import javax.swing.JPanel;
import java.awt.Graphics;
import java.awt.Polygon;
public class PolygonsPanel extends JPanel {
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
int xCenter=getWidth()/2;
int yCenter=getHeight()/2;
int radius=(int)(Math.min(getWidth(), getHeight()*0.4));
Polygon polygon=new Polygon();
polygon.addPoint(xCenter+radius,yCenter);
polygon.addPoint((int)(xCenter+radius*Math.cos(2*Math.PI/6)), (int)(yCenter-radius*Math.sin(2*Math.PI/6)));
polygon.addPoint((int)(xCenter+radius*Math.cos(2*2*Math.PI/6)),(int)(yCenter-radius*Math.sin(2*2*Math.PI/6)));
polygon.addPoint((int)(xCenter+radius*Math.cos(2*3*Math.PI/6)),(int)(yCenter-radius*Math.sin(2*3*Math.PI/6)));
polygon.addPoint((int)(xCenter+radius*Math.cos(2*4*Math.PI/6)),(int)(yCenter-radius*Math.sin(2*4*Math.PI/6)));
polygon.addPoint((int)(xCenter+radius*Math.cos(2*5*Math.PI/6)),(int)(yCenter-radius*Math.sin(2*5*Math.PI/6)));
g.drawPolygon(polygon);
}
}
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Graphics;
import java.awt.Polygon;
public class DrawPolygon extends JFrame{
public DrawPolygon()
{
setTitle("DrawPolygon");
add(new PolygonsPanel());
}
public static void main(String[] args)
{
DrawPolygon frame =new DrawPolygon();
frame.setSize(200,250);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}