sf::View and render target

[Ockonal]

Hello, I have a few questions about how views are working.

    sf::RenderWindow *mApp;
    sf::View *mCamera;
    sf::RenderTexture *mRenderTarget;

So first, everything is rendered into mRenderTarget and at the end of the game cycle I draw final image to mApp.

Here is the function which initializes camera and reinitializes it when window is resized:

void DisplayManager::InitializeCamera(const sf::FloatRect &rect)
{
    // This is automatically called when window is resized
    mCamera->reset(rect);
    mApp->setView(*mCamera);

    mRenderTarget->create(rect.width, rect.height);
    mRenderTarget->setView(*mCamera);
}
 

And it looks like:

    mRenderTarget->display();
    mApp->draw(sf::Sprite(mRenderTarget->getTexture()));
    mApp->display();

The questions:
Is that code right?
How does views work? When I change some parameters of it I have to reinitialize render target and/or window with same view:

         mCamera->zoom(0.96);
        //mApp>setView(*mCamera);  // Required?
        mRenerTarget->setView(*mCamera);

Should I set view to render target only (everything is drawn onto it first)? And why should I setView again and again after any change to the view object? If sf::Window (abstract) takes in arguments address of the view why doesn't it track the changes inside the object?

And the last: when I want to use sf::Window::convertCoords, should I call it from renderTarget (sf::RenderTextuer) or mApp (sf::RenderWindow)?

Thanks

[Laurent]

First, a general comment: why are you using pointers everywhere? None of these objects need to be allocated dynamically. You're complicating your code uselessly.

Is that code right?

Right for what? We don't even know what you're trying to do

How does views work?

There's the 1.6 tutorial, the 2.0 documentation and a very good article on the wiki. I can't explain it better in a forum post.

When I change some parameters of it I have to reinitialize render target and/or window with same view

why should I setView again and again after any change to the view object?

It is explained in the documentation: render-targets handle views by value, which means that they take a copy and not a reference/pointer of your own view. Which means that you must call setView everytime it changes.

when I want to use sf::Window::convertCoords, should I call it from renderTarget (sf::RenderTextuer) or mApp (sf::RenderWindow)?

Call it where it makes sense for your application. We can't answer this question for you.

[eXpl0it3r]

I've written a tutorial of a way to look at sf::View and I tried to cover different use cases: Using sf::View

[Ockonal]

Wow, the tutorial is great! Thanks