addSmoothCurve method

Path addSmoothCurve(List<Offset> points)

Adds a smooth quadratic Bézier curve through the given list of points.

This method constructs a visually smooth curve by drawing a series of quadratic Bézier segments between midpoints of each adjacent pair of points.

The original path is updated, and the same Path is returned to allow chaining.

Example:

final path = Path().addSmoothCurve([
  Offset(0, 100),
  Offset(50, 0),
  Offset(100, 100),
]);

Requirements:

• Must provide at least 2 points; otherwise, the path remains unchanged.

Implementation

Path addSmoothCurve(List<Offset> points) {
  if (points.length < 2) return this;

  // Move to the first point
  moveTo(points[0].dx, points[0].dy);

  // Iterate through the points and draw quadratic Bézier curves
  for (int i = 0; i < points.length - 1; i++) {
    final p1 = points[i];
    final p2 = points[i + 1];

    // Calculate midpoint between p1 and p2
    final mid = Offset((p1.dx + p2.dx) / 2, (p1.dy + p2.dy) / 2);

    // Add a quadratic curve from p1 to midpoint using p1 as the control point
    quadraticBezierTo(p1.dx, p1.dy, mid.dx, mid.dy);
  }

  // Draw a line to the last point to complete the path
  final last = points.last;
  lineTo(last.dx, last.dy);

  return this;
}