drawAxisLabels method

void drawAxisLabels(Canvas canvas, Size size, double minX, double maxX, double minY, double maxY,)

Draw axis labels (optimized with text style caching)

Implementation

void drawAxisLabels(
  Canvas canvas,
  Size size,
  double minX,
  double maxX,
  double minY,
  double maxY,
) {
  if (!showLabel || !showAxis || !theme.showAxis) return;

  // Validate size and ranges
  if (size.width <= 0 || size.height <= 0) return;
  if (!size.width.isFinite || !size.height.isFinite) return;

  final xRange = maxX - minX;
  final yRange = maxY - minY;

  // Validate ranges are valid and non-zero
  if (!xRange.isFinite || !yRange.isFinite) return;

  // Cache text style
  final textStyle = TextStyle(
    color: theme.axisColor.withValues(alpha: 0.8),
    fontSize: 11,
    fontWeight: FontWeight.w500,
    letterSpacing: 0.2,
  );

  // X-axis labels - better formatting with pre-calculated values
  final xLabelsCount =
      math.max(1, math.min(6, (xRange > 0 ? xRange : 1).ceil().toInt()));
  if (xLabelsCount > 0 && xRange > 0) {
    final xStep = size.width / xLabelsCount;

    for (int i = 0; i <= xLabelsCount; i++) {
      final x = xStep * i;
      if (!x.isFinite) continue;

      final value = minX + xRange * (i / xLabelsCount);
      if (!value.isFinite) continue;

      final displayValue = value % 1 == 0
          ? value.toInt().toString()
          : value.toStringAsFixed(1);

      final textPainter = TextPainter(
        text: TextSpan(text: displayValue, style: textStyle),
        textDirection: TextDirection.ltr,
      );
      textPainter.layout();

      final offsetX = x - textPainter.width / 2;
      final offsetY = size.height + 8;

      // Validate offset values before painting
      if (offsetX.isFinite && offsetY.isFinite) {
        textPainter.paint(
          canvas,
          Offset(offsetX, offsetY),
        );
      }
    }
  }

  // Y-axis labels - better formatting with pre-calculated values
  const yLabels = 5;
  if (yLabels > 0 && yRange > 0) {
    final yStep = size.height / yLabels;

    for (int i = 0; i <= yLabels; i++) {
      final y = size.height - yStep * i;
      if (!y.isFinite) continue;

      final value = minY + yRange * (i / yLabels);
      if (!value.isFinite) continue;

      final displayValue = value % 1 == 0
          ? value.toInt().toString()
          : value.toStringAsFixed(1);

      final textPainter = TextPainter(
        text: TextSpan(text: displayValue, style: textStyle),
        textDirection: TextDirection.ltr,
      );
      textPainter.layout();

      final offsetX = -textPainter.width - 8;
      final offsetY = y - textPainter.height / 2;

      // Validate offset values before painting
      if (offsetX.isFinite && offsetY.isFinite) {
        textPainter.paint(
          canvas,
          Offset(offsetX, offsetY),
        );
      }
    }
  }
}