Function capBezierPoints

src/helpers/helpers.curve.ts:161–181

(points: SplinePoint[], area: ChartArea)

}

function capBezierPoints(points: SplinePoint[], area: ChartArea) {
  let i, ilen, point, inArea, inAreaPrev;
  let inAreaNext = _isPointInArea(points[0], area);
  for (i = 0, ilen = points.length; i < ilen; ++i) {
    inAreaPrev = inArea;
    inArea = inAreaNext;
    inAreaNext = i < ilen - 1 && _isPointInArea(points[i + 1], area);
    if (!inArea) {
      continue;
    }
    point = points[i];
    if (inAreaPrev) {
      point.cp1x = capControlPoint(point.cp1x, area.left, area.right);
      point.cp1y = capControlPoint(point.cp1y, area.top, area.bottom);
    }
    if (inAreaNext) {
      point.cp2x = capControlPoint(point.cp2x, area.left, area.right);
      point.cp2y = capControlPoint(point.cp2y, area.top, area.bottom);
    }
  }
}

/**
 * @private