Question

我在flutter应用程序中使用google_maps_flutter来使用google map我有自定义标记图标，并使用BitmapDescriptor.fromBytes（markerIcon）加载了该图标，但是我想从Url显示带有一些文本的图标。这是我的颤动代码：

Map<MarkerId, Marker> markers =
  <MarkerId, Marker>{}; // CLASS MEMBER, MAP OF MARKS

void _add([center]) async {


for (int i = 0; i < sallersList.length; i++) {
  if (sallersList[i]["uID"] != currentUser.uid) {
    /*var request = await http.get(sallersList[i]["user_image"]);
    var bytes = await request.bodyBytes;*/

     final Uint8List markerIcon = await getBytesFromCanvas(150,         150);

    var markerIdVal = sallersList[i]["uID"];
    final MarkerId markerId = MarkerId(markerIdVal);

    // creating a new MARKER
    final Marker marker = Marker(
      markerId: markerId,
      position: LatLng(
          sallersList[i]["latitude"], //+ sin(1 * pi / 6.0) / 20.0,
          sallersList[i]["longitude"] //+ cos(1 * pi / 6.0) / 20.0,
          ),
      // icon: BitmapDescriptor.fromBytes(bytes.buffer.asUint8List(),),
      icon: BitmapDescriptor.fromBytes(markerIcon),
      infoWindow: InfoWindow(
          title: sallersList[i]["user_name"],
          snippet: sallersList[i]["address"]),
      onTap: () {
       // print(sallersList[i]["uID"]);

        Navigator.of(context).push(new MaterialPageRoute(
            builder: (BuildContext context) =>
            new DirectDetails()));
      },
    );
    if (this.mounted)
      setState(() {
        // adding a new marker to map
        markers[markerId] = marker;
      });
  }
}
}


Future<Uint8List> getBytesFromCanvas(int width, int height) async  {
final ui.PictureRecorder pictureRecorder = ui.PictureRecorder();
final Canvas canvas = Canvas(pictureRecorder);
final Paint paint = Paint()..color = Colors.blue;
final Radius radius = Radius.circular(width/2);
canvas.drawRRect(
    RRect.fromRectAndCorners(
      Rect.fromLTWH(0.0, 0.0, width.toDouble(),  height.toDouble()),
      topLeft: radius,
      topRight: radius,
      bottomLeft: radius,
      bottomRight: radius,
    ),
    paint);

TextPainter painter = TextPainter(textDirection: TextDirection.ltr);
painter.text = TextSpan(
  text: '1',
  style: TextStyle(fontSize: 65.0, color: Colors.white),
);

painter.layout();
painter.paint(
    canvas,
    Offset((width * 0.5) - painter.width * 0.5,
        (height * .5) - painter.height * 0.5));
final img = await pictureRecorder.endRecording().toImage(width, height);
final data = await img.toByteData(format: ui.ImageByteFormat.png);
return data.buffer.asUint8List();
}

这是我们想要实现的

这是我能够实现的。

是否可以通过抖动或可以动态创建图像的任何外部图像依赖项来实现相同目的。

Answer 1

要实现以下样式化的休闲步骤，请执行以下操作：

导入软件包

import 'dart:async';
import 'dart:ui' as ui;
import 'dart:typed_data';
import 'dart:io';
import 'package:flutter/material.dart';

（可选）添加一个辅助函数以按路径获取图像

Future<ui.Image> getImageFromPath(String imagePath) async {
    File imageFile = File(imagePath);

    Uint8List imageBytes = imageFile.readAsBytesSync();

    final Completer<ui.Image> completer = new Completer();

    ui.decodeImageFromList(imageBytes, (ui.Image img) {
      return completer.complete(img);
    });

    return completer.future;
}

添加函数getMarkerIcon()返回BitmapDescriptor。这是您的函数getBytesFromCanvas()

Future<BitmapDescriptor> getMarkerIcon(String imagePath, Size size) async {
    final ui.PictureRecorder pictureRecorder = ui.PictureRecorder();
    final Canvas canvas = Canvas(pictureRecorder);

    final Radius radius = Radius.circular(size.width / 2);

    final Paint tagPaint = Paint()..color = Colors.blue;
    final double tagWidth = 40.0;

    final Paint shadowPaint = Paint()..color = Colors.blue.withAlpha(100);
    final double shadowWidth = 15.0;

    final Paint borderPaint = Paint()..color = Colors.white;
    final double borderWidth = 3.0;

    final double imageOffset = shadowWidth + borderWidth;

    // Add shadow circle
    canvas.drawRRect(
        RRect.fromRectAndCorners(
          Rect.fromLTWH(
              0.0,
              0.0,
              size.width,
              size.height
          ),
          topLeft: radius,
          topRight: radius,
          bottomLeft: radius,
          bottomRight: radius,
        ),
        shadowPaint);

    // Add border circle
    canvas.drawRRect(
        RRect.fromRectAndCorners(
          Rect.fromLTWH(
              shadowWidth,
              shadowWidth,
              size.width - (shadowWidth * 2),
              size.height - (shadowWidth * 2)
          ),
          topLeft: radius,
          topRight: radius,
          bottomLeft: radius,
          bottomRight: radius,
        ),
        borderPaint);

    // Add tag circle
    canvas.drawRRect(
        RRect.fromRectAndCorners(
          Rect.fromLTWH(
              size.width - tagWidth,
              0.0,
              tagWidth,
              tagWidth
          ),
          topLeft: radius,
          topRight: radius,
          bottomLeft: radius,
          bottomRight: radius,
        ),
        tagPaint);

    // Add tag text
    TextPainter textPainter = TextPainter(textDirection: TextDirection.ltr);
    textPainter.text = TextSpan(
      text: '1',
      style: TextStyle(fontSize: 20.0, color: Colors.white),
    );

    textPainter.layout();
    textPainter.paint(
        canvas,
        Offset(
            size.width - tagWidth / 2 - textPainter.width / 2,
            tagWidth / 2 - textPainter.height / 2
        )
    );

    // Oval for the image
    Rect oval = Rect.fromLTWH(
        imageOffset,
        imageOffset,
        size.width - (imageOffset * 2),
        size.height - (imageOffset * 2)
    );

    // Add path for oval image
    canvas.clipPath(Path()
      ..addOval(oval));

    // Add image
    ui.Image image = await getImageFromPath(imagePath); // Alternatively use your own method to get the image
    paintImage(canvas: canvas, image: image, rect: oval, fit: BoxFit.fitWidth);

    // Convert canvas to image
    final ui.Image markerAsImage = await pictureRecorder.endRecording().toImage(
        size.width.toInt(),
        size.height.toInt()
    );

    // Convert image to bytes
    final ByteData byteData = await markerAsImage.toByteData(format: ui.ImageByteFormat.png);
    final Uint8List uint8List = byteData.buffer.asUint8List();

    return BitmapDescriptor.fromBytes(uint8List);
}

像这样使用它

final Marker marker = Marker(
      icon: await getMarkerIcon("path/to/your/image.png", Size(150.0, 150.0))
);

注意： 为了演示的目的，将带有数字的标签“宽松地”放置-您可能需要更改其样式，以便随内容扩展。

Answer 2

将图像包https://pub.dev/packages/image用作即时通讯
下载图片文件f =等待_downloadFile（url，“ border”）; im.Image img = im.decodeImage（f.readAsBytesSync（））;
使用drawString（）在上面写数字
BitmapDescriptor.fromBytes（im.encodePng（img））

static var httpClient = new HttpClient（）;

Future<File> _downloadFile(String url, String filename) async {
    var request = await httpClient.getUrl(Uri.parse(url));
    var response = await request.close();
    var bytes = await consolidateHttpClientResponseBytes(response);
    String dir = (await getApplicationDocumentsDirectory()).path;
    File file = new File('$dir/$filename');
    await file.writeAsBytes(bytes);
    return file;
  }

如何在Flutter中自定义Google Maps标记图标

2 个答案: