@phaserjs/phaser/geom/line/GetLinePerpSlope.js

Phaser 4

/**
 * @author       Richard Davey <rich@photonstorm.com>
 * @copyright    2020 Photon Storm Ltd.
 * @license      {@link https://opensource.org/licenses/MIT|MIT License}
 */
export function GetLinePerpSlope(line) {
  const { x1, y1, x2, y2 } = line;
  return -((x2 - x1) / (y2 - y1));
}