CustomAnnotation threated as TagAnnotation

[Teocrito]

I´m trying to make a bar char with 2 series, i have all setup and working but i wanted to add one annotation to show the color of each serie at the bottomCenter of the chart, so i use a CustomAnnotation but when i save my changes i got the following error:

E/flutter ( 8790): [ERROR:flutter/shell/common/shell.cc(94)] Dart Unhandled Exception: type 'Null' is not a subtype of type 'Label' in type cast, stack trace: #0 TagAnnotOp.evaluate (package:graphic/src/guide/annotation/tag.dart:40:35)
E/flutter ( 8790): #1 Operator.run (package:graphic/src/dataflow/operator.dart:87:29)
E/flutter ( 8790): #2 Dataflow.evaluate (package:graphic/src/dataflow/dataflow.dart:95:27)
E/flutter ( 8790): #3 View.evaluate (package:graphic/src/chart/view.dart:69:17)
E/flutter ( 8790): #4 Dataflow.run (package:graphic/src/dataflow/dataflow.dart:123:16)
E/flutter ( 8790): #5 new View (package:graphic/src/chart/view.dart:25:5)
E/flutter ( 8790): #6 _ChartLayoutDelegate.getPositionForChild (package:graphic/src/chart/chart.dart:680:20)
E/flutter ( 8790): #7 RenderCustomSingleChildLayoutBox.performLayout (package:flutter/src/rendering/shifted_box.dart:1361:41)
E/flutter ( 8790): #8 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
E/flutter ( 8790): #9 RenderConstrainedBox.performLayout (package:flutter/src/rendering/proxy_box.dart:277:14)
E/flutter ( 8790): #10 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
E/flutter ( 8790): #11 _RenderLayoutBuilder.performLayout (package:flutter/src/widgets/layout_builder.dart:319:14)
E/flutter ( 8790): #12 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
E/flutter ( 8790): #13 ChildLayoutHelper.layoutChild (package:flutter/src/rendering/layout_helper.dart:56:11)
E/flutter ( 8790): #14 RenderFlex._computeSizes (package:flutter/src/rendering/flex.dart:896:45)
E/flutter ( 8790): #15 RenderFlex.performLayout (package:flutter/src/rendering/flex.dart:931:32)
E/flutter ( 8790): #16 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
E/flutter ( 8790): #17 RenderPadding.performLayout (package:flutter/src/rendering/shifted_box.dart:233:12)
E/flutter ( 8790): #18 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
E/flutter ( 8790): #19 MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:171:12)
E/flutter ( 8790): #20 _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:1005:7)
E/flutter ( 8790): #21 MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:240:7)
E/flutter ( 8790): #22 RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:403:14)
E/flutter ( 8790): #23 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
E/flutter ( 8790): #24 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter ( 8790): #25 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
E/flutter ( 8790): #26 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter ( 8790): #27 _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1376:11)
E/flutter ( 8790): #28 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
E/flutter ( 8790): #29 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter ( 8790): #30 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
E/flutter ( 8790): #31 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter ( 8790): #32 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
E/flutter ( 8790): #33 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter ( 8790): #34 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
Reloaded 2 of 1223 libraries in 1,410ms.
E/flutter ( 8790): #35 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter ( 8790): #36 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
E/flutter ( 8790): #37 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter ( 8790): #38 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
E/flutter ( 8790): #39 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter ( 8790): #40 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
E/flutter ( 8790): #41 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter ( 8790): #42 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
E/flutter ( 8790): #43 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter ( 8790): #44 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)

This is my CustomAnnotation declaration:

CustomAnnotation(
    renderer: (position) => chart_utils.buildSeriesAnnotation(position, labels),
    anchor: (size) => Offset(((size.width - 60) / 2) + 60, size.height)
)

And my renderer:

List<Figure> buildSeriesAnnotation(Offset position, Map<String, Color> series) {
  List<Figure> resut = [];
  final colors = series.values.toList(growable: false);
  final labels = series.entries.map((e) => _buildText(e.key, e.value, true)).toList(growable: false);
  for (var l in labels) {
    l.layout();
  }
  final width = (quiver.max( labels.map((e) => e.width) ) ?? 0) + (15 * labels.length);
  final height = math.max( 20, quiver.max( labels.map((e) => e.height) ) ?? 0 );
  var leftTop = Offset(position.dx - (width / 2), position.dy - height);
  
  for (int i = 0; i < labels.length; i++) {
    var labelPainter = labels[i];
    var colorRect = Rect.fromLTWH(leftTop.dx, leftTop.dy, 20, 20);
    var labelPaintPoint = leftTop + Offset(25, labelPainter.height / 2);
    var colorPath = Path()..addRRect( RRect.fromRectAndRadius(colorRect, Radius.zero) );
    resut.addAll([
      PathFigure(colorPath, Paint()..color = colors[i]),
      TextFigure(labelPainter, labelPaintPoint)
    ]);
    leftTop += Offset(labelPainter.width + 35, 0);
  }
  return resut;
}

[Teocrito]

I think i found the error in src/parse/parse.dart: line 604, you're assigning TagAnnotationOp instead of CustomAnnotOp

} else {
  annotSpec as CustomAnnotation;
  annot = view.add(TagAnnotOp({
    'anchor': anchor,
    'renderer': annotSpec.renderer,
  }));
}

[entronad]

The issue is fixed in the latest v0.6.2. Please have a try.