From: Keith OHara <k-ohara5a5a@oco.net>
Date: Sat, 24 Aug 2013 06:13:40 +0000 (-0700)
Subject: Skylines: reject steep-sloped buildings; issue 3383
X-Git-Tag: release/2.17.26-1~18^2~3
X-Git-Url: https://git.donarmstrong.com/?a=commitdiff_plain;h=5844c989bd052a41f833a24802260b830123ab51;p=lilypond.git

Skylines: reject steep-sloped buildings; issue 3383
---

diff --git a/lily/skyline.cc b/lily/skyline.cc
index 8654f0d973..70bf989861 100644
--- a/lily/skyline.cc
+++ b/lily/skyline.cc
@@ -125,6 +125,12 @@ Building::precompute (Real start, Real start_height, Real end_height, Real end)
       assert (start_height == end_height);
       y_intercept_ = start_height;
     }
+  else if (fabs(slope_) > 1e6)
+    // too steep to be stored in slope-intercept form, given round-off error
+    {
+      slope_ = 0.0;
+      y_intercept_ = max(start_height, end_height);
+    }
   else
     y_intercept_ = start_height - slope_ * start;
 }