generatePath method

Path generatePath(Rect rect, double? scale)

Generates the actual path for the arc shape based on position and direction.

Creates a rectangular path with one curved edge using quadratic Bezier curves. The implementation handles four different arc positions (top, bottom, left, right) and two directions (inside, outside) for a total of eight possible arc configurations.

rect - The bounding rectangle that defines the drawing area. scale - Optional scaling factor (currently unused).

Returns a Path object with the arc shape's geometric outline.

Implementation

Path generatePath(Rect rect, double? scale) {
  final size = rect.size;
  switch (this.position) {
    case ArcPosition.Top:
      if (direction == ArcDirection.Outside) {
        return Path()
          ..moveTo(0.0, height)
          ..quadraticBezierTo(size.width / 4, 0.0, size.width / 2, 0.0)
          ..quadraticBezierTo(size.width * 3 / 4, 0.0, size.width, height)
          ..lineTo(size.width, size.height)
          ..lineTo(0.0, size.height)
          ..close();
      } else {
        return Path()
          ..quadraticBezierTo(size.width / 4, height, size.width / 2, height)
          ..quadraticBezierTo(size.width * 3 / 4, height, size.width, 0.0)
          ..lineTo(size.width, size.height)
          ..lineTo(0.0, size.height)
          ..close();
      }
    case ArcPosition.Bottom:
      if (direction == ArcDirection.Outside) {
        return Path()
          ..lineTo(0.0, size.height - height)
          ..quadraticBezierTo(
            size.width / 4,
            size.height,
            size.width / 2,
            size.height,
          )
          ..quadraticBezierTo(
            size.width * 3 / 4,
            size.height,
            size.width,
            size.height - height,
          )
          ..lineTo(size.width, 0.0)
          ..close();
      } else {
        return Path()
          ..moveTo(0.0, size.height)
          ..quadraticBezierTo(
            size.width / 4,
            size.height - height,
            size.width / 2,
            size.height - height,
          )
          ..quadraticBezierTo(
            size.width * 3 / 4,
            size.height - height,
            size.width,
            size.height,
          )
          ..lineTo(size.width, 0.0)
          ..lineTo(0.0, 0.0)
          ..close();
      }
    case ArcPosition.Left:
      if (direction == ArcDirection.Outside) {
        return Path()
          ..moveTo(height, 0.0)
          ..quadraticBezierTo(0.0, size.height / 4, 0.0, size.height / 2)
          ..quadraticBezierTo(0.0, size.height * 3 / 4, height, size.height)
          ..lineTo(size.width, size.height)
          ..lineTo(size.width, 0.0)
          ..close();
      } else {
        return Path()
          ..quadraticBezierTo(
            height,
            size.height / 4,
            height,
            size.height / 2,
          )
          ..quadraticBezierTo(height, size.height * 3 / 4, 0.0, size.height)
          ..lineTo(size.width, size.height)
          ..lineTo(size.width, 0.0)
          ..close();
      }
    default: //right
      if (direction == ArcDirection.Outside) {
        return Path()
          ..moveTo(size.width - height, 0.0)
          ..quadraticBezierTo(
            size.width,
            size.height / 4,
            size.width,
            size.height / 2,
          )
          ..quadraticBezierTo(
            size.width,
            size.height * 3 / 4,
            size.width - height,
            size.height,
          )
          ..lineTo(0.0, size.height)
          ..lineTo(0.0, 0.0)
          ..close();
      } else {
        return Path()
          ..moveTo(size.width, 0.0)
          ..quadraticBezierTo(
            size.width - height,
            size.height / 4,
            size.width - height,
            size.height / 2,
          )
          ..quadraticBezierTo(
            size.width - height,
            size.height * 3 / 4,
            size.width,
            size.height,
          )
          ..lineTo(0.0, size.height)
          ..lineTo(0.0, 0.0)
          ..close();
      }
  }
}