FigurePanel类的实例

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import java.awt.*;import javax.swing.*;public class TestFigurePanel  extends JFrame{public TestFigurePanel(){setLayout(new GridLayout(2,3,5,5));add(new FigurePanel(FigurePanel.LINE));add(new FigurePanel(FigurePanel.RECTANGLE));add(new FigurePanel(FigurePanel.ROUND_RECTANGLE));add(new FigurePanel(FigurePanel.OVAL));add(new FigurePanel(FigurePanel.RECTANGLE,true));add(new FigurePanel(FigurePanel.ROUND_RECTANGLE,true));}public static void main(String[] args){TestFigurePanel frame=new TestFigurePanel();frame.setTitle("TestFigurePanel");frame.setSize(400, 200);frame.setLocationRelativeTo(null);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setVisible(true);}}

import java.awt.*;import javax.swing.*;public class FigurePanel extends JPanel{public static final int LINE=1;public static final int RECTANGLE=2;    public static final int ROUND_RECTANGLE=3;    public static final int OVAL=4;    private int type=1;    private boolean filled=false;    public FigurePanel(){    }    public FigurePanel(int type){    this.type=type;    }    public FigurePanel(int type,boolean filled ){    this.type=type;    this.filled=filled;    }protected void paintComponent(Graphics g){super.paintComponent(g);int width=getWidth();int height=getHeight();switch(type){case LINE:g.setColor(Color.BLACK);g.drawLine(10,10,width-10,height-10);g.drawLine(width-10, 10, 10, height-10);break;case RECTANGLE:g.setColor(Color.BLUE);if(filled)g.fillRect((int)(0.1*width),(int)(0.1*height),(int)(0.8*width),(int)(0.8*height));elseg.drawRect((int)(0.1*width),(int)(0.1*height),(int)(0.8*width),(int)(0.8*height));break;case ROUND_RECTANGLE:g.setColor(Color.RED);if(filled)g.fillRoundRect((int)(0.1*width), (int)(0.1*height), (int)(0.8*width),(int)(0.8*height), 20, 20);elseg.drawRoundRect((int)(0.1*width), (int)(0.1*height), (int)(0.8*width),(int)(0.8*height), 20, 20);break;case OVAL:g.setColor(Color.BLACK);if(filled)g.fillOval((int)(0.1*width),(int)(0.1*height),(int)(0.8*width),(int)(0.8*height));elseg.drawOval((int)(0.1*width),(int)(0.1*height),(int)(0.8*width),(int)(0.8*height));break;}}public void setType(int type){this.type=type;repaint();}public int getType(){return type;}public void setFilled(boolean filled){this.filled=filled;}public boolean isFilled(){return filled;}public Dimension getPreferredSize(){return new Dimension(80,80);}}

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