p1p2.startXProperty().bind(triangleArea.x1Property());
        p1p2.startYProperty().bind(triangleArea.y1Property());
        p1p2.endXProperty().bind(triangleArea.x2Property());
        p1p2.endYProperty().bind(triangleArea.y2Property());

        p2p3.startXProperty().bind(triangleArea.x2Property());
        p2p3.startYProperty().bind(triangleArea.y2Property());
        p2p3.endXProperty().bind(triangleArea.x3Property());
        p2p3.endYProperty().bind(triangleArea.y3Property());

        p3p1.startXProperty().bind(triangleArea.x3Property());
        p3p1.startYProperty().bind(triangleArea.y3Property());
        p3p1.endXProperty().bind(triangleArea.x1Property());
        p3p1.endYProperty().bind(triangleArea.y1Property());