Re: Help with understanding QwtRasterData needed

Uwe Rathmann schrieb:
> On Wednesday 16 April 2008 18:09, Matthias Pospiech wrote:
>
>   
>> I now created my own SpectrogramData version. But in the end I found out
>> that SpectrogramData fails to use my own values in the value function.
>>     
>
> Your implementation of copy returns an uninitialized data object - not a 
> clone. 
>
>   
It is the copy from the example code. I have no idea how to change it to 
be correct.
> I recommend to use one of the Qt containers (f.e QVector or QList ) instead of 
> the plain double arrays. These containers implicitely share your data, what 
> makes copying an unexpensive operation and the handling of the memory is much 
> easier. Especially if you don't feel comfortable with C/C++, you should use 
> them.
>   
I have to deal with no-Qt libaries, especially math libaries which 
require double arrays. Using QVector arrays would definetly be nicer, 
but would mean that I have to copy the array multiple times between each 
libary. The way I implemented it is how it works across the whole Code 
so far and I understand that part.

Matthias

-------------------------------------------------------------------------
This SF.net email is sponsored by the 2008 JavaOne(SM) Conference 
Don't miss this year's exciting event. There's still time to save $100. 
Use priority code J8TL2D2. 
http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone