sector static method

Path sector({ required Offset center, required double r, required double r0, required double startAngle, required double endAngle, required bool clockwise, Path? path, })

A sector path function.

This functions can either return a new path or add to existing path.

Implementation

static Path sector({
  required Offset center,
  required double r,
  required double r0,
  required double startAngle,
  required double endAngle,
  required bool clockwise,
  Path? path,
}) {
  path = path ?? Path();

  final sweepAngle =
      clockwise ? endAngle - startAngle : startAngle - endAngle;

  if (sweepAngle.equalTo(0)) {
    return path;
  }

  // The canvas can not fill a ring, so it is devided to two semi rings
  if (sweepAngle.abs().equalTo(pi * 2)) {
    sector(
      center: center,
      r: r,
      r0: r0,
      startAngle: 0,
      endAngle: pi,
      clockwise: true,
      path: path,
    );
    sector(
      center: center,
      r: r,
      r0: r0,
      startAngle: pi,
      endAngle: pi * 2,
      clockwise: true,
      path: path,
    );
    return path;
  }

  path.moveTo(
      cos(startAngle) * r + center.dx, sin(startAngle) * r + center.dy);
  path.arcTo(
    Rect.fromCircle(center: center, radius: r),
    startAngle,
    sweepAngle,
    false,
  );
  path.lineTo(cos(endAngle) * r0 + center.dx, sin(endAngle) * r0 + center.dy);
  if (r0 != 0) {
    path.arcTo(
      Rect.fromCircle(center: center, radius: r0),
      endAngle,
      -sweepAngle,
      false,
    );
  }
  path.close();

  return path;
}