Newbie Question: How to set an object's position to the middle of the screen?

[Uk Marine]

Hi everyone, can anyone tell me how to calculate both x and y values of a circle to set its position to the center of the screen? i tried dividing the screen resolution by /2 but it didn't seem to work, can someone please remind me how to do this? Thank you.

mWindow(sf::VideoMode(1280 , 800)
{
   mPlayer.setRadius(40.f);
   mPlayer.setPosition(640.f , 400.f);
   mPlayer.setFillColor(sf::Color::Blue);
}

Result:

[Barlog]

You should use
setOrigin(x,y) to center origin point of a sprite. Set it to half of a size of a sprite;
Or you need to subtract half of width and height of sprite from sprite position each time you reposition your sprite;

[Hapax]

mPlayer.setOrigin(mPlayer.getRadius(), mPlayer.getRadius());

[Nexus]

Unless otherwise specified, you set the left-upper corner of an object with setPosition(). As mentioned by Tirion Helkaraxe, you should set the origin to the center. In the case of a sf::CircleShape, the origin is simply at position (radius, radius).

[Uk Marine]

Thanks for your answers guys, the mPlayer.setOrigin(mPlayer.getRadius(), mPlayer.getRadius()); worked, but why did we do (mPlayer.getRadius(), mPlayer.getRadius) twice?

[Nexus]

X and Y components of the origin. The radius is a scalar, the origin a vector.

[Hapax]

Thanks for your answers guys, the mPlayer.setOrigin(mPlayer.getRadius(), mPlayer.getRadius()); worked, but why did we do (mPlayer.getRadius(), mPlayer.getRadius) twice?

The default origin is the top-left of the boundary box of the circle. To get the origin into the centre, you need to move it radius to the right, and radius down.

[Uk Marine]

Thank you guys so much, really appreciate your help.