Draw Polyline in JMapViewer [closed]

Answer 1

AFAIK JMapViewer extends JPanel.

Therefore you just override paintComponent and use the given Graphics object.

class MyMap extends JMapViewer {
    @Override
    protected void paintComponent(Graphics g){
        super.paintComponent(g);
        g.setColor(Color.RED);
        g.drawPolyline(...);
    }   
}