2022年JAVA实验报告简单绘图程序

1、实验三 绘制图形一、实验目旳 学会JButton旳使用，能进行JButton旳基本操作,能使用JButton构造一种图形界面框架通过实验熟悉swing图形顾客界面程序设计熟悉java中旳事件解决模型，每个事件动作代表旳意义进一步提高编程能力，学会独立思考，学会上网查找资料决问题。二、实验内容 设计一种程序，该程序可以绘制基本旳图形（涉及圆形、矩形、直线等）；规定有一种简朴易操作旳顾客界面（涉及菜单、按钮等组件）。编写旳程序规定可以实现保存和读取旳功能。三、实验代码Main.javaimport java.awt.BorderLayout;import java.awt.event.Action

2、Listener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JToolBar;import winpaint.WinToolBar;import winpaint.windowsPaint;public class Main /* * param args */public static void main(String args) / TODO Auto-generated method stubJPanel paintWin = new

3、windowsPaint(画图);paintWin.setBounds(0, 30, 1000, 1000);paintWin.setLayout(null);paintWin.setVisible(true);JToolBar tool = new WinToolBar(windowsPaint)paintWin);tool.setBounds(0, 0, 1000, 30);tool.setVisible(true);JFrame frame = new JFrame();frame.setLayout(null);frame.setVisible(true);frame.setBound

4、s(0, 0, 1000, 1000);frame.add(tool);frame.add(paintWin);test.javaimport java.awt.GradientPaint;import java.lang.reflect.Constructor;import base.GrapicsElem;import base.Rect;public class testfractor /* * param args * throws ClassNotFoundException */public static void main(String args) throws ClassNot

5、FoundException / TODO Auto-generated method stubGrapicsElem Ge = new Rect();System.out.println(Ge.getClass().getName(); Class demo1=null; Class demo2=null; Class demo3=null; try /一般尽量采用这种形式 demo1=Class.forName(base.Rect); Class con= demo1.getSuperclass(); System.out.println(con.getName(); demo2 = Cl

6、ass.forName(base.GrapicsElem); Class suns = demo2.getInterfaces(); for (int i = 0; i suns.length; i+) System.out.println(sunsi.getName(); System.out.println(con.length); / GrapicsElem gg = (GrapicsElem)con0.newInstance(); System.out.println(con0); System.out.println(con1); System.out.println(con2);

7、catch(Exception e) e.printStackTrace(); demo2=new Rect().getClass(); demo3=Rect.class; System.out.println(类名称 +demo1.getName(); System.out.println(类名称 +demo2.getName(); System.out.println(类名称 +demo3.getName();GrapicsElem.javapackage base;import java.awt.Color;import java.awt.Graphics;import java.awt

8、.Point;public abstract class GrapicsElem Point start;Point end;private Color color;public Color getColor() return color;public void setColor(Color color) this.color = color;public void setStart(Point start) this.start = start;public void setEnd(Point end) this.end = end;public abstract void doMouseP

9、ress(Point p);public abstract void doMouseDrag(Point p);public abstract void doMouseRelease(Point p);public abstract void draw(Graphics g ) ;Line.javapackage base;import java.awt.Graphics;import java.awt.Point;import java.util.ArrayList;public class Line extends GrapicsElem ArrayList track;public Li

10、ne()track = new ArrayList();Overridepublic void draw(Graphics g) for (int i = 0; i track.size()-1; i+) Point cur = track.get(i);Point next = track.get(i+1);g.drawLine(cur.x, cur.y, next.x, next.y);private void AddPoint(Point p)track.add(p);Overridepublic void doMousePress(Point p) / TODO Auto-genera

11、ted method stubAddPoint(p);Overridepublic void doMouseDrag(Point p) / TODO Auto-generated method stubAddPoint(p);Overridepublic void doMouseRelease(Point p) / TODO Auto-generated method stubAddPoint(p);Rect.javapackage base;import java.awt.Graphics;import java.awt.Point;public class Rect extends Gra

12、picsElem int x,y,width,height;Overridepublic void draw(Graphics g) / TODO Auto-generated method stubg.drawRect(getX(), getY(), getWidth(), getHeight();Overridepublic void doMousePress(Point p) super.setStart(p);super.setEnd(p);Overridepublic void doMouseDrag(Point p) super.setEnd(p);Overridepublic v

13、oid doMouseRelease(Point p) super.setEnd(p);public int getX() return Math.min(start.x, end.x);public int getY() return Math.min(start.y, end.y);public int getWidth() return Math.abs(start.x-end.x);public int getHeight() return Math.abs(start.y-end.y);Circle.javapackage base;import java.awt.Graphics;

14、public class Circle extends Rect Overridepublic void draw(Graphics g) / TODO Auto-generated method stubg.drawOval(getX(), getY(), getWidth(), getHeight();windowsPaint.javapackage winpaint;import java.awt.BasicStroke;import java.awt.Button;import java.awt.Color;import java.awt.Font;import java.awt.Gr

15、aphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.Point;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.MouseEvent;import java.awt.event.MouseListener;import java.awt.event.MouseMotionListener;import java.io.File;import java.io.IOExc

16、eption;import java.nio.Buffer;import java.util.ArrayList;import java.util.BitSet;import java.util.List;import java.awt.geom.*;import java.awt.image.BufferedImage;import javax.imageio.ImageIO;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;i

17、mport javax.swing.JPanel;import javax.swing.JToolBar;import base.Circle;import base.GrapicsElem;import base.Line;import base.Rect;import java.awt.BorderLayout;public class windowsPaint extends JPanelimplements MouseListener, MouseMotionListenerString command = 矩形;List Lg = new ArrayList() ;GrapicsEl

18、em cur;JLabel label;public windowsPaint(String title)init();private void init() addMouseListener(this);addMouseMotionListener(this);/* * 可以使用反射去掉判断语句、 * Class g = Class.forName(base.Rect); * g.newInstance(); * return */private GrapicsElem newInstance()command = WinToolBar.Command;if(command.equals(矩

19、形)return new Rect();else if(command.equals(圆形)return new Circle();else if(command.equals(线)return new Line();return null;Overridepublic void paint(Graphics g) / TODO Auto-generated method stub super.paint(g); Graphics2D g2d = (Graphics2D) g; /g2d.setColor(cur.getColor(); /System.out.println(cur.getC

20、olor(); g2d.setStroke(new BasicStroke(10.0f); for (int i = 0; i Lg.size(); i+) GrapicsElem ge = Lg.get(i); ge.draw(g);/Override/public void repaint() / TODO Auto-generated method stub/ TODO Auto-generated method stub/super.repaint();/ Thread thread = new Thread(new Runnable() /Override/public void r

21、un() / TODO Auto-generated method stub/try /SaveToFile();/ catch (IOException e) / TODO Auto-generated catch block/e.printStackTrace();/);/thread.start();/ImageIcon bg = new ImageIcon(tmp.jpg);/if(bg!=null)/if(label!=null)/this.remove(label);/ label = new JLabel(bg); / label.setBounds(0,0,bg.getIcon

22、Width(),bg.getIconHeight();/ this.add(label);/ super.repaint();/ /private void SaveToFile() throws IOException / TODO Auto-generated method stubBufferedImage bimg = new BufferedImage(this.getWidth(), this.getHeight(), BufferedImage.TYPE_3BYTE_BGR);Graphics2D g2d = bimg.createGraphics();this.paint(g2

23、d);ImageIO.write(bimg, jpg, new File(tmp.jpg);Overridepublic void mousePressed(MouseEvent e) Point p = new Point(e.getX(),e.getY();cur = newInstance();cur.doMousePress(p);Lg.add(cur);Overridepublic void mouseDragged(MouseEvent e) Point p = new Point(e.getX(),e.getY();cur.doMouseDrag(p);repaint();Ove

24、rridepublic void mouseReleased(MouseEvent e) Point p = new Point(e.getX(),e.getY();cur.doMouseRelease(p);repaint();Overridepublic void mouseMoved(MouseEvent e) / TODO Auto-generated method stubOverridepublic void mouseClicked(MouseEvent e) / TODO Auto-generated method stubOverridepublic void mouseEn

25、tered(MouseEvent e) / TODO Auto-generated method stubOverridepublic void mouseExited(MouseEvent e) / TODO Auto-generated method stubWinToolBar.javapackage winpaint;import java.awt.Color;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.ItemEvent;import java

26、.awt.event.ItemListener;import javax.swing.JButton;import javax.swing.JComboBox;import javax.swing.JSeparator;import javax.swing.JToolBar;public class WinToolBar extends JToolBar implements ActionListenerpublic static String Command = 矩形;JButton btn1,btn2,btn3;/windowsPaint winp;public WinToolBar(windowsPaint winP )btn1 = new JButton(矩形);btn2 = new JButton(圆形);btn3 = new J