多态练手 Java绘图板

/***
DrawFrame 类文件内容：


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*****/

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Checkbox;
import java.awt.CheckboxGroup;
import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Label;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import javax.swing.JOptionPane;

public class DrawFrame extends Frame {

CheckboxGroup cbg = new CheckboxGroup();
CheckboxGroup shapecbg = new CheckboxGroup();
CheckboxGroup shapeFillcbg = new CheckboxGroup();

Button btn_String =new Button("插入文字");



DrawPanel drawPanel   = new DrawPanel(this);




public void setFrame() {

   Button btn_clear = new Button("清屏");
   btn_clear.addActionListener(new ActionListener(){
    public void actionPerformed(ActionEvent e) {
     drawPanel.shapes.removeAll(drawPanel.shapes);
     drawPanel.repaint();
     drawPanel.shape = null;
    }
   
   });
  
  
  
   Label lab1 = new Label("ControlGroup");
   btn_clear.setBackground(Color.LIGHT_GRAY);

   Panel paramPanel = new Panel();
  
  

   paramPanel.setLayout(new GridLayout(3, 3));

   Checkbox cb1 = new Checkbox("Black", cbg, true);
   Checkbox cb2 = new Checkbox("Red", cbg, false);
   Checkbox cb3 = new Checkbox("Blue", cbg, false);

   Checkbox shapecb1 = new Checkbox("线", shapecbg, true);
   Checkbox shapecb2 = new Checkbox("圆", shapecbg, false);
   Checkbox shapecb3 = new Checkbox("方", shapecbg, false);
  
   Checkbox shapeFillcb1 = new Checkbox("实心", shapeFillcbg, false);
   Checkbox shapeFillcb2 = new Checkbox("空心", shapeFillcbg, true);
  
  

   paramPanel.add(cb1);
   paramPanel.add(cb2);
   paramPanel.add(cb3);

   paramPanel.add(lab1);

   paramPanel.add(shapecb1);
   paramPanel.add(shapecb2);
   paramPanel.add(shapecb3);
  
   //paramPanel.add(new Label());
  

  

   paramPanel.add(btn_clear);
  
  
   paramPanel.add(shapeFillcb1);
   paramPanel.add(shapeFillcb2);
  
   btn_String.addActionListener(new ActionListener(){
    public void actionPerformed(ActionEvent e){
     String str=JOptionPane.showInputDialog("输入字符 ");
     drawPanel.str=str;
    
    
    }
   });
  
   paramPanel.add(btn_String);

   paramPanel.setBackground(Color.LIGHT_GRAY);
  
  
  

   this.add(paramPanel, BorderLayout.NORTH);
   this.add(drawPanel,BorderLayout.CENTER);

   this.setSize(400, 400);
   this.setLocation(200, 200);
  
  
  
   this.addWindowListener(new WindowAdapter(){
    public void windowClosing(WindowEvent e){
     System.exit(0);
    }
   });
  
   this.setVisible(true);

}



public static void main(String[] args) {
   DrawFrame dp=new DrawFrame();
   dp.setFrame();

}

}




DrawPanel 文件代码：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Panel;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseWheelListener;
import java.util.ArrayList;


public class DrawPanel extends Panel {
DrawFrame df;
ArrayList<Shape> shapes =new ArrayList<Shape>();

//Graphics g = getGraphics();

Shape shape = null;

String str = null;

public DrawPanel(DrawFrame df){
   this.df=df;
   this.setBackground(Color.yellow);
   this.addMouseListener(new MousePaint1());
   this.addMouseMotionListener(new MousePaint2());
  
  
  
}


public void paint(Graphics g) {
   if(shape!= null)shape.draw(g);
   this.drawShape(g);
  
  
}
private Color getColor() {
   if(df.cbg.getSelectedCheckbox().getLabel()=="Blue")
       return Color.blue;
   if(df.cbg.getSelectedCheckbox().getLabel()=="Red")
    return Color.red;
   if(df.cbg.getSelectedCheckbox().getLabel()=="Black")
    return Color.black;
   return Color.black;
  
  
}
private Shape getShape() {
//System.out.println("return share");
   if(str != null)
    return new Word();
   if(df.shapecbg.getSelectedCheckbox().getLabel()=="线")
       return new Line();
   if(df.shapecbg.getSelectedCheckbox().getLabel()=="方")
    return new Rec();
   if(df.shapecbg.getSelectedCheckbox().getLabel()=="圆")
    return new Circular();
  
  
   return new Line();
  
  
}

private boolean getFill(){
   if(df.shapeFillcbg.getSelectedCheckbox().getLabel()=="实心")
       return true;
   return false;
}

private void drawShape(Graphics g){
   for(int i=0; i<shapes.size(); i++){
    shapes.get(i).draw(g);
   
   }
}

class MousePaint1 extends MouseAdapter   {


public void mousePressed(MouseEvent e) {
   shape=getShape();
//shape=new Shape();
   shape.x = e.getX();
   shape.y = e.getY();
   shape.c = getColor();
   shape.fill=getFill();
   shape.str=str;
//shape.g = g;
//System.out.println("Press");
  
}


public void mouseReleased(MouseEvent e) {
   if(shape != null)
   shapes.add(shape);
   shape = null;
   str = null;
   repaint();
  
System.out.println(shapes.size());
  
}


}

class MousePaint2 extends MouseMotionAdapter {

public void mouseDragged(MouseEvent e) {
  
   shape.x1=e.getX();
   shape.y1=e.getY();
   //shape.draw(g);
   repaint();
//System.out.println("draw current");
  
}

public void mouseMoved(MouseEvent e) {
  
  
}


}


}


Shape 文件代码，这是所有图形的父类，以此实现多态：

import java.awt.Color;
import java.awt.Graphics;


public class Shape {

int x;
int y;
int x1;
int y1;
int width;
int height;
Color c;
String str = null;
boolean fill = false;

//Graphics g;

public void draw(Graphics g) {
//System.out.println("shape draws");
//g.draw3DRect(20, 20, 20, 20, true);
  
}

public int getDrawX(){
   if(x>x1)return x1;
   return x;
}
public int getDrawY(){
   if(y>y1)return y1;
   return y;
}
public int getWidth() {
   return Math.abs(x-x1);
}
public int getHeight() {
   return Math.abs(y-y1);
}

}



Line 文件代码：

import java.awt.Color;
import java.awt.Graphics;


public class Line extends Shape {



public void draw(Graphics g) {
  
//System.out.println("draw line");  
   Color currcolor=g.getColor();
   g.setColor(c);
   g.drawLine(x, y, x1, y1);
   g.setColor(currcolor);
}



}



Rec 文件代码：

import java.awt.Color;
import java.awt.Graphics;


public class Rec extends Shape {


public void draw(Graphics g) {
  
  
  
  
   Color currcolor=g.getColor();
   g.setColor(c);
  
   if(this.fill==true){
    g.fill3DRect(this.getDrawX(),this.getDrawY(), this.getWidth(), this.getHeight(), true);
   }
   else 
    g.draw3DRect(this.getDrawX(),this.getDrawY(), this.getWidth(), this.getHeight(), true);
   
   g.setColor(currcolor);
    
}

}



Word 文件代码：

import java.awt.Color;
import java.awt.Graphics;


public class Word extends Shape {

public void draw(Graphics g) {
  
   Color currcolor=g.getColor();
   g.setColor(c);
  
   g.drawString(str, x, y);
System.out.println("word");
   
   g.setColor(currcolor);
}

}