java 语言程序设计中的题目，单单画了一个图形，为何？

胖子吴 2016-07-27 10:01:51



import javax.swing.*;

import java.awt.*;

public class TestFigurePaint extends JFrame{

	

	TestFigurePaint(){

		setLayout(new GridLayout(2,3,5,5));

		add(new FigurePaint(FigurePaint.LINE));

		add(new FigurePaint(FigurePaint.RECTANGLE));

		add(new FigurePaint(FigurePaint.ROUND_RECTANGLE));

		add(new FigurePaint(FigurePaint.OVAL));

		add(new FigurePaint(FigurePaint.RECTANGLE,true));

		add(new FigurePaint(FigurePaint.ROUND_RECTANGLE,true));

	}

	public static void main(String[] args){

		

		TestFigurePaint frame = new TestFigurePaint();

		frame.setSize(800,400);

		frame.setLocationRelativeTo(null);

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		frame.setVisible(true);

	}



}

class FigurePaint 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;

	private boolean isFilled;

	

	public FigurePaint(int type){

		this.type = type;

	}

	public FigurePaint(int type,boolean isFilled){

		this.type = type;

		this.isFilled = isFilled;

	}

	

	protected void paintComponent(Graphics g){

		

		int width = getWidth();

		int height = getHeight();

		System.out.println(type + " " + width + " " + height);

		

		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(isFilled)

				g.fillRect((int)0.1*width, (int)0.1*height, (int)0.8*width, (int)0.8*height);

			else

				g.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(isFilled)

				g.fillRoundRect((int)0.1*width, (int)0.1*height, (int)0.8*width, (int)0.8*height,20,20);

			else

				g.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(isFilled)

				g.fillOval((int)0.1*width, (int)0.1*height, (int)0.8*width, (int)0.8*height);

			else

				g.drawOval((int)0.1*width, (int)0.1*height, (int)0.8*width, (int)0.8*height);

			break;

		}

	}

//	public Dimension getPreferredSize(){

//		return new Dimension(80,80);

//	}

}