arc static method

OpSet arc(PointD center, double width, double height, double start, double stop, bool closed, bool roughClosure, DrawConfig config,)

Implementation

static OpSet arc(PointD center, double width, double height, double start,
    double stop, bool closed, bool roughClosure, DrawConfig config) {
  final List<Op> ops = [];
  final double cx = center.x;
  final double cy = center.y;
  double rx = (width / 2).abs();
  double ry = (height / 2).abs();
  rx += config.offsetSymmetric(rx * 0.01);
  ry += config.offsetSymmetric(ry * 0.01);
  double strt = start;
  double stp = stop;
  while (strt < 0) {
    strt += pi * 2;
    stp += pi * 2;
  }
  if ((stp - strt) > (pi * 2)) {
    strt = 0;
    stp = pi * 2;
  }
  final double ellipseInc = pi * 2 / config.curveStepCount!;
  final double arcIn = min(ellipseInc / 2, (stp - strt) / 2);
  ops
    ..addAll(OpsGenerator.arc(arcIn, cx, cy, rx, ry, strt, stp, 1, config))
    ..addAll(OpsGenerator.arc(arcIn, cx, cy, rx, ry, strt, stp, 1.5, config));
  if (closed) {
    if (roughClosure) {
      ops
        ..addAll(OpsGenerator.doubleLine(
            cx, cy, cx + rx * cos(strt), cy + ry * sin(strt), config))
        ..addAll(OpsGenerator.doubleLine(
            cx, cy, cx + rx * cos(stp), cy + ry * sin(stp), config));
    } else {
      ops
        ..add(Op.lineTo(PointD(cx, cy)))
        ..add(Op.lineTo(PointD(cx + rx * cos(strt), cy + ry * sin(strt))));
    }
  }
  return OpSet(type: OpSetType.path, ops: ops);
}