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【Java】Java绘图技术与事件处理机制，

来源： javaer 分享于  点击 27600 次 点评：91

【Java】Java绘图技术与事件处理机制，


摘要：本文主要通过实例讲解Java中绘图技术与事件处理机制

 // 此程序用来练习使用绘图技术!
  // Version:1.0
  // @Author:Yongchun_zha
  package cha08;
  import java.awt.*;
  import javax.swing.*;
  public class L8_1 extends JFrame
   {
   wdmb panl=null;
   public static void main(String[] args)
   {
    L81 l81=new L8_1();
   }
   public L8_1()
   {
    panl=new wdmb();
    this.add(panl);

    this.setTitle("Layout");//设置用户界面
    this.setSize(500,500);//设置窗口大小，数字代表像素
    this.setLocation(300,260);//设置窗体位置
    //this.setResizable(false);//设置窗体大小是否可调整
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭进程
    this.setVisible(true);//true 显示，false不显示

   }
  }

  class wdmb extends JPanel
  {
   public void paint(Graphics g)
   {
    //绘制图形
    g.setColor(Color.CYAN);//设置颜色
    g.drawOval(50, 50, 80, 80);
    g.drawLine(100,100,200,200);
    g.drawRect(100,100,200,200);
    g.draw3DRect(200,200,400,400,true);
    g.fillRect(10,10,20,20);//绘制填充图形

    //绘制图像
    Image tp=Toolkit.getDefaultToolkit().getImage(Panel.class.getResource("/notebook.jpg"));
    g.drawImage(tp,100,80,20,20,this);
    //注：绘图用到的图片要拷贝到src目录下

    //绘制文字
    g.setColor(Color.RED);
    g.setFont(new Font("华文彩云",Font.BOLD,50));
    g.drawString("Hi,大家好",200,100);
   }
   //paint方法在以下三种情况下会被系统自动调用：①启动程序 ②窗口大小发生变化 ③调用repaint函数
  }

  • 事件监听

    // 此程序用来练习使用事件监听!
// Version:1.0
// @Author:Yongchun_zha
package cha08;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class L8_2 extends JFrame implements ActionListener//接口实现监听
{
wdmb2 pa=null;
JButton bon1,bon2;

public static void main(String[] args)
{
L82 l82=new L8_2();
}

public L8_2()
{
pa=new wdmb2();
pa.setBackground(Color.CYAN);

bon1=new JButton("红色");
bon2=new JButton("蓝色");

this.setLayout(new BorderLayout());

this.add(bon1,BorderLayout.NORTH);
this.add(bon2, BorderLayout.SOUTH);
this.add(pa);

bon1.addActionListener(this);//this表示监听的是本类，按需添加所需监听的类即可
bon1.setActionCommand("111");//可以对多个类进行监听
bon2.addActionListener(this);
bon2.setActionCommand("222");

this.setTitle("Layout");//设置用户界面
this.setSize(500,500);//设置窗口大小，数字代表像素
this.setLocation(300,260);//设置窗体位置
this.setResizable(false);//设置窗体大小是否可调整
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭进程
   this.setVisible(true);//true 显示，false不显示
}

public void actionPerformed(ActionEvent e)//接口的抽象构造函数
{
System.out.println("按钮起作用了！");

if(e.getActionCommand().equals("111"))
{
 System.out.println("红色红色");
 pa.setBackground(Color.RED);
}

else if(e.getActionCommand().equals("222"))
{
 System.out.println("蓝色蓝色");
 pa.setBackground(Color.BLUE);
}
}

}
class wdmb2 extends JPanel
{
public void paint(Graphics g)
{
super.paint(g);
}
}

  • 键盘监听

    // 此程序用来练习使用事件监听!
// Version:1.0
// @Author:Yongchun_zha
package cha08;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class L8_3 extends JFrame
{
wdmb4 pan=null;

public static void main(String[] args)
{
L83 l83=new L8_3();
}

public L8_3()
{
pan=new wdmb4();

this.add(pan);
this.addKeyListener(pan);

this.setTitle("Layout");//设置用户界面
this.setSize(500,500);//设置窗口大小，数字代表像素
this.setLocation(300,260);//设置窗体位置
this.setResizable(false);//设置窗体大小是否可调整
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭进程
   this.setVisible(true);//true 显示，false不显示

}
}
class wdmb4 extends JPanel implements KeyListener
{
int x=100, y=100;

public void paint(Graphics g)
{
super.paint(g);
   g.fillRect(x,y,30,30);

}

public void keyTyped(KeyEvent e)
{
//有字符输出的函数
}

public void keyPressed(KeyEvent e)
{
System.out.println("键盘被按下: "+(char)e.getKeyCode());
if(e.getKeyCode()==KeyEvent.VK_DOWN)
{
 System.out.println("Down");
 y+=10;
}

else if(e.getKeyCode()==KeyEvent.VK_UP)
{
 System.out.println("Up");
 y-=10;
}

else if(e.getKeyCode()==KeyEvent.VK_RIGHT)
{
 System.out.println("Right");
 x+=10;
}

else if(e.getKeyCode()==KeyEvent.VK_LEFT)
{
 System.out.println("Left");
 x-=10;
}

this.repaint();

}

public void keyReleased(KeyEvent e)
{
//按键抬起
}
}

  • 鼠标监听

    // 此程序用来练习使用鼠标监听!
// Version:1.0
// @Author:Yongchun_zha
package cha08;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class L8_4 extends JFrame
{
wdmb5 panl=null;

public static void main(String[] args)
{
L84 l84=new L8_4();
}
public L8_4()
{
panl=new wdmb5();

this.add(panl);

this.addMouseListener(panl);
this.addMouseMotionListener(panl);

this.setTitle("Layout");//设置用户界面
this.setSize(500,500);//设置窗口大小，数字代表像素
this.setLocation(300,260);//设置窗体位置
this.setResizable(false);//设置窗体大小是否可调整
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭进程
   this.setVisible(true);//true 显示，false不显示

}
}
class wdmb5 extends JPanel implements MouseListener,MouseMotionListener
{
public void paint(Graphics g)
{
super.paint(g);
}

public void mouseClicked(MouseEvent e) //鼠标单击
{
System.out.print("鼠标点击的位置是： ");
System.out.println("("+e.getX()+","+e.getY()+")");
}

public void mousePressed(MouseEvent e)
  {
   System.out.println("鼠标被按下");
}

  public void mouseReleased(MouseEvent e)
{
System.out.println("鼠标被松开");
}

public void mouseEntered(MouseEvent e)
{
System.out.println("鼠标移动到界面中");
}

public void mouseExited(MouseEvent e)
  {
   System.out.println("鼠标离开界面");
}

public void mouseDragged(MouseEvent e)
{
System.out.println("鼠标当前位置是：");
System.out.println("("+e.getX()+","+e.getY()+")");
}

public void mouseMoved(MouseEvent e)
{
System.out.println("鼠标当前位置是：");
System.out.println("("+e.getX()+","+e.getY()+")");
}
}

  • 窗口监听

    // 此程序用来练习使用窗口监听!
// Version:1.0
// @Author:Yongchun_zha
package cha08;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class L8_5 extends JFrame
{
  Wdmb6 mb=null;

  public static void main(String[] args)
  {
   L85 lx=new L85();
}

L8_5()
{
mb=new Wdmb6();
this.add(mb);
this.addWindowListener(mb);


this.setSize(400,300);
this.setLocation(300,280);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
}
class Wdmb6 extends JPanel implements WindowListener
{
public void paint(Graphics g)
{
super.paint(g);
}
@Override
public void windowOpened(WindowEvent e)
{
System.out.println("窗口打开");
}
public void windowClosing(WindowEvent e)
{
 System.out.println("窗口关闭");
}
  public void windowClosed(WindowEvent e)
  {
}
  public void windowIconified(WindowEvent e)
  {
   System.out.println("最小化");
}
public void windowDeiconified(WindowEvent e)
{
System.out.println("从最小化变成正常");
}
public void windowActivated(WindowEvent e)
{
System.out.println("窗口被激活");
}
public void windowDeactivated(WindowEvent e)
{

}
}

    ​

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