How to make a game like wofenshtein 3D?

Question

JavaScript

I would like to make a game like wolfenshtein 3D on js canvas. But I have a problem. I don't know how to rotate the ray that the player throws. Rotate the very coordinate of the end of the ray. I couldn’t implement it. Yes, I know there are lessons on the Internet. But I would like to learn only this part. Then I myself. Thanks to everyone.

Answer 1

First, the beam has no end, only a beginning. You probably have a cut.

x = cos(fi) * R
y = sin(fi) * R

fi - angle in radians: (degrees divided by 180 and multiplied by Pi)
R - radius.
If your player is not at coordinate zero, then add his coordinates:

x = cos(fi) * R + x_игрока
y = sin(fi) * R + y_игрока