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January 17, 2021 13:53
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| import 'dart:typed_data'; | |
| import 'dart:ui'; | |
| import 'package:flutter/foundation.dart'; | |
| import 'package:flutter/material.dart'; | |
| import 'package:flutter/services.dart'; | |
| import 'package:google_maps_flutter/google_maps_flutter.dart'; | |
| Future<BitmapDescriptor> createCustomMarkerBitmap(int markerNumber, String imageURL) async { | |
| int markerWidth; | |
| if (kIsWeb) markerWidth= 30; else markerWidth = 100; | |
| PictureRecorder recorder = new PictureRecorder(); | |
| Canvas c = Canvas(recorder); | |
| final data1 = await rootBundle.load(imageURL); | |
| var markerImage = await decodeImageFromList(data1.buffer.asUint8List()); | |
| c.drawImageRect(markerImage, Rect.fromLTRB( | |
| 0.0, 0.0, markerImage.width.toDouble(), markerImage.height.toDouble()), | |
| Rect.fromLTRB(0.0, 0.0, markerWidth.toDouble(), markerWidth.toDouble()), Paint()); | |
| TextSpan span = TextSpan( | |
| style: TextStyle(color: Colors.black,fontSize: markerWidth/3,fontWeight: FontWeight.bold), | |
| text: markerNumber.toString(), | |
| ); | |
| TextPainter tp = TextPainter(text: span,textAlign: TextAlign.left,textDirection: TextDirection.ltr); | |
| tp.layout(); | |
| tp.paint(c, Offset(markerNumber > 9 ? markerWidth/3.5 : markerWidth/2.5, markerWidth/5.5)); | |
| var p = recorder.endRecording(); | |
| ByteData pngBytes = | |
| await (await p.toImage(markerWidth, markerWidth)).toByteData(format: ImageByteFormat.png); | |
| Uint8List data = Uint8List.view(pngBytes.buffer); | |
| return BitmapDescriptor.fromBytes(data); | |
| } |
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