apply some code analyzer recommendations

libs/graphic/graphic_conf.h

@@ -49,16 +49,16 @@ struct QAD_GRAPHIC_EXPORT GraphicType {
 	QVector<QPolygonF> _lod;
 	QVector<QPolygonF> _lod_pause;
 	QPen pen;
-	QColor fill_color;
-	bool lines;
-	bool points;
-	bool fill;
-	double pointWidth;
-	double max_x;
-	double max_x_pause;
-	QCheckBox * pb = nullptr;
+	QColor fill_color  = Qt::yellow;
+	bool lines         = true;
+	bool points        = false;
+	bool fill          = false;
+	double pointWidth  = 2.;
+	double max_x       = 0.;
+	double max_x_pause = 0.;
+	QCheckBox * pb     = nullptr;
 	QIcon icon;
-	bool visible;
+	bool visible = true;
 	QRectF cvrect;
 	int last_lod = 0;
 };