Where could I have made a mistake while working with canvas?

Question

JavaScript

I wanted to make the pendulum work when the start button is pressed, but it just returns and that's it

Answer 1

To be honest, it doesn't make much sense to figure out where and how you made a mistake. Because the way you chose... well, nobody does that. The coordinates are calculated not by some crazy selection of values, but based on the length of the pendulum and the angle of rotation. For example .