pixi.js/lib/scene/graphics/shared/utils/getOrientationOfPoints.js

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'use strict';

"use strict";
function getOrientationOfPoints(points) {
  const m = points.length;
  if (m < 6) {
    return 1;
  }
  let area = 0;
  for (let i = 0, x1 = points[m - 2], y1 = points[m - 1]; i < m; i += 2) {
    const x2 = points[i];
    const y2 = points[i + 1];
    area += (x2 - x1) * (y2 + y1);
    x1 = x2;
    y1 = y2;
  }
  if (area < 0) {
    return -1;
  }
  return 1;
}

exports.getOrientationOfPoints = getOrientationOfPoints;
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