randomXY

src/engine/random.ts

@@ -1,8 +1,12 @@
-import { MAXIMUM_INTEGER } from "../math"
+import { MAXIMUM_INTEGER, PI } from "../math"
 
 const getRandomInt = GetRandomInt
 const getRandomReal = GetRandomReal
 
+const cos = math.cos
+const sin = math.sin
+const sqrt = math.sqrt
+
 export const randomAngle = (): number => getRandomReal(0, 360)
 
 export const randomInteger: {
@@ -16,3 +20,13 @@ export const randomFloat: {
     (lowerBound: number, upperBound: number): number
 } = (m?: number, n?: number): number =>
     n != undefined ? getRandomReal(m!, n) : getRandomReal(0, m ?? MAXIMUM_INTEGER)
+
+export const randomXY = (
+    centerX: number,
+    centerY: number,
+    range: number
+): LuaMultiReturn<[x: number, y: number]> => {
+    const r = range * sqrt(getRandomReal(0, 1))
+    const t = getRandomReal(0, 1) * 2 * PI
+    return $multi(centerX + r * cos(t), centerY + r * sin(t))
+}