From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sat, 4 Nov 2017 23:46:35 +0000 (+0000)
Subject: introduce cp1scale, cp2scale
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?a=commitdiff_plain;h=93ffb9cf26341b1d017a1d0fb2483f9f45cff886;p=moebius3.git

introduce cp1scale, cp2scale

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---

diff --git a/moebius.py b/moebius.py
index 37b7676..0fd9ce3 100644
--- a/moebius.py
+++ b/moebius.py
@@ -66,9 +66,12 @@ class MoebiusHalf:
     theta = u * tau
     cp = [None] * 4
     cp[0] =               m.edge   .point(theta)
-    cp[1] = cp[0] + 0.75 * m.edge   .dirn (theta)
     cp[3] =               m.midline.point(theta*2)
-    cp[2] = cp[3] + np.linalg.norm(cp[3]) * m.midline.dirn (theta*2)
+    ncp3 = np.linalg.norm(cp[3])
+    cp2scale = ncp3
+    cp1scale = 0.75
+    cp[1] = cp[0] + cp1scale * m.edge   .dirn (theta)
+    cp[2] = cp[3] + cp2scale * m.midline.dirn (theta*2)
     return BezierSegment(cp)
   def point(m, iu, t):
     '''