From da9bf720aa8709331207a628eb31cae4dbd28c97 Mon Sep 17 00:00:00 2001
From: koldo <koldo@f0d560ea-af0d-0410-9eb7-867de7ffcac7>
Date: Sat, 17 Feb 2018 14:32:33 +0000
Subject: [PATCH] ScatterDraw: Added error checking in MaxSubDataImp()

git-svn-id: svn://ultimatepp.org/upp/trunk@11785 f0d560ea-af0d-0410-9eb7-867de7ffcac7
---
 uppsrc/ScatterDraw/DataSource.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/uppsrc/ScatterDraw/DataSource.cpp b/uppsrc/ScatterDraw/DataSource.cpp
index ce9c07c51..f1dbc1f24 100644
--- a/uppsrc/ScatterDraw/DataSource.cpp
+++ b/uppsrc/ScatterDraw/DataSource.cpp
@@ -94,11 +94,12 @@ Pointf DataSource::MaxSubDataImp(Getdatafun getdataY, Getdatafun getdataX, int64
 	}
 	VectorPointf pf(p);
 	PolynomialEquation2 polyFit;
-	polyFit.Fit(pf);
+	if (ExplicitEquation::NoError != polyFit.Fit(pf))
+		return Null;
 	const Vector<double> &coeff = polyFit.GetCoeff();
 	double b = coeff[1];
 	double a = coeff[2];
-	if (IsNull(a) || a < 1E-10)
+	if (IsNull(a) || fabs(a) < 1E-10)
 		return Null;
 	return Pointf(-b/2/a, polyFit.f(-b/2/a));
 }