Are there any function that could change the coordinates system of window ?

[lyvinhloi.cntt]

Oh .. uhm ...
I want to change the coordinates system of window from the top-left to the bottom-left to easy to draw my sprites.

[Ixrec]

No, although you could use the setOrigin() function on every single one of your Transformables to get the same effect.  Having the origin in the top-left corner is a common convention in computer graphics, so it's best to just get used to it.

[lyvinhloi.cntt]

Thanks for the answer  ..

[FRex]

Try setting your sf::View y size to a negative value, the effect is.. interesting (looks like it's working, but I never used that myself or felt the need for it), maybe you can work with that.

[Laurent]

Inverting the view inverts... everything. Sprites, texts and everything are upside down.

Right now there's no easy way to invert the Y axis in SFML.

[FRex]

Except for Text it's the desired effect it seems.
Wrapping RenderTarget and transforming everything before draw is a way too I guess.
Or just sticking to default for many guis and engines... ('inverted' y)