How can I make it possible to leave a mark from the dot when cleaning the canvas?

Question

Canvas

Good afternoon. I'm doing a simple animation of a geometric task on canvas/js. Interested in how to implement so that all moving elements of the drawing move, and key points show the trajectory of their movement.

Answer 1

Render what should leave a trace on a separate canvas, each time clearing it not 100%.
Then, send the result to the main canvas, which can be cleaned every frame.