JAVA实验报告——简单绘图程序

1、实验三绘制图形一、实验目的学会JButton的使用，能进行JButton的基本操作，能使用JButton构造一个图形界面 框架通过实验熟悉 swing图形用户界面程序设计熟悉java中的事件处理模型，每个事件动作代表的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、实验内容设计一个程序，该程序能够绘制基本的图形（包括圆形、矩形、直线等）；要求有一 个简单易操作的用户界面（包括菜单、按钮等组件）。编写的程序要求能够实现保存和读取 的功能。三、实验代码Main.javaimport import import import importjava.awt.BorderLayout;

2、java.awt.event.ActionListener;javax.swing.JButton;javax.swing.JFrame;javax.swing.JPanel;import import importpublic/*javax.swing.JToolBar;winpaint.WinToolBar;winpaint.windowsPaint; class Main param args*/public static void main(String口 args) / TODOAuto-generated method stubJPanel paintWin =new window

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

4、me.setBounds(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 argsthrows ClassNotFoundException*/public static void main(String口 args) throws Cla

5、ssNotFoundException / TODOAuto-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();

6、System.out.println(con.getName();demo2 = Class.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.pri

7、ntln(con0);System.out.println(con1);System.out.println(con2);catch(Exception e) e.printStackTrace();demo2=new Rect().getClass();demo3=Rect.class;System.out.println("System.out.println("System.out.println("类名称类名称类名称"+demo1.getName();"+demo2.getName();"+demo3.getName();Gr

8、apicsElem.javapackage base;import java.awt.Color;import java.awt.Graphics;import java.awt.Point;publicabstract class GrapicsElem Point start ;Point end;private Color color ;public Color getColor() return color ;public void setColor(Color color) this . color = color; publicthisvoid setStart(Point sta

9、rt) .start = start;public void setEnd(Point end) this . end = end; publicabstractvoiddoMousePress(Point p);publicabstractvoiddoMouseDrag(Point p);publicabstractvoiddoMouseRelease(Point p);publicabstractvoiddraw(Graphics g );Line.java package base; import java.awt.Graphics; import java.awt.Point; imp

10、ort java.util.ArrayList;public class Line extends GrapicsElem ArrayList<Point> track ;public Line()track = new ArrayList<Point>();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

11、. y, next. x, next. y); private void AddPoint(Point p) track .add(p); Override publicvoid doMousePress(Point p) / TODOAuto-generated method stub AddPoint(p); Override public void doMouseDrag(Point p) / TODOAuto-generated method stub AddPoint(p); Override publicvoid doMouseRelease(Point p) / TODOAuto

12、-generated method stub AddPoint(p); Rect.java package base; import java.awt.Graphics; import java.awt.Point; public class Rect extends GrapicsElem int x, y, width , height ;Override public void draw(Graphics g) / TODOAuto-generated method stub g.drawRect(getX(), getY(), getWidth(), getHeight(); Over

13、ride public void doMousePress(Point p) super .setStart(p); super .setEnd(p); Override public void doMouseDrag(Point p) super .setEnd(p); Override public void 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

14、.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;public class Circle extends Rect Overridepublic void draw(Graphics g) / TODOAuto-generated method stub g.drawOval(getX(), getY(), getW

15、idth(), getHeight();windowsPaint.javapackage winpaint;import java.awt.BasicStroke;import java.awt.Button;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.Point;import java.awt.event.ActionEvent;import java.awt.event.

16、ActionListener;import java.awt.event.MouseEvent;import java.awt.event.MouseListener;import java.awt.event.MouseMotionListener;import java.io.File;import java.io.IOException;import java.nio.Buffer;import java.util.ArrayList;import java.util.BitSet;import java.util.List;import java.awt.geom.*;import j

17、ava.awt.image.Bufferedlmage;import javax.imageio.ImagelO;import javax.swing.Imagelcon;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JToolBar;import base.Circle;import base.GrapicsElem;import base.Line;import base.Rect;impo

18、rt java.awt.BorderLayout;public class windowsPaint extends JPanelimplements MouseListener, MouseMotionListener String command ="矩形"List<GrapicsElem> Lg = new ArrayList();GrapicsElem cur;JLabel label;public windowsPaint(String title) init();private void init() addMouseListener(this);/

19、*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("矩形")return new Rect();else if(command.equals("圆形")return new Circle();

20、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.setC010r(cur.getColor();System.out.println(cur.getColor();g2d.setStroke(new BasicStroke(10.0f);for (int i = 0

21、;i< Lg.size(); i+) GrapicsElem ge = Lg.get(i); ge.draw(g);Overridepublic void repaint() / TODO Auto-generated method stub/ TODO Auto-generated method stub/ IlliIlli Illi / / / / / / / / / / / super.repaint();Thread thread = new Thread(new Runnable() Override public void run() / TODO Auto-generate

22、d method stub trySaveToFile(); catch (lOException 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.geticonWidth(),bg.getIconHei

23、ght();/this.add(label);/super.repaint();/private void SaveToFile() throws lOException / TODO Auto-generated method stubBufferedImage bimg = new BufferedImage(this.getWidth(),this.getHeight(), BufferedImage.TYPE_3BYTE_BGR);Graphics2D g2d = bimg.createGraphics();this.paint(g2d);ImageIO.write(bimg, &qu

24、ot;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();Over

25、ridepublic 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

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

27、va.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 ActionListener public 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 JButton("线")；this.add(btn1);this.add(btn2);