12 lines
347 B
TypeScript
12 lines
347 B
TypeScript
import { dot, scale, sub, type Vec } from "./given.ts";
|
|
|
|
/**
|
|
* Remove the component of `v` that points into a wall with the given (unit)
|
|
* normal, leaving only the motion that runs along the wall.
|
|
*
|
|
* vSlide = v - normal * dot(v, normal)
|
|
*/
|
|
export function slide(v: Vec, normal: Vec): Vec {
|
|
return sub(v, scale(normal, dot(v, normal)));
|
|
}
|