java applet 画图板-JSP教程,Java技巧及代码

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

public class huatu implements mousemotionlistener,actionlistener{

static final int r=3;

static int ox, oy;

static int flag=1;

public static void main(string arg[]){

jframe f=new jframe("paint");

container p=f.getcontentpane();

p.setlayout(new flowlayout());

jbutton jbutton1 = new jbutton("红");

jbutton jbutton2 = new jbutton("黑");

jbutton jbutton3 = new jbutton("退出");

//graphics g.setcolor(new color(255,0,0));

//buttonevent arg=new buttonevent(arg);

jbutton1.addactionlistener(new huatu());

jbutton2.addactionlistener(new huatu());

jbutton3.addactionlistener(new huatu());

p.addmousemotionlistener(new huatu());

p.add(jbutton1);

p.add(jbutton2);

p.add(jbutton3);

f.setsize(200,200);

f.show();

}

public void actionperformed(actionevent e){

if(e.getactioncommand().equals("红")){

flag=1;

}

else if (e.getactioncommand().equals("黑")){

flag=2;

}

else if (e.getactioncommand().equals("退出"))

system.exit(0);

}

public void mousedragged(mouseevent e){

container c=(container)e.getsource();

graphics g=c.getgraphics();

if (ox>=0) {

if(flag==1){

g.setcolor(new color(168,0,255));

g.drawline(ox,oy,e.getx(),e.gety());}

else

{ g.setcolor(new color(0,0,0));

g.drawline(ox,oy,e.getx(),e.gety());}

}

ox=e.getx();oy=e.gety();

}

public void mousemoved(mouseevent e){

ox=-1;oy=-1;

}

}