[orx-noise] Add unseeded method to Random (#175)

orx-noise/src/main/kotlin/Random.kt

@@ -3,6 +3,7 @@ package org.openrndr.extra.noise
 import org.openrndr.math.Vector2
 import org.openrndr.math.Vector3
 import org.openrndr.math.Vector4
+import org.openrndr.shape.Rectangle
 import kotlin.math.ln
 import kotlin.math.max
 import kotlin.math.pow
@@ -10,7 +11,9 @@ import kotlin.math.sqrt
 import org.openrndr.extra.noise.fbm as orxFbm
 import kotlin.random.Random as DefaultRandom
 
-
+/**
+ * Deterministic Random using a seed to guarantee the same random values between iterations
+ */
 object Random {
     var rnd: DefaultRandom
 
@@ -54,6 +57,30 @@ object Random {
         seed = "${seedBase}-${seedTracking}"
     }
 
+    /**
+     * Use this when you want to get non-deterministic values aka random every call
+     *
+     * @param fn
+     */
+    fun unseeded(fn: Random.() -> Unit) {
+        val state = rnd
+        val currentSeed = seed
+
+        rnd = DefaultRandom
+
+        this.fn()
+
+        resetState()
+
+        seed = currentSeed
+        rnd = state
+    }
+
+    /**
+     * Use this inside `extend` methods to get the same result between iterations
+     *
+     * @param fn
+     */
     fun isolated(fn: Random.() -> Unit) {
         val state = rnd
         val currentSeed = seed
@@ -334,5 +361,9 @@ object Random {
 
         return elements.elementAtOrNull(index) ?: elements.last()
     }
+
+    fun point(rect: Rectangle): Vector2 {
+        return rect.position(vector2(0.0, 1.0))
+    }
 }