createErrorBitmap method

Future<TilePicture> createErrorBitmap(
  1. dynamic error
)

Creates a tile bitmap to display an error message.

Implementation

Future<TilePicture> createErrorBitmap(dynamic error) async {
  double tileSize = MapsforgeSettingsMgr().tileSize;
  var pictureRecorder = ui.PictureRecorder();
  var canvas = ui.Canvas(pictureRecorder);
  var paint = ui.Paint();
  paint.strokeWidth = 1;
  paint.color = const ui.Color(0xffaaaaaa);
  paint.isAntiAlias = true;

  canvas.drawLine(ui.Offset(_margin, _margin), ui.Offset(tileSize - _margin, _margin), paint);
  canvas.drawLine(ui.Offset(_margin, _margin), ui.Offset(_margin, tileSize - _margin), paint);
  canvas.drawLine(ui.Offset(tileSize - _margin, _margin), ui.Offset(tileSize - _margin, tileSize - _margin), paint);
  canvas.drawLine(ui.Offset(_margin, tileSize - _margin), ui.Offset(tileSize - _margin, tileSize - _margin), paint);

  ui.ParagraphBuilder builder = ui.ParagraphBuilder(ui.ParagraphStyle(fontSize: 10.0, textAlign: TextAlign.center))
    ..pushStyle(ui.TextStyle(color: Colors.black87))
    ..addText(error?.toString() ?? "Error");
  canvas.drawParagraph(builder.build()..layout(ui.ParagraphConstraints(width: tileSize - _margin * 2)), Offset(_margin, _margin));

  var pic = pictureRecorder.endRecording();
  return TilePicture.fromPicture(pic);
}