convert static method
- required Projection from,
- required ProjectionType toType,
- void onComplete(
- GemError err,
- Projection? result
Async method that returns the projection result from an input projection.
Parameters
- IN type The type of projection to cast to.
- IN from The input projection that needs to be converted.
- IN onComplete Callback for the operation completion.
- err GemError The error code returned by the operation.
- GemError.success and a non-null Projection if the conversion was successfully completed
- GemError.notSupported and null if the conversion cannot be done
- GemError.internalAbort and null if the result parsing failed or server internal error occurred
Returns
- A TaskHandler that can be used to track the progress of the operation or null if it failed.
Implementation
static TaskHandler? convert({
required Projection from,
required ProjectionType toType,
final void Function(GemError err, Projection? result)? onComplete,
}) {
final EventDrivenProgressListener progListener =
EventDrivenProgressListener();
late Projection result;
switch (toType) {
case ProjectionType.bng:
result = BNGProjection(easting: 0, northing: 0);
case ProjectionType.lam:
result = LAMProjection(x: 0, y: 0);
case ProjectionType.utm:
result =
UTMProjection(x: 0, y: 0, zone: 0, hemisphere: Hemisphere.north);
case ProjectionType.mgrs:
result = MGRSProjection(easting: 0, northing: 0, zone: '', letters: '');
case ProjectionType.gk:
result = GKProjection(x: 0, y: 0, zone: 0);
case ProjectionType.wgs84:
result = WGS84Projection(Coordinates());
case ProjectionType.w3w:
result = W3WProjection('');
case ProjectionType.undefined:
throw UnimplementedError();
}
GemKitPlatform.instance.registerEventHandler(progListener.id, progListener);
progListener.registerOnCompleteWithData((
final int err,
final String hint,
final Map<dynamic, dynamic> json,
) {
GemKitPlatform.instance.unregisterEventHandler(progListener.id);
if (err == GemError.success.code) {
onComplete?.call(GemErrorExtension.fromCode(err), result);
} else {
onComplete?.call(GemErrorExtension.fromCode(err), null);
}
});
final OperationResult resultString = staticMethod(
'ProjectionService',
'convert',
args: <String, dynamic>{
'from': from._pointerId,
'to': result._pointerId,
'listener': progListener.id,
},
);
final GemError errorCode =
GemErrorExtension.fromCode(resultString['result']);
if (errorCode != GemError.success) {
onComplete?.call(errorCode, null);
return null;
}
return TaskHandlerImpl(progListener.id);
}