Vertex vert = new Vertex(evt.getX(), evt.getY());
            vertexList.add(vert);

            if (vertexList.toArray().length > 1) {
                Vertex prevVertex = vertexList.get(vertexList.size() - 2);
                drawLineWithVertex(drawPanel.getGraphics(), prevVertex, vert);



public void drawLineWithVertex(Graphics g, Vertex beginVert, Vertex endVert) {
        g.drawLine(beginVert.getX(), beginVert.getY(), endVert.getX(), endVert.getY());
        jTextArea1.setText("");
    }