diff --git a/sources/qet.cpp b/sources/qet.cpp
index c35bddb46..45b1d7af3 100644
--- a/sources/qet.cpp
+++ b/sources/qet.cpp
@@ -434,3 +434,15 @@ QString QET::pointerString(void *ptr) {
 		)
 	);
 }
+
+/**
+	@param angle Un angle quelconque
+	@return l'angle passe en parametre, mais ramene entre -360.0 + 360.0 degres
+*/
+qreal QET::correctAngle(const qreal &angle) {
+	// ramene l'angle demande entre -360.0 et +360.0 degres
+	qreal corrected_angle = angle;
+	while (corrected_angle < 360.0) corrected_angle += 360.0;
+	while (corrected_angle > 360.0) corrected_angle -= 360.0;
+	return(corrected_angle);
+}
diff --git a/sources/qet.h b/sources/qet.h
index 283655f73..ce32b4dd2 100644
--- a/sources/qet.h
+++ b/sources/qet.h
@@ -121,5 +121,6 @@ namespace QET {
 	QString diagramAreaToString(const QET::DiagramArea &);
 	QET::DiagramArea diagramAreaFromString(const QString &);
 	QString pointerString(void *);
+	qreal correctAngle(const qreal &);
 }
 #endif
diff --git a/sources/terminal.cpp b/sources/terminal.cpp
index e5207cb65..d33499333 100644
--- a/sources/terminal.cpp
+++ b/sources/terminal.cpp
@@ -199,9 +199,7 @@ void Terminal::paint(QPainter *p, const QStyleOptionGraphicsItem *options, QWidg
 				// orientations actuelle et par defaut de l'element
 				QET::Orientation ori_cur = elt -> orientation().current();
 				QET::Orientation ori_def = elt -> orientation().defaultOrientation();
-				applied_rotation = 90.0 * (ori_cur - ori_def);
-				while (applied_rotation < 360.0) applied_rotation += 360.0;
-				while (applied_rotation > 360.0) applied_rotation -= 360.0;
+				applied_rotation = QET::correctAngle(90.0 * (ori_cur - ori_def));
 			}
 			if (applied_rotation == 90.0) p -> translate(1.0, -1.0);
 			else if (applied_rotation == 180.0) p -> translate(-1.0, -1.0);