stats: fix line segment intersection math

Linear algebra class was a while ago, but somehow this does look more
logical to me.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/stats/statsview.cpp b/stats/statsview.cpp
index 6dd858e96..817f8001d 100644
--- a/stats/statsview.cpp
+++ b/stats/statsview.cpp
@@ -686,9 +686,9 @@ void StatsView::addLinearRegression(double a, double b, double minX, double maxX
 	// but owing to floating point imprecision, let's test again.
 	if ((y1 < minY || y1 > maxY || y2 < minY || y2 > maxY) && fabs(a) > 0.0001) {
 		// Intersections with y = minY and y = maxY lines
-		double intersect_x1 = minY / a - b;
-		double intersect_x2 = maxY / a - b;
-		if (intersect_x1 < intersect_x2)
+		double intersect_x1 = (minY - b) / a;
+		double intersect_x2 = (maxY - b) / a;
+		if (intersect_x1 > intersect_x2)
 			std::swap(intersect_x1, intersect_x2);
 		minX = std::max(minX, intersect_x1);
 		maxX = std::min(maxX, intersect_x2);