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* 日历程序
[1999-12-28 08:20] |
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彩色画图本
/*
该Java程序是一个简单的彩色画图本
语言：Java
运行平台：Unix, Windows
*/
import java.applet.*;
import java.awt.*;
import java.util.*;
public class colorbook extends Applet
{
private Color current_color=Color.black;
private Button clear_button;
private Choice picture_choices;
private Image image;
private CheckboxGroup cbgroup;
public void init()
{
Color background = Color.white;
clear_button = new Button("Clear");
clear_button.setForeground(Color.black);
add(clear_button);
cbgroup = new CheckboxGroup();
Checkbox b;
add(b = new Checkbox(null, cbgroup, true));
b.setBackground(background);
add(b = new Checkbox(null, cbgroup, false));
b.setBackground(Color.black);
add(b = new Checkbox(null, cbgroup, false));
b.setBackground(Color.red);
add(b = new Checkbox(null, cbgroup, false));
b.setBackground(Color.yellow);
add(b = new Checkbox(null, cbgroup, false));
b.setBackground(Color.green);
add(b = new Checkbox(null, cbgroup, false));
b.setBackground(Color.blue);
add(b = new Checkbox(null, cbgroup, true));
b.setBackground(Color.lightGray);
current_color=b.getBackground();
picture_choices = new Choice();
picture_choices.addItem("Page 1");
picture_choices.addItem("Page 2");
picture_choices.addItem("Page 3");
picture_choices.addItem("Page 4");
picture_choices.addItem("Page 5");
picture_choices.addItem("Page 6");
picture_choices.addItem("Page 7");
picture_choices.addItem("Page 8");
picture_choices.addItem("Page 9");
picture_choices.setForeground(Color.black);
picture_choices.setBackground(Color.lightGray);
add(new Label("Pictures"));
add(picture_choices);
setBackground(background);
image = getImage(getDocumentBase(), "page1.gif");
}
public static void main(String args[])
{
Frame f = new Frame("Coloring Book");
colorbook colorbook_object = new colorbook();
colorbook_object.init();
colorbook_object.start();
f.add("Center", colorbook_object);
f.resize(400, 400);
f.show();
}
public boolean mouseDown(Event e, int x, int y)
{
mouseDrag(e,x,y);
return true;
}
public boolean mouseDrag(Event e, int x, int y)
{
if (e.y > 50)
{
Graphics g = this.getGraphics();
g.setColor(current_color);
g.fillOval(e.x, e.y, 12, 12);
update(getGraphics());;
}
return true;
}
public boolean action(Event e, Object arg)
{
if (e.id == Event.WINDOW_DESTROY)
{
System.exit(0);
}
else if (e.target instanceof Checkbox)
{
current_color = ((Component)e.target).getBackground();
setForeground(current_color);
}
else if (e.target instanceof Choice)
{
String choice = (String)arg;
if(arg.equals("Page 1")) image = getImage(getDocumentBase(),"page1.gif");
else if(arg.equals("Page 2")) image = getImage(getDocumentBase(),"page2.gif");
else if(arg.equals("Page 3")) image = getImage(getDocumentBase(),"page3.gif");
else if(arg.equals("Page 4")) image = getImage(getDocumentBase(),"page4.gif");
else if(arg.equals("Page 5")) image = getImage(getDocumentBase(),"page5.gif");
else if(arg.equals("Page 6")) image = getImage(getDocumentBase(),"page6.gif");
else if(arg.equals("Page 7")) image = getImage(getDocumentBase(),"page7.gif");
else if(arg.equals("Page 8")) image = getImage(getDocumentBase(),"page8.gif");
else if(arg.equals("Page 9")) image = getImage(getDocumentBase(),"page9.gif");
clear();
}
else if (e.target == clear_button)
{
clear();
}
else
{
return super.action(e,arg);
}
return true;
}
public void update(Graphics g)
{
Graphics offScreenGraphics = g.create();
paint(offScreenGraphics);
g = offScreenGraphics.create();
}
public void clear()
{
Graphics g = getGraphics();
Color fg = getForeground();
g.setColor(getBackground());
g.fillRect(0,0, size().width, size().height);
g.setColor(fg);
paint(g);
}
public void paint(Graphics g)
{
g.drawImage(image,0,50,this);
}
}
（作者： 1999年12月28日 08:20）
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