Function getDirection

docs/app/js/sanddance-app.js:93013–93017

* get the direction between two points * @param {Number} x * @param {Number} y * @return {Number} direction

(x, y)

 * @param {Number} y
 * @return {Number} direction
 */ function getDirection(x, y) {
        if (x === y) return DIRECTION_NONE;
        if (abs(x) >= abs(y)) return x < 0 ? DIRECTION_LEFT : DIRECTION_RIGHT;
        return y < 0 ? DIRECTION_UP : DIRECTION_DOWN;
    }
    /**
 * calculate the absolute distance between two points
 * @param {Object} p1 {x, y}