一.继承、多态、抽象类与方法和画图的综合运用
package HomeWork12_12;
import javax.swing.JFrame;
public class DrawTest
{
public static void main(String[] args)
{
JFrame jFrame=new ShapeFrame();
jFrame.setVisible(true);
}
}
package HomeWork12_12;
import java.awt.Color;
import java.awt.Graphics;
/*
* 画图系统：
* 图形：
* 坐标、颜色
* 周长，面积，画图
* 支持画圆，矩形，等边三角形
*
*/
/**
* 图形类
* @author YY
*
*/
public abstract class Shape
{
protected int centerx;
protected int centery;
protected Color color;
/**
* 构造器
* @param x 中心x坐标
* @param y 中心y坐标
* @param color 要画的颜色
*/
protected Shape(int x,int y,Color color)
{
this.centerx=x;
this.centery=y;
this.color=color;
}
/**
* 周长
* @return
*/
public abstract double perimeter();
/**
* 面积
* @return
*/
public abstract double area();
/**
* 画图
* @param g
*/
public void draw(Graphics g)
{
g.setColor(color);
g.drawString("周长:"+perimeter(), centerx, centery);
g.drawString("面积:"+area(), centerx, centery+20);
}
}
package HomeWork12_12;
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
@SuppressWarnings("serial")
public class ShapeFrame extends JFrame
{
private Circle circle=new Circle(300, 150, Color.RED, 100);
private Rectangle rectangle=new Rectangle(400, 350, Color.BLUE,200,300);
private Triangle triangle=new Triangle(500, 150, Color.GREEN, 200);
public ShapeFrame()
{
this.setTitle("绘图");
this.setSize(800, 600);
this.setResizable(false);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public void paint(Graphics g)
{
super.paint(g);
circle.draw(g);
rectangle.draw(g);
triangle.draw(g);
}
}
package HomeWork12_12;
import java.awt.Color;
import java.awt.Graphics;
public class Circle extends Shape
{
private int radius;
public Circle(int x, int y, Color color,int radius)
{
super(x, y, color);
this.radius=radius;
}
@Override
public double perimeter()
{
return 2*Math.PI*radius;
}
@Override
public double area()
{
return Math.PI*radius*radius;
}
@Override
public void draw(Graphics g)
{
super.draw(g);
g.drawOval(centerx-radius, centery-radius, 2*radius, 2*radius);
}
}
package HomeWork12_12;
import java.awt.Color;
import java.awt.Graphics;
public class Rectangle extends Shape
{
private int height;
private int width;
protected Rectangle(int x, int y, Color color,int height,int width)
{
super(x, y, color);
this.height=height;
this.width=width;
}
@Override
public double perimeter()
{
return 2*(height+width);
}
@Override
public double area()
{
return height*width;
}
@Override
public void draw(Graphics g)
{
super.draw(g);
g.drawRect(centerx-width/2, centery-height/2, width, height);
}
}
package HomeWork12_12;
import java.awt.Color;
import java.awt.Graphics;
public class Triangle extends Shape
{
private int side;
public Triangle(int x, int y, Color color,int side)
{
super(x, y, color);
this.side=side;
}
@Override
public double perimeter()
{
return 3*side;
}
@Override
public double area()
{
return side*side*Math.sqrt(3)/4;
}
@Override
public void draw(Graphics g)
{
super.draw(g);
int x1=centerx;
int y1=(int)(centery-side/2.0/Math.cos(Math.PI/6));
int x2=centerx-side/2;
int y2=(int)(centery+Math.tan(Math.PI/6)*side/2);
int x3=centerx+side/2;
int y3=y2;
g.drawLine(x1, y1, x2, y2);
g.drawLine(x2, y2, x3, y3);
g.drawLine(x3, y3, x1, y1);
}
}
二.国际象棋棋盘
package Day12_13_02;
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
@SuppressWarnings("serial")
public class Chess extends JFrame
{
public Chess()
{
this.setTitle("国际象棋");
this.setSize(600, 620);
this.setLocationRelativeTo(null);
this.setResizable(false);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public void paint(Graphics g)
{
super.paint(g);
g.drawRect(15, 35, 570, 570);
for (int j = 0; j < 8; j++)
{
for (int i = 0; i < 8; i++)
{
g.setColor((i + j) % 2 == 0 ? new Color(210, 220, 162) : new Color(179, 56, 89));
g.fillRect(20+j*70, 40+i*70, 70, 70);
}
}
}
}
package Day12_13_02;
public class ChessTest
{
public static void main(String[] args)
{
Chess chess=new Chess();
chess.setVisible(true);
}
}
