[vtkusers] quick vtkImageData question

[David Doria]

On Mon, Apr 26, 2010 at 2:35 PM, John Durkin <jrd5084 at psu.edu> wrote:
> Nevermind fixed it.  I was mixing up i and j and forgot to increment ptr2.
> Fixed below
>
>         for(int i = 0; i < 720; i++)
>         {
>             for(int j = 0; j < 720; j++)
>             {
>                 if(j <600 && j > 119 && i < 680 && i > 39)
>                 {
>                     *ptr = *ptr2;
>                     *ptr++;
>                     *ptr2++;
>                     *ptr = *ptr2;
>                     *ptr++;
>                     *ptr2++;
>                     *ptr = *ptr2;
>                     *ptr++;
>                     *ptr2++;
>
>
>                 }
>                 else
>                 {
>                     *ptr++;
>                     *ptr++;
>                     *ptr++;
>
>
>                 }
>
>
>
>             }
>
>         }
>
> On Mon, Apr 26, 2010 at 2:27 PM, John Durkin <jrd5084 at psu.edu> wrote:
>>
>> Hi vtk community,
>>
>> I can't seem to remember how the data is represented in vtkImageData.  I
>> have a 720x720x1 3 component RGB image being represented by vtkImageData.  I
>> am using imageData->GetScalarPointer() to access the data.  I have another
>> image 480x640x1 3 component RGB that I want to place in the middle of the
>> new image.  Here is the code I have but its not lining up correctly.  Any
>> ideas?
>>
>>
>> thanks,
>>
>> John
>>
>>
>>     ptr = (unsigned char*)imageData->GetScalarPointer();
>>         unsigned char *ptr2 = (unsigned
>> char*)origData->GetScalarPointer();
>>
>>
>>         for(int i = 0; i < 720; i++)
>>         {
>>             for(int j = 0; j < 720; j++)
>>             {
>>                 if(i <600 && i > 119 && j <680 && j > 39)
>>                 {
>>                     *ptr = *ptr2;
>>                     *ptr++;
>>                     *ptr = *ptr2;
>>                     *ptr++;
>>                     *ptr = *ptr2;
>>                     *ptr++;
>>
>>
>>                 }
>>                 else
>>                 {
>>                     *ptr++;
>>                     *ptr++;
>>                     *ptr++;
>>
>>
>>                 }
>>
>>
>>
>>             }
>> }
>

I'm glad you got it working, but I thought I'd make sure you were
aware of these classes. I think you could use a combination of
vtkImageMask, vtkImageConstantPad and vtkImageMathematics to do
something like this.

Dave