[vtkusers] vtkImageData

[Stefan Huber]

Hi

i tried the methode GetScalarPointer befor, but it wasn't working.
i get an array with wrong numbers. my code:

int* writeDataFromImageData(int x, int y){
	int size = x*y;
	int *arr = (int *) malloc(sizeof(int *)*size);
	int l = 0;
	int * p = (int *) img->GetScalarPointer();
	//I think somewhere here is the mistake
	
	for(int i= 0; i< x; i++){
		for (int j= 0; j <y; j++){
			arr[(i*x)+j]= (int)*p;
			p++;
		}  //for
	}  //for
	writeArray(size,arr);
	return arr;
}  //writeDataFromImageData

bool readArray2ImageData(int* dat, int x, int y){
	//write array to vtkimagedata
	try{
		img->SetDimensions(x,y,1);
		img->SetScalarTypeToFloat();
		vtkFloatArray *scalars = vtkFloatArray::New();
		for(int i= 0; i< x; i++){
			for (int j= 0; j <y; j++){
				scalars->InsertTuple1((i*x)+j,dat[i*x+j]);
			}  //for
		}  //for
		img->GetPointData()->SetScalars(scalars);
		img->Update();
		return true;
	} catch(std::bad_alloc &ex){
		return false;
	}  //catch
}  //readArray2ImageData

int* forwardFFT(int *dat, int x, int y){

	if(!readArray2ImageData(dat,x,y))
		return NULL;
	else {
		vtkImageFFT *ffft = vtkImageFFT::New();
		ffft->SetDimensionality(2);
		ffft->SetInput(img);
		ffft->Update();
		img=ffft->GetOutput();
		img->Update();
		img->UpdateData();

		return writeDataFromImageData(x,y);
	}  //else
}  //forwardFFT

can you help me please?

thanx Stefan



-------- Original-Nachricht --------
> Datum: Tue, 08 Apr 2008 08:25:50 -0500
> Von: Amy Squillacote <ahs at cfdrc.com>
> An: Mike Jackson <imikejackson at gmail.com>
> CC: Stefan Huber <Huber.Ste at gmx.at>, vtkusers at vtk.org
> Betreff: Re: [vtkusers] vtkImageData

> You're close; the name of the method is GetScalarPointer(). See 
> http://www.vtk.org/doc/nightly/html/classvtkImageData.html.
> 
> - Amy
> 
> Mike Jackson wrote:
> > I _think_ there is a call in vtkImageData called "GetVoidPointer(0)" 
> > which will return a void pointer to the first element of the array. 
> > Simply cast this to the proper type and do what you need to do.
> >
> 
> -- 
> Amy Squillacote                    Phone: (256) 726-4839
> Computer Scientist                 Fax: (256) 726-4806
> CFD Research Corporation           Web: http://www.cfdrc.com
> 215 Wynn Drive, Suite 501
> Huntsville, AL  35805
> 

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