stringToPoints method

List<Vector3> stringToPoints({ required String command, required bool isRelative, required String coordString, required Vector3 startPoint, })

Implementation

List<Vector3> stringToPoints({
  required String command,
  required bool isRelative,
  required String coordString,
  required Vector3 startPoint,
}) {
  var numbers = stringToNumbers(coordString);
  var result = <Vector3>[];

  if (command == 'A') {
    Vector3? lastEndPoint;

    for (var ellipticNumbers in grouped(numbers, 2)) {
      if (lastEndPoint != null) {
        startPoint = lastEndPoint;
      }

      if (isRelative) {
        ellipticNumbers[5] += startPoint.x;
        ellipticNumbers[6] += startPoint.y;
      }

      if (startPoint.x == ellipticNumbers[5] &&
          startPoint.y == ellipticNumbers[6]) {
        continue;
      }

      result.addAll(
        ellipticalArcToCubicBezier(
          startPoint,
          ellipticNumbers[0],
          ellipticNumbers[1],
          ellipticNumbers[2],
          ellipticNumbers[3],
          ellipticNumbers[4],
          Vector3(ellipticNumbers[5], ellipticNumbers[6], 0),
        ),
      );

      lastEndPoint = Vector3(ellipticNumbers[5], ellipticNumbers[6], 0);
    }

    return result;
  } else if (command == 'H') {
    if (isRelative) {
      result = [for (var x in numbers) Vector3(x, 0, 0)];
    } else {
      result = [for (var x in numbers) Vector3(x, startPoint.y, 0)];
    }
  } else if (command == 'V') {
    if (isRelative) {
      result = [for (var y in numbers) Vector3(0, y, 0)];
    } else {
      result = [for (var y in numbers) Vector3(startPoint.x, y, 0)];
    }
  } else {
    result = [for (var xy in grouped(numbers, 2)) Vector3(xy[0], xy[1], 0)];
  }

  if (!isRelative) {
    return result;
  }

  var entries = 1;

  if (command == 'Q' || command == 'S') {
    entries = 2;
  } else if (command == 'C') {
    entries = 3;
  }

  var offset = startPoint;

  for (var i in range(end: result.length)) {
    result[i] += offset;

    if ((i + 1) % entries == 0) {
      offset = result[i];
    }
  }

  return result;
}