@antv/f2/es/util/vector.js

/**
 *  expand Vec2
 */
import { vec2 } from 'gl-matrix';
var vec2Direction = function vec2Direction(v1, v2) {
  return v1[0] * v2[1] - v2[0] * v1[1];
};
var vec2Zero = function vec2Zero(v) {
  return v[0] === 0 && v[1] === 0;
};
var vec2AngleTo = function vec2AngleTo(v1, v2, direction) {
  var angle = vec2.angle(v1, v2);
  var angleLargeThanPI = vec2Direction(v1, v2) >= 0;
  if (direction) {
    if (angleLargeThanPI) {
      return Math.PI * 2 - angle;
    }
    return angle;
  }
  if (angleLargeThanPI) {
    return angle;
  }
  return Math.PI * 2 - angle;
};
export { vec2Zero, vec2AngleTo };