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Use flutter maps with openstreetmap instead of google #23
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| import 'dart:math'; | ||
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| import 'package:flutter/material.dart'; | ||
| import 'package:flutter_map/flutter_map.dart'; | ||
| import 'package:flutter_map/plugin_api.dart'; | ||
| import 'package:munich_ways/common/logger_setup.dart'; | ||
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| class ClickablePolylineLayerWidget extends StatelessWidget { | ||
| final ClickablePolylineLayerOptions options; | ||
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| ClickablePolylineLayerWidget({@required this.options}) | ||
| : super(key: options.key); | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| final mapState = MapState.of(context); | ||
| return ClickablePolylineLayer(options, mapState, mapState.onMoved); | ||
| } | ||
| } | ||
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| class ClickablePolylineLayerOptions extends PolylineLayerOptions { | ||
| ClickablePolylineLayerOptions({ | ||
| Key key, | ||
| polylines = const [], | ||
| polylineCulling = false, | ||
| rebuild, | ||
| }) : super( | ||
| key: key, | ||
| polylines: polylines, | ||
| polylineCulling: polylineCulling, | ||
| rebuild: rebuild); | ||
| } | ||
|
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| class ClickablePolyline extends Polyline { | ||
| VoidCallback onTap; | ||
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| ClickablePolyline( | ||
| {points, | ||
| strokeWidth = 1.0, | ||
| color = const Color(0xFF00FF00), | ||
| borderStrokeWidth = 0.0, | ||
| borderColor = const Color(0xFFFFFF00), | ||
| gradientColors, | ||
| colorsStop, | ||
| isDotted = false, | ||
| this.onTap}) | ||
| : super( | ||
| points: points, | ||
| strokeWidth: strokeWidth, | ||
| color: color, | ||
| borderStrokeWidth: borderStrokeWidth, | ||
| borderColor: borderColor, | ||
| gradientColors: gradientColors, | ||
| colorsStop: colorsStop, | ||
| isDotted: isDotted, | ||
| ); | ||
| } | ||
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| class ClickablePolylineLayer extends StatelessWidget { | ||
| final PolylineLayerOptions polylineOpts; | ||
| final MapState map; | ||
| final Stream<Null> stream; | ||
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| ClickablePolylineLayer(this.polylineOpts, this.map, this.stream) | ||
| : super(key: polylineOpts.key); | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| return GestureDetector( | ||
| onTapUp: (TapUpDetails details) { | ||
| //Detect nearest polyline to the tapped point | ||
| polylineOpts.polylines.forEach((polyline) { | ||
| for (var i = 0; i < polyline.offsets.length - 1; i++) { | ||
| Offset x = polyline.offsets[i]; | ||
| Offset y = polyline.offsets[i + 1]; | ||
| Offset tap = details.localPosition; | ||
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| double a = _dist(x, y); | ||
| double b = _dist(x, tap); | ||
| double c = _dist(y, tap); | ||
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| // Use Herons formula to calculate area of triangle and from there the height | ||
| // https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes/xfd53e0255cd302f8:herons-formula/v/heron-s-formula | ||
| double s = (a + b + c) / 2.0; | ||
| double area = sqrt(s * (s - a) * (s - b) * (s - c)); | ||
| double height = (2 * area) / a; | ||
|
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| /* | ||
| Ensure tap is between x and y or inside the threshold of one of the points | ||
| Use Pythagoras: d = sqrt((c*c - h*h)) or d = sqrt((b*b - h*h)) | ||
| In following case b is used (because its the hypotenuse) for our triangle: | ||
| x-------a--------y...d......z | ||
| --- - . | ||
| --- - . | ||
| b --- c - .height | ||
| --- - . | ||
| --- - . | ||
| ------------tap | ||
| */ | ||
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| double aAndD = sqrt((_sqr(max(b, c))) - _sqr(height)); | ||
| double distanceToA = aAndD - a; | ||
| double threshold = 20; | ||
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| if (height < threshold && distanceToA < threshold) { | ||
| log.d("Click found on $polyline"); | ||
| if (polyline is ClickablePolyline) { | ||
| ClickablePolyline clickable = polyline; | ||
| if (clickable.onTap != null) { | ||
| clickable.onTap(); | ||
| } | ||
| } | ||
| return; | ||
| } | ||
| } | ||
| }); | ||
| }, | ||
| child: PolylineLayer(polylineOpts, map, stream).build(context)); | ||
| } | ||
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| double _dist(Offset v, Offset w) { | ||
| return sqrt(_dist2(v, w)); | ||
| } | ||
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| double _dist2(Offset v, Offset w) { | ||
| return _sqr(v.dx - w.dx) + _sqr(v.dy - w.dy); | ||
| } | ||
|
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| double _sqr(double x) { | ||
| return x * x; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:munich_ways/common/logger_setup.dart'; | ||
| import 'package:url_launcher/url_launcher.dart'; | ||
|
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| class OSMCreditsWidget extends StatelessWidget { | ||
| const OSMCreditsWidget({ | ||
| Key key, | ||
| }) : super(key: key); | ||
|
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| @override | ||
| Widget build(BuildContext context) { | ||
| return Align( | ||
| alignment: Alignment.bottomLeft, | ||
| child: GestureDetector( | ||
| onTap: () async { | ||
| const url = 'https://www.openstreetmap.org/copyright'; | ||
| if (await canLaunch(url)) { | ||
| await launch(url); | ||
| } else { | ||
| log.e("No browser found"); | ||
| } | ||
| }, | ||
| child: Container( | ||
| padding: const EdgeInsets.all(2.0), | ||
| color: Colors.white70, | ||
| child: Text.rich(TextSpan( | ||
| text: "© ", | ||
| style: TextStyle(fontSize: 12), | ||
| children: <TextSpan>[ | ||
| TextSpan( | ||
| text: "OpenStreetMaps", | ||
| style: TextStyle( | ||
| decoration: TextDecoration.underline, | ||
| )), | ||
| TextSpan( | ||
| text: " contributors", | ||
| ) | ||
| ], | ||
| ))), | ||
| ), | ||
| ); | ||
| } | ||
| } |
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