drawPhaseTextInside method

void drawPhaseTextInside(Canvas canvas, Offset center, double radius, int startDay, int endDay, Color textColor, String label,)

Draw Phase text inside circle like Menstruation, Ovulation etc

Implementation

void drawPhaseTextInside(Canvas canvas, Offset center, double radius,
    int startDay, int endDay, Color textColor, String label) {
  final startAngle = (2 * pi / totalCycleDays) * startDay - pi / 2;
  final sweepAngle = (2 * pi / totalCycleDays) * (endDay - startDay);

  final textPainter = TextPainter(
    textAlign: TextAlign.center,
    textDirection: TextDirection.ltr,
  );

  final labelAngle = startAngle + sweepAngle / 2;
  final labelRadius = radius / 2;
  final labelX = center.dx + labelRadius * cos(labelAngle);
  final labelY = center.dy + labelRadius * sin(labelAngle);

  /// Calculate rotation angle
  double rotationAngle;
  if (labelAngle > pi / 2 && labelAngle < 3 * pi / 2) {
    rotationAngle = labelAngle - pi;
  } else {
    rotationAngle = labelAngle;
  }

  canvas.save();
  canvas.translate(labelX, labelY);
  canvas.rotate(rotationAngle);
  canvas.translate(-labelX, -labelY);

  final labelText = TextSpan(
    text: label,
    style: TextStyle(
      color: textColor,
      fontSize: insidePhasesTextSize,
      fontWeight: FontWeight.bold,
    ),
  );

  textPainter.text = labelText;
  textPainter.layout();
  textPainter.paint(
    canvas,
    Offset(
      labelX - textPainter.width / 2,
      labelY - textPainter.height / 2,
    ),
  );

  canvas.restore();
}