+ graphicView->preview.clear();
+
+ graphicView->preview.addEntity(new Line(&(graphicView->preview),
+ LineData(Vector(v1.x, v1.y), Vector(v2.x, v1.y))));
+ graphicView->preview.addEntity(new Line(&(graphicView->preview),
+ LineData(Vector(v2.x, v1.y), Vector(v2.x, v2.y))));
+ graphicView->preview.addEntity(new Line(&(graphicView->preview),
+ LineData(Vector(v2.x, v2.y), Vector(v1.x, v2.y))));
+ graphicView->preview.addEntity(new Line(&(graphicView->preview),
+ LineData(Vector(v1.x, v2.y), Vector(v1.x, v1.y))));