drawDataLabelWithBackground method

void drawDataLabelWithBackground(int index, Canvas canvas, String dataLabel, Offset offset, int angle, TextStyle style, Paint fillPaint, Paint strokePaint,)

Implementation

void drawDataLabelWithBackground(
  int index,
  Canvas canvas,
  String dataLabel,
  Offset offset,
  int angle,
  TextStyle style,
  Paint fillPaint,
  Paint strokePaint,
) {
  final EdgeInsets margin = dataLabelSettings.margin;
  if (!dataLabelSettings.showZeroValue && dataLabel == '0') {
    return;
  }
  if (!offset.dx.isNaN && !offset.dy.isNaN) {
    if (dataLabel.isNotEmpty) {
      // TODO(VijayakumarM): Check and optimize.
      if (fillPaint.color != Colors.transparent ||
          (strokePaint.color != const Color.fromARGB(0, 25, 5, 5) &&
              strokePaint.strokeWidth > 0)) {
        final TextPainter textPainter = TextPainter(
          text: TextSpan(text: dataLabel, style: style),
          textDirection: TextDirection.ltr,
        )..layout();
        final Rect dataLabelRect = Rect.fromLTWH(
          offset.dx,
          offset.dy,
          textPainter.width + margin.horizontal,
          textPainter.height + margin.vertical,
        );
        RRect labelRect = RRect.fromRectAndRadius(
            dataLabelRect, Radius.circular(dataLabelSettings.borderRadius));
        // To check and update the label rect and offset by rotated
        // label rect height overlaps with plotArea or not.
        if (angle != 0) {
          final Rect rotatedBounds =
              calculateRotatedBounds(dataLabelRect, dataLabelSettings.angle);
          final double heightFromCenter = rotatedBounds.height / 2;
          if (paintBounds.bottom < labelRect.center.dy + heightFromCenter) {
            labelRect =
                _rotatedRRect(labelRect, labelRect.bottom - heightFromCenter);
            offset = Offset(labelRect.left, labelRect.top);
          }
          if (paintBounds.top > labelRect.center.dy - heightFromCenter) {
            labelRect =
                _rotatedRRect(labelRect, labelRect.top + heightFromCenter);
            offset = Offset(labelRect.left, labelRect.top);
          }
        }

        canvas.save();
        canvas.translate(labelRect.center.dx, labelRect.center.dy);
        canvas.rotate((angle * pi) / 180);
        canvas.translate(-labelRect.center.dx, -labelRect.center.dy);
        if (strokePaint.color != Colors.transparent &&
            strokePaint.strokeWidth > 0) {
          canvas.drawRRect(labelRect, strokePaint);
        }

        if (fillPaint.color != Colors.transparent) {
          canvas.drawRRect(labelRect, fillPaint);
        }
        canvas.restore();
      }
    }
  }
  drawDataLabel(
    index,
    canvas,
    dataLabel,
    offset.dx + margin.left,
    offset.dy + margin.top,
    angle,
    style,
  );
}