www.pudn.com > Myhomework.rar > Myhomework.java

package mycode; 
 
import java.awt.*; 
import java.awt.event.ComponentEvent; 
import java.awt.event.ComponentListener; 
import java.awt.event.ItemEvent; 
import java.awt.event.ItemListener; 
 
import javax.swing.*; 
 
public class Myhomework extends JFrame { 
	private static final Graphics g = null; 
 
	private CheckboxGroup cg1; 
 
	int width1 = 200, height1 = 200; 
 
	public Myhomework() { 
		super("GUI 程序设计"); 
 
		Container container = getContentPane();// 利用getcontentpane() 向面板中添加组件 
		// container.setBackground(Color.green);//设置背景颜色 
		setLayout(new BorderLayout());// 布局方式 
 
		this.setSize(500, 500); 
 
		MyPanel panel = new MyPanel();// 新建一个panel 
 
		container.add(panel, BorderLayout.CENTER); 
 
		this.setVisible(true); 
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
 
	} 
 
	private class MyPanel extends JPanel implements ComponentListener, 
			ItemListener { 
 
		private JLabel lable;// 设置标签，利用显示文字 
 
		private ImageIcon image; 
 
		private Checkbox cb1, cb2, cb3, cb4;// 设计副选筐实现 
 
		private int n = 1; 
 
		public MyPanel() { 
			image = new ImageIcon("mycode/image.gif"); 
			lable = new JLabel("GUI程序设计", image, SwingConstants.LEFT);// 创建图片标签 
			lable.setSize(1800, 1800); 
 
			cg1 = new CheckboxGroup(); 
			cb1 = new Checkbox("半圆", cg1, true); 
			cb2 = new Checkbox("正六变形", cg1, false); 
			cb3 = new Checkbox("坐标函数", cg1, false); 
			cb4 = new Checkbox("极坐标函数", cg1, false);// 创建选项框 
			addComponentListener((ComponentListener) this); 
			cb1.addItemListener(this); 
			cb2.addItemListener(this); 
			cb3.addItemListener(this); 
			cb4.addItemListener(this);// 注册监听器 
 
			add(cb1); 
			add(cb2); 
			add(cb3); 
			add(cb4); 
			add(lable); 
			// 向panel中添加组件 
		} 
 
		// 绘制图象的函数 
		public void paintComponent(Graphics g) { 
			super.paintComponent(g); 
 
			// System.out.println(n); 
			switch (n) { 
			case 1: 
				g.setColor(Color.RED); 
				Paint_by(g); 
				break; 
			case 2: 
				g.setColor(Color.BLUE); 
				Paint_6(g); 
				break; 
			case 3: 
				g.setColor(Color.BLACK); 
				paint_herat(g); 
				break; 
			case 4: 
				g.setColor(Color.red); 
				paint_luanxuan(g); 
			default: 
				break; 
			} 
 
		} 
 
		// 画半圆 
		public void Paint_by(Graphics g) { 
 
			int x0, y0; // 原点坐标 
			x0 = width1 / 2; 
			y0 = height1 / 2; 
			g.drawLine(x0, 0, x0, height1); 
			g.drawLine(0, y0, width1, y0); 
			int radius = 500;// 半径 
 
			int arcAngle = 180;// 弧的角度 
			// 画线 
			g.drawLine(x0 - 250, y0 - 250, x0 + 250, y0 - 250);// 设置圆的位置根据坐标进行设置 
			// 画弧 
			g.drawArc(x0 - 250, y0 - 500, radius, radius, arcAngle, arcAngle); 
 
		} 
 
		// 画正六边形 
		public void Paint_6(Graphics g) { 
			int x0, y0; // 原点坐标 
			x0 = width1 / 2; 
			y0 = height1 / 2; 
			g.drawLine(x0, 0, x0, height1); 
			g.drawLine(0, y0, width1, y0);// 直角坐标系的设置 
			int radius = 500;// 半径 
			Polygon p = new Polygon(); 
 
			radius /= 2; 
 
			for (int i = 0; i < 6; i++) 
				// 画正6边形 
				p.addPoint((int) (x0 + radius * Math.cos(i * 2 * Math.PI / 6)), 
						(int) (y0 + radius * Math.sin(i * 2 * Math.PI / 6))); 
 
			g.drawPolygon(p); 
		} 
 
		// 画心型线 
		public void paint_herat(Graphics g) { 
 
			int x0, y0; // 原点坐标 
			x0 = width1 / 2; 
			y0 = height1 / 2; 
			g.drawLine(x0, 0, x0, height1); 
			g.drawLine(0, y0, width1, y0); 
			int i, j = 40, x, y; 
			double pi = 3.14, angle, r; 
 
			while (j < 200) { 
				for (i = 0; i < 1023; i++) { 
					angle = i * pi / 512; 
					r = j * (1 - Math.cos(angle)); 
					x = (int) Math.round(r * Math.cos(angle) * 2); 
					y = (int) Math.round(r * Math.sin(angle)); 
					g.fillOval(x0 + x, y0 + y, 1, 1); 
 
				} 
				j = j + 20; 
			} 
		} 
 
		// 画螺旋线 
		public void paint_luanxuan(Graphics g) { 
 
			int x0, y0; // 原点坐标 
			x0 = width1 / 2; 
			y0 = height1 / 2; 
			// g.drawLine(x0, 0, x0, height1); 
			g.drawLine(0, y0, width1, y0); 
			int i, j = 40, x, y; 
			double pi = 3.14, angle, r; 
 
			while (j < 200) { 
				for (i = 0; i < 1000; i++) { 
					angle = i * pi / 128; 
					r = j * (1 - Math.cos(angle)); 
					x = (int) (r * (Math.cos(angle) + angle * Math.sin(angle))); 
					y = (int) (r * (Math.sin(angle) - angle * Math.cos(angle))); 
					g.fillOval(x0 + x, y0 + y, 1, 2); 
 
				} 
				j = j + 20; 
			} 
		} 
 
		// 单选框的监听函数 
		public void itemStateChanged(ItemEvent e) { // 选中单选按钮时 
 
			if (e.getSource() == cb1) // 判断产生事件对象e的组件是谁 
			{ 
				n = 1; 
				// System.out.println("你按下的是cb1"); 
				repaint(); 
			} 
 
			if (e.getSource() == cb2) // 判断单选按钮cb2的状态 
			{ 
				n = 2; 
				// System.out.println("你按下的是cb2"); 
				repaint(); 
			} 
			if (e.getSource() == cb3) // 判断复选框组cg3选中的是谁 
			{ 
				n = 3; 
				// System.out.println("你按下的是cb3"); 
				repaint(); 
			} 
			if (e.getSource() == cb4) { 
				n = 4; 
				repaint(); 
			} 
 
		} 
 
		public void componentResized(ComponentEvent e) // 改变窗口大小时 
		{ 
			width1 = getWidth(); // 取得窗口的大小 
			height1 = getHeight(); 
			repaint(); 
		} 
 
		public void componentMoved(ComponentEvent arg0) { 
			// TODO 自动生成方法存根 
 
		} 
 
		public void componentShown(ComponentEvent arg0) { 
			// TODO 自动生成方法存根 
 
		} 
 
		public void componentHidden(ComponentEvent arg0) { 
			// TODO 自动生成方法存根 
 
		} 
 
	} 
 
	// 主函数 
	public static void main(String[] args) { 
		// TODO 自动生成方法存根 
		Myhomework jj = new Myhomework(); 
 
	} 
 
}