drawOval method

Point drawOval(Rect rect)

Draw an oval inscribed in a rectangle.

Equivalent to PyMuPDF's shape.draw_oval().

Implementation

Point drawOval(Rect rect) {
  // Approximate ellipse with 4 cubic Bezier curves
  final cx = (rect.x0 + rect.x1) / 2;
  final cy = (rect.y0 + rect.y1) / 2;
  final rx = rect.width / 2;
  final ry = rect.height / 2;
  // kappa for circle approximation
  const k = 0.5522847498;
  final kx = rx * k;
  final ky = ry * k;

  // Start at right-middle
  _path.write('${_f(cx + rx)} ${_f(cy)} m ');
  // Top-right quarter
  _path.write(
    '${_f(cx + rx)} ${_f(cy - ky)} '
    '${_f(cx + kx)} ${_f(cy - ry)} '
    '${_f(cx)} ${_f(cy - ry)} c ',
  );
  // Top-left quarter
  _path.write(
    '${_f(cx - kx)} ${_f(cy - ry)} '
    '${_f(cx - rx)} ${_f(cy - ky)} '
    '${_f(cx - rx)} ${_f(cy)} c ',
  );
  // Bottom-left quarter
  _path.write(
    '${_f(cx - rx)} ${_f(cy + ky)} '
    '${_f(cx - kx)} ${_f(cy + ry)} '
    '${_f(cx)} ${_f(cy + ry)} c ',
  );
  // Bottom-right quarter (close)
  _path.write(
    '${_f(cx + kx)} ${_f(cy + ry)} '
    '${_f(cx + rx)} ${_f(cy + ky)} '
    '${_f(cx + rx)} ${_f(cy)} c ',
  );

  _pathOps++;
  _lastPoint = Point(cx + rx, cy);
  return _lastPoint!;
}