yhjpainter.java

模仿windows图画版 java语言编写

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.MouseMotionListener;
import java.util.ArrayList;
import java.util.List;

import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;

//import javax.swing.Component;

public class YhjPainter extends JFrame implements ActionListener, MouseListener, MouseMotionListener {
	int x, y, x1, y1, x2, y2, width, height;

	boolean isFirstPoint = true;

	// 初始化开始画的是线
	int drawType = PaintingGround.LINE;

	// 添加控件
	ButtonGroup btg = new ButtonGroup();

	Button btLine = new Button("线");

	Button btRectangle = new Button("矩形");

	Button btRound = new Button("圆");

	Button btEllipse = new Button("椭圆");

	Panel buttonPanel = new Panel();

	PaintingGround paintingGround = new PaintingGround();

	// Main Method
	public static void main(String[] args) {
		// 设置显示外观
		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
		} catch (Exception e) {
			e.printStackTrace();
		}
		new YhjPainter();
	}

	// 构造函数
	public YhjPainter() {
		// 控件添加到控件组中
		// btg.add(btLine);
		// btg.add(btRectangle);
		// btg.add(btRound);
		// btg.add(btEllipse);
		buttonPanel.add(btLine);
		buttonPanel.add(btRectangle);
		buttonPanel.add(btRound);
		buttonPanel.add(btEllipse);

		// 设置容器及容器的整体布局
		Container cp = this;

		cp.setLayout(new BorderLayout());

		cp.add(BorderLayout.NORTH, buttonPanel);
		cp.add(BorderLayout.CENTER, paintingGround);
		// cp.add(BorderLayout.SOUTH,jf);
		// jf.setJMenuBar(mb);
		setLocation(300, 150);
		setSize(600, 480);
		setVisible(true);

		setDefaultCloseOperation(EXIT_ON_CLOSE);
		// 添加鼠标触发事件
		paintingGround.addMouseListener(new MouseAdapter() {
			public void mouseReleased(MouseEvent evn) {
				isFirstPoint = true;
				switch (drawType) {
				case PaintingGround.LINE:
					// 画线
					Line line = new Line(x1, y1, x2, y2);
					paintingGround.add(line);
					break;
				case PaintingGround.RECTANGLE:
					// 画矩形
					Rect rect = new Rect(x1, y1, x2 - x1, y2 - y1);
					paintingGround.add(rect);
					break;
				case PaintingGround.ROUND:
					// 画圆
					// 两点距离公式
					int size = Math.abs((int) Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1)));
					Round round = new Round(x1, y1, size);
					paintingGround.add(round);
					break;
				case PaintingGround.ELLIPSE:
					// 画椭圆
					Ellipse ellipse = new Ellipse(x1, y1, x2 - x1, y2 - y1);
					paintingGround.add(ellipse);
					break;
				default:
					break;
				}
			}
		});
		// 对鼠标的输入进行判断并调用画图程序
		paintingGround.addMouseMotionListener(new MouseMotionAdapter() {
			public void mouseDragged(MouseEvent evn) {
				if (isFirstPoint) {
					x1 = evn.getX();
					y1 = evn.getY();
					isFirstPoint = false;
				} else {
					x2 = evn.getX();
					y2 = evn.getY();
					switch (drawType) {
					case PaintingGround.LINE:
						// 画线
						Line line = new Line(x1, y1, x2, y2);
						paintingGround.setNowObj(line);
						break;
					case PaintingGround.RECTANGLE:
						// 画矩形
						Rect rect = new Rect(x1, y1, x2 - x1, y2 - y1);
						paintingGround.setNowObj(rect);
						break;
					case PaintingGround.ROUND:
						// 画圆
						// 两点距离公式
						int size = Math.abs((int) Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1)));
						Round round = new Round(x1, y1, size);
						paintingGround.setNowObj(round);
						break;
					case PaintingGround.ELLIPSE:
						// 画椭圆
						Ellipse ellipse = new Ellipse(x1, y1, x2 - x1, y2 - y1);
						paintingGround.setNowObj(ellipse);
						break;
					default:
						break;
					}
					repaint();
				}
			}
		});
		// 各个控件的触发事件
		btLine.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent evn) {
				drawType = PaintingGround.LINE;
			}
		});

		btRectangle.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent evn) {
				drawType = PaintingGround.RECTANGLE;
			}
		});

		btRound.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent evn) {
				drawType = PaintingGround.ROUND;
			}
		});

		btEllipse.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent evn) {
				drawType = PaintingGround.ELLIPSE;
			}
		});

	}

	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub

	}

	public void mouseClicked(MouseEvent e) {
		// TODO Auto-generated method stub

	}

	public void mousePressed(MouseEvent e) {
		// TODO Auto-generated method stub

	}

	public void mouseReleased(MouseEvent e) {
		// TODO Auto-generated method stub

	}

	public void mouseEntered(MouseEvent e) {
		// TODO Auto-generated method stub

	}

	public void mouseExited(MouseEvent e) {
		// TODO Auto-generated method stub

	}

	public void mouseDragged(MouseEvent e) {
		// TODO Auto-generated method stub

	}

	public void mouseMoved(MouseEvent e) {
		// TODO Auto-generated method stub

	}
}

class PaintingGround extends JPanel {
	public static final int LINE = 1;

	public static final int RECTANGLE = 2;

	public static final int ROUND = 3;

	public static final int ELLIPSE = 4;

	private int x, y;

	private int x1, y1, x2, y2;

	private int width, height, size;

	private int drawType = 0;

	private boolean isFill = false;

	private List list = new ArrayList();

	private Object nowObj=null;
	// 构造函数
	public PaintingGround() {
		setBackground(Color.white);
	}

	// 判断是用实心还是空心的,
	public void paint(Graphics g) {
		super.paint(g);
		g.setColor(Color.black);
		System.out.println("size="+list.size());
		for (int i = 0; i < list.size(); i++) {
			Object obj = list.get(i);
			drawPic(obj,g);
		}
		drawPic(nowObj,g);

	}
	private void drawPic(Object obj,Graphics g){
		if(obj==null)
			return ;
		if (obj instanceof Line) {
			Line line = (Line) obj;
			g.drawLine(line.x1, line.y1, line.x2, line.y2);
		} else if (obj instanceof Rect) {
			Rect rect = (Rect) obj;
			g.drawRect(rect.x1, rect.y1, rect.width, rect.height);
		} else if (obj instanceof Round) {
			Round round = (Round) obj;
			g.drawOval(round.x, round.y, round.size, round.size);
		} else if (obj instanceof Ellipse) {
			Ellipse ellipse = (Ellipse) obj;
			g.drawOval(ellipse.x, ellipse.y, ellipse.width, ellipse.height);
		}
	}

	public void setFillState(boolean isFill) {
		this.isFill = isFill;
	}

	public void add(Object obj) {
		list.add(obj);
	}
	public void setNowObj(Object obj)
	{
		this.nowObj=obj;
	}
}

class Line {
	public int x1;

	public int x2;

	public int y1;

	public int y2;

	Line(int x1, int y1, int x2, int y2) {
		this.x1 = x1;
		this.y1 = y1;
		this.x2 = x2;
		this.y2 = y2;
	}
}

class Rect {
	public int x1;

	public int y1;

	public int width;

	public int height;

	Rect(int x1, int y1, int width, int height) {
		this.x1 = x1;
		this.y1 = y1;
		this.width = width;
		this.height = height;
	}
}

class Round {
	public int x;

	public int y;

	public int size;

	Round(int x, int y, int size) {
		this.x = x;
		this.y = y;
		this.size = size;
	}
}

class Ellipse {
	public int x;

	public int y;

	public int width;

	public int height;

	Ellipse(int x, int y, int width, int height) {
		this.x = x;
		this.y = y;
		this.width = width;
		this.height = height;
	}
}