II 12, JFileChooser. , 2. SolidEllipse ( 2), PolyLine.java ( 3). Draw.java

Size: px

Start display at page:

Download "II 12, JFileChooser. , 2. SolidEllipse ( 2), PolyLine.java ( 3). Draw.java"

Barrie Gregory
5 years ago
Views:

1 II 12, , 17 2 : 1 2, JFileChooser, 2,,, Draw 1, SolidEllipse ( 2), PolyLinejava ( 3) 1 Drawjava 2 import javaxswing*; 3 import javaawtevent*; import javautil*; 5 import javaio*; 6 7 public class Draw extends JFrame { 8 public Draw() { 9 factory = factories [0]; 10 figs = new FigureList(); 11 } public static void main(string[] args) { 1 Draw app = new Draw(); 15 appsetmenu(); 16 appsetsize(500, 00); 17 app setvisible(true); 18 app setdefaultcloseoperation( DISPOSE_ON_CLOSE); TheMouseListener listener = appnew TheMouseListener (); 21 app addmouselistener(listener); 22 app addmousemotionlistener(listener); 23 app addwindowlistener(appnew TheWindowListener ()); 2 } void setmenu() { 27 JMenuBar mb = new JMenuBar(); 28 addfilemenu(mb); 29 addeditmenu(mb); 30 setjmenubar(mb); 31 } 32 1

2 33 void addfilemenu( JMenuBar mb) { 3 JMenu mn = new JMenu("File"); addmenuitem(mn, "Save", new SaveFileHandler ()); 37 addmenuitem(mn, "Load", new LoadFileHandler ()); mn addseparator (); 0 addmenuitem(mn, "Exit", new ExitHandler ()); 1 2 mbadd(mn); 3 } 5 void addeditmenu( JMenuBar mb) { 6 JMenu mn = new JMenu("Edit"); 7 8 for (int i = 0; i < factorieslength; ++i) { 9 JRadioButtonMenuItem item = 50 new JRadioButtonMenuItem( factories[i] name(), i == 0); 51 mnadd(item); 52 item addactionlistener(new FigureItemHandler( factories[i])); 53 figurebuttonsadd(item); 5 } mn addseparator (); 57 addmenuitem(mn, "Undo", null); mbadd(mn); 60 } void addmenuitem(jmenu mn, String title, ActionListener listener) { 63 JMenuItem item = new JMenuItem(title); 6 mnadd(item); 65 if (listener!= null) { 66 item addactionlistener(listener); 67 } 68 } public void paint(graphics g) { 71 superpaint(g); 72 figsdraw(g); 73 } 7 75 FigureList figs; 76 Figure prevfig = FigureFactory nullfigure; 77 ButtonGroup figurebuttons = new ButtonGroup (); 78 JFileChooser fc = new JFileChooser(); class FigureItemHandler implements ActionListener { 81 public FigureItemHandler(FigureFactory factory) { 82 thefactory = factory; 83 } 8 85 public void actionperformed( ActionEvent e) { 86 factory = thefactory; 87 repaint(); 88 } FigureFactory thefactory; 91 }; class TheWindowListener extends WindowAdapter { 9 public void windowclosing( WindowEvent e) { 95 Systemexit(0); 96 } 97 }; class ExitHandler implements ActionListener { 100 public void actionperformed( ActionEvent e) { 101 Systemexit(0); 102 } 103 }; class TheMouseListener extends MouseAdapter implements MouseMotionListener { 106 public void mousepressed( MouseEvent e) { 107 if (e getclickcount() == 1) { 2

3 108 factoryaddpoint(egetpoint ()); 109 } else { 110 factory terminate(); 111 } if (factory iscompleted()) { 11 Graphics g = getgraphics (); 115 prevfigdraw(g); 116 Figure newfig = factorygenerate(); 117 if (newfig!= FigureFactory nullfigure) { 118 figs addfigure(newfig); 119 } 120 prevfig = FigureFactory nullfigure; 121 repaint(); 122 } 123 } public void mousedragged( MouseEvent e) { } public void mousemoved( MouseEvent e) { 128 Graphics g = getgraphics(); 129 prevfigdraw(g); 130 factory addtmppoint(egetpoint ()); 131 prevfig = factory tmpgenerate (); 132 prevfigdraw(g); 133 } public void mousereleased( MouseEvent e) { } 136 }; FigureFactory factory; FigureFactory[] factories = { 11 Line getfactory(), 12 Box getfactory(), 13 PolyLine getfactory(), 1 SolidEllipse getfactory(), 15 }; class LoadFileHandler implements ActionListener { 18 public void actionperformed( ActionEvent e) { 19 repaint(); 150 int retval = fc showopendialog(null); 151 if (retval == JFileChooser APPROVE_OPTION) { 152 File f = fc getselectedfile (); 153 try { 15 FileInputStream istream = new FileInputStream(f); 155 ObjectInputStream p = new ObjectInputStream(istream); figs = ( FigureList)p readobject(); 158 istreamclose(); 159 } 160 catch ( FileNotFoundException ex) { 161 Systemoutprintln(" FileNotFoundException"); 162 } 163 catch ( ClassNotFoundException ex) { 16 Systemoutprintln(" ClassNotFoundException"); 165 } 166 catch ( IOException ex) { 167 Systemoutprintln(" IOException"); 168 } 169 finally { 170 repaint(); 171 } 172 } 173 } 17 }; class SaveFileHandler implements ActionListener { 177 public void actionperformed( ActionEvent e) { 178 repaint(); 179 int retval = fc showsavedialog(null); 180 if (retval == JFileChooser APPROVE_OPTION) { 181 File f = fc getselectedfile (); 182 try { 3

4 183 FileOutputStream ostream = new FileOutputStream(f); 18 ObjectOutputStream p = new ObjectOutputStream(ostream); p writeobject(figs); 187 pflush(); 188 ostreamclose(); 189 } 190 catch ( FileNotFoundException ex) { 191 Systemoutprintln(" FileNotFoundException"); 192 } 193 catch ( IOException ex) { 19 Systemoutprintln(" IOException"); 195 } 196 } 197 } 198 }; 199 }; 2 SolidEllipsejava 2 import javalang*; 3 import javalang*; 5 public class SolidEllipse extends Rectangular { 6 public SolidEllipse(Point p, Point q) { 7 super(p, q); 8 } 9 10 public void draw(graphics g) { 11 gfilloval(lt()x, lt()y, width(), height()); 12 } 13 1 public static FigureFactory getfactory() { 15 return factory; 16 } static Factory factory = new Factory(); static class Factory extends RectangularFactory { 21 protected Factory() { } 22 public String name() { return " SolidEllipse"; } protected Figure gen() { 26 if (iscompleted()) { 27 return new SolidEllipse(p(), q()); 28 } else { 29 return nullfigure; 30 } 31 } 32 }; 33 }; 3 PolyLinejava 2 import javalang*; 3 import javautil*; 5 public class PolyLine extends Figure { 6 PolyLine( ArrayList points) { 7 thispoints = new Point[pointssize()]; 8 for (int i = 0; i < pointssize(); ++i) { 9 thispoints[i] = (Point)pointsget(i); 10 } 11 } public void draw(graphics g) { 1 Point p = points[0]; 15 for (int i = 1; i < pointslength; ++i) { 16 Point q = points[i]; 17 gdrawline(px, py, qx, qy); 18 p = q;

5 19 } 20 } public void move(point vec) { 23 for (int i = 0; i < pointslength; ++i) { 2 points[i] = movepoint(points[i], vec); 25 } 26 } public static FigureFactory getfactory() { 29 return factory; 30 } Point[] points; 33 static Factory factory = new Factory(); 3 35 static class Factory extends FigureFactory { 36 protected Factory() { } 37 public String name() { return "PolyLine"; } public void addpoint(point p) { 0 if (npoints == 0) { 1 pointsadd(new Point(p)); 2 npoints = 1; 3 } else { pointsset(npoints -1, new Point(p)); 5 } 6 ++npoints; 7 pointsadd(null); 8 } 9 50 public void addtmppoint(point p) { 51 if (npoints > 0) { 52 pointsset(npoints -1, new Point(p)); 53 } 5 } public boolean iscompleted() { return completed; } protected Figure gen() { 59 if (npoints >= 2) { 60 if (pointsget(npoints -1) == null) { 61 pointsremove(npoints -1); 62 } 63 return new PolyLine(points); 6 } else { 65 return nullfigure; 66 } 67 } public void clear() { 70 pointsclear(); 71 npoints = 0; 72 completed = false; 73 } 7 75 public void terminate() { 76 completed = true; 77 } static ArrayList points = new ArrayList(); 80 static boolean completed = false; 81 static int npoints = 0; 82 }; 83 }; 5

Method Of Key Event Key Listener must implement three methods, keypressed(), keyreleased() & keytyped(). 1) keypressed() : will run whenever a key is

Method Of Key Event Key Listener must implement three methods, keypressed(), keyreleased() & keytyped(). 1) keypressed() : will run whenever a key is INDEX Event Handling. Key Event. Methods Of Key Event. Example Of Key Event. Mouse Event. Method Of Mouse Event. Mouse Motion Listener. Example of Mouse Event. Event Handling One of the key concept in