我正在尝试使用拍打着的Google地图将所有标记显示到视口中。但在我看来,这似乎行不通。到目前为止,我已经尝试过:
_controller.animateCamera(CameraUpdate.newLatLngBounds(
LatLngBounds(
southwest: LatLng(23.785182, 90.330702),
northeast: LatLng(24.582782, 88.821163),
),
100
));
LatLngBounds boundsFromLatLngList(List<LatLng> list) {
assert(list.isNotEmpty);
double x0, x1, y0, y1;
for (LatLng latLng in list) {
if (x0 == null) {
x0 = x1 = latLng.latitude;
y0 = y1 = latLng.longitude;
} else {
if (latLng.latitude > x1) x1 = latLng.latitude;
if (latLng.latitude < x0) x0 = latLng.latitude;
if (latLng.longitude > y1) y1 = latLng.longitude;
if (latLng.longitude < y0) y0 = latLng.longitude;
}
}
return LatLngBounds(northeast: LatLng(x1, y1), southwest: LatLng(x0, y0));
}
正如我所见,它总是显示北大西洋的地图 关于此问题是否有任何解决方案,或者Flutter正在开发中?预先感谢
答案 0 :(得分:1)
当我使用CameraUpdate.newLatLngBounds
为地图设置动画时,我在Android上遇到了完全相同的问题(在iOS上工作正常)。设置界限后,它会立即重新定位到北太平洋,不确定是什么原因造成的,但这是一种解决方法-
您可以计算要设置的边界的中心,而不必使用LatLngBounds
来设置地图位置
// the bounds you want to set
LatLngBounds bounds = LatLngBounds(
southwest: LatLng(23.785182, 90.330702),
northeast: LatLng(24.582782, 88.821163),
);
// calculating centre of the bounds
LatLng centerBounds = LatLng(
(bounds.northeast.latitude + bounds.southwest.latitude)/2,
(bounds.northeast.longitude + bounds.southwest.longitude)/2
);
// setting map position to centre to start with
controller.moveCamera(CameraUpdate.newCameraPosition(CameraPosition(
target: centerBounds,
zoom: 17,
)));
zoomToFit(controller, bounds, centerBounds);
将地图位置设置为边界的中心(并放大)后,您需要继续缩小直到可见的地图区域覆盖您要设置的边界。您可以使用controller.getVisibleRegion()
获取可见的地图区域。这是实现-
Future<void> zoomToFit(GoogleMapController controller, LatLngBounds bounds, LatLng centerBounds) async {
bool keepZoomingOut = true;
while(keepZoomingOut) {
final LatLngBounds screenBounds = await controller.getVisibleRegion();
if(fits(bounds, screenBounds)){
keepZoomingOut = false;
final double zoomLevel = await controller.getZoomLevel() - 0.5;
controller.moveCamera(CameraUpdate.newCameraPosition(CameraPosition(
target: centerBounds,
zoom: zoomLevel,
)));
break;
}
else {
// Zooming out by 0.1 zoom level per iteration
final double zoomLevel = await controller.getZoomLevel() - 0.1;
controller.moveCamera(CameraUpdate.newCameraPosition(CameraPosition(
target: centerBounds,
zoom: zoomLevel,
)));
}
}
}
bool fits(LatLngBounds fitBounds, LatLngBounds screenBounds) {
final bool northEastLatitudeCheck = screenBounds.northeast.latitude >= fitBounds.northeast.latitude;
final bool northEastLongitudeCheck = screenBounds.northeast.longitude >= fitBounds.northeast.longitude;
final bool southWestLatitudeCheck = screenBounds.southwest.latitude <= fitBounds.southwest.latitude;
final bool southWestLongitudeCheck = screenBounds.southwest.longitude <= fitBounds.southwest.longitude;
return northEastLatitudeCheck && northEastLongitudeCheck && southWestLatitudeCheck && southWestLongitudeCheck;
}
答案 1 :(得分:0)
我也遇到了这个问题,请尝试将username := rfc2865.UserName_GetString(r.Packet)
password := rfc2865.UserPassword_GetString(r.Packet)
log.Printf("bytes %+v", r.Get(1), string(r.Get(1)))
log.Printf("bytes %+v", r.Get(2), string(r.Get(2)))
log.Printf("u/p %v, %v\n", username, password)
的值替换为southwest
的值
答案 2 :(得分:0)
对我来说有同样的问题:
我并没有真正给出西南和东北坐标,但是: 西北和东南。 iOS 正常处理此问题,但 android 放大了大西洋。
修复后:
final highestLat = points.map((e) => e.latitude).reduce(max);
final highestLong = points.map((e) => e.longitude).reduce(max);
final lowestLat = points.map((e) => e.latitude).reduce(min);
final lowestLong = points.map((e) => e.longitude).reduce(min);
final lowestLatLowestLong = LatLng(lowestLat, lowestLong);
final highestLatHighestLong = LatLng(highestLat, highestLong);
final getRouteBoundsCameraUpdate = CameraUpdate.newLatLngBounds(LatLngBounds(southwest: lowestLatLowestLong, northeast: highestLatHighestLong), 25.0);