💡 Move IFS in special file

2015-12-23 15:53:50 +01:00 · 2015-12-23 15:53:50 +01:00 · e2daa27b9d
parent b8cef3d9bf
commit e2daa27b9d
1 changed files with 28 additions and 0 deletions
--- a/scripts/ifs.js
+++ b/scripts/ifs.js
@ -0,0 +1,28 @@
+'use strict';
+
+const linearTransform = (a, b, c, d, e, f) => point => [
+    a * point[0] + b * point[1] + e,
+    c * point[0] + d * point[1] + f
+];
+
+const polygonTransforms = (vertices, frac) => vertices.map(
+    vertex => linearTransform(
+        frac, 0, 0, frac,
+        vertex[0] * (frac - 1), vertex[1] * (frac - 1)
+    )
+);
+
+export const barnsley = [[
+    linearTransform(0, 0, 0, 0.16, 0, 0),
+    linearTransform(.85, .04, -.04, .85, 0, 1.6),
+    linearTransform(.20, -.26, .23, .22, 0, 1.6),
+    linearTransform(-.15, .28, .26, .24, 0, .44)
+], [
+    .01, .85, .07, .07
+]];
+
+export const sierpinski = [polygonTransforms([
+    [.866, .5],
+    [-.866, .5],
+    [0, -1]
+], 1 / 2), [1 / 3, 1 / 3, 1 / 3]];