@phaserjs/phaser
Version:
12 lines (11 loc) • 565 B
JavaScript
/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2020 Photon Storm Ltd.
* @license {@link https://opensource.org/licenses/MIT|MIT License}
*/
export function RotateTriangleAround(triangle, x, y, angle) {
const { x1, y1, x2, y2, x3, y3 } = triangle;
const c = Math.cos(angle);
const s = Math.sin(angle);
return triangle.set((x1 - x) * c - (y1 - y) * s + x, (x1 - x) * s + (y1 - y) * c + y, (x2 - x) * c - (y2 - y) * s + x, (x2 - x) * s + (y2 - y) * c + y, (x3 - x) * c - (y3 - y) * s + x, (x3 - x) * s + (y3 - y) * c + y);
}