在google_maps_flutter Flutter插件中使用SVG标记
是否可以使用SVG路径通过google_maps_flutter插件创建标记?我知道您可以.png
通过以下方式使用文件:
icon: BitmapDescriptor.fromAsset("images/myFile.png")
SVG路径如何?
谢谢
回答:
这可以使用flutter_svg包来实现。
import 'dart:ui' as ui; // imported as ui to prevent conflict between ui.Image and the Image widgetimport 'package:flutter/services.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
Future<BitmapDescriptor> _bitmapDescriptorFromSvgAsset(BuildContext context, String assetName) async {
// Read SVG file as String
String svgString = await DefaultAssetBundle.of(context).loadString(assetName);
// Create DrawableRoot from SVG String
DrawableRoot svgDrawableRoot = await svg.fromSvgString(svgString, null);
// toPicture() and toImage() don't seem to be pixel ratio aware, so we calculate the actual sizes here
MediaQueryData queryData = MediaQuery.of(context);
double devicePixelRatio = queryData.devicePixelRatio;
double width = 32 * devicePixelRatio; // where 32 is your SVG's original width
double height = 32 * devicePixelRatio; // same thing
// Convert to ui.Picture
ui.Picture picture = svgDrawableRoot.toPicture(size: Size(width, height));
// Convert to ui.Image. toImage() takes width and height as parameters
// you need to find the best size to suit your needs and take into account the
// screen DPI
ui.Image image = await picture.toImage(width, height);
ByteData bytes = await image.toByteData(format: ui.ImageByteFormat.png);
return BitmapDescriptor.fromBytes(bytes.buffer.asUint8List());
}
然后,您可以照常使用BitmapDescriptor创建标记:
BitmapDescriptor bitmapDescriptor = await _bitmapDescriptorFromSvgAsset(context, 'assets/images/someimage.svg');Marker marker = Marker(markerId: MarkerId('someId'), icon: bitmapDescriptor, position: LatLng(someLatitude, someLongitude));
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