145 lines
3.6 KiB
Dart
145 lines
3.6 KiB
Dart
import 'dart:math';
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import 'package:aves/widgets/common/basic/outlined_text.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_map/flutter_map.dart';
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import 'package:flutter_map/plugin_api.dart';
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import 'scalebar_utils.dart' as util;
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class ScaleLayerOptions extends LayerOptions {
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final Widget Function(double width, String distance) builder;
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ScaleLayerOptions({
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Key key,
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this.builder = defaultBuilder,
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rebuild,
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}) : super(key: key, rebuild: rebuild);
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static Widget defaultBuilder(double width, String distance) {
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return ScaleBar(
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distance: distance,
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width: width,
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);
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}
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}
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class ScaleLayerWidget extends StatelessWidget {
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final ScaleLayerOptions options;
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ScaleLayerWidget({@required this.options}) : super(key: options.key);
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@override
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Widget build(BuildContext context) {
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final mapState = MapState.of(context);
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return ScaleLayer(options, mapState, mapState.onMoved);
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}
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}
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class ScaleLayer extends StatelessWidget {
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final ScaleLayerOptions scaleLayerOpts;
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final MapState map;
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final Stream<Null> stream;
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final scale = [
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25000000,
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15000000,
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8000000,
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4000000,
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2000000,
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1000000,
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500000,
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250000,
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100000,
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50000,
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25000,
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15000,
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8000,
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4000,
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2000,
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1000,
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500,
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250,
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100,
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50,
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25,
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10,
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5,
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];
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ScaleLayer(this.scaleLayerOpts, this.map, this.stream) : super(key: scaleLayerOpts.key);
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@override
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Widget build(BuildContext context) {
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return StreamBuilder<Null>(
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stream: stream,
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builder: (context, snapshot) {
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final center = map.center;
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final latitude = center.latitude.abs();
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final level = map.zoom.round() +
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(latitude > 80
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? 4
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: latitude > 60
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? 3
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: 2);
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final distance = scale[max(0, min(20, level))].toDouble();
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final start = map.project(center);
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final targetPoint = util.calculateEndingGlobalCoordinates(center, 90, distance);
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final end = map.project(targetPoint);
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final displayDistance = distance > 999 ? '${(distance / 1000).toStringAsFixed(0)} km' : '${distance.toStringAsFixed(0)} m';
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final double width = (end.x - start.x);
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return scaleLayerOpts.builder(width, displayDistance);
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},
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);
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}
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}
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class ScaleBar extends StatelessWidget {
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final String distance;
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final double width;
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static const Color fillColor = Colors.black;
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static const Color outlineColor = Colors.white;
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static const double outlineWidth = .5;
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static const double barThickness = 1;
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const ScaleBar({
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@required this.distance,
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@required this.width,
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});
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@override
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Widget build(BuildContext context) {
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return Container(
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alignment: AlignmentDirectional.bottomStart,
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padding: EdgeInsets.symmetric(vertical: 8, horizontal: 16),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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OutlinedText(
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text: distance,
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style: TextStyle(
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color: fillColor,
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fontSize: 11,
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),
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outlineWidth: outlineWidth * 2,
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outlineColor: outlineColor,
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),
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Container(
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height: barThickness + outlineWidth * 2,
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width: width,
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decoration: BoxDecoration(
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color: fillColor,
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border: Border.all(
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color: outlineColor,
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width: outlineWidth,
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),
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borderRadius: BorderRadius.circular(8),
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),
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),
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],
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),
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);
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}
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}
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