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From Jittery Finch, 7 Years ago, written in Plain Text.
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  1.   Vertex vert = new Vertex(evt.getX(), evt.getY());
  2.             vertexList.add(vert);
  3.  
  4.             if (vertexList.toArray().length > 1) {
  5.                 Vertex prevVertex = vertexList.get(vertexList.size() - 2);
  6.                 drawLineWithVertex(drawPanel.getGraphics(), prevVertex, vert);
  7.  
  8.  
  9.  
  10. public void drawLineWithVertex(Graphics g, Vertex beginVert, Vertex endVert) {
  11.         g.drawLine(beginVert.getX(), beginVert.getY(), endVert.getX(), endVert.getY());
  12.         jTextArea1.setText("");
  13.     }
  14.    
  15.