You can't connect the joystick directly to the PI's GPIOs, you need an ADC chip in-between.
Take a look at https://grantwinney.com/connecting-an-analog-joystick-to-the-raspberry-pi-and-using-it-with-an-rgb-led-to-simulate-a-color-wheel/, which uses an MCP 3008 to connect a joystick to the PI.

HI,
You can find my web site here :), all is done :)
After the Home page, You can change the langage.
Thanks

@bassman6805 @emitjans
Please, use a recent web browser like Edge or Firefox to have the better user experience on my web site :),