Java圖形 - 像Zelle的Python圖形一樣簡單

Question

我是Java的新手，我只是想簡單地得到一些類似於Python的Zelle's graphics。

Answer 1

Java類Graphics和Graphics2D應該包含Zelle的圖形包含的大部分內容。

下面是一些Java Swing代碼，以幫助您入門。只要按住鼠標左鍵，該Java應用程序就會用鼠標繪製。當您釋放鼠標左鍵時，屏幕會消失，您可以繪製其他東西。

import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.Point; 
import java.awt.event.MouseEvent; 
import java.io.File; 
import java.util.ArrayList; 
import java.util.List; 

import javax.swing.JFileChooser; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.SwingUtilities; 
import javax.swing.event.MouseInputAdapter; 

public class DrawingTest implements Runnable { 

    private JFrame frame; 

    private MyDrawPanel drawPanel; 

    private List<Point> points; 

    public DrawingTest() { 
     points = new ArrayList<Point>(); 
    } 

    @Override 
    public void run() { 
     frame = new JFrame("Bouncing Vertices"); 

     drawPanel = new MyDrawPanel(this); 
     MyListener alpha = new MyListener(this); 
     drawPanel.addMouseMotionListener(alpha); 
     drawPanel.addMouseListener(alpha); 

     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.getContentPane().add(drawPanel); 
     frame.setSize(800, 600); 
     frame.setVisible(true); 
    } 

    public JPanel getDrawingPanel() { 
     return drawPanel; 
    } 

    public List<Point> getPoints() { 
     return points; 
    } 

    public void setPoint(int x, int y) { 
     points.add(new Point(x, y)); 
    } 

    public void resetPoints() { 
     points.clear(); 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new DrawingTest()); 
    } 

    private class MyListener extends MouseInputAdapter { 

     private DrawingTest drawingTest; 

     public MyListener(DrawingTest drawingTest) { 
      this.drawingTest = drawingTest; 
     } 

     @Override 
     public void mouseDragged(MouseEvent event) { 
      drawingTest.setPoint(event.getX(), event.getY()); 
      drawingTest.getDrawingPanel().repaint(); 
     } 

     @Override 
     public void mouseReleased(MouseEvent event) { 
      drawingTest.resetPoints(); 
     } 

    } 

    private class MyDrawPanel extends JPanel { 

     private static final long serialVersionUID = 1L; 
     private DrawingTest drawingTest; 

     public MyDrawPanel(DrawingTest drawingTest) { 
      this.drawingTest = drawingTest; 
     } 

     @Override 
     public void paintComponent(Graphics g) { 
      g.setColor(Color.WHITE); 
      g.fillRect(0, 0, this.getWidth(), this.getHeight()); 
      g.setColor(Color.BLUE); 
      for (int i = 1; i < drawingTest.getPoints().size(); i++) { 
       Point p1 = drawingTest.getPoints().get(i - 1); 
       Point p2 = drawingTest.getPoints().get(i); 
       g.drawLine(p1.x, p1.y, p2.x, p2.y); 
      } 
     } 
    } 

} 

代碼中的最後一個方法paintComponent方法是使用Graphics方法的地方。