幾何圖形：最近的一對點

本週我在java的作業中有點困難。問題聽起來像這樣：「編寫一個讓用戶點擊面板動態創建點的程序，最初，面板是空的，當面板有兩個或更多點時，突出顯示最近點對，每當一個新的（提示：將點存儲在一個ArrayList中）「幾何圖形：最近的一對點

在下面的代碼中，我嘗試過使用小圓圈來顯示點，並使用實心圓來突出顯示點創建一個CircleMouse類的ArrayList，但我不知道這是否是「正確」的方式來做到這一點？另外，如何在ArrayList中顯示圓時顯示圓？

import java.awt.*; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 
import java.awt.event.MouseMotionListener; 
import java.util.ArrayList; 

import javax.swing.*; 

class ClosestPairOfPoints extends JFrame { 

    /** FRIE VARIABLER **/ 
    int x, y; 

    /*** ARRAYLIST MED ALLE SIRKLENE ***/ 
    public ArrayList<CircleMouse> arrCircle = new ArrayList <CircleMouse>(); 

    public ClosestPairOfPoints() { 
    /*** PANEL FOR Å HOLDE PÅ SIRKLENE ***/ 
    JPanel circlePanel = new JPanel(); 
    circlePanel.setSize(500, 400); 
    circlePanel.setLocation(0, 0); 
    circlePanel.setBackground(Color.PINK); 

    /*** HENTER CIRCLEMOUSE KLASSEN INN ***/ 
    CircleMouse circleMouse = new CircleMouse(); 
    circlePanel.addMouseListener(circleMouse); 
    circlePanel.addMouseMotionListener(circleMouse); 

    /*** LEGGER PANELET INN I FRAMEN ***/ 
    add(circlePanel); 

} 

/*** CIRCLEMOTION KLASSEN ***/ 
class CircleMouse extends JPanel implements MouseListener, MouseMotionListener { 

    public void paintComponent (Graphics g) { 
     super.paintComponent(g); 
     g.setColor(Color.BLUE); 
     g.drawOval(x, y, 15, 15); 
    } 

    @Override 
    public void mouseDragged(MouseEvent e) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void mouseMoved(MouseEvent e) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void mouseClicked(MouseEvent e) { 
     x = e.getX(); 
     y = e.getY(); 
     repaint(); 


    } 

    @Override 
    public void mouseEntered(MouseEvent e) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void mouseExited(MouseEvent e) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void mousePressed(MouseEvent e) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void mouseReleased(MouseEvent e) { 
     // TODO Auto-generated method stub 

    } 

} 

public static void main(String[] args) { 
    ClosestPairOfPoints frame = new ClosestPairOfPoints(); 
    frame.setTitle("Øving 1 - Oppgave 1: Closest Pair Of Points"); 
    frame.setLocationRelativeTo(null); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    frame.setSize(500, 400); 
    frame.setVisible(true); 
}

}

來源

2014-01-22 user3018925

我試圖讓CircleMouse類

的ArrayList聽起來並不完全正確。你應該有ArrayList的Point。每次mouseClicked被調用時，你應該從MouseEvent給它添加Point，那麼你的paintComponent方法，你應該遍歷這個列表，並繪製「點」

爲例子...

來源

2014-01-22 19:45:07 MadProgrammer

這聽起來對我來說更爲正確。你有任何例子或參考？我會更仔細地看看代碼，看看我是否能找到它。感謝您的建議！ – user3018925

幾何圖形：最近的一對點

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