Programm
Save MyWindowAdapter.java
import java.awt.event.*;
public class MyWindowAdapter extends WindowAdapter
{
public void windowClosing(WindowEvent we)
{
System.exit(0);
}
}
Save MyFrame.java
import java.awt.*;
public class MyFrame extends Frame implements ActionListener, ItemListener, MouseListener, MouseMotionListener
{
MenuBar menubar;
Menu mnuShape, mnuColor;
CheckboxMenuItem itmLine, itmBox, itmOval;
CheckboxMenuItem itmRed, itmGreen, itmBlue, itmMagenta, itmYellow, itmSilver, itmBlack;
MenuItem itmExit;
String currentShape;
Color color;
ArrayList alShape;
int x, y, x1, y1, x2, y2, width, height, oldX, oldY, oldWidth, oldHeight;
MyFrame()
{
super("Mouse Demo");
setSize(800,600);
addWindowListener(new MyWindowAdapter());
addMouseListener(this);
addMouseMotionListener(this);
setResizable(false);
addMenu();
setVisible(true);
currentShape = "line";
color = Color.BLACK;
setCursor(Cursor.CROSSHAIR_CURSOR);
alShape = new ArrayList();
}
private void addMenu()
{
int i;
menubar = new MenuBar();
mnuShape = new Menu("Shape");
itmLine = new CheckboxMenuItem("Line",true);
itmBox = new CheckboxMenuItem("Box",false);
itmOval = new CheckboxMenuItem("Oval",false);
itmLine.addItemListener(this);
itmBox.addItemListener(this);
itmOval.addItemListener(this);
itmLine.setShortcut(new MenuShortcut(KeyEvent.VK_L));
itmBox.setShortcut(new MenuShortcut(KeyEvent.VK_B));
itmOval.setShortcut(new MenuShortcut(KeyEvent.VK_O));
itmExit = new MenuItem("Exit",new MenuShortcut(KeyEvent.VK_X,true));
itmExit.addActionListener(this);
mnuShape.add(itmLine);
mnuShape.add(itmBox);
mnuShape.add(itmOval);
mnuShape.addSeparator();
mnuShape.add(itmExit);
menubar.add(mnuShape);
mnuColor = new Menu("Colour");
itmRed = new CheckboxMenuItem("Red",false);
itmGreen = new CheckboxMenuItem("Green",false);
itmBlue = new CheckboxMenuItem("Blue",false);
itmMagenta = new CheckboxMenuItem("Magenta",false);
itmYellow = new CheckboxMenuItem("Yellow",false);
itmSilver = new CheckboxMenuItem("Silver",false);
itmBlack = new CheckboxMenuItem("Black",true);
itmRed.addItemListener(this);
itmGreen.addItemListener(this);
itmBlue.addItemListener(this);
itmMagenta.addItemListener(this);
itmYellow.addItemListener(this);
itmSilver.addItemListener(this);
itmBlack.addItemListener(this);
mnuColor.add(itmRed);
mnuColor.add(itmGreen);
mnuColor.add(itmBlue);
mnuColor.add(itmYellow);
mnuColor.add(itmMagenta);
mnuColor.add(itmSilver);
mnuColor.add(itmBlack);
menubar.add(mnuColor);
setMenuBar(menubar);
}
private void uncheckAllShapes()
{
itmLine.setState(false);
itmBox.setState(false);
itmOval.setState(false);
}
private void uncheckAllColours()
{
itmRed.setState(false);
itmGreen.setState(false);
itmBlue.setState(false);
itmMagenta.setState(false);
itmYellow.setState(false);
itmSilver.setState(false);
itmBlack.setState(false);
}
public void itemStateChanged(ItemEvent ie)
{
int state = ie.getStateChange();
if (ie.getSource() == itmLine || ie.getSource() ==itmBox || ie.getSource() ==itmOval)
{
uncheckAllShapes();
if (state == 2)
currentShape = "";
else
{
if (ie.getSource() == itmLine)
{
itmLine.setState(true);
currentShape = "line";
}
else if (ie.getSource() == itmBox)
{
itmBox.setState(true);
currentShape = "box";
}
else if (ie.getSource() == itmOval)
{
itmOval.setState(true);
currentShape = "oval";
}
}
if (currentShape.length() == 0)
setCursor(Cursor.DEFAULT_CURSOR);
else
setCursor(Cursor.CROSSHAIR_CURSOR);
}
else
{
uncheckAllColours();
if (ie.getSource() == itmRed)
{
color = Color.RED;
itmMagenta.setState(true);
}
else if (ie.getSource() == itmGreen)
{
color = Color.GREEN;
itmGreen.setState(true);
}
else if (ie.getSource() == itmBlue)
{
color = Color.BLUE;
itmBlue.setState(true);
}
else if (ie.getSource() == itmMagenta)
{
color = Color.MAGENTA;
itmMagenta.setState(true);
}
else if (ie.getSource() == itmYellow)
{
color = Color.YELLOW;
itmYellow.setState(true);
}
else if (ie.getSource() == itmSilver)
{
color = Color.GRAY;
itmSilver.setState(true);
}
else if (ie.getSource() == itmBlack)
{
color = Color.BLACK;
itmSilver.setState(true);
}
}
}
public void actionPerformed(ActionEvent ae)
{
if (ae.getSource() == itmExit)
System.exit(0);
}
//methods in MouseListener interface
public void mouseClicked(MouseEvent me){}
public void mouseEntered(MouseEvent me){/*setBackground(Color.RED);*/}
public void mouseExited(MouseEvent me){/*setBackground(Color.WHITE);*/}
public void mousePressed(MouseEvent me)
{
if (currentShape.equals("line"))
{
if (me.getButton() == MouseEvent.BUTTON1)
{
x1 = me.getX();
y1 = me.getY();
oldX = oldY = -10;
}
}
else if(currentShape.equals("box") || currentShape.equals("oval"))
{
if (me.getButton() == MouseEvent.BUTTON1)
{
x1 = me.getX();
y1 = me.getY();
oldWidth = oldHeight = 0;
}
}
}
public void mouseReleased(MouseEvent me)
{
if (currentShape.equals("line"))
{
x2 = me.getX();
y2 = me.getY();
MyLine ml = new MyLine(x1,y1,x2,y2,color);
alShape.add(ml);
}
else if (currentShape.equals("box"))
{
MyBox mb = new MyBox(x,y,width,height,color);
oldX = oldY = -10;
oldWidth = oldHeight = 0;
alShape.add(mb);
}
else if (currentShape.equals("oval"))
{
MyOval mo = new MyOval(x,y,width,height,color);
oldX = oldY = -10;
oldWidth = oldHeight = 0;
alShape.add(mo);
}
repaint();
}
//methods in MouseMotionListener interface
public void mouseDragged(MouseEvent me)
{
Graphics g;
g = getGraphics();
g.setColor(color);
g.setXORMode(getBackground());
if (currentShape.equals("line"))
{
//first erase the old line
if (oldX != -10 && oldY != -10)
g.drawLine(x1,y1,oldX,oldY);
//draw the new line
x2 = me.getX();
y2 = me.getY();
g.drawLine(x1,y1,x2,y2);
//store the current coordinates
oldX = x2;
oldY = y2;
}
else if (currentShape.equals("box") || currentShape.equals("oval"))
{
x2 = me.getX();
y2 = me.getY();
if (x1 <= x2)
{
width = x2 - x1;
x = x1;
}
else
{
width = x1 - x2;
x = x1 - width;
}
if (y1 <= y2)
{
height = y2 - y1;
y = y1;
}
else
{
height = y1 - y2;
y = y1 - height;
}
//first erase the old box
if (currentShape.equals("box"))
{
if (oldWidth != 0 && oldHeight != 0)
g.drawRect(oldX,oldY,oldWidth,oldHeight);
}
else
{
if (oldWidth != 0 && oldHeight != 0)
g.drawOval(oldX,oldY,oldWidth,oldHeight);
}
//draw the new box
if (currentShape.equals("box"))
g.drawRect(x,y,width,height);
else
g.drawOval(x,y,width,height);
//store the x, y, widht and height
oldX = x;
oldY = y;
oldWidth = width;
oldHeight = height;
}
}
public void mouseMoved(MouseEvent me){}
public void paint(Graphics g)
{
int i;
for (i=0;i<alShape.size();i++)
{
MyShape ms = (MyShape)alShape.get(i);
ms.draw(g);
}
}
}
Save MyShape.java
import java.awt.*;
abstract class MyShape
{
private String shapeName;
private Color color;
MyShape(String shapeName){this.shapeName = shapeName;}
void setShapeName(String shapeName){this.shapeName = shapeName;}
String getShapeName(){return shapeName;}
void setColor(Color color){this.color = color;}
Color getColor(){return color;}
abstract void draw(Graphics g);
}
Save MyOval.java
import java.awt.*;
class MyOval extends MyShape
{
private int x, y, width, height;
MyOval(int x, int y, int width, int height, Color color)
{
super("Oval");
setColor(color);
this.x = x;
this.y = y;
this.width = width;
this.height = height;
}
void draw(Graphics g)
{
Color currentColor = g.getColor();
g.setColor(getColor());
g.drawOval(x,y,width,height);
g.setColor(currentColor);
}
}
Save MyLine.java
import java.awt.*;
class MyLine extends MyShape
{
private int x1, y1, x2, y2;
MyLine(int x1, int y1, int x2, int y2, Color color)
{
super("line");
setColor(color);
this.x1 = x1;
this.y1 = y1;
this.x2 = x2;
this.y2 = y2;
}
void draw(Graphics g)
{
Color currentColor = g.getColor();
g.setColor(getColor());
g.drawLine(x1,y1,x2,y2);
g.setColor(currentColor);
}
}
Save MyBox.java
import java.awt.*;
class MyBox extends MyShape
{
private int x, y, width, height;
MyBox(int x, int y, int width, int height, Color color)
{
super("Box");
setColor(color);
this.x = x;
this.y = y;
this.width = width;
this.height = height;
}
void draw(Graphics g)
{
Color currentColor = g.getColor();
g.setColor(getColor());
g.drawRect(x,y,width,height);
g.setColor(currentColor);
}
}
Save GUI1.java
public class GUI1
{
public static void main(String args[])
{
MyFrame mf = new MyFrame();
}
}
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