Java_DrawLine

最新推荐文章于 2024-04-20 17:50:29 发布

原创最新推荐文章于 2024-04-20 17:50:29 发布 · 5.2k 阅读

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文章标签：

#java #newline #action #string #框架

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这是一个使用Java Swing构建的简单绘图应用程序，允许用户通过点击并拖动鼠标来绘制线条，并提供了开始、结束和重画按钮来控制绘图过程。

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主函数所在类：

package EulerOperation;
import javax.swing.JFrame;
public class MainFunction {
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub 
        MainFrame aFrame = new MainFrame();
        aFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        aFrame.setVisible(true);
    }
}

框架类：

package EulerOperation;
import java.awt.*;
import javax.swing.*;
public class MainFrame extends JFrame {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    public MainFrame()
    {
        this.setTitle("EulerOperation");
        this.setLocation(250,250);
        this.setSize(800, 600);
        
        MainPanel aPanel = new MainPanel();
        Container content = this.getContentPane();
        content.add(aPanel);
    }
}

Panel类：

package EulerOperation;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
import java.util.*;
public class MainPanel extends JPanel {
    
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    public MainPanel()
    {
    
        startButton = new JButton("Start");
        endButton = new JButton("End");
        repaintButton = new JButton("Repaint");
        
        ButtonAction action = new ButtonAction();
        startButton.addActionListener(action);
        endButton.addActionListener(action);
        repaintButton.addActionListener(action);
        
        this.add(startButton);
        this.add(endButton);
        this.add(repaintButton);
        
        arrayLines = new ArrayList<Line2D.Double>();
        p1 = new Point2D.Double(0.0,0.0);
        p2 = new Point2D.Double(0.0,0.0);
        p3 = new Point2D.Double(0.0,0.0);
        line = new Line2D.Double(p1,p3);
        startPoint = new Point2D.Double(0.0,0.0);
        endPoint = new Point2D.Double(0.0,0.0);
        
        start = false;
        end = false;
        flag = true;
        
        endButton.setEnabled(false);
        repaintButton.setEnabled(false);
        
        this.addMouseListener(new MouseHandler());
        this.addMouseMotionListener(new MouseMotionHandler());
    }
    
    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        
        if(start || end)
        {
            g2.draw(line);
            
            for(int i=0; i<arrayLines.size(); i++)
                g2.draw(arrayLines.get(i));
            if(end)
                end = false;
        }
    }
    
    
    private class MouseHandler extends MouseAdapter
    {
        public void mousePressed(MouseEvent e)
        {
            if(start || end)
            {
                if(flag)
                {
                    Point2D p = (Point2D)e.getPoint();
                    p1 = p;
                    startPoint = p;
                }
                else
                {
                    p1 = p2;
                }
            
            }
        }
        
        public void mouseReleased(MouseEvent e)
        {
            if(start || end)
            {
                Point2D p = (Point2D)e.getPoint();
                p2 = p;
                Line2D.Double tmpLine = new Line2D.Double(p1,p2);
                arrayLines.add(tmpLine);
                
                flag = false;
                endPoint = p;
                repaint();
            }
        }
    }
    
    private class MouseMotionHandler extends MouseMotionAdapter
    {
        public void mouseDragged(MouseEvent e)
        {
            if(start || end)
            {
                p3 = e.getPoint();
                line = new Line2D.Double(p1,p3);
                repaint();
            }
        }
    }
    
    private class ButtonAction implements ActionListener 
    {
        public void actionPerformed(ActionEvent e)
        {
            if(e.getActionCommand().equals("Start"))
            {
                start = true;
                startButton.setEnabled(false);
                endButton.setEnabled(true);
                repaintButton.setEnabled(true);
            }
            else if(e.getActionCommand().equals("End"))
            {
                start = false;
                end = true;
                Line2D.Double tmpLine = new Line2D.Double(startPoint,endPoint);
                arrayLines.add(tmpLine);
                endButton.setEnabled(false);
                repaint();
            }
            else if(e.getSource()== repaintButton)
            {
                start = false;
                end = false;
                flag = true;
                arrayLines.clear();
                startButton.setEnabled(true);
                endButton.setEnabled(false);
                repaint();
            }
        }
    }
    
    private Point2D startPoint;
    private Point2D endPoint;
    private Point2D p1;
    private Point2D p2;
    private Point2D p3;
    private Line2D line;
    private boolean flag;
    private boolean start;
    private boolean end;
    private JButton startButton;
    private JButton endButton;
    private JButton repaintButton;
    private ArrayList<Line2D.Double> arrayLines;
    
}