Irrlicht Engine

It is the "demo" project in the tutorials, originally.

There's 2 things mixed up here. The add is also a factory at the same time to create the object - that's why passing an object won't work (you can't pass the object to a function which is responsible for creating the object). At the same time it's about adding the newly created object to the gui ...

The implementation classes (like CGUISomething) are not available to users. So that way they couldn't create the scrollbar. But I agree that we shouldn't have all those parameters on creation. It makes code a little bit shorter, but I think it would be better and more readable if all the add ...

IGUIScrollBar* CGUIEnvironment::addScrollBar(bool horizontal, const core::rect<s32>& rectangle, IGUIElement* parent, s32 id)

I found interfaces like this common in the engine, and want to know why not:
bool CGUIEnvironment::addScrollBar(CGUIScrollBar * scrollbar)

For example, if a color is ...

Windows 7, with either OpenGL or DirectX 9

Thanks so much.

and does it support 2D game/app developing?

I haved checked http://sourceforge.net/p/irrlicht/code/ ... /branches/, but I can not find the iOS branch?

seems great, try first, thanks.