The following is my TypeScript code:
````typescript
export class VtkWasmRenderComponent extends EmscriptenWasmComponent
implements AfterViewInit, OnDestroy {
.....
.....
.....
vtkCameraChanged(cameraChangeEvent: CameraChangeEvent) {
if (cameraChangeEvent === this.lastCameraChangeEvent) return;
this.lastCameraChangeEvent = cameraChangeEvent;
this.cameraChange.next(cameraChangeEvent);
}
}
````
In my C++ file, I have the following:
````cpp
using namespace emscripten;
/*
extern "C" {
extern void vtkCameraChanged(CameraChangeEvent positionChange);
}
*/
void vtkCallbackFunc(vtkObject* caller, long unsigned int evId,
void* clientData, void* /*callData*/)
{
// Note the use of reinterpret_cast to cast the caller and callData to the
// expected types.
auto interactor = reinterpret_cast<vtkRenderWindowInteractor*>(caller);
std::cout << " Event Id: " << std::endl;
auto renderer = reinterpret_cast<vtkRenderer*>(clientData);
CameraChangeEvent positionChange;
positionChange.position = renderer->GetActiveCamera()->GetPosition();
positionChange.viewAngle = renderer->GetActiveCamera()->GetViewAngle();
positionChange.clippingRange =
renderer->GetActiveCamera()->GetClippingRange();
positionChange.focalPoint =
renderer->GetActiveCamera()->GetFocalPoint();
positionChange.parallelProjection =
renderer->GetActiveCamera()->GetParallelProjection();
positionChange.parallelProjection =
renderer->GetActiveCamera()->GetParallelProjection();
positionChange.viewUp = renderer->GetActiveCamera()->GetViewUp();
positionChange.parallelScale =
renderer->GetActiveCamera()->GetParallelScale();
val vtkWasm = val::global("VtkWasmRenderComponent").new_();
vtkWasm.call<void>("vtkCameraChanged", positionChange); // calling the
vtkCameraChange function
};
````
What is the correct way to call the the `vtkCameraChange` method in the
TypeScript file from the C++ file using emscripten? I have used val as
stated in the
[documentation](https://emscripten.org/docs/porting/connecting_cpp_and_javascript/Interacting-with-code.html#interacting-with-code-call-javascript-from-native),
however, it does not seem to work.
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