Re: [UFO-devel] building an image viewer

[Johannes S. <sch...@us...>]

Hi Ogla,

On Saturday 10 June 2006 11:46, Veli Ogla Sungutay wrote:
> I need to create GUI applications that shows  images on the screen, and let
> the user do simple manipulation stuff: resizing, cropping, renaming etc...
>
> I see there are several Graphics and Image classes in the API; What is the
> path I should take?

It is not that trivial but it is possible.

If you do not care about performance too much (at least in the beginning),
you can use the built-in image class (UImage) and assign this as icon of a 
label (or button).

That means, you create your own image buffer and feed it as RGB(A) data to an 
UImageIO class, create an image and so on.
I have attached a small example (image.cpp) which shows how to do that (based 
on the base.cpp example).
Compile it via:
g++ -o image image.cpp `pkg-config --cflags --libs ufo`

Otherwise you can draw the image yourself using OpenGL methods.
To do this, you have to subclass UWidget and override 
UWidget::paintWidget(UGraphics*) with your own code (set up matrices and 
OpenGL state, draw image, revert OpenGL matrices and states).


Hope that helps,
Johannes