keyIsDown(key) ? 1 : 0;
    return vec2(k(right) - k(left), k(up) - k(down));
}

/** Returns true if mouse button is down
 *  @function