@phaserjs/phaser/geom/triangle/GetTriangleArea.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 GetTriangleArea(triangle) {
  const { x1, y1, x2, y2, x3, y3 } = triangle;
  return Math.abs(((x3 - x1) * (y2 - y1) - (x2 - x1) * (y3 - y1)) / 2);
}