Java day 05丶07

Java第九天#

package day 0507;

import java.awt.Color;
import java.awt.Graphics;
/**
 * 图形（抽象的不能实例化）
 * @author A
 *
 */
public abstract class Shape {
	protected int x1, y1;  //开始坐标
	protected int x2, y2;   //结束坐标
	protected Color color;
	/**
	 * 绘图（抽象方法留给子类重写）
	 * @param g 画笔
	 */
	public abstract void draw(Graphics g);

	public int getX1() {
		return x1;
	}

	public void setX1(int x1) {
		this.x1 = x1;
	}
	public int getY1() {
		return y1;
	}

	public void setY1(int y1) {
		this.y1 = y1;
	}

	public int getX2() {
		return x2;
	}

	public void setX2(int x2) {
		this.x2 = x2;
	}

	public int getY2() {
		return y2;
	}

	public void setY2(int y2) {
		this.y2 = y2;
	}

	public void setColor(Color color) {
		this.color = color;
	}
***********************

package day0507;
/*
*
*重写画圆的方法
*/
import java.awt.Graphics;

public class Oval extends Shape {

	@Override
	public void draw(Graphics g) {
		int width = Math.abs(x1 - x2);
		int height = Math.abs(y1 - y2);		
		int x = x1 < x2? x1 : x2;
		int y = y1 < y2? y1 : y2;
		g.setColor(color);
		g.drawOval(x, y, width, height);
	}

}
*************************
package day0507;
/*
*
*重写画线条的方法
*/
import java.awt.Graphics;

public class Line extends Shape {

	@Override
	public void draw(Graphics g) {
		g.setColor(color);
		g.drawLine(x1, y1, x2, y2);

	}

}
***********************
package day 0507;
/*
*
*重写画矩型的方法
*/
import java.awt.Graphics;

public class Rectangle extends Shape {

	@Override
	public void draw(Graphics g) {
		int width = Math.abs(x1 - x2);
		int height = Math.abs(y1 - y2);		
		int x = x1 < x2? x1 : x2;
		int y = y1 < y2? y1 : y2;
		g.setColor(color);
		g.drawRect(x, y, width, height);
	}

}

**********************
package day 0507;

import java.awt.Color;

public final class MyUtil {
	private MyUtil() {
		
	}
	/**
	 * 产生指定范围内的随机数
	 * @param min  最小值（闭区间）
	 * @param max  最大值（闭区间）
	 * @return 指定范围内的随机数
	 */
	public static int random(int min , int max) {
		return (int) (Math.random() * (max -min +1) +min);
	}
	
	public static Color randomColor() {
		int r = random(0,255);
		int g = random(0,255);;
		int b = random(0,255);;
		return new Color(r,g,b);
	}
	
}



}
*********************
package day 0507;

import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

import mt.shape.Rectangle;
import mt.shape.Line;
import mt.shape.Oval;
import mt.shape.Shape;
import mt.util.MyUtil;

@SuppressWarnings("serial")
public class MyFrame extends JFrame {
	
	private class ButtonHandler implements ActionListener{

		@Override
		public void actionPerformed(ActionEvent e) {
			String commond =e.getActionCommand();
			if (commond.equals("Line")) {
				shape = line;
			}
			else if (commond.equals("Oval")) {
				shape =oval ;
			}
			else {		
				shape = rect;
			}
		
			shape.setX1(MyUtil.random(0, 800));
			shape.setY1(MyUtil.random(0, 600));
			shape.setX2(MyUtil.random(0, 800));
			shape.setY2(MyUtil.random(0, 600));
			shape.setColor(MyUtil.randomColor());
			repaint();
		}
		
	}
	private JButton ovalButton, rectButton, lineButton;
	private	Shape shape=null;
	private Line line = new Line();	
	private Oval oval= new Oval();
	private Rectangle rect = new Rectangle();

	public MyFrame() {
		this.setTitle("青春之歌"); // 标题
		this.setSize(800, 600); // 大小
		this.setResizable(false); // 是否能调整大小
		this.setLocationRelativeTo(null); //
		this.setDefaultCloseOperation(EXIT_ON_CLOSE);

		lineButton = new JButton("Line");
		ovalButton = new JButton("Oval");
		rectButton = new JButton("Rect");
		
		ActionListener handler = new ButtonHandler();
		
		lineButton.addActionListener(handler);
		ovalButton.addActionListener(handler);
		rectButton.addActionListener(handler);
		
		this.setLayout(new FlowLayout());//设置流水按钮
		this.add(lineButton);
		this.add(ovalButton);
		this.add(rectButton);

	}

	@Override
	public void paint(Graphics g) {
		super.paint(g);	
		if (shape != null) {
			shape.draw(g);
		int a=Math.abs(shape.getX1()-shape.getX2());//宽
		int b=Math.abs(shape.getY1()-shape.getY2());//高
		if (shape==line) {
			int L=(int) Math.sqrt((a+b)*(a+b));
			g.drawString("长度"+L, 100, 100);//划字符串
		}
		if (shape==oval) {
			int L =(int) ((a+b)/2*Math.PI);
			int S=(int) (Math.PI*a*b);
			g.drawString("周长="+L,100,100);
			g.drawString("面积="+S,100,120);
		}
		if (shape==rect) {
			int L=(a+b)*2;
			int S=a*b;
			g.drawString("周长="+L,100,100);
			g.drawString("面积="+S,100,120);
		}
		}}
	}

**************************
package day 0507;

import mt.iu.MyFrame;

public class Test {
	public static void main(String[] args) {
		new MyFrame().setVisible(true);  //匿名对象
	}
}