From 696d81d000c312ab2b26b466430cce873e4fe47e Mon Sep 17 00:00:00 2001
From: akz <akz@opencascade.com>
Date: Thu, 19 Feb 2015 15:14:11 +0300
Subject: [PATCH] 0025823: Self Intersecting wire translated from STEP file

The number of points to divide the edge curve on a segments to compute a
boundary box does not provide a good tolerance. So a resultant boundary
box has an incorrect bounds. As a result the intersection near to a
tangent of curve does not detected.

Test case for issue CR25823
---
 src/ShapeFix/ShapeFix_ComposeShell.cxx |  3 ++-
 tests/bugs/heal/bug25823               | 23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100755 tests/bugs/heal/bug25823

diff --git a/src/ShapeFix/ShapeFix_ComposeShell.cxx b/src/ShapeFix/ShapeFix_ComposeShell.cxx
index 793157ab82..5ef63dc1ae 100644
--- a/src/ShapeFix/ShapeFix_ComposeShell.cxx
+++ b/src/ShapeFix/ShapeFix_ComposeShell.cxx
@@ -1287,7 +1287,8 @@ Standard_Boolean ShapeFix_ComposeShell::SplitByLine (ShapeFix_WireSegment &wire,
       // get bounding box of pcurve
       ShapeAnalysis_Curve sac;
       Bnd_Box2d box;
-      sac.FillBndBox ( c2d, f, l, 11, Standard_True, box );
+      const Standard_Integer aNbPoints = 41;
+      sac.FillBndBox ( c2d, f, l, aNbPoints, Standard_True, box );
       Standard_Real umin, vmin, umax, vmax;
       box.Get ( umin, vmin, umax, vmax );
         
diff --git a/tests/bugs/heal/bug25823 b/tests/bugs/heal/bug25823
new file mode 100755
index 0000000000..47e278bcec
--- /dev/null
+++ b/tests/bugs/heal/bug25823
@@ -0,0 +1,23 @@
+puts "================"
+puts "OCC25823"
+puts "================"
+puts ""
+#######################################################################################
+# Self Intersecting wire translated from STEP file
+#######################################################################################
+
+set BugNumber OCC25823
+
+set aFile [locate_data_file bug25823_280612.stp]
+stepread $aFile a *
+set aLog [checkshape a_1]
+
+if {$aLog == "This shape seems to be valid" } {
+  puts "OK ${BugNumber}"
+} else {
+  puts "Faulty ${BugNumber}"
+}
+
+smallview
+fit
+set only_screen_axo 1