Add 1d noise versions, Gaussian noise, noise gradients, 4D fractal functions

orx-noise/src/test/kotlin/TestGradient.kt

@@ -0,0 +1,33 @@
+import org.openrndr.extra.noise.*
+import org.spekframework.spek2.Spek
+import org.spekframework.spek2.style.specification.describe
+import kotlin.test.assertEquals
+
+object TestGradient : Spek({
+    describe("Noise") {
+        it("has a gradient") {
+            gradient(::perlinLinear, 100, 0.1)
+        }
+    }
+
+    describe("FBM noise func") {
+        it("has a gradient") {
+            val func = fbmFunc1D(::perlinLinear)
+            gradient(func, 100, 0.1)
+        }
+    }
+
+    describe("Billow noise func") {
+        it("has a gradient") {
+            val func = billowFunc1D(::perlinLinear)
+            gradient(func, 100, 0.1)
+        }
+    }
+
+    describe("Rigid noise func") {
+        it("has a gradient") {
+            val func = rigidFunc1D(::perlinLinear)
+            gradient(func, 100, 0.1)
+        }
+    }
+})