can move items around. rejoin persistance seems okk

1 files changed, 14 insertions, 1 deletions

diff --git a/test-client/util.ts b/test-client/util.ts
index 99f0c013..6febac37 100644
--- a/test-client/util.ts
+++ b/test-client/util.ts
@@ -2,9 +2,22 @@ export interface V2 { x: number, y: number }
 export function length(p: V2): number { return Math.sqrt(p.x * p.x + p.y * p.y) }
 export function normalize_mut(p: V2) { const l = length(p); if (l == 0) return; p.x /= l; p.y /= l }
 export function normalize(p: V2): V2 { let l = length(p); if (l == 0) l = 1; return { x: p.x / l, y: p.y / l } }
-export function lerp_v2_mut(current: V2, target: V2, dt: number) {
+export function lerp_exp(current: number, target: number, dt: number): number {
+    return target + (current - target) * Math.exp(-dt)
+}
+export function lerp_v2(a: V2, b: V2, t: number): V2 {
+    return {
+        x: a.x * (1 - t) + b.x * t,
+        y: a.y * (1 - t) + b.y * t,
+    }
+}
+export function lerp_exp_v2_mut(current: V2, target: V2, dt: number) {
     current.x = target.x + (current.x - target.x) * Math.exp(-dt)
     current.y = target.y + (current.y - target.y) * Math.exp(-dt)
 }
 export function floor_v2(p: V2): V2 { return { x: Math.floor(p.x), y: Math.floor(p.y) } }
 export function ceil_v2(p: V2): V2 { return { x: Math.ceil(p.x), y: Math.ceil(p.y) } }
+export function add_v2(p: V2, o: V2 | number) {
+    if (typeof o == "number") return { x: p.x + o, y: p.y + o }
+    else return { x: p.x + o.x, y: p.y + o.y }
+}
\ No newline at end of file