GeneralPath with Stroke - Java 2D Graphics

Java examples for 2D Graphics:Path

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Description

GeneralPath with Stroke

Demo Code

     /*from   w w w .  ja v a2 s .  c  om*/

import java.awt.BasicStroke;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Stroke;
import java.awt.geom.GeneralPath;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main extends JFrame
{
     private JPanel panel;
     
     public static void main(String[] arg)
     {
          JFrame frame = new Main();
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
         frame.setSize(new Dimension(400,400));
         frame.pack();
         frame.setVisible(true);
     }
     
     public Main()
     {
          super("Programming Exercise 3.6");
          JPanel contentPanel = new JPanel(new FlowLayout());
          panel = new DrawIt();
          panel.setPreferredSize(new Dimension(400,400));
          contentPanel.add(panel);
          add(contentPanel);
     }
     
     private GeneralPath drawCorners(int corners, int lineLength)
     {
         GeneralPath e = new GeneralPath(GeneralPath.WIND_EVEN_ODD, corners);
         double angle_to_turn = 2 * Math.PI / corners;
         double angle = angle_to_turn;
         
         int x = 0;
         int y = 0;
         e.moveTo(x, y);
         
         for(int i = 0; i < corners; i++)
         {
              x = x + (int)(Math.cos(angle) * lineLength);
              y = y + (int)(Math.sin(angle) * lineLength);
          
              e.lineTo(x, y);
              angle += angle_to_turn;
         }
         e.closePath();
         
         return e;
     }
     
     class DrawIt extends JPanel
     {
          public void paintComponent(Graphics g)
          {
               super.paintComponent(g);
               Graphics2D g2 = (Graphics2D)g;
               
               g2.translate(panel.getWidth()/2, panel.getHeight()/4);
               
               GeneralPath gp = drawCorners(5,100);
               Stroke s = new BasicStroke(20, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
               g2.setStroke(s);
               g2.draw(gp);
          }
     }
}

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