crazytoucan / math2d Goto Github PK

import { polygonIntersectRay, rayLookAt } from "math2d";

const getBoundingPolygon = ({ width, height }) => {
  const topLeft = [0, 0];
  const topRight = [width, 0]
  const bottomLeft = [0, height];
  const bottomRight = [width, height];
  return [
    ...topLeft,
    ...topRight,
    ...bottomRight,
    ...bottomLeft
  ];
};

const unitSquarePolygon = getBoundingPolygon({ width: 1, height: 1 });
const centreVec = { x: 0.5, y: 0.5 };
const rayFromCentrePositiveXDirection = rayLookAt(centreVec, { x: 0.6, y: 0.5 });
const rayFromCenterNegativeXDirection = rayLookAt(centreVec, { x: 0.4, y: 0.5 });

polygonIntersectRay(unitSquarePolygon, rayFromCentrePositiveXDirection);

polygonIntersectRay(unitSquarePolygon, rayFromCenterNegativeXDirection);