From dd6b1c27d09b5a7c73bba56f423c4dad1a0a5c27 Mon Sep 17 00:00:00 2001
From: Shaheen Gandhi <shaheen@fb.com>
Date: Tue, 20 Aug 2013 23:28:07 -0700
Subject: [PATCH] [Helix] Fade edges of base pairs

---
 ShaheenGandhi.pde | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ShaheenGandhi.pde b/ShaheenGandhi.pde
index f94e5e4..a4b5532 100644
--- a/ShaheenGandhi.pde
+++ b/ShaheenGandhi.pde
@@ -222,7 +222,8 @@ class HelixPattern extends SCPattern {
     }
     Line spokeLine = basePairs[spokeIndex];
     PVector pointOnSpoke = spokeLine.projectPoint(pt);
-    float b = ((PVector.dist(pt, pointOnSpoke) < spokeGirth) && (PVector.dist(pointOnSpoke, spokeLine.getPoint()) < spokeRadius)) ? 100.f : 0.f;
+    float d = PVector.dist(pt, pointOnSpoke);
+    float b = (PVector.dist(pointOnSpoke, spokeLine.getPoint()) < spokeRadius) ? constrain(100*(1 - ((d-.5*spokeGirth)/(spokeGirth*.5))), 0, 100) : 0.f;
     return color(100, 80.f, b);
   }
 
-- 
2.34.1