Disegno di una linea in grassetto con drawLine() Quando si estende su tela

Question

Dato il seguente:

public class NavigationCanvas extends Canvas implements MouseListener,MouseMotionListener,KeyListener { 

    public void paint(Graphics g) 
    { 

     // some code 
     // more 
     // ... 

     g.setColor(Color.black); 

     // drawing each Line 
     for (int i=0; i<length; i++) 
     { 
      Line2D currLine = m_lines.get(i); 

      g.drawLine((int)currLine.getX1(),(int)currLine.getY1(), 
       (int)currLine.getX2(),(int)currLine.getY2()); 
      g.drawLine((int)currLine.getX1()+1,(int)currLine.getY1()+1 
       ,(int)currLine.getX2()+1,(int)currLine.getY2()+1); 
      g.drawLine((int)currLine.getX1()+2,(int)currLine.getY1()+2 
       ,(int)currLine.getX2()+2,(int)currLine.getY2()+2); 
     } 


    }  
    ... 
} 

Quando disegno le linee di currLine ottengo questo:

Come si può vedere, Ho effettuato 3 chiamate a drawline(), per renderlo più in grassetto, ma non è ancora del tutto come volevo.

Come posso disegnare una linea in grassetto?

Answer 1

Graphics2D#setStroke controlla lo stile della linea che è dipinto. BasicStroke è l'implementazione predefinita di Stroke e ha un numero di parametri, quello che ti interessa di più è la larghezza.

import java.awt.BasicStroke; 
import java.awt.BorderLayout; 
import java.awt.Dimension; 
import java.awt.EventQueue; 
import java.awt.Graphics; 
import java.awt.Graphics2D; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.UIManager; 
import javax.swing.UnsupportedLookAndFeelException; 

public class TestStroke { 

    public static void main(String[] args) { 
     new TestStroke(); 
    } 

    public TestStroke() { 
     EventQueue.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       try { 
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
       } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { 
       } 

       JFrame frame = new JFrame("Testing"); 
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
       frame.setLayout(new BorderLayout()); 
       frame.add(new TestPane()); 
       frame.pack(); 
       frame.setLocationRelativeTo(null); 
       frame.setVisible(true); 
      } 
     }); 
    } 

    public class TestPane extends JPanel { 

     @Override 
     public Dimension getPreferredSize() { 
      return new Dimension(200, 200); 
     } 

     @Override 
     protected void paintComponent(Graphics g) { 
      super.paintComponent(g); 
      Graphics2D g2d = (Graphics2D) g.create(); 

      int width = getWidth(); 
      int height = getHeight(); 

      int xDif = width/4; 
      int yDif = height/4; 

      g2d.setStroke(new BasicStroke(1, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND)); 
      g2d.drawLine(xDif, yDif, width - xDif, yDif); 
      g2d.setStroke(new BasicStroke(2, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND)); 
      g2d.drawLine(width - xDif, yDif, width - xDif, height - yDif); 
      g2d.setStroke(new BasicStroke(3, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND)); 
      g2d.drawLine(width - xDif, height - yDif, xDif, height - yDif); 
      g2d.setStroke(new BasicStroke(4, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND)); 
      g2d.drawLine(xDif, height - yDif, xDif, yDif); 

      g2d.dispose(); 
     } 

    } 

} 

Dai un'occhiata alla Stroking and filling Graphics Primitives per maggiori dettagli

Answer 2

utilizzare il metodo setStroke() situato nella biblioteca Graphics: http://docs.oracle.com/javase/1.5.0/docs/api/java/awt/Graphics2D.html

setStroke(Stroke s) 
    Sets the Stroke for the Graphics2D context. 

Ci vuole un oggetto Stroke, http://docs.oracle.com/javase/1.5.0/docs/api/java/awt/Stroke.html